Unsteady Flow in Cavitating Turbopumps
CaltechAUTHORS
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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 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 characterisitcs 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. It represents the primary effect of the fluctuating cavity in the system. The analysis is based on a linearized free streamline theory.


Date 
197512


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. 412418. ISSN 00982202. 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/ 
