航空发动机滑油喷嘴尺寸敏感性仿真分析

Sensitivity Simulation and Analysis on Size of Aeroengine Oil Nozzles

某型航空发动机滑油系统为全流量供油系统,不设置溢流流路,因此滑油喷嘴的尺寸直接影响滑油系统供油压力的高低。为了研究喷嘴尺寸公差对滑油系统压力的影响的大小,运用FLOWMASTER软件,首先建立了系统喷嘴的部件仿真模型,根据喷嘴流量检查试验压力、温度、流量的要求,仿真计算出各处喷嘴的上限和下限尺寸,喷嘴计算结果通过某台发动机试验数据校核;然后根据得到的喷嘴尺寸,建立滑油供油系统级的仿真模型,计算评估喷嘴的极限尺寸对滑油系统供油压力的影响。结果表明:喷嘴尺寸的极限尺寸公差对滑油系统供油压力的影响在慢车状态达到57 kPa,在地面最大状态可以达到130 kPa,即极限状态下不同批次发动机滑油系统的试车参数范围差异最大可达130 kPa。计算结果对于发动机滑油系统供油压力范围设定、整机试车问题处理具有指导意义。

The lubricating oil system of an aeroengine is a full-flow oil supply system without spilling flow path,so the size of the lubri⁃cating oil nozzle directly affected the oil supply pressure of the lubricating oil system.In order to study the impact of nozzle size tolerance on the pressure of the lubricating oil system,FLOWMASTER software was used to first establish a component simulation model of the sys⁃tem nozzle.According to the pressure,temperature and flow requirements of the nozzle flow inspection test,the maximum and minimum lim⁃it size of each nozzle were simulated and calculated.The calculation results were verified by engine test data.Then,based on the obtained nozzle size,a system-level simulation model for the lubricating oil supply system was established to calculate and evaluate the impact of nozzle limits size on lubricating oil supply pressure.The results show that the impact of the nozzle limits size on the oil supply pressure of the lubricating oil system can reach 57 kPa at idle state and 130 kPa at ground maximum state,which means that the maximum difference in supply pressure of different batches of engine lubricating oil systems may reach 130 kPa.The calculation results are useful for guiding the setting of the oil supply pressure range of the engine lubricating oil system and engine test troubleshooting.