多重扰动下通气超空泡稳定性模拟研究  

Numerical Simulation of the Stability of Ventilated Supercavitation under Various Types of Disturbances

作　　者：万小辉[1] 于开平[1] 张广[1] 李振旺[1] 

机构地区：[1]哈尔滨工业大学航天学院,黑龙江哈尔滨150001

出　　处：《兵工学报》2013年第5期567-573,共7页Acta Armamentarii

基　　金：国家自然科学基金重点项目(10832007)

摘　　要：根据Logvinovich独立膨胀原理和质量守恒方程建立非定常通气超空泡数学模型,并基于此模型,分别考虑了通气扰动、速度扰动、空化器转动扰动及其组合多重扰动情况,对超空泡形态进行了数值模拟,进而对超空泡的稳定性进行了分析。研究表明:速度扰动对通气超空泡形态稳定性起主导性作用,其扰动带来的空泡振荡特性也最强烈;空化器转动扰动能小幅度影响超空泡形态,并决定空泡恢复稳定后的最终长度;通气扰动作用相对微弱,三者扰动同时存在时,其作用几乎可以忽略。A mathematical model of unsteady ventilated supercavitation is established based on the princi- ple of Logvinovich of the cavity sections expansion and mass conservation equation. The mathematical model is used to simulate the shape stability of ventilated supercavitation under the disturbances of air- supply rate, cavitator, velocity and some combination perturbation, respectively, and then the stability of ventilated supercavitation is analyzed. The results indicate that the disturbance of velocity plays a crucial role in the shape stability of ventilated supercavitation, and the oscillation of cavity is strong, the disturb- ance of cavitator can influence the shape stability of ventilated supercavitation with low-amplitude and de- termine the last length of cavity, the disturbance of air-supply rate is small compared with the others and can be ignored when they exist.

关 键 词：流体力学 多重扰动 空泡稳定性 独立膨胀原理 通气超空泡 非定常流动 

分 类 号：TV131.3[水利工程—水力学及河流动力学]