环境压力大偏差条件下拉瓦尔喷管发动机高空推力的确定

简析了拉瓦尔喷管发动机高空模拟试验的特殊性,提出了大模拟偏差条件下确定和修正拉瓦尔喷管发动机推力的方法.试验结果表明,在保证推力不确定度优于1.0%的条件下,拉瓦尔喷管发动机高空模拟试验的模拟偏差容限约为14%.当设备能力限制或其他特殊原因而采用环境压力大模拟偏差技术时,可以采用本研究的推力系数确定方法确定发动机的推力.

Thrust Determination of an Engine with Laval Nozzle with Large Simulated Ambient Pressure Deviation

The particularity of the altitude simulated test of an engine with Laval nozzle was analyzed in brief.The engine thrust determination and correction in altitude test with large deviation of simulated ambient pressure was put forward.The test result shows that maximum tolerance of the simulated ambient pressure deviation is about 14% under which the engine thrust uncertainty remains less than 1.0%.Where there is a limitation of the test facility capability or for other reasons the large deviation of simulated ambient pressure may occur.The presented method can be used to determine the thrust of the engine with Laval nozzle.