【作者】 韩浩冉； 田忠； 刘文； 杨欣伟；

【Author】 HAN Hao-ran;TIAN Zhong;LIU Wen;YANG Xin-wei;State Key Lab.of Hydraulics and Mountain River Eng.,Sichuan Univ.;

【机构】 四川大学水力学与山区河流开发保护国家重点实验室；

【摘要】 非常洞塞泄洪洞改建成常规泄洪洞很可能存在空化数降低,压强减小,出口流态恶化等问题,针对上述问题,本研究结合某大型非常泄洪洞工程,采用模型试验的方式,研究了在4种不同试验工况下,泄洪洞泄流量、洞壁压强分布、下游流场和冲坑情况,结果表明:在自由出流的情况下,试验各工况下洞壁压强均为正压,水流空化数没有明显降低,下游水位不会对洞内沿程的压力分布产生显著影响;随着压坡高度的降低,泄流量降低幅度不大,冲击区脉动压强均方根减小;下游水流逐渐向河道中心靠拢,冲坑逐渐远离左岸。更多还原

【Abstract】 Reconstructing the special spillway tunnel into common one would easily lead to the decreasing of cavitation and pressure and worse flow.For solving the above questions,the paper analyzes the discharge,wall pressure,flow field downstream and scour by model test under four different test condition combined with a spillway engineer.The result shows that:in all test condition,the wall pressure is positive,the cavitation number does not decrease clearly and the water level downstream would not affect the pressure in tunnel;besides,with the decrease of pressure slope height,the discharge and fluctuation pressure would reduce and the wall pressure would increase;the flow downstream would turn to the center of river so as the scour.更多还原