Experimental investigations on effects of the self-circulation casing treatment on acoustic and surge characteristics in a centrifugal compressor

Zhao, Ben; Zhou, Teng; Yang, Ce

doi:10.1016/j.ast.2022.108002

Cited by 11 publications

(2 citation statements)

References 12 publications

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“…24 Casing treatments are found to reduce surge and reduce the noise of the compressor operating near surge. 25,26 Furthermore, on an unsteady flow field of a centrifugal compressor under pulsating backpressure conditions highly unsteady conditions can trigger the dynamic stall of the compressor, shifting the surge line to smaller mass flow rates 27,28 In addition, experiments were conducted to understand the influence of Adjustable Inlet Guide Vanes (AIGVs) and Adjustable Vaned Diffusers (AVDs) on the compressors' pressure ratio, efficiency, and overall performance. It is found that the use of AIGVs and AVDs can significantly improve the compressors' overall performance over the entire operating range.…”

Section: Literature On Numerical Methodsmentioning

confidence: 99%

Aerodynamic performance enhancement of centrifugal compressor using numerical techniques

2024

F1000Res

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Background Centrifugal compressors are dynamic machines utilizing a rotating impeller, efficiently accelerate incoming gases, transforming kinetic energy into pressure energy for compression. They serve a wide range of industries, including air conditioning, refrigeration, gas turbines, industrial processes, and applications such as air compression, gas transportation, and petrochemicals, demonstrating their versatility. Designing a centrifugal compressor poses challenges related to achieving high aerodynamic efficiency, surge and choke control, material selection, rotor dynamics, cavitation, erosion, and addressing environmental considerations while balancing costs. Optimizing maintenance, reliability, and energy efficiency are essential aspects of the design process. Methods The primary objective of this research is to comprehensively investigate and improve the aerodynamic performance of centrifugal compressors. To accomplish this, a comprehensive investigation of variables such as blade number and hub diameter, along with various turbulence models will be conducted. This approach will leverage numerical techniques to fill the significant gaps in the current literature regarding centrifugal compressor design and optimization. The study encompasses the evaluation of two turbulence models, namely Shear Stress Transport and K-epsilon. Furthermore, it delves into the fine-tuning of blade geometry, including variations in blade number and hub diameter, aiming to refine the design for optimal performance. Extensive analyses using Ansys CFX encompass key variables such as Pressure, Mach Number, Density, Velocity, Turbulence Kinetic Energy, and Temperature. Results Notably, the optimized pressure profile yielded remarkable results, achieving a substantial 36% improvement, demonstrating the tangible benefits of these design enhancements. Conclusion The outcomes of this research hold significant utility for engineers, manufacturers, and regulatory bodies, offering invaluable insights and guidance to enhance compressor performance and efficiency.

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Section: Literature On Numerical Methodsmentioning

confidence: 99%

Aerodynamic performance enhancement of centrifugal compressor using numerical techniques

2024

F1000Res

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“…The parameters of A 1 , A 2 , A 3 , A 4 and A 5 were the weighting factors of surge margin, joint point efficiency, pressure ratio, choke flow rate and maximum efficiency. For the weight distribution of each parameter, turbocharger compressor work was increasingly close to the surge line, operating stability was critical for the compressor [40] and needed to broaden the compressor stable working regions, so the joint point of the surge performance weight distribution was the largest. The efficiency and pressure ratio of the joint point of the compressor directly reflected the compressor performance, which in turn determined the engine intake performance, so the efficiency and pressure ratio of the joint point of the compressor weight distribution were second only to that of surge performance.…”

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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Investigation of vaned diffuser endwall contouring technology for improving the stable operating range of a centrifugal compressor with an asymmetric volute

Cui,

Qin,

Jia

et al. 2024

Energy Science & Engineering

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In this study, nonaxisymmetric endwall contouring technology is employed as a passive control strategy to enhance the stable operating range of a centrifugal compressor with an asymmetric volute. The endwall contouring method is applied to the hub‐side wall of the vaned diffuser within a centrifugal compressor stage. Instead of utilizing a flat hub as the baseline diffuser, various diffuser configurations featuring hub‐side contoured endwalls are explored, with adjustments in the peak radial position and peak height of the convex and concave profiles. Numerical simulations are conducted to evaluate the performance of the centrifugal compressor stage with both the baseline and contoured vaned diffusers. The investigation explores the underlying flow control mechanisms and establishes the effective endwall contouring guidelines. The findings highlight the effectiveness of endwall contouring in enhancing the stable operating range of centrifugal compressors. Notably, a substantial enhancement of 15.1% in the stable operating range is achieved by employing the contoured diffuser with the peak radial position near the vane leading edge (LE) and the peak height at 20% of the vane height. The endwall contoured diffusers reduce the positive LE incidence angles to direct the fluid toward the suction side (SS), and increase the radial velocity near the SS to suppress the hub‐suction corner separations in the diffuser passages near the volute tongue. These improvements collectively contribute to the enhancement of diffuser flow characteristics. Finally, a set of effective endwall contouring guidelines is proposed to guide the endwall contouring design for enhancing the stable operating range of centrifugal compressors.

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Experimental investigations on effects of the self-circulation casing treatment on acoustic and surge characteristics in a centrifugal compressor

Cited by 11 publications

References 12 publications

Aerodynamic performance enhancement of centrifugal compressor using numerical techniques

Aerodynamic performance enhancement of centrifugal compressor using numerical techniques

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

Investigation of vaned diffuser endwall contouring technology for improving the stable operating range of a centrifugal compressor with an asymmetric volute

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