对微型燃机向心透平叶轮顶部间隙流动在级环境下进行了全三维粘性数值模拟.研究结果表明:顶部间隙小于2%时,间隙每增加1%,级效率降低1.5%,而级通流能力有所降低;径向与轴向间隙变化对级性能影响有很大差别,径向间隙增加对级效率降低的影响是轴向间隙增加的8.3倍,径向间隙增加使通流能力增强的程度是轴向间隙增加使通流能力减弱的4.2倍.此外,将间隙流场与文献报道试验结果进行了比较,差别主要在工作轮顶部区域.
参考文献
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