492Q单点电喷汽油机燃油超声雾化换能器设计

DESIGN OF ULTRASONIC ATOMIZATION TRANSDUCER FOR USE WITH SINGLE POINT INJECTION GASOLINE ENGINE 492Q

本文介绍一套自行研制的单点电喷汽油机燃油超声雾化装置 ,它由一个电子振荡器和一个超声雾化换能器组成 ,利用后者产生的超声振动 ,将燃油破碎成微小油滴 ,使其得到充分雾化。本文根据 4 92Q汽油机各工况的喷油量和汽油完全燃烧所要求的油滴直径 ,计算出超声振动的频率和功率 ;根据超声原理和单点电喷节气门阀体的结构确定了超声雾化换能器的材料、结构形式和几何尺寸 ,并进行了有限元分析以避免换能器在汽车行驶过程中发生共振。

The paper describes an electronically controlled fuel atomization apparatus for use on single point injection engines 492Q, consisting of an electronic oscillator and an ultrasonic atomization transducer. The transducer vibrates ultrasonically to break up the fuel into fine droplets. Based on the engine's rate of fuel flow and the desired fuel droplet diameter for complete combustion, the frequency of ultrasonic vibration and its power rating are calculated. The material, structure and dimensions of the transducer are determined according to ultrasonic atomization theory and fuel injection nozzle configuration. Finite element analysis is carried out to avoid possible resonance of the transducer from excitations originating in the vehicle.