Evaluation of a simplified gross thrust calculation method for a J85-21 afterburning turbojet engine in an altitude facilityA simplified gross thrust calculation method was evaluated on its ability to predict the gross thrust of a modified J85-21 engine. The method used tailpipe pressure data and ambient pressure data to predict the gross thrust. The method's algorithm is based on a one-dimensional analysis of the flow in the afterburner and nozzle. The test results showed that the method was notably accurate over the engine operating envelope using the altitude facility measured thrust for comparison. A summary of these results, the simplified gross thrust method and requirements, and the test techniques used are discussed in this paper.
Document ID
19820051443
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Baer-Riedhart, J. L. (NASA Ames Research Center Edwards, CA, United States)