超燃冲压发动机性能参数测量不确定度分析

Uncertainty analysis in scramjet performance parameters measurements

以AIAA(AIAA S-071A-1999)推荐的不确定度评估标准,借鉴国内外在风洞试验、航空发动机性能测量、火箭发动机地面试验性能等不确定度分析方面开展的研究工作,建立了符合统计学一般原理的超燃冲压发动机总体性能参数测量不确定度分析和计算方法,开展了超燃冲压发动机总体性能参数测量不确定度进行了分析。结果表明:超燃冲压发动机自由射流试验中系统误差引入的不确定度占主导地位,占总不确定度的90%以上。该研究结果有利于提高超燃冲压发动机总体性能测量精度,为超燃冲压发动机的科学研究和工程设计提供支撑。

Based on wind tunnel test uncertainty assessment of AIAA S-071 A-1999 and the uncertainty study for the wind tunnel testing,aeroengine performance testing and rocket ground testing in the international space power community,an uncertainty analysis method for the scramjet performance testing was established,and corresponding analysis was given.Results showed that the uncertainty induced by the free-jet testing measurement was predominant in evaluating the overall scramjet performance,and the bias limit was over 90% in the uncertainty of scramjet performance parameters measurements.In conclusion,some valuable results and suggestions about the uncertainty of overall performance of scramjet were obtained,and these results can improve the accuracy in scramjet performance parameters measurements,showing prominent application prospect in scramjet development.