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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。实验结果表明: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。
In order to obtain a better heating effect, the heating of the heated kang is very popular in rural areas in the north of our country. Based on the original kang, the return air holes (commonly known as “dog holes”) in the kang of the northern rural areas of our country are studied. Three sets of experiments were carried out to determine the temperature and velocity of the high-temperature flue gas at the inlet of the chimney. According to the three conservation laws in fluid motion, three-dimensional planar two-dimensional mathematical model of high temperature flue gas flow in the chimney was set up respectively. The flow of flue gas in the chimney was numerically simulated by FLUENT software. The trend of gas movement and the presence or absence of return air holes on the heating system when the heated kang heating. The experimental results show that the return air tunnel can effectively weaken the reverse effect of the external air flow, prevent the flue gas backflow caused by sudden natural anti-wind, and even the hidden danger of fire.