Unsteady flow in cavitating turbopumps
Abstract
Unsteady flow in a cavitating axial inducer pump is analyzed with the help of a simple twodimensional cascade model. This problem was motivated by a desire to study the effect of unsteady cavitation on the socalled POGO instability in the operation of liquid rocket engines. Here, an important feature is a closed loop coupling between several different modes of oscillation, one of which is due to the basic unsteady characteristics of the cavitation itself. The approaching and leaving flow velocities up and downstream of the inducer oscillate, and the cavityblade system participates dynamically with the basic pulsating flow. In the present work, attention is focused on finding a transfer matrix that relates the set of upstream variables to those downstream. This quantity, which is essentially equivalent to cavitation compliance in the quasistatic analyses, is found to be complex and frequency dependent.
 Publication:

ASME Journal of Fluids Engineering
 Pub Date:
 December 1975
 Bibcode:
 1975ATJFE..97..412K
 Keywords:

 Cascade Flow;
 Cavitation Flow;
 Turbine Pumps;
 Unsteady Flow;
 Axial Flow Pumps;
 Flow Velocity;
 Liquid Propellant Rocket Engines;
 Mathematical Models;
 Oscillating Flow;
 Pogo Effects;
 Two Dimensional Models;
 Fluid Mechanics and Heat Transfer