突扩突跌体型侧墙负压区的演变特征  

Evolvement characteristics of zones of negative pressure along sidewall of discharge structure with a shape of sudden lateral enlargement and vertical drop

作　　者：聂孟喜[1] 段冰[1] 李琳琳[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室(筹),北京100084

出　　处：《水利水电科技进展》2006年第6期34-36,共3页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金资助项目(50479002)

摘　　要：针对突扩突跌体型泄水建筑物侧墙上呈现出的复杂水力特性,通过大比尺模型试验,测量了突扩突跌体型侧墙上的平面压力分布,绘制了侧墙等压线分布图,并对其分布特征及演变规律进行研究。结果表明,突扩突跌体型侧墙上存在呈椭圆形分布的负压区域,负压区的范围、负压值等随水头变化较大,但是负压区的中心位置具有相对稳定性,其相对稳定位置与侧空腔的长度有关。The pressure distribution along the sidewall of a discharge structure with a shape of sudden lateral enlargement and vertical drop was measured through large scale model tests. The isobar distribution along the sidewall was plotted, and the characteristics of pressure distribution and its evolvement pattern were studied in detail. The results show that the zones of negative pressure are elliptically distributed along the sidewall, and that their range and the value of negative pressure fluctuate greatly with water head, while the center of the zones of negative pressure always keeps steady, which is related to the length of lateral cavity.

关 键 词：泄水建筑物 突扩突跌体型 建筑物侧墙 压力分布 负压区 等压线 

分 类 号：TV135.2[水利工程—水力学及河流动力学]