摘要
电厂制冷系统中的冷却塔主要选择机力通风湿式逆流冷却塔.现场情况是冷却塔轴流风扇下方有一条用于检修的混凝土十字结构横梁,流体绕经这类钝体后在其后方会形成一系列周期性的尾涡,增加风扇入流的不均匀度以及湍流度,加大风扇气动噪声影响.为此,研究工作首先通过改造、设计出与现实电厂冷却塔工作方式相同的实验模型;然后通过对十字梁结构的设计,研究不同十字梁结构对风扇气动噪声的影响,证明导流十字梁结构有助于降低风扇来流湍流度,使其气流更加均匀;最后通过对阻尼网的选择安装,利用其整流作用以有效降低冷却塔气动噪声.此项研究工作为电厂冷却塔降低气动噪声影响提供理论与实验支持.
The large mechanical draft counter flow wet cooling tower has been generally chosen for the refrigeration system of power plants. According to field situation, there is a concrete cross beam under the axial flow fan of a cooling tower. This bluff body will produce a series of periodic wakes after the passage of the fluid, which will increase inflow nonuniformity and turbulence of the fan and increase the aerodynamic noise of the fan. For the research work, firstly, the same experimental model with the actual power plant cooling tower was designed. Secondly, different kinds of cross beam were selected to study the irffluence of the aerodynamic noise of the fan. It was verified that the leading cross beam structure could reduce the turbulence intensity and made airflow more uniform. Finally, the damping nets were selected and installed. The aerodynamic noise of the cooling tower was effectively reduced by the rectifying action of the damping nets. The results provide theoretical and experimental support to reduce the influence of the aerodynamic noise.
出处
《中国计量大学学报》
2017年第3期287-292,共6页
Journal of China University of Metrology
关键词
冷却塔
横梁
阻尼网
cooling tower
cross beam
damping net
