Cause of Cavitation Instabilities in Three Dimensional Inducer
Cause of Cavitation Instabilities in Three Dimensional Inducer
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DOI：
10.5293/ijfms.2009.2.3.206
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发表时间：
2009-09
影响因子：
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通讯作者：
D. Kang;K. Yonezawa;H. Horiguchi;Y. Kawata;Y. Tsujimoto
中科院分区：
文献类型：
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作者：
D. Kang;K. Yonezawa;H. Horiguchi;Y. Kawata;Y. Tsujimoto
利用三维商用CFD程序对火箭涡轮泵诱导管内的交替叶片空化、旋转空化和空化喘振进行了数值模拟。为了明确空化不稳定的原因，将空化条件下的速度矢量减去非空化条件下的速度矢量，得到空化引起的速度扰动。结果表明，在叶顶空腔尾缘处存在扰动流动。这种流动有一个流向下游的轴向流动成分，这减少了与下一个叶片的入射角。研究发现，所有的空化不稳定性都是在该流开始与下一个叶片前缘相互作用时开始发生的。实验验证了扰动流的存在性。
Alternate blade cavitation, rotating cavitation and cavitation surge in rocket turbopump inducers were simulated by a three dimensional commercial CFD code. In order to clarify the cause of cavitation instabilities, the velocity disturbance caused by cavitation was obtained by subtracting the velocity vector under non-cavitating condition from that under cavitating condition. It was found that there exists a disturbance flow towards the trailing edge of the tip cavity. This flow has an axial flow component towards downstream which reduces the incidence angle to the next blade. It was found that all of the cavitation instabilities start to occur when this flow starts to interact with the leading edge of the next blade. The existence of the disturbance flow was validated by experiments.