燃油流量调节器流量不稳故障分析与改进

Failure Analysis and Improvement of Fuel Flow Regulator

燃油流量调节器是航空发动机主燃油系统的核心部件,为发动机提供动力。本研究提到的燃油流量调节器是通过感受发动机转速、油门杆角度、高压压气机进、出口压力、高压压气机出口温度、涡轮后燃气温度等输入信号调节产品内部可变计量柱塞套筒组件和加速控制器套筒组件的型孔开度,调整高压泵随动活塞两端压力差,从而调整高压泵斜盘角度,最终改变燃油流量。燃油流量调节器在试车过程中经串装发动机后仍存在流量不稳故障,通过分析计算燃油流量调节器的可变计量柱塞套筒组件、P3P压力变化、飞重、温度补偿机构、转速控制套筒计量刃边等对流量变化的影响,并通过产品试验及与发动机配试,确认了燃油流量调节器流量不稳性能故障的原因。通过细化可变计量柱塞工艺方法提高表面光洁度、调整飞重装配侧隙提高抗污染能力、控制温度补偿机构及转速控制套筒部分零组件的形位公差提高运动灵活性以及明确燃油流量调节器再调活门的清洗周期等措施,可提高燃油流量调节器流量稳定性。

Fuel flow regulators are core components of the main fuel systems in aero-engines ; they supply engine with power. A fuel flow regulator was found to have unstable flow. This paper analyzed and calculated the effect of variable metering plunger sleeve assembly, the variable pressure （P3P） , fly weight, temperature compensation mechanism, edge of speed control sleeve metering on flow change. By product testing and engine equipment-testing, the cause of the failure of the fuel flow regulator was confirmed . By means of refining the variable metering plunger to improve the surface finish, adjusting the fly weight assembling clearance to improve the anti-contamination ability, controlling the form tolerance between the temperature compensation mechanism and some components of the speed control sleeve to improve the operational flexibility, and determining the clearing cycle for the transferred valve of the fuel flow regulator to improve the fuel flow stability, the flow stability of the fuel flow regulator can be improved.