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Some experimental results on the L-star instability of metallized composite propellants

Kumar, R. N. (1975) Some experimental results on the L-star instability of metallized composite propellants. AIAA Papers, AIAA 75-226. American Institute of Aeronautics and Astronautics .

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Experimental results are reported on the Lstar instability characteristics of three AP I composite propellants. The metal content of the propellants is 2%, 16%, and 16%. Chuffing, bulk mode oscillations, and time-independent combustion are observed with all three of these propellants. The stability boundary, defined as the boundary between time-independent and unstable combustion, is found to be well defined for two of the propellants in agreement with recognized trends available in the literature on other propellants. The frequency of bulk mode oscillations is presented as a function of the chamber characteristic length. One of the propellants tested has shown bulk mode instability at as high a pres sure as 217 psia. All of these tests were performed in a stainless steel L'~ motor with convenient, interchangeable stainless steel nozzles. The troublesome blockage of the small metal nozzles by the aluminum oxide slag was Overcome in most of these tests by the application of viscous silicone oil on the nozzle surface before each run. This technique is being pursued further, with plans for the inclusion of silicone compounds in propellant formulation, to reduce heat transfer to the inert nozzle.

Item Type:Report or Paper (Report)
Additional Information:© American Institute of Aeronautics and Astronautics, Inc., 1975. This work was supported by NASA under the Jet Propulsion Laboratory Contract NAS 7-100 through a Caltech work order (no. 61496). The author is very grateful to the Solid Propellant Engineering Section at JPL for allowing the use of their facilities. He thanks Professor Fred Culick, Messrs. Warren Dowler, Winston Gin, and Leon Strand for their interest in these studies, and Messrs. Errlilio Sovero, "Scott" Rasmussen, and David Daly for assistance at different stages of this work. He also thanks Mrs. Roberta Duffy for her quick and efficient typing.
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Guggenheim Jet Propulsion CenterUNSPECIFIED
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Official Citation:Some experimental results on the L-star instability of metallized composite propellants KUMAR, R. N., California Institute of Technology, Pasadena, Calif. AIAA-1975-226 American Institute of Aeronautics and Astronautics, Aerospace Sciences Meeting, 13th, Pasadena, Calif., Jan 20-22, 1975, 16 p.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21406
Deposited By: Ruth Sustaita
Deposited On:20 Dec 2010 18:56
Last Modified:26 Dec 2012 12:46

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