初生空化数的计算模型

从“气核惯性失稳导致空化”这一观点出发,提出了应用于数值模拟的初生空化判别标准及其数学模型,采用Ｍｏｎｔｅ－Ｃａｒｌｏ方法模拟空化现象中的各种随机因素,在可靠度的意义下将气核空化初生与流场空化初生联系起来．以黄河小浪底工程消能泄洪洞为例,对三级串联孔板的初生空化数作了计算．

Numerical model for predicting incipient cavitation number in a flow

Based on the concept that "the break up of equilibrium stability of gas nuclei yields cavitation", a criterion for distinguishing cavitation inception in a flow by numerical method is proposed in this paper. The corresponding mathematic model is set up, and the Monte-Carlo method is adopted to simulate the various random factors in cavitation phenomenon, the inception of nuclei cavitation and the inception of flow cavitation is linked in the sense of reliability. As an example, cavitation inception prediction in the orifice tunnel for water discharge and energy dissipation in the Xiaolongdi Milti-Purpose Project is carried out.