高温空气燃烧炉内耦合传热的数值模拟

Numerical Simulation of Coupled Heat Transfer in HiTAC Furnace

用自行开发的三维湍流流动、燃烧、辐射传热和NOx湍流生成的计算程序,用离散坐标方法(DOM)模拟炉内的辐射传热并与其它传热方式相耦合,与各个输运方程共同求解,对燃烧室内的温度场进行了数值模拟.通过改变高温空气的预热温度,数值分析了高温空气燃烧炉内采用燃气直接喷射技术(FDI)的温度分布特性,检验了所采用的耦合数值模拟技术的有效性.模拟计算结果表明,提高空气预热温度,炉内温度的峰值相应增大,温度梯度降低,温度分布更均匀,火焰更长.相关的实验结果与数值预报的结果对比表明了相一致的规律.

A three-dimensional numerical simulation of the temperature field in high temperature combustion furnace is performed using a method of discrete ordinate to solve the radiation transfer and transfer coupled equations. A computer program of flow, combustion, heat transfer and NOx turbulent formation is developed. The temperature distribution of Fuel Direct Injection (FDI) is numerically analyzed at different preheated air temperature and the validity of the applied numerical simulation is tested. The simulation results show that when preheated air temperature increases the maximum temperature gets larger, the temperature gradient becomes lower and the flame length longer. They are in agreement with experiments.