处理机匣激励频率对跨声速压气机性能的影响

Effect of exciting frequency of casing treatment on transonic compressor performances

关键词:  跨声速压气机  处理机匣  非定常流  激励频率

Key words:  Casing treatment  Transonic compressor  Unsteady flow  Exciting frequency

摘要:

通过改变处理机匣槽数来改变处理机匣对压气机内部流场的非定常激励频率,对4种激励频率下压气机性能进行了测试。实验结果表明,处理机匣槽数对应的非定常激励频率是影响压气机性能的关键因素之一。通过优化处理机匣对压气机非定常激励的频率,压气机性能可以得到全面提升:对于实验用跨声速压气机,在近设计转速下峰值效率、综合裕度和最大流量分别提高0.17%,19.86%和0.81%,而在低转速下这三个增量最大分别可达到1.13%,57.84%和1.57%。

Abstract:

Experiments were conducted to explore the effect of unsteady exciting frequency of casing treatment on transonic compressor performances.Unsteady exciting frequencies were changed by changing the slot number of casing treatment.Compressor performances under four different exciting frequencies were respectively measured.Experimental results indicate that the unsteady exciting frequency due to number of slots of casing treatment is one of the most important factors for compressor performances.Compressor performances can be overall enhanced through optimizing this unsteady exciting frequency.For the transonic compressor herein,peak efficiency,stall margin and maximum flow mass can be improved by 0.17%,19.86% and 0.81% respectively at near design rotating speed and these increases can be maximally extended to 1.13%,57.84% and 1.57% respectively at low rotating speed.