In this paper, based on the traditional low-frequency self-excited oscillation pulsed jet device, a self-excited aspiration pulsed jet device is designed. For the structural parameters, including the aspiration capacity, impact characteristics, and pulse generation mechanism, the jet impingement is analyzed experimentally under the aspiration and non-aspiration conditions. It was found that, compared to the non-aspiration condition, the maximum aspiration capacity, the increase of instantaneous impact force, and the obvious pulse period, which is between 1 and 2 s, can be obtained under appropriate structural device parameters. The db10 orthogonal wavelet and the empirical mode decomposition methods can decompose instantaneous impact force into time-varying and fluctuating impact forces. However, under different confining pressures, each method has its own advantages in extracting the time-varying impact force. In addition, after aspiration, the confining pressure and target distance have little effect on the pulse frequency of the time-varying impact force, while higher confining pressure and larger target distance result in smaller pulse amplitude. Under different confining pressures and target distances, after aspiration, the time-average impact force at and near the target center increases, while far away from the target center it decreases. Moreover, after aspiration, the fluctuation amplitude and intensity of the fluctuating impact force increase, and the confining pressure has little effect on the pulse frequency. However, higher confining pressure results in smaller fluctuation amplitude, intensity, and energy spectral density. After aspiration, subsonic and supersonic water flows are formed inside the device. In addition, it was found that there is a relationship between the aspiration capacity, the time-variation pressure of the collision body measuring point, and the impact force. Based on this relation, the pulse generation mechanism of the device is revealed.

本文在传统的低频自激振荡脉冲射流装置的基础上，设计了一种自激抽吸脉冲射流装置。对于包括吸气能力，冲击特性和脉冲产生机理在内的结构参数，在吸气和非吸气条件下对射流的冲击进行了实验分析。结果发现，与非抽吸条件相比，在适当的结构装置参数下，可以获得最大抽吸能力，瞬时冲击力的增加以及明显的脉冲周期（1-2s）。db10正交小波和经验模态分解方法可以将瞬时冲击力分解为随时间变化和波动的冲击力。但是，在不同的封闭压力下，每种方法在提取随时间变化的冲击力方面都有其优势。此外，吸气后，围压和目标距离对时变冲击力的脉冲频率影响很小，而围压较高和目标距离较大时，脉冲幅度较小。在不同的围压和目标距离下，抽吸后，目标中心处及附近的时间平均冲击力增加，而远离目标中心的时间平均冲击力则减小。而且，在抽吸之后，波动的冲击力的波动幅度和强度增大，并且围压对脉冲频率影响很小。但是，较高的围压会导致较小的波动幅度，强度和能谱密度。抱负后 亚音速和超音速水流在设备内部形成。另外，发现抽吸容量，碰撞体测量点的时变压力和冲击力之间存在关系。基于这种关系，揭示了设备的脉冲发生机理。