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轴流风机动叶安装角调整漂移是导致电站非计划停机的主要故障之一。以带扩压器的OB-84型轴流风机为对象,采用Fluent对单叶片安装角发生不同程度同向和反向偏离时的风机内流特征、性能曲线和噪声变化进行了三维数值模拟。研究表明:异常动叶安装角的偏离值及其偏离方向对风机的性能曲线和噪声特征有明显的影响,动叶异常时对应的全压和效率值大都低于正常情形,而噪声则增强,且越大,其变化幅度愈显著;异常叶片扰乱了流场内的总压和噪声分布,随增加,其影响区域由相邻流道扩展至下游处的多个流道,并形成狭长的低压带和高噪带。
Axial fan blade mounting angle adjustment Drift is one of the major failures that cause unscheduled machine shutdowns. Taking OB-84 axial flow fan with diffuser as an object, three-dimensional numerical simulation of fan inlet flow characteristics, performance curves and noise changes was carried out using Fluent with different degree of single-blade mounting angle in the same direction and in opposite direction. The results show that the deviation value and the deviation direction of the mounting angle of the abnormal moving blade have a significant effect on the performance curve and noise characteristics of the fan. The corresponding total pressure and efficiency values of the moving blade are mostly lower than normal while the noise is enhanced, And the larger the variation range is, the more obvious the variation range is. The abnormal blades disrupt the distribution of total pressure and noise in the flow field. With the increase, the affected area expands from the adjacent flow path to the multiple flow paths at the downstream and forms a long narrow pressure Belt and high noise.