正癸烷作为航空煤油雾化过程代理燃料的研究

对航空煤油和单组份碳氢燃料正癸烷的雾化性能进行实验测试,研究在部件燃烧特性验证阶段,正癸烷作为航空煤油雾化过程代理燃料的可行性.结果表明:在室温条件下,经过旋流器的气流压力降分别为0,500,2000Pa,供油压力从0.1~1.0MPa间隔0.1MPa均匀变化,使用马尔文激光粒度仪测量旋流器下游点火器位置处两种燃料的雾化索太尔平均直径.对于两种燃料,供油压力大于0.5MPa后,SMD变化缓慢,此时两种燃料的雾化过程基本完成,雾化索太尔平均直径均介于30~45μm之间.相同气流压力降下,正癸烷的雾化SMD比航空煤油稍大,这与其更高的黏度和表面张力有关;供油压力大于0.5MPa后,两种燃料的雾化SMD非常接近.在对实验数据进行拟合分析的基础上,获得了航空煤油和正癸烷在旋流中的雾化SMD经验关系式,发现拟合系数的相对差异约为7%,可将正癸烷经过适当的修正之后做为航空煤油雾化的代理燃料. 

Research on n-decane as surrogate fuel of aviation kerosene in atomization process

Atomization characteristics of aviation kerosene RP-3 and single component hydrocarbon fuel n-decane were tested to study the feasibility of n-decane as an atomization surrogate fuel of aviation kerosene in component testing stage.Results showed that, at room temperature, atomization Sauter mean diameter (SMD) located at igniter orifice of the two fuels was measured using Malvern laser particle size measurement system when the air pressure drop through the swirler was 0, 500, 2000Pa, and the fuel pressure varied from 0.1MPa to 1.0MPa by 0.1MPa uniformly.SMD of the two fuels decreased slowly when fuel pressure increased to more than 0.5MPa, showing that atomization process of the two fuels basically completed, and the atomization SMD was between 30-45μm.When the air pressure drop was the same, the atomization SMD of n-decane was slightly larger than that of aviation kerosene due to the slightly larger viscosity and surface tension.When the fuel pressure was more than 0.5MPa, physical properties of the fuels and aerodynamic force around the atomization could be ignored, and the atomization SMD of the two fuels was very close.Further, the experimental data were analyzed and fitted to obtain the empirical relationship of atomization SMD of the two fuels in swirl flow.The relative difference of the fit coefficients was about 7%, so, n-decane could be used as the physical surrogate fuel of aviation kerosene atomization after appropriate correction.