长泄洪洞模型糙率修正方法研究  

Revision of Roughness on the Wall of a Long Tennal in Physical Model

作　　者：贺昌林[1] 余挺[1] 张建民[1] 许唯临[1] 彭勇[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室

出　　处：《四川大学学报（工程科学版）》2007年第6期26-29,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家杰出青年科学基金资助项目(50325928);国家自然科学基金委员会;二滩水电开发有限责任公司;雅砻江水电开发联合研究基金资助项目(50539060);国家自然科学基金资助项目(50479062)

摘　　要：针对长泄洪洞在小比尺物理模型壁面糙率不相似问题进行理论分析和试验研究。通过合理的技术方案和手段在不改变泄洪洞位置与原河道相互关系的前提下,可以在小比尺物理模型上实现泄洪洞出口流速和流量的相似。研究表明,本方法适用于有压接无压和明流泄洪洞,很好的解决了在小比尺模型上长泄洪洞出口挑流水力特性及下游冲刷特性的模型相似性难题,实测结果与理论分析结果符合良好。Comparability of roughness is studied experimentally and theoretically in a long tunnel in physical model. These results show that comparability of roughness can be achieved by adoptting the rational technique on a base of keeping their positions of the tunnel and the riverway. The length of tunnel with the higher velocity is replaced with the length of tunnel with the lower velocity. The theoretical value of the velocity and the discharge are in agreemant with the revised value by measured in revised physical model. The method is suitable to revise roughness on the wall of the pressure tunnel and the open channel in order to obtain the practical experimental data.

关 键 词：长泄洪洞 糙率修正 模型相似率 试验研究 

分 类 号：TV131.61[水利工程—水力学及河流动力学]