Similarity and cascade flow characteristics of a highly loaded helium compressor

“…With the effect of the adiabatic exponent, the helium compressor characteristics will differ from the air compressor. 11 Therefore, it is necessary to develop the flow similarity laws and improve the accuracy of dynamic similarity experiments. 12 The compressor performance experiment can be conducted on either the prototype compressor or the geometrically scaled compressor.…”

Section: Introductionmentioning

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:

View full text Add to dashboard Cite

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.

show abstract

“…Eu and Re are more accurate than the empirical relationship founded on universal similarity principles such as Ma and Re as specific heat ratio in Eu is self-contained. Chen and Jiang linked the stream features of air and helium at dissimilar Mach numbers [19]. They believe that air and helium specific heat ratios has an important effect in increasing Mach number.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Different Working Fluids on Compressor Cascade Performance

2021

Self Cite

View full text Add to dashboard Cite

The compressor of closed Brayton cycle (CBC) plant operating with working fluid other than air is a vital element of the energy conversion unit. However, due to insufficient understanding of the influence of the physical properties of working fluids on the performance of the compressor, the actual working conditions and design conditions of the compressor’s performance deviate greatly. In this paper, the objective is to analyze the influence mechanism of the physical properties on the performance of the cascade of compressor (static pressure ratio and total pressure loss coefficient). Therefore, the impact of a specific heat ratio on the performance of the compressor cascade is studied utilizing carbon dioxide (γ = 1.29), air and carbon monoxide (γ = 1.4), argon and helium (γ = 1.667). Moreover, the relationships of static pressure ratio and total pressure loss coefficient with physical properties of the working fluids are analyzed in the compressor cascade. It is established that a higher specific heat ratio fluid gives a higher coefficient of total pressure loss and static pressure ratio in contrast to smaller specific heat ratio at matching inlet Reynolds number and Mach number.

show abstract

Similarity and cascade flow characteristics of a highly loaded helium compressor

Cited by 17 publications

References 19 publications

Performance conversion of centrifugal compressors based on predictor corrector method

Performance conversion of centrifugal compressors based on predictor corrector method

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

Investigation of the Effects of Different Working Fluids on Compressor Cascade Performance

Contact Info

Product

Resources

About