CAJ | 학술논문

螺旋式鱼道是在现有竖缝式鱼道顺河布置的基础上进行结构改进而得到的一种新型鱼道，它将占用较小的平面面积，获得更大的提升高度。建立了数值模拟模型，采用结构化网格和隐式算法，以RNG k－ε湍流模型封闭方程，采用VOF法追踪自由水面，模拟了鱼道的流场。结果表明：鱼道中纵剖面水面稳定，水深沿程不变；不同水深截面水流流态及流速分布相似，均存在一个主流区和两个回流区；流速的最大值位于窄缝处，其值不超过1．2 m／s，出窄缝后流速迅速衰减到1．0 m／s以下，回流区流速较小，便于鱼类休息。
라선식어도시재현유수봉식어도순하포치적기출상진행결구개진이득도적일충신형어도，타장점용교소적평면면적，획득경대적제승고도。건립료수치모의모형，채용결구화망격화은식산법，이RNG k－ε단류모형봉폐방정，채용VOF법추종자유수면，모의료어도적류장。결과표명：어도중종부면수면은정，수심연정불변；불동수심절면수류류태급류속분포상사，균존재일개주류구화량개회류구；류속적최대치위우착봉처，기치불초과1．2 m／s，출착봉후류속신속쇠감도1．0 m／s이하，회류구류속교소，편우어류휴식。
Spiral fishway is a new-style fishway based on the structural improvements of the existing vertical slot fishway along the river,so it will occupy a smaller area on the plane and get more lift height. In order to investigate to the flow field in the fishway,three-dimensional numerical model was used to simulate the flow in the fishway through establishing numerical simulation region,using structured grids and implicit method and in addition,the renormalization group (RNG)k-εturbulent model being used to close Reynolds equations and volume of fluid (VOF)method was used to track the free water surface. The results show that there is a stable water surface and unchanged water depth in the fishway,a similar flow pattern and velocity distribution,and there always exists a mainstream region and two recirculation regions in each fish chamber. The maximum ve-locity of flow in the fishway is located at the area of the narrow slit,but not more than 1. 2 m/s,and the flow velocity reduces quickly to less than 1. 0 m/s out of the narrow slit,further more there are some recirculation regions for fishes rest where the velocity is very small.