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文章选择小叶片50%叶高处的弦长不变,分别将其前缘前掠、后掠25°,连同原型共三个方案进行加密网格的高精度全粘定常数值模拟,并将对三个方案的设计工况的转子性能以及内部流动进行比较,试图找到小叶片掠形设计对压气机的影响规律。通过分析发现,对于文章选取的一类风扇转子来讲小叶片前缘掠形设计可以比常规方案效率提高0.3%,不良的掠形也可能比常规设计效率降低0.6%,使用掠形设计后,总压比将略有提高,通流能力基本不变,不利的掠形还会降低通流能力达4%。对于设计工况,小叶片前缘掠形在转子流道顶部主要是通过影响激波结构来改善流动,通过控制激波的位置以及强度可以降低流道中激波损失这一主要损失来源;而在流道底部,小叶片主要靠前缘膨胀波束建立壁面良好的压力曲线,来抑制大叶片附面层的发展,重点降低叶型损失,同时可以增加小叶片的负荷分配,这样既增加了小叶片以及整个转子的加功量,又可以改善流道中的横向压力梯度。 相似文献
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Genetic algorithms and artificial neural networks method were adopted to optimize the camber line shape of splitter cascade in a transonic axial fan. For a certain type of transonic axial fan, the isentropie efficiency was improved by 0. 6% with the modification of splitter cascade rotor. Numerical simulation studies show that the curvature of the optimum splitter cascade with larger suction side is increased, the static pressure gradient is reduced, the process of flow expansion on suction surface is controlled and the separation near hub is eliminated by changing the shock wave structure. The efficiency near hub is improved by 1.3%. 相似文献
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