【摘要】 通过高速摄影技术研究了常压环境下壁面温度及加热功率对撞壁柴油油束发展过程的影响。壁面温度影响附壁油膜的厚度及其沸腾,间接影响了后续撞壁燃油的反弹飞溅。常压下,当壁面温度在340℃~380℃时柴油撞壁油束雾化效果较好。壁面加热功率主要影响撞壁油束对壁面的冷却程度,改变壁面温度,影响后续撞壁油束的雾化。当加热功率达到1.56 W/cm2时油束雾化效果较好,当加热功率为10.12 W/cm2时,撞壁油束能更好地雾化蒸发。更多还原

【Abstract】 The influence of wall temperature and heating power on the development of diesel fuel spray,which was impinging on a heated wall under atmospheric pressure,was investigated by analyzing the spray wall impinging pictures recorded by means of high speed video camera.The wall temperature has influence on the vaporizing and boiling processes of fuel film,therefore it affects the fuel film thickness,the ejection and rebound of later coming fuel.At atmospheric pressure,when the wall temperature was between 340 ℃and 380 ℃,the diesel spray gained a better atomization.The heating power can balance or conquer the chilling of impinging fuel,and changes the wall temperature,and then it affects the spray impinging processes.In this experiment,the wall heating power was set from 1 W/cm2 to 25 W/cm2,and at 1.56 W/cm2 the impinging spray atomized well and when the heating power was 10.12 W/cm2 the spray atomized better.更多还原