航空发动机零组件流量测试系统误差控制研究

Study on systematic error control of airflow test for aero-engine parts and assemblies

为提高航空发动机零组件空气流量测试结果的准确性、控制和降低流量测试系统误差,以某型发动机高压涡轮前内喷嘴支承组件的测试为例,对空气流量测试相关的气源、设备、夹具等系统性因素进行逐一分析和研究。研究结果表明:通过对气源、设备、夹具进行综合控制,可以有效地控制和降低流量测试误差。其中,应对气源进行过滤、干燥,使测试气体的杂质颗粒直径≤1μm,残留油份含量≤1×10^(-6),露点≤-2℃。设备测量误差可依据推导出的测量误差计算公式通过正确分配和选择各测量器件的精度进行控制。测试夹具应考虑设计集气腔和缓冲板,并使用恰当的密封方法。

In order to improve the accuracy of airflow test results for aero-engine parts and assemblies, and to control and reduce the airflow test systematic error, the airflow test of a high press turbine front inner support nozzle of an aero-engine was taken for example to analyze and study the related systematic factors such as air supply, equipment and fixture. The final results show that the error of airflow test results could be effectively controlled and reduced through comprehensively controlling the air supply, the equipment, and the fixture. Air supply should be filtered and dried to make the particulate matter ≤1 μm, the content of residual oil ≤1×10-6, the dew point ≤-2 ℃. Equipment measuring error could be controlled through correctly assigning and selecting the accuracy rating of the measuring devices based on the derived measuring error calculating formula. Designing of a plenum and a baffle should be considered for test fixture, and proper sealing methods should be used.