Experimental investigation of critical ventilating coefficient of ventilated supercavity in water tunnel

Ventilation is one of the important technologies in the field of supercavity, and a perfect ventilated supercavity with shape controllable and drag reducible could be gotten only with suitable volumetric flow rate of gas. Ventilation coefficient is the nondimensional coordinates of the flow rate, and the critical ventilation coefficient is corresponded the minimal flow rate to get supercavity. A series of experiments were conducted to examine ventilated cavity physics. With changing the velocity and pressure of the water tunnel, different models and cavitators, a series of ventilated supercavities have been get. The factors affecting the critical ventilation coefficient were studied.