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为探究先进旋涡燃烧室内湍流燃烧流动特性,应用预混燃烧模型,对燃烧室内燃烧及流动过程进行了数值模拟。得到了燃烧室内温度场及流场的分布情况。分析了不同燃气当量比、燃气速度和燃气温度对燃烧室预混燃烧流动的影响规律。结果表明:燃烧室内凹腔及后钝体回流区是主要燃烧区域,主燃区可形成均匀对称的旋涡对;不同工况参数对燃烧室内温度、组分和流场分布有影响。凹腔内温度随进气速度增大而增加,燃烧室内温度和出口径向温度随燃气温度增大而增大,且在不同工况下,凹腔内都能维持较高的点火温度。
In order to explore the turbulent combustion flow characteristics in the advanced vortex combustor, the premixed combustion model was used to simulate the combustion and flow in the combustion chamber. The distribution of temperature field and flow field in the combustion chamber was obtained. The influence of different gas equivalence ratio, gas velocity and gas temperature on the premixed combustion flow in the combustion chamber was analyzed. The results show that the recirculation zone in the combustion chamber and the bluff body are the main combustion zones, and the main combustion zone can form symmetrical vortex pairs. Different operating parameters have influence on the temperature, composition and flow field distribution in the combustion chamber. The temperature in the cavity increases with the increase of the gas velocity. The temperature in the combustion chamber and the radial temperature at the outlet increase with the increase of the gas temperature. Under different conditions, the ignition temperature in the cavity can be kept high.