中文摘要：

为实现合成双射流技术在水下航行器上的应用,对水下合成双射流开展了流场特性和推力特性的实验研究,分析了水下合成双射流的平均流场特性和推力特性。实验得到了激励器出口不同位置处平均流场流向速度分布情况和水下合成双射流峰值推力随激励器驱动频率的变化规律,并研究了驱动电压幅值和波形对流场及推力的影响。实验发现：存在最佳频率使得水下合成双射流推力达到最大;驱动电压幅值越大,推力越大;不同波形的电压所产生的推力不同,矩形波所产生的推力相对正弦波和三角波所产生的推力更大。

英文摘要：

The flow field and propulsion characteristics of dual synthetic jets （DSJ） in water is investigated using the particle image velocimetry （PIV） system and propulsion measuring system. The results of the experimental investigation reveal the noticeable symmetrical pattern of average flow field created by underwater dual sythetic jets actuator （DSJA） . The influence of DSJA＇s working parameters on flow field characteristics and propulsion of dual synthetic jets in water is studied by changing the driving frequency, amplitude of voltage and voltage waveform. The results shows that there is an optimum driving frequency existed, which generates the maximum propulsion, and the propulsion will increase according to the rise of the amplitude of voltage.