Years of field observation has shown that, many cooling towers' fan flowrate can't reach the design value. This problem might be caused by the following two reasons: one is the design defects of the fan, and the other is the inaccurate calculation of the aerodynamic characteristics of the cooling tower. In order to know the aerodynamic characteristics of the cooling tower and its changing regulation, the aerodynamic characteristics of the airflow around air inlet of counterflow mechanical draft cooling tower were studied through physical model experiment, and the formula for its resistance calculation was given. It was demonstrated that, the calculation result of the resistance of the airflow around air inlet using the code formula tended to be inaccurate. The study results can provide reference for the design of cooling tower.%多年来的现场观测结果表明,很多冷却塔的风机风量达不到其设计风量值,一方面是由风机的设计所引起,另一方面则是由于冷却塔的空气动力特性计算不准确.为了解冷却塔的空气动力特性及变化规律,通过物理模型试验方法对逆流式机械通风冷却塔进风口区域的空气动力特性进行了研究,给出了其阻力计算公式.结果表明,目前机械通风冷却塔进风口区域的阻力计算结果偏不安全,研究结果可为冷却塔设计提供参考.
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