Abstract In the present work, LBO limits for methane-air combustion stabilized by a V-Gutter have been predicted by a hybrid method using numerical simulation and empirical relations. The numerical simulations have been carried out to study the stable methane-air combustion and temperature gradients at exit and recirculation region in a model gas turbine afterburner with a planar V-Gutter as a bluff body for four inlet air pressure conditions and three V-Gutter angles. The calculated average exit gas temperature (AEGT) and the average gas temperature in recirculation region have been used for predicting the blowout conditions. An empirical method based on Feature Section Criterion has been used to determine Fuel-Air Ratio (FAR) at blowout conditions very accurately from the numerically calculated average temperature in the central recirculation zone (CRZ).The predicted Fuel-Air Ratio (FAR) at lean blowout conditions has been compared with the experimental results obtained for the same conditions and are found to be in good agreement.

中文翻译：

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在模型燃气轮机加力燃烧室中使用温度梯度法预测甲烷-空气钝体稳定燃烧的稀燃极限

摘要 在目前的工作中，已通过使用数值模拟和经验关系的混合方法预测了由 V 型檐槽稳定的甲烷-空气燃烧的 LBO 极限。数值模拟研究了以平面 V 形槽作为钝体的模型燃气轮机加力燃烧室出口和再循环区域的稳定甲烷-空气燃烧和温度梯度，用于四种进气压力条件和三个 V 形槽。角度。计算的平均出口气体温度（AEGT）和再循环区域的平均气体温度已用于预测井喷条件。