脉动压力下旋流喷嘴流动特性的数值模拟

对旋流喷嘴在脉动压力作用下的内部流动进行了数值模拟，分析了瞬时流量、平均流量、雾化角、脉动压力与瞬时流量间相位差随脉动压力频率的变化规律．结果表明：瞬时流量和雾化角均呈现与脉动压力频率相同的周期性变化，且瞬时流量与雾化角之间相位相差一个兀角；喷嘴出口的平均流量随脉动压力频率的变化呈振荡变化，其变化规律比较复杂．

Numerical Simulation of Swirl Nozzle Flow Characteristics at Pulsating Pressures

Numerical simulation on flow characteristics in a swirl nozzle has been carried out at pulsating pressures, while how following factors vary with the pressure pulsating frequency analyzed, such as the instantaneous flow, average flow, atomization angle and the phase difference between the pulsating pres sure and the instantaneous flow, etc. Results show that the instantaneous flow and atomization angle change periodically at the same frequency as the pulsating pressure, and the phase difference between them is π; the average flow at nozzle outlet changes in an oscillatory way with the rise of pressure pulsating frequency, of which the variation law is relatively complicated.