超空化条件下液体射流热稳定性研究  

Study on the thermal stability of liquid jet under supercavitation

作　　者：吕明[1] 宁智[1] 阎凯[1] 付娟[1] 孙春华[1] 

机构地区：[1]北京交通大学机电工程学院,北京100044

出　　处：《计算力学学报》2014年第4期506-510,共5页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(51276011);北京市自然科学基金(3132016);国家高技术研究发展计划课题(2013AA065303);中央高校基本科研业务费专项资金(M12JB00090)资助项目

摘　　要：基于线性稳定性理论,建立了描述超空化条件下液体射流热稳定性的数学模型,并对数学模型及其求解方法进行了验证;在此基础上,对超空化条件下液体射流与周围气体间的温差对射流稳定性的影响进行了研究。研究结果表明,液体射流与周围气体间存在温差时,射流稳定性变差,扰动波波数范围拓宽,且拓宽的程度随温差的增加有明显加大的趋势;温度扰动对射流稳定性的影响与扰动模式关系不大;温度扰动会在一定程度上削弱超空化对射流稳定性的作用,并有可能完全抑制超空化对扰动波最大波数的作用,只有当超空化达到一定程度后,才能克服温度扰动的抑制作用,使扰动波最大波数变大。In this paper ,a mathematical model is presented for studying on the thermal stability of liquid jet under supercavitation .T he mathematical model and its solving method are verified by the data in liter-ature ,and then the influences of temperature differences between jet and surrounding gas on the stability of liquid jet are investigated mainly .T he results show that the temperature difference makes liquid jet more unstable ,widens the range of wave numbers and increases the degree of widening range ,while the effect of temperature disturbance on the stability of liquid jet has little relationship with disturbance modes .Not only does the temperature disturbance weaken the effect of supercavitation on the stability of liquid jet ,but also it is likely to fully restrain the effect of supercavitation on the maximum wave number of disturbance wave .However ,supercavitation makes the maximum wave number bigger again when su-percavitation reaches a certain value .

关 键 词：液体射流 热稳定性 温度扰动 超空化 

分 类 号：O358[理学—流体力学]