Periodic atomization characteristics of an impinging jet injector element modulated by Klystron effect  

作　　者：Anlong YANG Bin LI Shangrong YANG Yunfei XU Longfei LI 

机构地区：[1]Science and Technology on Liquid Rocket Engine Laboratory, Xi'an Aerospace Propulsion Institute

出　　处：《Chinese Journal of Aeronautics》2018年第10期1973-1984,共12页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 11502186 and 51606138);the National Key Basic Research Program of China;National Key Scientific Instrument and the Equipment Development Projects of China (No. 2012YQ04016408)

摘　　要：An experimental study on the Klystron effect of periodic injection modulated by pressure drop fluctuations on subsequent atomization is conducted. Time-resolved atomization backlit images and atomization Mie scatter images are captured by using the high speed camera. It is found that periodicity of forced atomization relies on pressure drop fluctuation amplitude and phase differences between atomization and pressure drop fluctuations relate to fluctuation frequencies. This feature of periodic atomization induced by Klystron effect corresponds to periodicities and high amplitudes of pressure fluctuations in unstable combustion chambers and chaos and low amplitudes of pressure fluctuations in stable combustions chambers. Drastically periodic varying of gross surface area of droplets with time was shown in Mie scatter images. The importance of periodic impinging jet atomization modulated by pressure drop fluctuations for acoustic liquid propellant combustion instabilities is illustrated.An experimental study on the Klystron effect of periodic injection modulated by pressure drop fluctuations on subsequent atomization is conducted. Time-resolved atomization backlit images and atomization Mie scatter images are captured by using the high speed camera. It is found that periodicity of forced atomization relies on pressure drop fluctuation amplitude and phase differences between atomization and pressure drop fluctuations relate to fluctuation frequencies. This feature of periodic atomization induced by Klystron effect corresponds to periodicities and high amplitudes of pressure fluctuations in unstable combustion chambers and chaos and low amplitudes of pressure fluctuations in stable combustions chambers. Drastically periodic varying of gross surface area of droplets with time was shown in Mie scatter images. The importance of periodic impinging jet atomization modulated by pressure drop fluctuations for acoustic liquid propellant combustion instabilities is illustrated.

关 键 词：ATOMIZATION Combustion stability Impinging jet injector Klystron effect Liquid rocket engine Mie scatter 

分 类 号：V434[航空宇航科学与技术—航空宇航推进理论与工程]