Study on Two Types of Stall Patterns in a Centrifugal Compressor with a Wide Vaneless Diffuser

Zhang, Qian; Zhang, Liang; Huo, Qiuhong; Zhang, Lei

doi:10.3390/pr8101251

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…Ibaraki [9,10] found that the interaction of shock wave and tip leakage flow enhanced the blockage of the blade channel and caused flow loss in a transonic centrifugal compressor. Owing to the complex flow behavior mentioned above, the efficiency [11] and Stable Flow Range (SFR) [12,13] declined sharply with increasing pressure ratio in a centrifugal compressor. Therefore, the low efficiency and narrow SFR severely restrict the development and application of high-pressure-ratio centrifugal compressors, and this situation could become more severe with the design pressure ratio increased to an ultra-high level (higher than 10.0).…”

Section: Introductionmentioning

confidence: 99%

Effect of Self-Recirculating Casing Treatment on the Aerodynamic Performance of Ultra-High-Pressure-Ratio Centrifugal Compressors

et al. 2023

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The motivation to design a more efficient and compact aircraft engine leads to a continuous increase in overall pressure ratio and decrease in the stage number in compressors. Compared to the traditional multi-stage compressor, a single-stage ultra-high-pressure-ratio centrifugal compressor with a pressure ratio higher than 10.0 can significantly improve the engine’s power-to-weight ratio and fuel economy with a reduced structure complexity. Thus, it has great potential to be adopted in the compression system of advanced aero engines, such as turboshaft engines, in the future. However, the highly narrow Stable Flow Range (SFR) of ultra-high-pressure-ratio centrifugal compressors is a severe restriction for engineering applications. This research focuses on the aerodynamic performance of a ultra-high-pressure-ratio centrifugal compressor, and three-dimensional simulation is employed to investigate the effect of Self-Recirculating Casing Treatment (SRCT) on the performance and stability of the centrifugal compressor. Firstly, the parametric model of SRCT is established to investigate the effect of geometry parameters (rear slot distance and rear slot width) on the aerodynamic performance of the centrifugal compressor. It is concluded that SRCT improves the compressor’s SFR but deteriorates its efficiency. Also, a non-linear and non-monotone relationship exists between the SFR and rear slot distance or width. Then, the flow mechanism behind the effect of SRCT is explored in detail. By introducing the SRCT, an additional flow path is provided across the blade along the circumferential direction, and the behavior of the shock wave and tip leakage flow is significantly changed, resulting in the obviously different loading distribution along the streamwise direction. As a result, the mixing and flow separation loss are enhanced in the impeller flow passage to deteriorate the efficiency. On the other hand, the blockage effect caused by the mixing of slot recirculation and mainstream flow near the impeller inlet increases the axial velocity and reduces the incidence angle below the 90% spanwise section, which is considered to effectively stabilize the impeller flow field and enhance the stability.

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Section: Introductionmentioning

confidence: 99%

Effect of Self-Recirculating Casing Treatment on the Aerodynamic Performance of Ultra-High-Pressure-Ratio Centrifugal Compressors

et al. 2023

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“…Centrifugal compressor has the advantages of compact structure, durability, and highpressure ratio, and there is a lot of research on targeted applications in the corresponding fields [1][2]. In the past, the research on centrifugal compressors mainly focused on aerodynamic aspects, and the main goal of this research work was to improve efficiency, pressure ratio and operating range [3].…”

Section: Introductionmentioning

confidence: 99%

Intelligent Identification of Rotating Stall for Centrifugal Compressor based on Pressure Pulsation Signals and SDKAE Network

Zhao

et al. 2022

JDMD

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Most accidents of centrifugal compressors are caused by fluid pulsation or unsteady fluid excitation. Rotating stall, as an unstable flow phenomenon in the compressor, is a difficult point in the field of fluid machinery research. In this paper, A stack denoising kernel autoencoder neural network method is proposed to study the early warning of rotating stall in a centrifugal compressor. By collecting the pressure pulsation signals of the centrifugal compressor under different flow rates in engineering practice, a double hidden layer sparse denoising autoencoder neural network is constructed. According to the output labels of the network, it can be judged whether the rotation stall occurs. At the same time, the Gaussian kernel is used to optimize the loss function of the whole neural network to improve the signal feature learning ability of the network. From the experimental results, it can be seen that the flow state of the centrifugal compressor is accurately judged, and the rotation stall early warning of the centrifugal compressor at different speeds is realized, which lays a foundation for the research of intelligent operation and maintenance of the centrifugal compressor.

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Study on Two Types of Stall Patterns in a Centrifugal Compressor with a Wide Vaneless Diffuser

Cited by 2 publications

References 25 publications

Effect of Self-Recirculating Casing Treatment on the Aerodynamic Performance of Ultra-High-Pressure-Ratio Centrifugal Compressors

Effect of Self-Recirculating Casing Treatment on the Aerodynamic Performance of Ultra-High-Pressure-Ratio Centrifugal Compressors

Intelligent Identification of Rotating Stall for Centrifugal Compressor based on Pressure Pulsation Signals and SDKAE Network

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