燃油乳化液射流的喷雾特性

Atomizing properties of emulsified oil jet

分析了燃油乳化液射流的发展模型和游离水的微爆炸特性,提出空化对射流的破坏作用能使射流雾化角发生改变,因此判定乳化燃油雾化效果的一个重要准则是雾化角。在给定容积的容器内充入氮气,采用遮盖式喷嘴,利用高速摄影机分析了无水柴油和具有不同含水量的柴油乳化液射流在高压脉冲喷射气体介质时游离水滴发生微爆炸的喷雾特性。理论和实验研究表明:燃油中含有大量的微小水滴降低了卸载时射流断裂的动力强度,使其具有更强的分散性。柴油乳化液比无水柴油能喷射出更多的体积,射流宽度变大,喷射的雾化角增大,当乳化液中水的含量为10%时,喷射雾化角达到最大值。

Development model of emulsified oil jet and micro-explosion properties of water drops are analyzed,cavitation effect can change the jet atomizing angle,therefore,an important guideline to describe oil jet atomization is atomizing angle.Absolute diesel fuel and different moisture content emulsified diesel fuels are researched by high-speed camera system from the experiment for studying the atomizing properties of water drops when high-voltage impulse injects the gas medium.The theory and experimental results show that lots of water drops of emulsified oil reduce jet dynamic strength when the jet unloads,so it has stronger dispersed properties.Emulsified diesel fuel can spray more capacity than absolute diesel fuel,the width of jet is greater and the spraying atomizing angle increases.When the moisture percent of emulsified oil is 10%,the atomizing angle can get to the maximum.