Abstract The highly loaded design method of helium compressor can effectively resolve the problem of helium compression in high temperature gas cooled reactor (HTGR). However, the alteration in design method has led to the variation of its characteristics at the same speed. In order to resolve this issue, in this paper, a three-dimensional, multi-passage unsteady numerical analysis is conducted to develop the understanding of the performance of a 1.5 stages highly loaded helium compressor. At first, the influence of the highly loaded design method on the unsteady flow of helium compressor is analyzed at the design point. Then, the instability characteristics of highly loaded helium compressor are studied by analyzing the flow field near stall point. Finally, the main factors causing the instability of highly loaded helium compressor are discussed. The result shows that radial separation which is caused by the inverse pressure gradient at the stator root is the main factor causing instability in highly loaded helium compressor.

中文翻译：

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高负荷设计方法对氦气压缩机稳定性影响的研究

摘要 氦气压缩机的高负荷设计方法可以有效解决高温气冷堆（HTGR）中的氦气压缩问题。然而，设计方法的改变导致其特性以相同的速度变化。为了解决这个问题，在本文中，进行了三维、多通道非定常数值分析，以加深对 1.5 级高负载氦气压缩机性能的理解。首先在设计点分析了高负荷设计方法对氦气压缩机非定常流动的影响。然后，通过分析失速点附近的流场，研究了高负荷氦气压缩机的失稳特性。最后讨论了引起高负荷氦气压缩机不稳定的主要因素。