Abstract
For experimantally investigation of themodynamic effect on cavitation, it is of value to observe the cavitation in cryogenic flow, but the visualization is difficult. For this reasen, we tried to estimate the cavitating region in liquid nitrogen based on unsteady pressure distribution. Unsteady pressure was measured by placing sensors on casing of inducer. By this method, it succeeded in grasping of the cavitating rejion in relation to cavitation number. The comparison of the expriments in liquid nitrogen and in cold water allowed us to estimate theamplitude of the themodynamic effect. Consequently, it turns out that the amplitude of themodynamic effectis changing with the cavity length. The amount of temperature depression increases rapidly when the cavity extends over the throat.
