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针对航空发动机砂尘吸入物定量监测的问题,提出了基于进气监测系统(IDMS)的砂尘吸入物质量浓度监测及总量估算方法。借助ANSYS电磁场仿真软件建立了IDMS系统有限元模型,实现对发动机实际工况下的砂尘吸入物的静电场模拟,研究确定砂尘吸入物质量浓度、荷质比等宏观参数与IDMS监测信号的关系。研究发现所建立的IDMS有限元模型获得的传感器特性与前期试验获得的结论一致,静电信号随吸入颗粒物浓度的变化与试验中实测信号的变化趋势一致,为基于IDMS信号的砂尘吸入物定量监测和评估提供理论依据。仿真试验表明,荷质比一定的情况下IDMS感应电荷量与砂尘浓度呈线性增长关系,通过IDMS感应电荷信号可实时监测发动机砂尘吸入物质量浓度,并可进一步累积估算一段时间内砂尘吸入物总量,最终总量估计误差不超过4%。
Aiming at the problem of quantitative monitoring of aerosols inhalation by sand and dust, a method of monitoring inhalation mass concentration based on air intake monitoring system (IDMS) is proposed. The finite element model of IDMS system was established by using ANSYS electromagnetic field simulation software to simulate the electrostatic field of sand and dust inhalation under the actual working conditions of the engine. The macro parameters of sand and dust inhalant, such as mass concentration, relationship. It is found that the sensor characteristics obtained by the established IDMS finite element model are consistent with those obtained in previous experiments. The change of electrostatic signal with the concentration of inhaled particles is in accordance with the trend of the measured signal in the experiment, and the quantitative monitoring of inhalation dust based on IDMS signal And provide a theoretical basis for assessment. The simulation results show that the charge density of IDMS increases linearly with the charge-to-charge ratio. The IDMS induced charge signal can be used to monitor the mass concentration of the engine dust inhaler in real time and to further accumulate the dust The total amount of inhalation, the final total estimated error does not exceed 4%.