| Abstract | Some J85-CAN-15 turbojet engines, installed in CF-5 aircraft, have experienced compressor stalls and flameouts in flight. In the absence of altitude test facilities, a program was agreed upon by the Canadian Forces and the National Research Council to conduct a series of comparative tests on “new production series” as well as “old production series” engines, both with and without histories of malfunctioning. The sea-level-static test program included steady-state and transient runs with undistorted intake flow. Also, special tests were conducted with increasingly distorted intake flows to gauge the relative stall propensity of the various engines.
This report documents the testing of J85-CAN-15 engine Serial Number 8727. This engine was a zero-hour “new production series” engine and these test results will serve as a reference for comparative analysis of experimental data from this and other engines to be tested later in the program. The test results are presented under three major categories, viz:
a) steady-state tests with undistorted intake flow
b) transient tests with undistorted intake flow
c) steady-state and induced stall tests with distorted intake flow.
Discussion and interpretation of these data includes comparison of category a) experimental results with performance and operational characteristics predicted in previous analytical studies using the engine designer’s Status Deck computer program. Comparisons are also made of steady-state and transient characteristics with undistorted intake flow using results from categories a) and b). Finally, some understanding of the engine’s behaviour during induced compressor stall has been obtained by comparison of results from categories b) and c). |
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