Numerical investigation of the effects of system volume and average mass flow on the surge characteristics of an axial compressor
Numerical investigation of the effects of system volume and average mass flow on the surge characteristics of an axial compressor
复制标题
系统容积和平均质量流量对轴流压缩机喘振特性影响的数值研究
DOI：
10.1016/j.ast.2020.106172
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发表时间：
2020-09
影响因子：
5.6
通讯作者：
Luan Yigang
中科院分区：
文献类型：
--
作者：
Wang Meng;Sun Haiou;Wang Zhongyi;Wang Yanhua;Franco Magagnato;Luan Yigang
本文采用BDF/谐波平衡法对轴流压气机在喘振工况下的喘振特性进行了研究。在喘振事件期间，在压缩机中发生大量回流。因此，气流沿轴向沿着以低频率振荡，这会显著损坏压缩机。本文对NASA格伦中心设计和评估的一台跨音速高速单级轴流压气机（35级）的喘振特性进行了数值研究，考察了系统容积和平均质量流量对喘振特性的影响。结果表明，喘振工况下，压气机内气流的振荡频率一般在14.32- 26.04Hz之间，系统容积和平均质量流量对喘振特性有显著影响。对于恒定的平均质量流量，随着系统体积的减小，压气机内气流的振荡频率略有增加，而出口静压的振荡幅度显著减小，出口处的最大静压几乎保持恒定。在系统容积一定的情况下，随着平均质量流量的减小，压气机内气流的振荡频率逐渐减小，出口压力的振荡幅度显著增大。随着平均质量流量的进一步减小，振荡频率稳定在某个点上，并且不改变频率。此外，用数值方法得到的喘振频率与亥姆霍兹频率的趋势相同，但两者之间有很大的差异。
The objective of this work is to evaluate the surge characteristics of an axial compressor operating under surge conditions, by using a hybrid BDF/harmonic balance method. During a surge event, a large amount of backflow occurs in the compressor. Consequently, the airflow oscillates along the axial direction at a low frequency, which can considerably damage the compressor. In this paper, a numerical investigation is performed to examine the effects of the system volume and average mass flow on the surge characteristics of a transonic high speed single stage axial compressor (stage 35) designed and evaluated at the NASA Glenn Center. The results show that the oscillation frequency of the airflow in the compressor generally ranges from 14.32–26.04 Hz during surge conditions, and both the system volume and average mass flow considerably influence the surge characteristics. For a constant average mass flow, as the system volume decreases, the oscillation frequency of the airflow in the compressor increases slightly, while the oscillation amplitude of the exit static pressure decreases significantly, and the maximum static pressure at the outlet remains nearly constant. In the case of a constant system volume, with the decrease in the average mass flow, the oscillation frequency of the airflow in the compressor gradually decreases, and the oscillation amplitude of the exit pressure increases significantly. With a further decrease in the average mass flow, the oscillation frequency stabilizes at a certain point and does not change thenceforth. Furthermore, the surge frequency obtained using the numerical method shows a same tendency with the Helmholtz frequency, but there is a considerable difference between them.
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