An experimental investigation of the vane clocking effects on the centrifugal compressor time-averaged performance

Li, Xuechen; Wuqi, Gong; Zhang, Xiaohong; Xi, Guang; Zhao, Jun; Wenjin, Cao

doi:10.1177/0957650913513252

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…Figure 9(b) displays the pressure ratio of three cases. The data are also calculated using the proposed transformation equation (28). The comparison shows that the simulations of the air compressor overpredict the pressure ratio.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

“…The NASA Lewis Research Center in the USA built a low-speed large-scale centrifugal compressor with a design tip speed of 153 ms 21 and an exit diameter of 1.524 m. 25,26 Xi'an Jiaotong University in China also has a large-scale low-speed centrifugal compressor facility. 27,28 The impeller has an outlet diameter of 0.796 m and a rotation speed of 3100 rpm. Therefore, there is no technology shortage in compressor size.…”

Section: Cycle Parameter Analysismentioning

confidence: 99%

See 1 more Smart Citation

Study on alternative cycles for high-pressure low-temperature helium compressor performance experiments based on flow similarity

Liu

Song

Zhao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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A low-temperature high-pressure helium compressor is one of the key components in a hypersonic air-breath engine cycle. Its aerodynamic performance is the basis of engine cycle design and control. The low-temperature and high-pressure conditions make it difficult in a laboratory environment to conduct a compressor performance experiment, thus constraining the engine cycle design. An alternative method is to test the compressor with other gas at a reference operation condition and then calculate the helium compressor performance according to the test results using transformation laws. This paper investigates the transformation method based on the dynamic similarity principle and derives transformation equations. CFD simulations performed on the compressors validate the equations. Eventually, the study analyzes the alternative experimental cycles.

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Section: Comparison Of Resultsmentioning

confidence: 99%

Section: Cycle Parameter Analysismentioning

confidence: 99%

Study on alternative cycles for high-pressure low-temperature helium compressor performance experiments based on flow similarity

Liu

Song

Zhao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Numerical investigation of clocking effect on a centrifugal pump with inlet guide vanes

Tan

Cao

et al. 2016

Engineering Computations

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Purpose The paper aims to investigate the clocking effect on a centrifugal pump with inlet guide vanes (IGVs). Design/methodology/approach The paper uses a computation fluid dynamics (CFD) framework to solve the unsteady flows in a centrifugal pump with inlet guide vanes. The relative position between the stationary vanes and the stationary volute tongue is defined as the clocking position when IGVs inside the suction pipe rotate along the circumferential direction. Findings The results show that clocking positions have little effect on the pump head and efficiency, however their influences are obvious for the pressure fluctuation and flow field in the centrifugal pump. The maximum difference of pressure amplitude at dominant frequency reach up to 28% on the monitoring point V8 at different clocking positions under design flow rate. For the large flow rate, the clocking effect on flow field and pressure fluctuation in centrifugal pump is similar to that of design flow rate. However, the clocking effect is nearly negligible at partial flow rate, because there are reverse flows around the tongue tip and obvious vortexes forming and developing in the impeller. Those complex phenomena interacting in the centrifugal pump make the clocking effect less evident. Originality/value The numerical investigation reveals the clocking effect on a centrifugal pump with inlet guide vanes, which also valuable for the stable operation and optimal design of centrifugal pumps.

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Potential of the range extension of compressors with a variable inlet prewhirl for automotive turbocharged engines with an ultra-high-power density

Zheng

Huang

2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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Downsizing is an effective way to improve the fuel economy of an engine and to reduce the emissions. For turbocharged engines, further downsizing or increasing the power density requires air to be compressed to a higher pressure. However, conventional compressors have a narrow stable operating range at high pressure ratios and cannot provide such highly pressurized air for ultra-high-power-density engines. Thus, a variable inlet prewhirl is employed to extend the stable operating range of the compressor. This paper investigates the performance of a centrifugal compressor with different prewhirls and speeds, quantitatively estimates the potential of range extension with a variable inlet prewhirl and discusses the mechanisms thought to be responsible for the range extension. The approach combines steady threedimensional Reynolds-averaged Navier-Stokes simulations with theoretical analysis. In order to make the study universal to various applications with a inlet prewhirl, the inlet prewhirl was generated by giving a velocity direction at the inlet boundary of the numerical method. A variable inlet prewhirl from 0°to 60°improves the stable operating range from 23.5% to 49.0% at a pressure ratio of 4.8. The extended range is based on the shifts in the choke line and the surge line with a positive inlet prewhirl. The decreased choking flow with a positive inlet prewhirl is mainly caused by the drop in the work input from the impeller. The dominant factor in reducing the surge flow of compressor is the highly increased stability of the impeller. It is also found that the impeller tends to choke and the diffuser tends to surge with increasing prewhirl. By extending the stable operating range of the compressor with a variable inlet prewhirl from 0°to 60°, the improvement in the maximum pressure for turbocharged engine is about 64% and the increase in the brake torque is estimated to be up to 42%.

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An experimental investigation of the vane clocking effects on the centrifugal compressor time-averaged performance

Cited by 4 publications

References 29 publications

Study on alternative cycles for high-pressure low-temperature helium compressor performance experiments based on flow similarity

Study on alternative cycles for high-pressure low-temperature helium compressor performance experiments based on flow similarity

Numerical investigation of clocking effect on a centrifugal pump with inlet guide vanes

Potential of the range extension of compressors with a variable inlet prewhirl for automotive turbocharged engines with an ultra-high-power density

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