The Application of Porous Media Model in the Lower Windbreak of 300MW Air-cooled Island

Based on the research of 300 MW direct air-cooled unit,we make numerical simulation of the external flow filed of the air-cooled island was made with CFD,and analyze the effects of lower windbreak in different situations on the direct air-cooled condensers.As the result shows,the fall of the air-cooled condenser efficiency is the result the downdraught and hot air recirculation.And the result also shows that the mean heat transfer efficiency increase 12.1% when the lower windbreak situated in the outer brim all around the air cooled platform,however,if the porous lower windbreak,with 1.73 times bigger in area than the direct lower windbreak,is situated with an angle of 90° in the outer brim of the air cooled platform,the average heater transfer efficiency increases 2.1%,which is more conducive to the heat transfer of he condenser,and also provides theory evidence for the structural improvement of the air-cooled island.