Numerical simulation of the unsteady cavitation behavior of an inducer blade cascade
Numerical simulation of the unsteady cavitation behavior of an inducer blade cascade
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发表时间：
2019
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通讯作者：
O. Coutier-Delgosha;Y. Courtot;F. Joussellin;J. Reboud
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作者：
O. Coutier-Delgosha;Y. Courtot;F. Joussellin;J. Reboud
涡轮泵诱导器中的不稳定性的一个来源在于旋转空化行为，其特征在于不同叶片上的不同空腔形状，这导致超同步或次同步扰动。这种现象是模拟的情况下，一个简单的二维叶片叶栅对应于一个典型的四叶诱导轮。建立了考虑非匹配连接和周期性条件的非定常空化水流数值模型。进行了单通道和四通道计算，在后一种情况下，非对称不稳定的湍流模式。根据质量流速和空化数的稳定性的限制。定性比较与实验，不稳定性判据，和不稳定性的机制进行了研究。
One source of unsteadiness in turbopump inducers consists in a rotating cavitation behavior, characterized by different cavity shapes on the different blades, which leads to super-or subsynchronous disturbances. This phenomenon is simulated for the case of a simple two-dimensional blade cascade corresponding to a typical four-blade inducer. A numerical model of unsteady cavitating flows was adapted to take into account nonmatching connections and periodicity conditions. Single-channel and four-channel computations were performed, and in the latter case, nonsymetrical unstable flow patterns were obtained. Limits of stability according to the mass flow rate and the cavitation number are presented. Qualitative comparisons with experiments, instability criterion, and the mechanisms of instabilities are also investigated.