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Unsteady Flow in Cavitating Turbopumps

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Title Unsteady Flow in Cavitating Turbopumps
 
Creator Kim, J. H.
Acosta, A. J.
 
Subject Caltech Library Services
 
Description Unsteady flow in a cavitating axial inducer pump is analyzed with the help of a simple two-dimensional cascade model. This problem was motivated by a desire to study the effect of unsteady cavitation on the so-called 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 characterisitcs of the cavitation itself. The approaching and leaving flow velocities up- and downstream of the inducer oscillate, and the cavity-blade 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. It represents the primary effect of the fluctuating cavity in the system. The analysis is based on a linearized free streamline theory.
 
Date 1975-12
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://authors.library.caltech.edu/254/1/KIMjfe75.pdf
Kim, J. H. and Acosta, A. J. (1975) Unsteady Flow in Cavitating Turbopumps. Journal of Fluids Engineering, 97 (4). pp. 412-418. ISSN 0098-2202. http://resolver.caltech.edu/CaltechAUTHORS:KIMjfe75 <http://resolver.caltech.edu/CaltechAUTHORS:KIMjfe75>
 
Relation http://resolver.caltech.edu/CaltechAUTHORS:KIMjfe75
http://authors.library.caltech.edu/254/