燃气通过有机玻璃圆管时的降温特性研究

为了有效地设计燃气发生器降温设备中的有机玻璃管结构,在圆柱坐标系下建立试验用有机玻璃管内壁径向热降解的一维瞬态热传导数学模型;推导有机玻璃内壁面热降解平均温度与内壁面平均升温速率的关系式;建立有机玻璃管中流体的零维流动数学模型;应用建立的数学模型数值模拟出试验工况下有机玻璃圆管内壁在高温燃气流中沿径向热降解的过程,以及有机玻璃管内壁面热降解对燃气流的降温量,为工程设计提供了充分的理论依据.

Temperature Decrease Characteristics of Gas Flowing Through PMMA Cyclic Tubes

To design effectively PMMA tube structures in temperature decreasing equipment for gas generators,one dimensional transient heat transfer mathematical model of PMMA thermal degradation is established in the radial direction of a cylinder coordinate system.The formula between the average temperature of PMMA tube thermal degradation and average rate of temperature increase on the interior wall surface is deduced.The zero dimensional mathematical model of fluid flowing through PMMA tube is established.The thermal degradation process in interior wall through which generator gas fluid flowed in the radial direction is simulated numerically under the condition of experimenting with the above models,the degree of gas temperature decrease for PMMA tube interior wall thermal degradation is simulated.Thus full support is provided for engineering design.