我国北方火炕烟囱中回风洞的数值模拟与分析
Numerical simulation and analysis of wind tunnel of Chinese Kang in Northern Region

火炕采暖在我国北方农村地区非常普遍,为了取得更好的采暖效果,在原有火炕的基础上,以我国北方农村地区火炕中的回风洞(俗称“狗洞”)为研究对象,通过三组实验对烟囱进口处高温烟气的温度和速度进行了测定,依据流体运动中的三大守恒定律,分别建立了三组实验中烟囱内高温烟气流动的平面二维数学模型,利用FLUENT软件对烟囱内烟气的流动状态进行数值模拟,分析了烟囱进口烟气的运动趋势以及回风洞的有无对反风时火炕采暖系统的影响,最后得出结论是回风洞能有效地减弱外界风流的反向作用,阻止了突然自然反风而造成的烟气回流,甚至是火苗外窜的安全隐患。
To achieve better heating effect, the wind tunnel (commonly known as the “dog hole”) of the Chinese Kang in the Northern area was explored. Three experiments were conducted to establish a two-dimensional mathematical model of the flow of high temperature gas in the chimney.The commercial CFD software FLUENT was used to simulate the flow and analyze the inlet flow of the chimney flue and effect of wind tunnel on the heating system of Chinese Kang. Wind tunnel is found to prevent naturally reversed wind effectively and reduce the function of outside wind.