涡轮流量传感器油耗测量及流阻特性实验分析

Fuel consumption measurement and flow resistance characteristics experimental analysis of turbine flow sensor

发动机油耗测量采用涡轮流量传感器切断油管安装测量,通过液体流动带动叶轮旋转的速度大小反映流体流速。由于某些部位的燃油管路直径小,催动叶轮转动会减小供油压力,影响发动机供油速率,严重时会阻滞发动机油管造成飞行质量事故。该文首先引入计算双转子燃油流量的关键参数K因子,并结合上下游转子频率和流量之间的关系,得出涡轮流量传感器油耗测量原理及其流阻特性计算方法;再以其研究结果为基础,搭建流阻特性实验测试平台,合理设计不同流量给定值的实验点,并分析燃油管道转接点前后压力值、实际管道压差以及实际流量响应曲线,得到影响流阻系数各因素之间的作用规律,为加装在小口径燃油管路的流量传感器选择提供指导。

Engine oil consumption measurement uses turbine flow sensor to shut off oil pipe and install,reflects fluid velocity from the velocity that liquid pressure drives impeller rotation.Considering that oil pipe diameter is small,driving the impeller rotation will reduce the pressure of oil supply,affect engine oil supply rate,even block the engine oil pipe to cause flight quality accidents.In this paper,the key parameter K factor,which is used to calculate the fuel flow rate of the twin rotors,is firstly introduced.Based on the relationship between the frequency and flow rate of the upstream and downstream rotors,the measurement principle of fuel consumption of the turbine flow sensor and the calculation method of flow resistance characteristics are obtained.Based on the research results,an experimental test platform for flow resistance characteristics is built to reasonably design experimental points with different given flow values,and the pressure value before and after the fuel pipeline connection point,the actual pipeline pressure difference and the actual flow response curve are analyzed to obtain the law of function of various factors affecting the flow resistance coefficient,to provide guidance for selecting the flow sensor installed in the small diameter fuel line.