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采用CFD方法模拟了排风柜空置、内置不发热体(障碍物)和内置热源体时,排风柜内的气流分布。结果表明,热源体会明显影响柜内气流分布;热源体位于排风柜操作台中间位置时,对来流的阻挡致使其两侧面和背风面产生对称分布的旋涡流,顶部也产生旋涡,不利于污染物排除;热源体散热形成的浮升力有助于驱动气流向上运动,尤其能改善排风柜前壁面附近的气流分布,但改善程度与散热强度有关;热源体紧靠操作口或后壁面时,不利于污染物及时排走。
The CFD method is used to simulate the airflow distribution in the exhaust cabinet when the exhaust cabinet is empty and the built-in non-heating body (obstacle) and the built-in heat source body are built. The results show that the heat source experience significantly affects the airflow distribution inside the cabinet. When the heat source body is located in the middle of the fume hood console, the blocking of the incoming stream produces a symmetrical distribution of vortices on both sides and the leeward side, Pollutants; heat source body cooling formation of the buoyancy helps to drive the upward movement of air flow, in particular, can improve the airflow distribution near the front wall of the exhaust hood, but the degree of improvement and heat dissipation; heat source close to the operating port or the rear wall , Is not conducive to timely discharge of pollutants.