热源体对排风柜内气流分布影响的数值研究
Numerical investigation into influence of heating obstacle on airflow distribution inside fume hoods
摘要：
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。
Abstract：
Using CFD method simulates airflow distribution inside fume hoods for the empty hood, the hood with an obstacle and the hood with a heating obstacle, respectively. The results show that a heating obstacle has a significant effect on the airflow distribution inside the fume hood. For the situation that the heating obstacle is placed in the middle of operating floor of the fume hood, the blocking effect to the incoming airflow produces symmetrically distributed eddies at the two sides and leeward side around the heating obstacle, and the eddies on the top, which is not beneficial to exhaust the contaminants; but the buoyancy generated by the heating obstacle is helpful to drive the airflow up to the outlet, especially for the airflow near the front wall of the fume hood, however, the improvement to the airflow distribution is associated with heat load of the heating obstacle; when the heating obstacle is close to the opening or the rear wall of the fume hood, the airflow pattern is less effective to exhaust the contaminants.
Keywords:fume hood, heating obstacle, airflow distribution, eddy, buoyancy, contaminant, numerical simulation