摘要
利用PDA(相位多普勒测速仪)对典型工况下压力雾化喷嘴的雾化特性进行了实验研究,利用Gauss分布函数表征雾化参数的径向分布,利用衰减指数函数表征雾化参数极值的轴向分布。总结出该喷嘴的雾化特性函数模型,模型的计算结果与实验结果相对误差不超过10%。将该雾化函数模型应用于同向双旋流燃烧室中,对模拟的燃油燃烧模拟的离散相设置,分析了燃烧室内的火焰分布特性,验证了燃烧模拟中应用自定义雾化特性模型的可行性。相比初始雾化特性为均匀分布设置,该函数模型设置下燃烧室的温度场与流场的变化趋势大体一致,1 800 K高温区域径向缩小20%且向燃烧室下游偏移0.01 m,回流区则向下游偏移约0.025 m。
By using a phase Doppler anemometer( PDA),experimentally studied were the atomization characteristics of a pressurized atomization nozzle under the typical operating conditions. The Gauss distribution function was employed to represent the radial distribution of the atomization parameters and the exponential attenuation function was used to represent the axial distribution of the extremum values of atomization parameters. On this basis,an atomization characteristic model for the nozzle was established and the relative error between the results obtained by using the model in question and the test data was not in excess of 10%. The atomization function model in question was applied in a dual swirling combustor in a same direction to perform a discrete phase setting of the data of the fuel oil atomization characteristics simulated and on this basis,the flame distribution characteristics inside the combustor were analyzed.Therefore,the feasibility of an application of the self-defined atomization characteristic model in combustion simula-tion was verified. It has been found that compared with the setting of the initial atomization characteristics being uniformly distributed,the variation tendency of the temperature and flow field inside the combustor calculated by using the function model under discussion is roughly identical. The high temperature zone at a temperature of 1800 K becomes small by 20% along the radial direction and shifts by 0. 01 m to the downstream of the combustor. In the meantime,the return flow zone moves by 0. 025 m to the downstream of the combustor.
出处
《热能动力工程》
CAS
CSCD
北大核心
2015年第6期865-872,968-969,共8页
Journal of Engineering for Thermal Energy and Power
关键词
PDA
雾化模型
Gauss分布
衰减指数函数
双旋流燃油燃烧
数值计算
phase Doppler anemometer(PDA),atomization model,Gauss distribution,exponential attenuation function,dual swirling fuel oil combustion,numerical calculation
