多级孔板消能泄洪洞设计初探

Preliminary Study on Design of Multiple Orifice Tunnels for Energy Dissipassion

多级孔板消能泄洪洞是在小浪底水利枢纽工程设计过程中提出的一种全新的消能工，鉴于国内外大型工程中尚无实践经验，经批准在碧口水电厂排沙洞内进行孔板消能的原型试验，任务主要是了解孔板的消能特性、水流空化及脉动情况、振动情况、孔板孔缘的保护措施和施工经验。试验取得了圆满成功，为多级孔板消能泄洪洞的设计积累了丰富的经验，也为小浪底工程将导流洞改建为永久孔板泄洪洞打下了坚实的基础。

Multiple Orifice Tunnel is a newly developed energy dissipation method design of Xiaolangdi Multipurpose Dam Project.Prototype test for orifice energy dissipation was performed inside the sediment tunnel of Biko Hydropower Plant.The main purposes of the test are to find energy dissipating characteristics of orifices,flow cavitation, fluctuation and vibration,protection measures for edge of orifice ring and construction experience. Wealth of experience for design of multiple orifice tunnels has been acquired and a solid foundation for changing diversion tunnels of Xiaolangdi Project into permanent orifice tunnels laid.