Experimental research of sound excitation on flow of subsonic compressor blade profile in planar cascade tunnel
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摘要: 针对非定常两代流型理论的验证展开了大量的试验研究工作.为了简化同时又能抓住问题的本质,试验研究首先从平面叶栅风洞上起步.在测得各个工况下叶栅后旋涡脱落特征频率的基础上,采用声激励的试验手段,系统研究了非定常扰动之间的相互作用.通过加激励前后总压损失的对比、流场特征参数频谱图的对比和具体气动参数的对比,证实了合理组织各个非定常扰动的相互作用可以提升叶栅的气动性能,说明了"非定常耦合流型"在叶轮机中存在的可能性.Abstract: A lot of work was done in planar cascade tunnel to validate the theory on two generations of unsteady flow type. In the first phase ,the frequency of all kinds of work condition was got. In the second phase, the method of sound excitation was used based on the frequency got forward to research the interaction between variable unsteady disturbances. Through comparing the total pressure loss,frequency spectra of flowfield’s parameter and aerodynamic parameters of unforced condition with those of forced condition, the results of research confirm that the aerodynamic performance of cascade can improved if the interaction of unsteady disturbs in the flowfield can reasonable organization.
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Key words:
- planar cascades /
- acoustic excitation /
- vortex shedding
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