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方孔蜂窝蓄热体内复杂传热的三维CFD研究
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Abstract:
采用ANSYS Fluent软件建立了方孔蜂窝陶瓷蓄热体内非稳态流固耦合传热的单元流道模型；以低热值燃料蓄热式燃烧为背景，对蓄热体内烟气、空气与骨架间复杂传热进行了三维数值模拟；预测了各种蓄热体长度下空气预热温度、蓄热体效能和压力损失等热流体性能，并据此进行结构优化；在此基础上研究蓄热体变流量条件下的传热和流动特性。此外，借助温度云图对蓄热式传热机理进行了分析。
The unit channel model of square opening ceramic honeycomb regenerator is constructed with ANSYS Fluent for the unsteady conjugate heat transfer. The three-dimensional simulation on the complex heat transfer between the hot flue gas or cool air and solid skeleton in regenerators is made for the application of regenerative burners with low-caloric fuels. The thermal and hydraulic performances such as the preheated air temperature, regenerator effectiveness and flow re-sistances are predicted and the regenerator length is optimized. Besides, the performance char-acteristics at various flow rates are researched on the optimal regenerator. Moreover, the regen-erative heat transfer mechanism is analyzed with temperature contours.
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