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Effects of Radial Gap Ratio between Impeller and Vaned Diffuser on Performance of Centrifugal Compressors

机译：叶轮与叶片扩压器径向间隙比对离心压缩机性能的影响

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摘要

A high-performance centrifugal compressor is needed for numerous industry applications nowadays. The radial gap ratio between the impeller and the diffuser vanes plays an important role in the improvement of the compressor performance. In this paper, the effects of the radial gap ratio on a high-pressure ratio centrifugal compressor are investigated using numerical simulations. The performance and the flow field are compared for six different radial gap ratios and five rotational speeds. The minimal radial gap ratio was 1.04 and the maximal was 1.14. Results showed that reducing the radial gap ratio decreases the choke mass flow rate. For the tip-speed Mach number (impeller inlet) with M u < 1, the pressure recovery and the loss coefficients are not sensitive to the radial gap ratio. However, for M u ≥ 1, the best radial gap ratio is 1.08 for the pressure recovery and the loss coefficients. Furthermore, the impeller pressure ratio and efficiency are reduced by increasing the radial gap ratio. Finally, the compressor efficiency was compared for different radial gap ratios. For M u < 1, the radial gap ratio does not have noticeable effects. In comparison, the radial gap ratio of 1.08 has the best performance for M u ≥ 1.
机译：当今，许多工业应用都需要高性能的离心压缩机。叶轮和扩压叶片之间的径向间隙比在改善压缩机性能中起着重要作用。本文利用数值模拟研究了径向间隙比对高压比离心压缩机的影响。比较了六个不同的径向间隙比和五个转速的性能和流场。最小径向间隙比为1.04，最大为1.14。结果表明，减小径向间隙比会降低节流阀的质量流量。对于M u <1的叶尖速度马赫数（叶轮入口），压力恢复和损耗系数对径向间隙比不敏感。但是，对于M u≥1，对于压力恢复和损耗系数，最佳径向间隙比为1.08。此外，通过增加径向间隙比来降低叶轮压力比和效率。最后，比较了不同径向间隙比下的压缩机效率。当M u <1时，径向间隙比没有明显的影响。相比之下，当M u≥1时，径向间隙比为1.08时具有最佳性能。

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