周期供油气动雾化喷嘴喷雾特性试验研究

为满足小型无人机用活塞发动机对航空煤油雾化效果的要求，设计了某新型气动雾化喷嘴并进行了雾化性能试验研究。该喷嘴的结构主要由电磁直射喷嘴、气一液混合室和空气喷嘴3部分组成。试验分别对电磁直射喷嘴和空气喷嘴进行了流量标定，研究了喷油脉宽t1、时间延时t2、喷气脉宽t3和喷气压力对燃油雾化性能的影响，得出喷油脉宽减小、喷气脉宽增加、喷气压力增大均可提高雾化质量，最佳值处于t1=2ms，t2=1ms，t3=5ms时，此时DSH〈10um。

Experimental Investigation on Spray Characteristics of an Air Assisted Fuel Injector Working Periodicall

A new air assisted fuel injector was designed and its experimental investigation of spray characteristics was conducted to satisfy the requirements of good fuel atomization for UAV＇s piston engines. This injector was consists of the electromagnetic fuel injector, the air/fuel interface and the air assisted injector. The flux of the electromagnetic fuel injector and the air assisted injector was metered independently. The important impact factors of fuel spray characteristics were studied, such as the fuel duration tl, the fuel air delay t2, the air duration t3 and the air jet pressure. The results show that reducing t~, increasing t3 and air jet pressure can improve the quality of spray characteristics. The optimal DsM value is less than 10 um when tl=10 ms, t2=1ms, t3=5 ms.