收口型离心喷嘴动态雾化特性仿真  

Dynamic atomization characteristics simulation of a closed centrifugal nozzle

作　　者：杨亚晶[1] 安渊 魏衍举[2] YANG Yajing;AN Yuan;WEI Yanju(School of Aerospace Engineering,Xi'an Jiaotong University,Xi'an 710049,China;School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学航天航空学院,陕西西安710049 [2]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《火箭推进》2025年第1期146-155,共10页Journal of Rocket Propulsion

基　　金：陕西省自然科学基金(2024JC-YBMS-312)。

摘　　要：为深入研究喷嘴动态工作与燃烧振荡的相互传递耦合关系,采用VOF模型对收口型离心式喷嘴的内部流动特征及喷雾状态进行了三维数值研究。研究了气液界面随时间的变化过程及气核的形成与扩展,获得了喷嘴压降与工作介质物性对气核及液膜的形态特征的影响。进一步研究了介质水基于脉动压力和流量脉动下的喷雾特性规律。结果表明:液膜厚度、喷雾锥角和喷雾长度随进口压力脉动而周期性变化,脉动跟随性好,频率一致,而相位受压力脉动响应距离和气动条件的影响而有延迟;相较而言,喷雾参数对流量脉动的响应灵敏性变差,在高频流量脉动下喷雾参数脉动的周期变长。二者对动态喷雾特性的影响关系可为二次雾化特性及喷雾非定常燃烧特性研究提供基础,并可指导喷嘴工况优化及系统稳定性控制。In order to study the coupling relationship between nozzle dynamic operation and combustion oscillation,the VOF model is used to study the internal flow characteristics and spray state of a closed centrifugal nozzle.The changes in the gas-liquid interface over time and the formation and expansion of gas core arestudied,and the influence of nozzle pressure drop and working medium properties on the morphological characteristics of gas core and liquid films are obtained.The characteristics of medium water spray based on pressure fluctuation and mass flow rate fluctuation are further studied.It is found that the liquid film thickness,spray cone angle and spray length change periodically with the inlet pressure fluctuation.The fluctuation follows well and has the same frequency,while the phase is delayed due to the influence of pressure fluctuation response distance and aerodynamic conditions.In contrast,the sensitivity of spray parameters to mass flow rate fluctuation becomes worse,and the period of spray parameter fluctuation become longer under high-frequency flow fluctuation.The research results can provide a basis for the study of secondary atomization characteristics and spray unsteady combustion characteristics,and can also guide the optimization of nozzle working conditions and system stability control.

关 键 词：离心式喷嘴 两相流模拟 压力脉动 液膜厚度 喷雾锥角 

分 类 号：V235.21[航空宇航科学与技术—航空宇航推进理论与工程]