Klystron效应作用下的周期性雾化机理研究

项目名称： Klystron效应作用下的周期性雾化机理研究

项目编号： No.11502186

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 数理科学和化学

项目作者： 杨岸龙

作者单位： 西安航天动力研究所

项目金额： 25万元

中文摘要： 雾化是液体火箭发动机动燃烧过程的重要组成部分，决定了燃料与氧化剂的流量和液滴粒径，直接影响到燃料与氧化剂的蒸发、混合以及燃烧热释放。同时，在液体火箭发动机动燃烧过程中，特别是不稳定燃烧过程中，燃烧室中大幅压力振荡有可能对雾化过程产生影响从而导致klystron效应的出现，进而改变原有的雾化破碎机理和雾化形态。本课题针对离心式和直流撞击式两种液体喷嘴，在喷嘴供应管路上或喷射反压仓上安装扰动装置施加压力激励进行雾化实验，利用光学测量方法，定量测量不同喷嘴在不同频率和振幅扰动下的雾化动态响应，获得周期性雾化动态响应特性的一般规律，探索周期性雾化与不稳定燃烧的内在联系，并验证基于周期性雾化的燃烧不稳定性耦合机制的可行性。

中文关键词： 周期性雾化；；Klystron效应；燃烧不稳定性；激光诱导荧光；PIV

英文摘要： The atomization is an important component of the combustion process of liquid propellant rocket engines，dominating the propellant mass flow rate and droplet size and then having a direct effect on the evaporation and combustion heat release. Meanwhile, in the combustion process of liquid propellant rocket engines, especially the instability combustion process, it is possible that the breakup mechanism and droplet size of atomization are thoroughly changed by the sharp pressure fluctuation leading to ‘klystron effect’ on the atomization process. This research subject focuses on the swirl injectors and impinging injectors and the experimental methods are adopted. The pressure fluctuation is induced by the pulsator mounted on the supply pipe or back pressure nozzle. The dynamic atomization fields at different pressure fluctuation frequencies and amplitudes are measured and recorded by using optical measurement method, obtaining the law of the atomization dynamic characteristics and exploring the intrinsic relationship of the periodic atomization and combustion instability and verifying the availability of the combustion instability mechanism based on the periodic atomization.

英文关键词： Periodic atomization;Klystron effect;Combustion instability;LIF;PIV