进风口辅助通风是提高湿式冷却塔热力性能的一种有效方法。为探究变运行工况对于辅助通风湿式冷却塔热力性能的影响，建立了淋水面积为7500m2的辅助通风湿式冷却塔热力性能三维数值计算模型，分析了辅助通风对塔内空气流场及温度场的作用规律，计算了不同循环水流量、淋水密度和环境湿球温度下的冷却塔通风量及循环水温降，并与常规冷却塔进行了对比。研究表明：进风口辅助通风主要提高了风机迎面区域和冷却塔中心区域的通风量，且其对中心区域气水换热的强化作用最明显；辅助通风对整塔通风量的提升量基本在1160~1200kg/s之间，随运行工况的变化程度较小；随着循环水量的增加，辅助通风对循环水温降的增效作用越来越明显，使其最大升高了0.4℃，而进塔水温和环境湿球温度基本不影响辅助通风对循环水温降的增效程度。

Auxiliary ventilation at the air inlet is an effective way to strengthen the heat dissipation capacity of wet cooling towers. In order to study the influence of operating condition on the thermal performance of auxiliary ventilation cooling towers, a three-dimensional numerical model for the thermal performance of a cooling tower with a water drenching area of 7500m2 was established, and the effect of auxiliary ventilation on the air flow field and temperature field was analyzed. The air mass flow rate and circulating water temperature drop of cooling tower under different circulating water flow rate, water drenching density and ambient wet bulb temperature were calculated. The results show that the auxiliary ventilation mainly increases the ventilation rate at the facing area of the fans and the central area of the cooling tower, and the water temperature drop at the central area is the most obvious. The increase of auxiliary ventilation on the air mass flow rate is basically between 1160~1200kg/s, which is less affected by the operating conditions. With the increase in the circulating water flow rate, the effect of auxiliary ventilation on water temperature drop became more and more obvious, with a maximum increase value of 0.4℃. In addition, the water temperature and ambient wet bulb temperature have no prominent effect on the efficiency of the auxiliary ventilation on water temperature drop.

TK264

山东省自然科学基金