基于FLUENT的供热末端数值模拟研究

Research on Numerical Simulation of Heating Terminal Based on FLUENT

散热器作为供热末端最常见的一种采暖设备,对其流体流动与换热的研究具有重要意义。采用计算流体力学方法,对供热末端翅片式散热器的传热和流动特性进行了数值模拟研究,分析了该散热器壁面附近的温度场与速度场,获得了散热器翅片表面努塞尔数的变化规律。研究结果表明,在自然对流换热时,散热器壁面附近存在一个薄流体层,冷热空气相遇形成较小的“锋面”,发生扰流脱体,从而使得该区域温度较低,此处换热较强,气体受到黏性与来自热源的热能共同作用,形成了较为对称的流速分布。沿着气流方向,散热器顶端与底端努塞尔数分布均匀,有效解决了暖气片“上热下凉”的现象。

As the most common heating equipment at the end of heating, the research on radiators’ fluid flow and heat transfer is of great significance.The heat transfer and flow characteristics of the fin radiator at the end of heating are numerically simulated by using the method of computational fluid dynamics.The temperature field and velocity field near the wall of the radiator are analyzed, and the variation law of Nusselt number on the surface of the fin of the radiator is obtained.The results show that during natural convection heat transfer, there is a thin fluid layer near the radiator wall.The cold and hot air meet to form a small "front",resulting in turbulent separation, which makes the temperature in this area low, where the heat transfer is strong, and the gas is affected by viscosity and heat energy from the heat source to form a more symmetrical velocity distribution.Along the air flow direction, the Nusselt number at the top and bottom of the radiator is evenly distributed, which effectively solves the phenomenon of "heating up and cooling down" of the radiator.