Numerical Investigation on the Flow Field Characteristics and Ventilation Effectiveness of Cross-shaped Column Attachment Ventilation Under Cooling Mode
Column attachment ventilation(CAV)is a new type of air distribution,and the structure characteristics of the column will directly affect its air distribution.In this paper,the square column and cross-shaped column were taken as the representatives of a regular structural column and a special-shaped structural column,respectively.And numerical simulation was made to study the indoor airflow distribution under cross-shaped column attachment ventilation(CS-CAV),and compare the findings with the traditional square column attachment ventilation(S-CAV).The results showed that it is feasible to use the CS-CAV in cooling mode.The near-wall velocity of the inner concave surface of the cross-shaped column(0.1 m away from the column surface)is 0.4 m/s higher than that of the outer convex surface of the cross-shaped column and square column surface,which helps to send more energy into the occupied zone in cooling mode.Since the inner concave surface of the cross-shaped column can strengthen the impact of the airflow near the column corner.In the occupied zone,the ADPI of the CS-CAV is slightly higher(about 10％)than that of S-CAV.However,under some working conditions,the ADPI of CS-CAV meets the standard(＞80％),while that of S-CAV does not.These indicate that CS-CAV has a higher overall comfort compared with S-CAV.
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