泄洪竖井内水气两相流研究方法对比分析  

Comparative analysis of research methods for water gas two phase flow in flood discharge shaft

作　　者：南军虎[1] 陶然 高欢 马康宁 魏佳芳 杨霄 Jun-hu Nan;Ran Tao;Huan Gao;Kang-ning Ma;Jia-fang Wei;Xiao Yang(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Great Protection Branch,Three Gorges International Tendering Co.Ltd,Wuhan 430070,China)

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050 [2]三峡国际招标有限责任公司大保护分公司,武汉430070

出　　处：《水动力学研究与进展（A辑）》2022年第5期684-690,共7页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(51509123,52069011);甘肃省教育厅产业支撑计划(2021CYZC-27);兰州理工大学红柳优秀青年人才支持计划。

摘　　要：环形掺气坎是设置于泄洪洞竖井中的掺气减蚀技术,为明晰不同的水力学方法对其下部水气两相流特性研究的适宜性,该文以公伯峡水电站泄洪竖井为例,结合原型观测、模型试验和数值模拟三种水力学研究方法,研究了不同方法对泄洪竖井内水力特性的适宜性。结果表明:3种方法均能准确反映进口段水流流态;数值模拟在压强、掺气特性、通风特性和消能率等方面的模拟结果较为准确;模型试验因缩尺效应等原因不能完全反映竖井段的水气掺混效果,使其难以准确反映竖井内水气两相流流动规律。工程设计中应结合多种水力学研究方法共同研究,以确保结果的准确性。The annular aeration is a full section aeration technology suitable for the shaft of the spillway tunnel. To investigate the adaptability of the hydraulic research methods to water air two phase flow in flood discharge shaft, taking the flood discharge shaft in Gongboxia hydropower station as an example, the results obtained by applying prototype measurements,physical modeling experiments, and numerical simulation are compared and the adaptability of the methods for different parameters is determined. The results show that the three methods have relatively consistent descriptions of the flow patterns in the inlet section. The numerical simulation can overcome the limitation of prototype observation, and has a good effect on the simulation of macroscopic flow pattern of annular cavity and water-gas mixing area in the inner section of vertical shaft. The numerical simulation results of pressure, aeration, ventilation, energy dissipation and other characteristics can be of reference value for the preliminary design of similar projects. The model tests are weak in the simulation of the negative pressure of the cavity and the mixing effect of water and air in the shaft, and the cavity length of the models in the shaft is much smaller than that of the prototype observation and numerical simulation, which affects the accuracy of other parameters in the shaft and results in necessary corrections in the engineering design.

关 键 词：泄洪竖井 环形掺气坎 水气两相流 原型观测 模型试验 数值模拟 

分 类 号：TV13[水利工程—水力学及河流动力学]