某型航空发动机燃烧室煤油改柴油燃烧特性研究

Study on Combustion Characteristics of an Aeroengine Combustion Chamber with Kerosene into Diesel

燃料物性对燃烧室燃烧特性有着非常大的影响,是研究设计中首要考虑的参数。借助数值计算方法,采用Fluent稳态压力求解器、P1辐射模型和涡耗散模型(EDM)对某航空发动机燃烧室在巡航工况和最大工况下煤油与柴油两种燃料的燃烧特性进行计算及对比研究,得到该燃烧室使用航空煤油(RP-3)和0~#柴油的热态流场、空气流量分配、温度场、出口温度分布、污染物排放及头部燃油蒸发量。结果表明:在相同工况下,当该燃烧室的燃料由航空煤油改为0~#柴油后,其热态温度场分布基本一致,流量分配最大差异在0.45%之内,燃烧效率降低约4.3%,NO和碳烟粒子排放量相当,出口温度分布和总压损失差异分别在1.0%和4.1%之内。

The fuel property is of a great influence on the combustion characteristics of the combustion chamber,which is the first concern in the design of the combustion chamber.The combustion characteristics and comparative study for an aeroengine with kerosene and diesel oil are studied by using the Fluent steady pressure solver,P1 radiation model and eddy dissipation model（EDM）in cruise condition and the maximum conditions.The flow field,flow distribution,temperature field,total pressure loss,outlet temperature distribution,pollutant and fuel evaporation process of combustion chamber are obtained with aviation kerosene（RP-3）and 0# diesel oil.The results indicate that when the aviation kerosene is changed to 0# diesel oil,in the same condition,the distribution of hot temperature field is consistent and the maximum difference of flow distribution is within 0.45%：the combustion efficiency is reduced by about 4.3% and NO and soot emissions are equal.The difference of the out temperature distribution and total pressure loss of the outlet are 1.0% and 4.1% respectively.