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针对装备数控系统的2个型号发动机分别在台架试验和飞行试验中发生的低温起动失败故障,从数控系统半物理试验燃油流量计量宽范围、快响应、高精度的测量要求入手,分析了试验的测量环境与涡轮流量计检定条件要求的环境存在的较大差异,在低温条件下燃油黏度提高,造成了流量系数减小,试验室测量流量示值小于实际流量,低温燃油流量测量准确度存在不可接受的偏差;阐述了发动机低温起动失败故障时供油不足,不能通过当前的流量测量方法进行确认和故障定位,提出了解决高响应低温小流量测量技术问题的研究路径及关键技术的方案和思路,主要方案和思路有:质量流量计串联标定法、常温涡轮流量计串联标定法、体积管串联标定法。
Aiming at the failures of low temperature starting failure occurred in bench test and flight test for two models of engine equipped with numerical control system respectively, starting with the measurement requirements of wide range, fast response and high precision of semi-physical test fuel flow in numerical control system, Of the measurement environment and the turbine flowmeter test conditions require the existence of the environment there is a big difference in the low temperature fuel viscosity increases, resulting in the flow coefficient decreases, the laboratory measured flow indication less than the actual flow rate, low temperature fuel flow measurement accuracy exists Unacceptable deviations. The paper presents the insufficiency of oil supply when the engine failed to start up at low temperature, and can not confirm and locate the fault by the current flow measurement method. The research path and the key technologies for solving the problem of low response and low temperature measurement technology with high response are put forward Ideas, the main programs and ideas are: mass flowmeter series calibration method, room temperature turbine meter series calibration method, the volume tube series calibration method.