【摘要】 基于空间线性稳定性分析方法建立了描述同轴旋拧可压缩气流中黏性液体射流稳定性的数学模型,分析了气动力、黏性力、惯性力和表面张力等对射流稳定性的影响．结果表明:气流旋转对旋拧气流式液体射流起致稳作用,射流不稳定性随气流轴向引射速度A的增大先减小后增大;将气流轴向引射作用分为强引射作用(A>2)和弱引射作用(A≤2),在强引射范围内气流轴向引射速度对旋拧气流式液体射流一直起失稳作用．给定周围气流的旋转速度且增大气流轴向引射作用时,改变物性参数,射流轴对称扰动占优模式不会改变,且气流轴向引射作用对射流稳定性的影响不会发生质变;气体可压缩性以及气/液密度比对旋拧气流式液体射流起失稳作用;液体黏度起致稳作用;随表面张力增大,射流不稳定性先迅速减小后缓慢增大,表面张力较小时有利于射流失稳分裂．更多还原

【Abstract】 Based on the linear stability analysis,a mathematical model for the stability of a viscous liquid jet in a coaxial twisting compressible airflow has been developed. It takes into account the twisting and compressibility of the surrounding airflow,the viscosity of the liquid jet. Then,the effects of aerodynamics force,inertial force,surface tension and other forces on jet stability are analyzed. The results show,when the surrounding airflow twists,the swirling velocity of the surrounding has a stabilizing effect(the maximum disturbance growth rates decreases with the increasing of the airflow rotation strength E),while the axial direction of the surrounding airflow has a complex effect. The jet instability decreases first and then increases with the increase of the axial airflow velocity;the ejection of surrounding airflow is divided into weak ejection(A≤2)and strong ejection(A>2). When the gas-liquid velocity ratio A>2,which is meaningful for the jet breakup. Given the swirling velocity of the surrounding airflow,and increasing the axial ejection effect,it is found that the parameters do not change the dominant mode of liquid jet. Gas compressibility and gas-liquid density ratio play an unstable role in liquid jet,while liquid viscosity makes the liquid jet more stable. With the increasing of surface tension,jet instability first decreases rapidly and then increases slowly,when the surface tension is small,it is meaningful for jet breakup.更多还原