非均相流模型在非定常空化流动计算中的应用及评价

摘要

文章评价了非均相流模型在非定常空化流动中的应用。分别采用均相流和非均相流模型，对绕水翼的非定常空化流动进行了数值计算，并与实验结果进行了对比。结果表明：相比常用的均相流模型，由于考虑了相间作用，应用非均相流模型计算得到的结果可以较好地预测附着空穴非定常发展过程，精确捕捉到反向射流的发展和更清晰的水汽界面；非均相流模型能较好地模拟大尺度空泡团的周期性脱落，同时能更好预测流体动力特性的非定常变化。%An evaluation of inhomogeneous model for computations of unsteady cavitating flows is present-ed. The unsteady cavitating flows around the hydrofoil is simulated with the homogeneous and inhomoge-neous model, respectively, and the numerical results are compared with the experiment. The results show that due to the consideration of the interaction between the phase, the inhomogeneous model simulates the details of transient flows more accurately, a re-entrant flow and sharp interface are observed. Meanwhile it can better predict the periodic shedding of large-scale bubbles and the hydrodynamic unsteady character-istics.