离心压气机无叶扩压段流路控制扩稳机理
Stall improvement mechanism of vaneless diffuser flow path control in a centrifugal compressor
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摘要: 为寻求叶轮-扩压器间无叶扩压段流路控制的扩稳机理,选取某离心压气机为研究对象,利用数值模拟的方法,通过流场分析解释其失速机理,并在此基础上重新设计无叶扩压段机匣结构,探讨一种有效流路控制扩稳方式.分析结果表明:将无叶扩压段机匣结构设计为先收缩后扩张型后,离心压气机稳定工作范围提高了2.8%,但绝热效率有所降低.Abstract: To investigate the stall improvement mechanism of vaneless diffuser flow path control,a centrifugal compressor was simulated and compared with existing experimental data.According to characteristics of flow field and stall mechanism,a convergent-divergent type of impeller-diffuser casing designed was analyzed.The result shows that the stable flow range of centrifugal compressor increases by 2.8%,however,no obvious positive effects are found on the adiabatic efficiency which is slightly lower than that of the prototype.
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Key words:
- vaneless diffuser /
- casing structure /
- flow path control /
- stall improvement /
- centrifugal compressor
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