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采用数值计算方法对氧化亚氮/丙烷火炬式点火器的燃烧室和火炬流场特性进行了数值仿真研究,获得了点火器在定混合比工况下工质流量对火炬性能的影响以及定流量工况下余氧系数对火炬性能的影响:在定余氧系数0.350工况下点火器燃烧室压强、火炬功率和点火有效长度与点火器的流量基本呈线性关系,有效火炬长度与实验中所观察到的基本一致;在定流量9 g/s工况下点火器燃烧室压强、喷管出口温度、火炬功率和点火有效长度随余氧系数的不断增加均先迅速增加到最高值后开始逐渐减小,燃烧室压强、喷管出口温度、火炬功率和点火有效长度的计算最高值分别为1.73 MPa,2 823 K,33.14 kW和86.5 mm。
The numerical simulation of the flow field characteristics of the combustion chamber and the torch of nitrous oxide / propane torch igniter was carried out by numerical calculation. The effect of the working fluid flow on torch performance at constant mixing ratio was obtained. Operating conditions of oxygen coefficient on the performance of the torch: 0.350 in the fixed oxygen coefficient igniter combustion chamber pressure, torch power and ignition effective length and the flow of the lighter basically linear relationship between the effective torch length and the experimental center Observed basically the same; at a constant flow rate of 9 g / s operating conditions igniter combustion chamber pressure, nozzle outlet temperature, torch power and ignition effective length with the increasing oxygen coefficient are rapidly increasing to the highest value began to gradually The calculated maximum values for reduction, combustor pressure, nozzle outlet temperature, torch power and ignition effective length are 1.73 MPa, 2823K, 33.14 kW and 86.5 mm, respectively.