为研究燃油流量瞬时变化时离心喷嘴的初始雾化特征，以高频激光和高速相机作为测试系统，以柱塞泵提供流量激励作为非定常输入进行了试验研究。研究表明：离心喷嘴初始雾化的初始液膜段流动稳定，基本无扰动；无流量激励下的液膜扰动段和初始雾化终点存在较明显的波动特征；在29.2%流量激励下的试验结果表明，流量激励不影响初始液膜的流动，但会导致初始雾化终点以1.8 mm的幅值和21 Hz的主频率呈周期性变化。

In order to investigate the primary atomization characteristics of simplex swirl atomizer when the fuel flow changes instantaneously,taking high frequency laser and highspeed camera as the testing system,the simplex swirl atomizer induced by unsteady massflow rate input provided by a ram pump is studied experimentally.The research shows that the initial part of liquid sheet of the primary atomization of simple swirl atomizer flows steadily and no basically disturbance is observed.The more obvious fluctuation is observed in the middle part of liquid sheet and the destination of primary atomization without unsteady massflow rate input.The test results shows that the initial liquid sheet with 29.2% of unsteady massflow rate input is also steady,yet the end part of inital liquid sheet of the primary atomization is fluctuating periodically with the amplitude of 1.8 mm and the main frequency of 21 Hz.

V231.2

国家自然科学基金面上项目（51776191,52076136）；国家科技重大专项（J2019-III-0002-0045）