转叶孔板螺旋流消能的影响因素试验分析

Test Analysis of Influencing Factors of Spiral Flow Energy Dissipation for Orifice Plate of Rotary Vane

为解决供水工程中的过剩水头问题,常在有压输水管道中配置合适的消能装置,转叶孔板螺旋流消能是一种新型的内消能方式,通过转叶孔板螺旋流消能装置的水力特性试验,可知影响转叶孔板螺旋流消能效率的主要影响因素有雷诺数Re、转叶孔板开口角度和孔板之间的相互扭转角度,还有试验装置结构的设置。根据试验数据计算分析各个影响因素对消能效率的影响。结果表明,转叶孔板螺旋流消能效率与转叶孔板之间的扭转角成正比,与雷诺数成正比,与转叶板的开口角度成反比。试验装置在进口段和出口段设置管径突变均对消能有利,该装置比与其消能原理类似的孔板消能装置更实用,且消能效率更高,对下游建筑物设施起到良好的保护作用,可推广应用。

To solve the excess water head in supply project, the suitable energy dissipation device is usually con- figured in the pressurized water conveyance pipeline. The spiral flow energy dissipation of orifice plate of rotary vane is a new way of energy dissipation. Hydraulic characteristic test demonstrates that the main factors are the Reynolds number Re, the opening angle of orifice plate of rotary vane and the mutual torsion angle between orifice plates and test device structure, which affect the orifice plate of spiral flow energy dissipation efficiency. Based on the test data, the influence of various factors on the energy dissipation efficiency is analyzed. The results show that the spiral flow energy dissipation ef- ficiency of orifice plate of rotary vane is proportional to the Re and the mutual torsion angle between orifice plates while it is inverse proportion to the opening angle of orifice plate. Setting sudden change of diameter in inlet section and outlet sec- tion are favorable for energy dissipation. Compared with other similar energy dissipation device, the orifice energy dissi- pation device is more practical with high energy dissipation efficiency, and it has good protective effect for the downstream building facilities. So, it can be widely used in hydraulic engineering.