受激液体燃料射流破碎机理及其控制方法的研究

The mechanism of breakup of excited liquid jets and the method to control them are studied thoroughly in theory and experiment in this research project. Based on instability theory, the breakup models of liquid jet under normal and heating conditions are established. The characteristic frequencies of jets, as well as their changing principle and influencing factors, are also obtained. According to the theoretic prediction, using the excited liquid jet system designed by ourselves, the breakup property such as configuration, surface wave and drop size of liquid jets with controllable excitation are investigated in detail by means of several kinds of optical measuring technique. It is proved that the breakup can be accelerated, and the atomization can be improved if the liquid jets are under certain excitations. The study results are very important in understanding this useful phenomenon more thoroughly, and they also provide the theoretic bases for a possible new way to improve the atomization of liquid jet under low injecting pressure... .

通过求解受激液体燃料射流破碎的线性或非线性不稳定模型，获得各种条件下燃料射流系统的破碎主导频率及其变化规律。对射流施加该频率下人为控制的激励，使射流破碎达到类似机械共振的效果，研究其破碎的过程及表面波特性、粒度分布特性、速度场分布特性，掌握受激液体燃料射流的破碎机理，为新型燃料喷射系统和燃烧系统的改进提供理论指导。