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中文摘要：
采用二维方法,预先给定扩压器入口的射流-尾迹分布,忽略边界层的影响,对一具有大宽度无叶扩压器进行了数值模拟;分析了扩压器长度、叶轮叶片数目等因素对失速的影响.计算结果表明：对于宽度不同的扩压器存在不同的失速机理,相关结论和文献结果的比较也证实了该方法的正确性.
英文摘要：
Two-dimensional model, where the influence of wall boundary layers is neglected and inlet jetwake velocity patterns are prescribed, was applied to simulate one vanless diffuser with large width-radius ratio. The impact of diffuser length,impeller blade number, etc on the rotating stall was analyzed. The computational results show that different mechanism does exisit for the diffuser with different width-radius ratio. Comparison of the related conclusions and references is supportive for the correctness of the model.
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