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Chen Z.,Harbin Engineering University | Zheng Q.,Harbin Engineering University | Jiang B.,Harbin Engineering University | Chen H.,AVIG Shenyang Engine Design and Research Institute
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | Year: 2015

Flow separation has great influence on high-loaded helium compressors. In this paper, high-loaded helium compressor rectangular cascades with different loads, bowed angles and bowed heights were studied to understand the flow separation structure in the cascades. The SST turbulence model and γ-Reθ transition model were used in numerical simulation. The results showed that the pressure-side leg of horseshoe vortex results in the generation of concentrated shed vortex and corner vortex at the corner of the rectangular cascade. Open separated flow will transform into closed separated flow with the increase of attack angles and loads. Flow separation will be suppressed in the cascade as well as the pressure loss will drop by using proper bowed angle and height. ©, 2015, Editorial Board of Journal of HEU. All right reserved.


Jiang B.,Harbin Engineering University | Chen Z.,Harbin Engineering University | Chen H.,AVIG Shenyang Engine Design and Research Institute | Zhang H.,Harbin Engineering University | Zheng Q.,Harbin Engineering University
Nuclear Engineering and Design | Year: 2015

Helium compressor is a major component of the Power Conversion Unit (PCU) used in a High Temperature Gas Cooled Reactor (HTGR). Because the high cost of closed cycle test and leakage problem of helium gas, air could be used as working fluid instead of helium in compressor performance tests. However, the properties of Helium are largely different from those of air, e.g. the adiabatic exponent of Helium is 1.6, while the adiabatic exponent itself is a criterion of similarity between the two compressors. The characteristics of compressor will be different due to the effect of the adiabatic exponent of working fluid, especially for highly loaded compressor working at higher inlet Mach number. In this paper, a theoretical study on the similarity between air compressor and a highly loaded helium compressor is carried out and the deviation of similarity is analyzed. Numerical simulations are then used to confirm the theoretical analysis. The results indicate that the similarity deviation could not be neglected for highly loaded compressor cascade, which means the experience and experimental results of those conventional air compressor cannot be applied directly to the design of highly loaded helium compressor. The flow characteristics of a highly loaded helium compressor at different Reynolds numbers, attack angles, Mach numbers and cascade geometries are then investigated. © 2015 Elsevier B.V.

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