基于Logvinovich独立膨胀原理的超空泡形态计算方法

根据Logvinovich独立膨胀原理发展了一种用于计算定常、非定常自然和通气超空泡形态的计算方法。运用该方法对在圆盘空化器速度和流场压力扰动下的自然和通气超空泡非定常变化过程进行了数值仿真，结果表明：自然超空泡在非定常和准定常条件下的形态特性存在较大差别，超空泡长度变化相对于非定常扰动表现出时间滞后性；通气超空泡与自然超空泡形态特性也存在差别，通气超空泡在非定常扰动下的过渡时间较长，振动幅度较大。

A Calculation Method for Supercavity Shape Based on the Logvinovich Independence Principle of the Cavity Section Expansion

A calculation method was brought forward to calculate steady and unsteady natural and ven?tilated supercavities based on the Logvinovich principle of the cavity sections expansion. Unsteady nat?ural and ventilated supercavities disturbed with the changes of disk cavitator velocity and flowfield pressure were simulated by the method. The simulated results indicate that the shape characteristic of quasi-steady natural supercavity is distinct from that of unsteady natural supercavity, the change of un?steady supercavity length lags behind disturbances; the shape characteristic of natural supercavity is al?so distinct from that of ventilated supercavity, ventilated supercavity has longer transition time and larger oscillating amplitude than those of natural supercavity under unsteady disturbance.