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Dynamic Response to Global Oscillation of Propulsion Systems with Cavitating Pumps

Hori, Shusuke and Brennen, Christopher E. (2011) Dynamic Response to Global Oscillation of Propulsion Systems with Cavitating Pumps. Journal of Spacecraft and Rockets, 48 (4). pp. 599-608. ISSN 0022-4650. doi:10.2514/1.51945.

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A time-domain model was developed to evaluate the dynamic response of pumping systems in the accelerating environment of rockets with a focus on cavitation. The model was first verified by comparing the results with measurements in ground-based tests of an LE-7A rocket engine. In these tests, various resonances occurred and levels of pump cavitation or incorporation of an accumulator altered them. The model results simulated the test data well, matching both the frequency and the amplitude. The test and model results also demonstrated the stability of the LE-7A propulsion system within nonaccelerating environments. Then, the model was used to examine the response of the propulsion system in accelerating frames; sinusoidal vehicle oscillations over a range of frequencies were explored. Under noncavitating conditions, the pressure amplitudes within the propulsion system did not substantially exceed the quasi-static acceleration head response ρah. However, under cavitating conditions (σ = 0.02), the same accelerations produced violent responses with pressure and flow amplitudes about 2 orders of magnitude greater than in noncavitating conditions. The obvious conclusion is that vehicle oscillations can cause substantial pressure and flow amplitudes, particularly when the pump is cavitating, even if the ground-based tests and the calculations in static frames indicate stable and well-behaved responses.

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Additional Information:© 2011 by the American Institute of Aeronautics and Astronautics, Inc. Received 9 August 2010; revision received 7 February 2011; accepted for publication 10 April 2011. The first author wishes to acknowledge the support of Makiko Hori, during his visit to the California Institute of Technology, and the Japan Aerospace Exploration Agency.
Issue or Number:4
Record Number:CaltechAUTHORS:20110907-073103948
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Official Citation:Dynamic Response to Global Oscillation of Propulsion Systems with Cavitating Pumps pages 599-608 (Article) Shusuke Hori; Christopher E. Brennen Journal of Spacecraft and Rockets (0022-4650) 2011 vol. 48 no. 4
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25237
Deposited By: Ruth Sustaita
Deposited On:07 Sep 2011 14:54
Last Modified:09 Nov 2021 16:31

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