Abstract
One of the problem of liquid rocket engine is an axial vibration of turbopump. For its high rotational speed and discharged pressure, many turbopumps use balance piston mechanism to balance axial direction thrust, but sometimes axial vibration occurs because of decreased axial damping. In this report, axial damping characteristic is studied by 1-dimensional model in analytical way, and the effect of axial vibration frequency and bulk-modulus is investigated.
