摘要
燃油喷嘴的雾化对于解决航空发动机燃烧室问题是至关重要的,为探究某双油路离心式喷嘴的雾化性能,运用两相界面追踪流体体积(Volume of Fluid,简称VOF)方法对该喷嘴的内外部流场进行数值仿真。以双油路离心喷嘴的雾化锥角、质量流率以及液膜厚度作为雾化性能指标,分别模拟出主油路单独供油、副油路单独供油以及主副油路同时供油三种不同工作模式在不同压差条件下喷嘴燃油流动的稳态情况,获得双油路离心喷嘴的雾化性能指标并对其影响规律进行研究。结果显示:数值仿真能较好地模拟出喷嘴的雾化特性,随着压差增大,扩口式主油路单独工作时的雾化锥角减小,平口式副油路单独工作时的雾化锥角增大。当主、副油路同时工作时,雾化锥角随压差的增大而增大且始终处于单路单独工作时的雾化锥角之间;质量流率随着压差的增大而增大且增幅逐渐减缓;液膜厚度在低压区随压差的增大而迅速减小,随后趋于稳定。
Fuel nozzle atomization is critical to solving aero-engine combustion chamber problems.In order to investigate the at-omization performance of a dual-orifice pressure-swirl atomizer,the internal and external flow fields of the nozzle are simulated numerically using the Volume of fluid(VOF)method for tracking the volume of fluid at the two-phase interface.The spray an-gle,mass flow rate and liquid film thickness are taken as indicators of atomization performance to simulate the steady-state fuel flow of the nozzle under different differential pressure conditions in three different operating modes:main fuel line working alone,secondary fuel line working alone,and main and secondary fuel line working together.The aim is to obtain the atomizing perfor-mance indicators of the dual-orifice pressure-swirl atomizer and to study their influence patterns.The results show that numerical simulation can reasonably predict the atomization performance of the atomizer.As the differential pressure increases,the spray an-gle of the flared main fuel line decreases,while the spray angle of flat-ported secondary fuel line increases.When working togeth-er,the spray angle increases with the increase of pressure which is always between main and secondary fuel lines working alone.The mass flow rate increases with increasing differential pressure and the rate of increase decreases gradually.The liquid film thickness decreases rapidly in the low-pressure zone with increasing differential pressure and then gradually becomes stable.
作者
彭真臻
侯力
游云霞
盛鑫
PENG Zhen-zhen;HOU Li;YOU Yun-xia;SHENG Xin(School of Mechanical Engineering,Sichuan University,Sichuan Chengdu 610065,China)
出处
《机械设计与制造》
北大核心
2024年第3期57-61,共5页
Machinery Design & Manufacture
基金
四川省科技厅项目—航空发动机燃油喷嘴智能制造系统关键技术研究(2018GZ0117)。
关键词
双油路离心式喷嘴
数值仿真
雾化性能
雾化锥角
质量流率
液膜厚度
Dual-Orifice Pressure-Swirl Atomizer
Numerical Simulation
Atomization Performance
Spray Angle
Mass Flow Rate
Liquid Film Thickness
