The impact test of self-excited inspiration pulse jet device was conducted by using homemade jet experiment platform. The time-varying process of typical measuring points pressure and target center impact were measured. The water-gas flow process inside the device has been recorded with a high-speed digital camera. The pulse effect of typical measuring point pressure and impact was analyzed under different structural parameters and operation parameters. The relationship among typical measuring points pressure, impact pulse effect and water-gas flow process was studied. The result shows that cavity length, nozzle diameter, working pressure and confining pressure had obvious influence on inspiration capacity. Cavity length and under nozzle diameter had significant influence on collision body measuring point pressure pulse effect, impact time-averaged value and pulse effect, and there were optimal structure parameters that make inspiration capacity, impact time-averaged value maximize and pressure pulse effect best. Work pressure and confining pressure had greater influence on the impact time-averaged value and pulse effect. The gas-water rotating vortex inside the cavity was formed after inspiration. There existed obvious corresponding relation between the gas-water rotating vortex and pulse effect of the collision body measuring point pressure and impact, so the reason of pulse jet was explained.
