煤棚体型系数在山墙不同封闭状态下的对比

Body shape coefficients of closed and semi-closed arched coal sheds

根据相似原理,对煤棚进行了在山墙不同封闭状态下的刚性模型风洞试验,获得不同风向角下的体型系数分布,并与规范中敞开煤棚的体型系数进行对比。研究表明,在7个风向、2种不同封闭状态下的体型系数分布复杂,很难采用规范中15个分区进行概括;山墙封闭、半封闭不同状态下煤棚的体型系数差别较大,其原因主要是不同封闭状态下的风场存在较大差异,总体而言半封闭状态下的体型系数高于封闭状态下的体型系数,各分区体型系数变化趋势相近。

A wind tunnel test of a dry coal shed under semi-closed and closed conditions is carried out to obtain the distribution of body shape coefficients under different wind directions.The testing results are then compared with the body shape coefficients of the open coal shed regulated in the specification.The results show that the distribution of shape coefficient under two conditions in seven wind directions is complex,and it is difficult to be generalized by using the 15 partitions used in the specification.Significant difference in the distribution of body shape coefficients between closed,semi-closed and open coal shed can be found,which is mainly induced by the large divergence in the wind fields of the closed,semi-closed wind field and open coal shed.For the wind-resistant design of closed and semi-closed dry coal sheds.