关键词: 航空发动机;高原试验;起动试验;性能;调整

Abstract: In order to solve the problem of starting, a certain type of jet engine on the highland airfields’ ground over an elevation of 3500 meters, which is limit over of 2500 meters, an engine test cell was specially developed for carrying out engine-starting tests. Altogether we finished more than 80 tests using a turbine generator to start an engine first and then the engine would work itself at three different airfields of different heights: 400m, 2800m, and 3650m respectively. Finally we obtained specific features of the engine started at those different starting heights. The experiments indicate that as the height increases from 400m up to 3650m, the turbine generator’s starting power decreases and its rotating speed decreases by 10.6%. The powered rotating speed of the pressure compressor of the turbine generator decreases by 7.64%, but no over-high exhaust temperature appears. When working together, the ignition of the engine is 10 seconds late, and the starting process is 28 seconds longer while the exhaust temperature rises by 160℃. By the adjusting the generator and the engine, the engine starting time is shortened by 6 seconds and the changing rules of the starting parameters are improved so that the engine can be successfully started provided that the parameters do not exceed the limits.

Key words: Aircraft engine;Highland test;Starting test;Performance;Adjustment