The investigation of mechanisms on pipe diffuser leading edge vortex generation and development in centrifugal compressor

Han, Ge; Yang, Chengwu; Wu, Shixun; Zhao, Shengfeng; Lu, Xingen

doi:10.1016/j.applthermaleng.2022.119606

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…In the process of compressor design and optimization, pressure ratio, surge margin, choke flow rate and efficiency are important performance parameters [38]. In this study, the compressor performance index included pressure ratio, surge margin, choke flow rate, joint point efficiency and maximum efficiency.…”

Section: Internal Joint Point Operation Law (Ijol) Methodsmentioning

confidence: 99%

Investigating a New Method-Based Internal Joint Operation Law for Optimizing the Performance of a Turbocharger Compressor

Huang

Fan

et al. 2023

Sustainability

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A well-matched relationship between the compressor and turbine plays an important role in improving turbocharger and engine performance. However, in the matching of turbocharger and engine, the internal operation relationship between compressor and turbine is not considered comprehensively. In order to fill this gap, this paper proposed the internal joint operation law (IJOL) method based on the internal operating characteristics of the compressor and turbine using a combination of experimental and simulation methods. On this basis, the optimization method of the compressor was proposed. Firstly, according to the basic conditions of turbocharger, the compressor power consumption and the turbine effective power at a fixed speed were solved. Secondly, the power consumption curve of the compressor and the effective power curve of the turbine were coupled to obtain the power balance point of the turbocharger. Then, the internal joint operating point was solved and coupled to obtain the IJOL method. Finally, the IJOL method was used to optimize the blade number and the blade tip profile of the compressor. The simulation results showed that for the blade number, the 8-blade compressor had the best overall performance. For the blade tip profile, compared with the original compressor, the surge performance of the impeller inlet diameter reduced by 3.12% was better than that of the original compressor. In addition, in order to compare this to engine performance with different compressor structures, a 1D engine model was constructed using GT-Power. The simulation results showed that the maximum torque of the engine corresponding to the impeller designed by the IJOL method was 4.2% higher than that of the original engine, and the minimum brake specific fuel consumption was 3.1% lower. Therefore, compared with the traditional method, the IJOL method was reasonable and practical.

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Section: Internal Joint Point Operation Law (Ijol) Methodsmentioning

confidence: 99%

Investigating a New Method-Based Internal Joint Operation Law for Optimizing the Performance of a Turbocharger Compressor

Huang

Fan

et al. 2023

Sustainability

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“…Zhang Yingjie et al [3] studied the structure of the diffuser vanes leading edge and found that the slot on the diffuser vanes leading edge could effectively inhibit the flow separation phenomenon in the diffuser channel, thus enhancing the stall margin of the centrifugal compressor. Ma Chao et al [4] studied the influence of diffuser vanes thickness distribution on the performance of centrifugal compressor, and found the best scheme for the distribution position of the maximum diffuser vane thickness.…”

Section: Introductionmentioning

confidence: 99%

Influence of Diffuser Vane Thickness on Centrifugal Compressor Performance

Yang

Liu

et al. 2023

J. Phys.: Conf. Ser.

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The structure of diffuser vanes has a significant influence on the performance of centrifugal compressors. To research the influence of diffuser vane thickness on the overall performance and internal flow condition of the centrifugal compressor. This paper takes a centrifugal compressor as the research object. By changing the diffuser vane thickness, and using three-dimensional fluid simulation technology to carry out simulation research. The results show that the thinner diffuser vanes can greatly improve the efficiency, flow rate and outlet temperature of the centrifugal compressor. For internal local fluid characteristics, thin diffuser blades have lower internal heat load. However, the local flow of fluid is not consistent with the change of vane thickness.

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“…10 In general, stall in compressors with vaned diffusers is more complicated, since the diffuser vanes are prone to unstable flow, 11 which has been extensively studied. Most studies focused on the unsteady vortex structure near the leading edge (LE) 12 of the diffuser vane. It was reported that the leading-edge vortex was the cause of the rotating stall and the diffuser inlet was the key region for compressor instability.…”

Section: Introductionmentioning

confidence: 99%

Spatial-Temporal evolution characteristics of pre-Stage-stall in a centrifugal compressor with a vaneless diffuser and a volute

Shi,

Ma,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The continuous throttling process is of great interest for compressor designers. Previous experimental studies mainly consider the temporal evolution characteristics of the pre-stage stall at the impeller inlet or outlet regions. In this study, we explore the spatial-temporal evolution characteristics of pre-stage-stall using a pressure array consisting of 15 high-response sensors. The dynamic evolution characteristics of the pressure signal on the time and frequency domains and the underlying unsteady flow structure evolution during the transition process were analyzed. We find that the evolution characteristics of pressure irregularity varied with the streamwise positions. The evolution process from the pre-stage stall point to the stage stall point can be divided into three stages based on the disturbance scale and pressure fluctuations, namely (I) the coexistence of the impeller RI, the mild impeller stall, and the mild diffuser stall, (II) the interaction of stall cell and RI disturbance, (III) a single large stall cell. In stage I, the streamwise influential regions of the stall cells are mainly confined in the impeller passage. In stage II, the stall cell expands upstream and gradually interacts with the RI disturbance. The wavelength of RI-related disturbance increases while the related pressure fluctuation decreases. In stage III, several stall cells merge into one large cell.

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The investigation of mechanisms on pipe diffuser leading edge vortex generation and development in centrifugal compressor

Cited by 8 publications

References 19 publications

Investigating a New Method-Based Internal Joint Operation Law for Optimizing the Performance of a Turbocharger Compressor

Investigating a New Method-Based Internal Joint Operation Law for Optimizing the Performance of a Turbocharger Compressor

Influence of Diffuser Vane Thickness on Centrifugal Compressor Performance

Spatial-Temporal evolution characteristics of pre-Stage-stall in a centrifugal compressor with a vaneless diffuser and a volute

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