燃气轮机罩壳内的流动阻力和传热特性计算

Calculation of Resistance and Heat Transfer Characteristics of Enclosure for Gas Turbine

为了建立具有异型结构和复杂流动过程的燃气轮机罩壳系统内部阻力和传热特性的工程计算模型,采用Fluent软件结合UDF函数对罩壳内三维流场和传热特性进行了数值模拟,并用燃机电厂实测数据进行了验证。采用数值模拟结果对异型结构通道的阻力工程计算公式和燃机本体保温层外的对流传热系数分别进行了修正。修正后的工程算法结果表明保温层外表面的温度与实测值误差在10%以内。本文建立的工程算法为燃气轮机罩壳系统和保温材料的国产化设计提供了参考依据。

In order to build the engineering algorithm model about flow resistance and heat transfer performance of enclosure system for gas turbine, which has irregular structure and complicated flow characteristic, Fluent is used to simulate the 3 - D flow and heat transfer characteristic. Practical measurement data of gas turbine power plant are used to verify the calculated data from the engineering algorithm model. The flow resistance formula of irregular structured tunnel and the heat transfer coefficient of the outer surface on insulating layer are modified respectively by the results of numerical simulation. The error between the measured values and the results of the modified algorithm is within 10%. The modified algorithm can provide reasonable reference for localization design of enclosure system of gas turbine.