同轴旋转可压缩气流中黏性液体射流形态研究  

Study on the Morphology of Viscous Liquid Jet in aCoaxial Swirling Airflow

作　　者：吕明[1] 郭立梅 宁智[1] Lyu Ming;Guo Limei;Ning Zhi(School of Mechanical,Electronic and Control Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《内燃机学报》2024年第1期53-60,共8页Transactions of Csice

基　　金：国家自然科学基金资助项目(52276026)。

摘　　要：采用射流线性稳定性分析方法,考虑液体黏性、周围气流的同轴旋转运动以及可压缩性的条件下,建立了描述同轴旋转可压缩气流中黏性液体射流的数学模型,并进行了验证,研究了气流量纲为1旋转强度以及流体物性对液体射流不稳定形态的影响.研究表明:周围气流的旋转速度较小时,对射流起促稳作用,继续增大气流量纲为1旋转强度,开始对射流起促分裂作用;且随着气流旋转强度的增大,射流扰动沿周向方向发展,射流柱变的高度不对称.在研究参数范围内,气体可压缩性和气/液密度比均能促进射流的失稳,并会影响射流空间形态,尤其是在周向方向上能够改变射流的占优模式,增强射流的不对称性;液体黏性以及表面张力对射流均具有增强稳定性的作用.Based on the linear stability analysis method,considering the liquid viscosity,the coaxial rotating motion and compressibility of the surrounding airflow,a mathematical model describing the viscous liquid jet in the coaxial rotating compressible airflow was established and verified,and the effects of the dimensionless rotation intensity of the airflow and the physical properties of the fluid on the unstable form of the liquid jet were studied.The results show that when the rotation speed of the surrounding airflow is small,it promotes the jet stability,continues to increase the dimensionless rotation intensity of the airflow,and begins to promote the splitting of the jet.With the increase of airflow rotation intensity,the jet disturbance develops along the circumferential direction,and the jet column becomes highly asymmetric.In the range of parameters studied in this paper,gas compressibility and gas-liquid density ratio surface tension can promote the instability of the jet and affect the spatial shape of the jet,especially in the circumferential direction,it can change the dominant mode of the jet and enhance the asymmetry of the jet.Both surface tension and liquid viscosity are conducive to the jet stability.

关 键 词：液体射流 气流旋转 数学模型 射流形态 

分 类 号：O358[理学—流体力学]