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cooling of rocket thrust chambers with liquid oxygenRocket engines using high pressure liquid oxygen (LOX) and kerosene (RP-1) as the propellants have been considered for future launch vehicle propulsion. Generally, in regeneratively cooled engines, the fuel is used to cool the combustion chamber. However, hydrocarbons such as RP-1 are limited in their cooling capability at high temperatures and pressures. Therefore, LOX is being considered as an alternative coolant. However, there has been concern as to the effect on the integrity of the chamber liner if oxygen leaks into the combustion zone through fatigue cracks that may develop between the cooling passages and the hot-gas side wall. To address this concern, an investigation was previously conducted with simulated fatigue cracks upstream of the thrust chamber throat. When these chambers were tested, an unexpected melting in the throat region developed which was not in line with the simulated fatigue cracks. The current experimental program was conducted in order to determine the cause for the failure in the earlier thrust chambers and to further investigate the effects of cracks in the thrust chamber liner upstream of the throat. The thrust chambers were tested at oxygen-to-fuel mixture ratios from 1.5 to 2.86 at a nominal chamber pressure of 8.6 MPa. As a result of the test series, the reason for the failure occurring in the earlier work was determined to be injector anomalies. The LOX leaking through the simulated fatigue cracks did not affect the integrity of the chambers.
Document ID
19900013289
Document Type
Conference Paper
Authors
Armstrong, Elizabeth S.
(NASA Lewis Research Center Cleveland, OH, United States)
Schlumberger, Julie A.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Subject Category
SPACECRAFT PROPULSION AND POWER
Report/Patent Number
NASA-TM-103146
E-5498
NAS 1.15:103146
AIAA PAPER 90-2120
Meeting Information
Joint Propulsion Conference(Orlando, FL)
Funding Number(s)
PROJECT: RTOP 590-01-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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