Abstract
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.
Highlights
Nowadays, the issues of environmental pollution and energy shortage have become two key problems restricting the progress of human society [1]
Performance compressor is when the heat capacity ratio of working fluid is different, To analyze theidentical influenceand of physical properties of working fluid on compressor cascade working fluid total pressure loss coefficient changes with the change in a set specific heat performance, the identical values of Reynolds number and Mach number are at inlet of ratio
The objective is to analyze the relationships of the coefficient of total pressure loss and static pressure ratio in subsonic-speed linear compressor cascade with the physical properties of the alternate working fluids
Summary
The issues of environmental pollution and energy shortage have become two key problems restricting the progress of human society [1]. The performance reduction of 50-MW EVO [11] German power plant is due to the wrong compressor performance analysis The influence of this problem is obvious in the research and development of carbon dioxide compressor. In order to create a compatible performance transfer method, Roberts highlighted that the compressor curve changes with dissimilar working fluid because of the disparity in specific heat ratio [15,16]. Zhu et al similarity criteria were derived using non dimensionless differential equations and similarity comparisons [17,18] He believes that the similarity standards of dissimilar working fluids may be Pr, Re, Sr, Eu, Pe, γ and Br. Air compressor characteristic charts are founded on empirical relationships based on similarity principles. The objective is to analyze the relationships of coefficient of total pressure loss and static pressure ratio in the compressor cascade with the alternate working fluids
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