激波及诱导的高速气流抛撒柴油油膜的实验研究

摘要

The dispersion principle and atomization process of four kinds of diesel fuel films induced by shock wave and high-speed airflow was studied,employing a vertical shock tube.The pressure and velocity of the shock wave,before and after reaching the diesel fuel films,were measured by a pressure acquisition system.The dispersion process of the diesel fuel films was recorded by a shadow-graph system.The experimental results show that the shock wave in 1.12 Mach was weakened to a high-speed airflow after impacting on the diesel fuel films.The atomization effect of diesel fuel film 1 and 2 is better,while its viscosity is low.In contrast,diesel fuel film 3 and 4 with a higher viscosity were broken up into big pieces and silks after the dispersion process.It can also be concluded that the diesel fuel films with a lower viscosity have a larger initial dispersion velocity,whereas it will be reduced faster.Apparently,the diesel fuel films with a higher viscosity have a smaller velocity because they have an obstructive effect on the aerodynamic force.Moreover,the corresponding dispersion distance and velocity decreased with the increase of the viscosity.%采用立式激波管装置,研究了激波及诱导的高速气流抛撒4种柴油油膜的规律及其雾化过程.运用压力测试系统得到了激波作用油膜前后的压力、波速的变化,并通过阴影成像系统记录了油膜的抛撒情况.实验结果表明:马赫数约为1.12的激波作用4种油膜后激波均衰减为高速气流,并且黏度较小的1、2号油膜雾化效果较好,而黏度较大的3、4号油膜抛撒后呈液块、液丝状.黏度较小的油膜初始抛撒速度大,但抛撒速度衰减较快,而黏度较大的油膜对气动力的阻碍作用更大,所以初始抛撒速度较小,且抛撒的距离和速度随黏度的增大而减小.