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< Page ,Total 38 >
Investigation of transient flow characteristics inside a centrifugal compressor for design and off-design conditions EI SCIE Scopus
期刊论文 | 2018 , 232 (4) , 364-385 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY
SCOPUS Cited Count: 1
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Abstract :

As the flow rate decreases from the design to the rotating stall condition, the enhanced impeller-diffuser interaction considerably deteriorates the flow condition at the diffuser inlet, which may trigger stall and blade vibration problems. In order to reveal the underlying mechanism and estimate the impact of the interaction within the impeller and diffuser passages, measurements using the wireless acquisition technique and high-frequency response system have been conducted on a 1.5 stage centrifugal compressor with the vaned diffuser. The details of its transient flow characteristics suggest that the effects of the impeller sweep extensively propagate in the diffuser passage. Distinctions of the shroud reversed vortex effect exist between the main and splitter blades at the impeller outlet, which initiates the predominant passage passing frequency at the diffuser inlet under small flow rate condition. In addition, the present study explains why the dominant disturbance shifts back and force between the passage passing frequency and blade passing frequency for different positions of the diffuser and flow rates. Through flow throttling, the diffuser reaction toward the impeller passage considerably strengthens due to the growing pressure potential near the convex surface of the diffuser vane, which is associated with the reversed flow.

Keyword :

rotor-stator effect transient Advanced measurement compressor aerodynamics centrifugal compressors

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GB/T 7714 Zhao, Jiayi , Wang, Zhiheng , Zhao, Yang et al. Investigation of transient flow characteristics inside a centrifugal compressor for design and off-design conditions [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (4) : 364-385 .
MLA Zhao, Jiayi et al. "Investigation of transient flow characteristics inside a centrifugal compressor for design and off-design conditions" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY 232 . 4 (2018) : 364-385 .
APA Zhao, Jiayi , Wang, Zhiheng , Zhao, Yang , Xi, Guang . Investigation of transient flow characteristics inside a centrifugal compressor for design and off-design conditions . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY , 2018 , 232 (4) , 364-385 .
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Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (1) , 33-45 | Tuijin Jishu/Journal of Propulsion Technology
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Abstract :

To investigate the effect of endwall synthetic jet(SJ) on vortex structure and flow loss reduction in a high-loaded turbine cascade, unsteady numerical model of Durham cascade with SJ installed at the endwall upstream of the blade was established. A series of simulations were performed to determine beneficial excitation parameters. At the optimal excitation parameters, the influence of SJ on vortex structure and flow loss were investigated in detail and the association between them was focused on. The results indicated that the sizes of the horseshoe vortex and passage vortex were reduced; the transverse vortex originated from adjacent pressure surface were weakened; the corner vortex was slightly strengthened; the wall vortex was receded indirectly. Total pressure loss coefficient was decreased by 10.72% at the optimal excitation parameters when dimensionless excitation amplitude and frequency were 0.073 and 1, respectively. From the perspective of control mechanism, SJ enhanced the mixing of main fluid and boundary-layer fluid downstream of the jet, the momentum of boundary-layer fluid increased, so that the horseshoe vortex was weakened. SJ influenced the boundary separation at the pressure face of the blade, the region and position of low-energy fluid caused by boundary separation were changed, so that the transverse vortex was weakened. Flow loss was reduced as a result of weakened vortexes. © 2018, Editorial Department of Journal of Propulsion Technology. All right reserved.

Keyword :

Active flow control Excitation parameters Flow loss Synthetic jets Vortex structures

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GB/T 7714 Yu, Hong-Shi , Wang, Zhi-Heng , Xi, Guang . Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade [J]. | Tuijin Jishu/Journal of Propulsion Technology , 2018 , 39 (1) : 33-45 .
MLA Yu, Hong-Shi et al. "Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade" . | Tuijin Jishu/Journal of Propulsion Technology 39 . 1 (2018) : 33-45 .
APA Yu, Hong-Shi , Wang, Zhi-Heng , Xi, Guang . Numerical Investigation on Effects of Endwall Synthetic Jet on Vortex and Flow Losses in a High-Loaded Turbine Cascade . | Tuijin Jishu/Journal of Propulsion Technology , 2018 , 39 (1) , 33-45 .
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Experimental Study of Tip Clearance Effects on Performance and Flow Field of a Centrifugal Compressor EI
期刊论文 | 2018 , 39 (7) , 1453-1460 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

In this paper, the experiment is carried out to study the effects of tip clearance on overall performance and flow field of a centrifugal compressor, and the operating tip clearance sizes of the impeller are measured by the Non-contact optical fiber displacement sensors. The results shows that, the operating tip clearance sizes fluctuate as time, the averaged operating tip clearance is smaller than the cold one. The pressure ratio and efficiency of centrifugal compressor decrease as the tip clearance increases, and the effects are more obvious with higher rotation speed. At the same time, the analysis of flow field indicates that, the influencing zone of tip clearance flow move upstream as the flow rate decreases. An increased tip clearance expands the influencing zone of tip clearance flow and increases the pressure loss. © 2018, Science Press. All right reserved.

Keyword :

Optical fiber displacement Pressure ratio Rotation speed Static pressure Tip clearance Tip clearance effects Tip clearance flow Tip clearance sizes

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GB/T 7714 Zhao, Hui-Jing , Xi, Guang , Duan, Ya-Fei et al. Experimental Study of Tip Clearance Effects on Performance and Flow Field of a Centrifugal Compressor [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (7) : 1453-1460 .
MLA Zhao, Hui-Jing et al. "Experimental Study of Tip Clearance Effects on Performance and Flow Field of a Centrifugal Compressor" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 7 (2018) : 1453-1460 .
APA Zhao, Hui-Jing , Xi, Guang , Duan, Ya-Fei , Wang, Zhi-Heng . Experimental Study of Tip Clearance Effects on Performance and Flow Field of a Centrifugal Compressor . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (7) , 1453-1460 .
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Numerical Investigations on Inuence of Volute Non-Axisymmetry on Unsteady Flow in Centrifugal Compressor EI
期刊论文 | 2018 , 39 (11) , 2412-2419 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

The influence of volute non-axisymmetry on the unsteady flow in a centrifugal compressor is investigated by the unsteady numerical simulation. The results indicate that, the flow unsteady uctuation in the centrifugal compressor is dominated by the impeller. The inuence of volute non-axisymmetry can be propagated to the leading edge of impeller when the volute is operated away from its design condition. The influence of the non-axisymmetric structure of volute on the instantaneous pressure at the pressure surface of diffuser vane is mainly on the main and splitter blades passing frequency at the low and design flow rates, while the impeller shaft rotating frequency also plays an important role under the large flow rate condition. The pressure uctuation on the pressure surface of impeller main blade is mainly affected by the impeller shaft rotation frequency, the diffuser blade passing frequency and their multiple frequencies. © 2018, Science Press. All right reserved.

Keyword :

Axisymmetric structure Axisymmetry Instantaneous pressures Multiple frequency Numerical investigations Rotating frequencies Unsteady numerical simulations Volute

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GB/T 7714 Yang, Yang , Wang, Zhi-Heng , Xi, Guang . Numerical Investigations on Inuence of Volute Non-Axisymmetry on Unsteady Flow in Centrifugal Compressor [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (11) : 2412-2419 .
MLA Yang, Yang et al. "Numerical Investigations on Inuence of Volute Non-Axisymmetry on Unsteady Flow in Centrifugal Compressor" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 11 (2018) : 2412-2419 .
APA Yang, Yang , Wang, Zhi-Heng , Xi, Guang . Numerical Investigations on Inuence of Volute Non-Axisymmetry on Unsteady Flow in Centrifugal Compressor . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (11) , 2412-2419 .
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An extension of advancing front technique on new target surface after virtual topology operations EI SCIE Scopus
期刊论文 | 2018 , 124 , 42-52 | ADVANCES IN ENGINEERING SOFTWARE
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Abstract :

In this paper, an extension of advancing front technique (AFT) on new target surface (NTS) after virtual topology operations has been achieved in order to suitably represent CAD model and enhance the accuracy of numerical analyses. The extension of AFT has been accomplished through two stages. In the first stage, through analysis of the connection features of the intersecting lines with geometric continuity, a new notion of NTS is proposed. Based on the new notion, the topology of NTS is adjusted to generate meshes and meet the requirements of numerical analyses. In the second stage, AFT is extended accordingly in order to realize the topology of NTS. Specifically, based on the concise description of the front configuration of AFT, all of the subordinate aspects of AFT, including meshing order, generation of elements and nodes, and validity checking, are optimized. With the extension of AFT in this fashion, the target surfaces of AFT have been extended from the parametric surfaces to the composite surfaces. Finally, two examples are calculated with the extended AFT. The results of the calculation have verified that the topology of the composite surfaces is suitable and that the extended AFT is accurate and efficient.

Keyword :

Advancing front technique (AFT) Composite surfaces New target surface (NTS) Geometric continuity

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GB/T 7714 Wang Wei , Fan Hongzhou , Xi Guang . An extension of advancing front technique on new target surface after virtual topology operations [J]. | ADVANCES IN ENGINEERING SOFTWARE , 2018 , 124 : 42-52 .
MLA Wang Wei et al. "An extension of advancing front technique on new target surface after virtual topology operations" . | ADVANCES IN ENGINEERING SOFTWARE 124 (2018) : 42-52 .
APA Wang Wei , Fan Hongzhou , Xi Guang . An extension of advancing front technique on new target surface after virtual topology operations . | ADVANCES IN ENGINEERING SOFTWARE , 2018 , 124 , 42-52 .
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INFLUENCE OF ADJUSTABLE INLET GUIDE VANES ON THE PERFORMANCE CHARACTERISTICS OF A SHROUDED CENTRIFUGAL COMPRESSOR EI CPCI-S Scopus
会议论文 | 2017 | ASME Turbo Expo: Turbine Technical Conference and Exposition
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Abstract :

A shrouded centrifugal compressor model stage used for 120,000 m(3)/h oxygen production air separation unit was designed and tested at several IGV stagger angles from -15 degrees to +60 degrees and machine Mach number from 0.97 to 0.5. Present research works aimed to assess the influence of the adjustable IGVs and the IGV modeling on the shrouded centrifugal compressor performance characteristics and inlet flow field and to explore the effect factors of the CFD prediction accuracy and compressor stability at different IGV stagger angles. The measured results show that the model stage with 0 degrees IGV stagger angle yields almost the same stagnation pressure ratio performance as the stage-only model but at a lower peak isentropic efficiency. With an appropriate IGV stagger angle setting ranging from -15 degrees to +30 degrees, the compressor stability could be efficiently enhanced. Numerical studies indicate that a large IGV hub gap may lead to a significant lag effect on the flow angle generated by the inlet guide vanes when increasing the IGV stagger angle.

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GB/T 7714 Tian, Yubao , Tang, Yonghong , Wang, Zhiheng et al. INFLUENCE OF ADJUSTABLE INLET GUIDE VANES ON THE PERFORMANCE CHARACTERISTICS OF A SHROUDED CENTRIFUGAL COMPRESSOR [C] . 2017 .
MLA Tian, Yubao et al. "INFLUENCE OF ADJUSTABLE INLET GUIDE VANES ON THE PERFORMANCE CHARACTERISTICS OF A SHROUDED CENTRIFUGAL COMPRESSOR" . (2017) .
APA Tian, Yubao , Tang, Yonghong , Wang, Zhiheng , Xi, Guang . INFLUENCE OF ADJUSTABLE INLET GUIDE VANES ON THE PERFORMANCE CHARACTERISTICS OF A SHROUDED CENTRIFUGAL COMPRESSOR . (2017) .
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EFFECT OF INFLOW CIRCUMFERENTIAL DISTORTION ON A TRANSONIC AXIAL COMPRESSOR EI CPCI-S Scopus
会议论文 | 2017 | ASME Turbo Expo: Turbine Technical Conference and Exposition
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Abstract :

The Inlet distortion, which may lead to the stability reduction or structure failure, is often non-ignorable in an axial compressor. In the paper, the three-dimensional unsteady numerical simulations on the flow in NASA rotor 67 are carried out to investigate the effect of inlet distortion on the performance and flow structure in a transonic axial compressor rotor. A sinusoidal circumferential total pressure distortion with eleven periods per revolution is adopted to study the interaction between the transonic rotor and inlet circumferential distortion. Concerning the computational expense, the flow in two rotor blade passages is calculated. Various intensities of the total pressure distortion are dismissed, and the detailed flow structures under different rotating speeds near the peak efficiency condition are analyzed. It is found that the distortion has a positive effect on the flow near the hub. Even though there is no apparent decrease in the rotor efficiency or total pressure ratio, an obvious periodic loading exists over the whole blade. The blade loadings are concentrated in the region near the leading edge of the rotor blade or regions affected by the oscillating shocks near the pressure side. The time averaged location of shock structure changes little with the distortion, and the motion of shocks and the interactions between the shock and the boundary layer make a great contribution to the instability of the blade structure.

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GB/T 7714 Li, Yurun , Wang, Zhiheng , Xi, Guang . EFFECT OF INFLOW CIRCUMFERENTIAL DISTORTION ON A TRANSONIC AXIAL COMPRESSOR [C] . 2017 .
MLA Li, Yurun et al. "EFFECT OF INFLOW CIRCUMFERENTIAL DISTORTION ON A TRANSONIC AXIAL COMPRESSOR" . (2017) .
APA Li, Yurun , Wang, Zhiheng , Xi, Guang . EFFECT OF INFLOW CIRCUMFERENTIAL DISTORTION ON A TRANSONIC AXIAL COMPRESSOR . (2017) .
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Efficient tool path generation for five-axis machining of a difficult machined centrifugal impeller SCIE Scopus
期刊论文 | 2017 , 9 (10) | ADVANCES IN MECHANICAL ENGINEERING | IF: 0.848
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Abstract :

This article presents an efficient tool path generation method for five-axis machining of a difficult machined centrifugal impeller. Geometry of centrifugal impeller is analyzed, and the inherent low efficiency of the machining of difficult machined centrifugal impeller is obtained. The tool path curves which are calculated by the most common iso-parametric method are shown to testify the waste in machining. The new type machining layers are calculated, and the new machining regions are achieved. The new tool path curves in each new machining region are calculated, and they are sparser and triangular. For the inherent low machining efficiency of difficult machined centrifugal impeller, the machining time can be greatly reduced just by the optimizing tool path generation method in this article. Numerical simulation and a real test impeller are presented as the test of the proposed method.

Keyword :

centrifugal impeller titanium alloy Tool path generation machining layer ruled surface

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GB/T 7714 Fan, Hong-Zhou , Xi, Guang . Efficient tool path generation for five-axis machining of a difficult machined centrifugal impeller [J]. | ADVANCES IN MECHANICAL ENGINEERING , 2017 , 9 (10) .
MLA Fan, Hong-Zhou et al. "Efficient tool path generation for five-axis machining of a difficult machined centrifugal impeller" . | ADVANCES IN MECHANICAL ENGINEERING 9 . 10 (2017) .
APA Fan, Hong-Zhou , Xi, Guang . Efficient tool path generation for five-axis machining of a difficult machined centrifugal impeller . | ADVANCES IN MECHANICAL ENGINEERING , 2017 , 9 (10) .
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A novel tool-path generation method for five-axis flank machining of centrifugal impeller with arbitrary surface blades EI SCIE Scopus
期刊论文 | 2017 , 231 (1) , 155-166 | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE | IF: 1.445
WoS CC Cited Count: 1
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Abstract :

The centrifugal impeller with arbitrary surface blades is a very important component in automobile, ships, and aircraft industry, and it is one of the most difficult parts to process. Focusing on the machining efficiency improvement, combining the geometric advantages of ruled surface and arbitrary surface, and utilizing the efficient and accurate advantages of flank machining and point machining, this article presents a novel and targeted tool-path generation method and algorithm for five-axis flank machining of centrifugal impeller with arbitrary surface blades. In light of specific characters of different surfaces, the analyses of two different impeller blades are proposed first, the more characteristic and complex geometrical structures of the arbitrary blade are achieved. In rough machining, an approximate ruled surface blade is obtained, and a simple channel is achieved; the flank milling of the centrifugal impeller with ruled surface blades is achieved relative to the point milling of the centrifugal impeller with arbitrary surface blades; and the triangle tool path planning method is added in this process to save the machining time and cost collectively. Furthermore, in semi-finish machining, the approximate sub-ruled blade surfaces are calculated, and a new flank milling method of the sub-ruled blade surfaces is achieved; a new solution for tool interference is achieved in this process and the generation of noninterference tool paths becomes easy. Machining experiments of two different impellers are presented as a test of the proposed methods.

Keyword :

approximate sub surface Tool path generation ruled surface arbitrary surface flank machining

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GB/T 7714 Fan, Hong-Zhou , Wang, Shang-Jin , Xi, Guang et al. A novel tool-path generation method for five-axis flank machining of centrifugal impeller with arbitrary surface blades [J]. | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE , 2017 , 231 (1) : 155-166 .
MLA Fan, Hong-Zhou et al. "A novel tool-path generation method for five-axis flank machining of centrifugal impeller with arbitrary surface blades" . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE 231 . 1 (2017) : 155-166 .
APA Fan, Hong-Zhou , Wang, Shang-Jin , Xi, Guang , Cao, Yan-Long . A novel tool-path generation method for five-axis flank machining of centrifugal impeller with arbitrary surface blades . | PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE , 2017 , 231 (1) , 155-166 .
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Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method EI SCIE Scopus
期刊论文 | 2017 , 105 , 90-101 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | IF: 3.891
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Abstract :

A particle-based meshless method, the moving particle semi-implicit (MPS) method, is employed in this study to simulate the process of liquid film breakup and atomization in a rotary atomizer. The computational framework incorporates a specially designed inlet flow model, a centrifugal force calculation, and a surface tension model to allow the simulation of the unsteady flow with extreme deformations. To improve efficiency, the searching algorithm of the MPS method is modified by eliminating redundant calculations. The computational framework is further utilized to systematically study the transition of the liquid from the bulk phase to a film, then to multiple belts, and finally to numerous droplets under the low pressure and flow rate conditions in the rotary atomization. Key mass transfer mechanisms underlying the atomization process are elucidated by a comprehensive analysis of the flow trajectories. The computational work is expected to improve the fundamental understanding of the rotary atomization process and facilitate future process optimization efforts. (C) 2016 Elsevier Ltd. All rights reserved.

Keyword :

Moving particle semi-implicit method Mixture Computational efficiency Atomization Rotary atomizer

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GB/T 7714 Sun, Zhongguo , Chen, Xiao , Xi, Guang et al. Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2017 , 105 : 90-101 .
MLA Sun, Zhongguo et al. "Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 105 (2017) : 90-101 .
APA Sun, Zhongguo , Chen, Xiao , Xi, Guang , Liu, Ling , Chen, Xi . Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2017 , 105 , 90-101 .
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