水利水电科技进展
水利水電科技進展
수이수전과기진전
ADVANCES IN SCIENCE AND TECHNOLOGY OF WATER RESOURCES
2014年
5期
12-16
,共5页
马关博%徐一民%乔梁%荣岩
馬關博%徐一民%喬樑%榮巖
마관박%서일민%교량%영암
泄槽%掺气坎%反弧段%高速水流%空蚀%掺气浓度%高坝
洩槽%摻氣坎%反弧段%高速水流%空蝕%摻氣濃度%高壩
설조%참기감%반호단%고속수류%공식%참기농도%고패
chute%aerator%ogee section%high-speed flow%cavitation erosion%air concentration%high dam
针对泄槽底部掺气坎后的掺气浓度分布规律较为复杂、研究成果较少的问题,为了更清楚地探究泄槽底部掺气坎后上游直段、反弧段及下游直段水流掺气浓度分布规律,采用含有反弧段的泄槽进行模型试验研究。试验结果表明:上游直段、反弧段及下游直段水流中不同水深处掺气浓度的沿程变化规律是不相同的;其他条件不变时,水流掺气浓度随掺气坎高度的增加而增大,随反弧段反弧半径的减小而减小;掺气坎高度和反弧半径对掺气设施的有效保护范围有一定的影响,适当提高掺气坎的高度和反弧段的半径对增大掺气设施的有效保护长度有利。
針對洩槽底部摻氣坎後的摻氣濃度分佈規律較為複雜、研究成果較少的問題,為瞭更清楚地探究洩槽底部摻氣坎後上遊直段、反弧段及下遊直段水流摻氣濃度分佈規律,採用含有反弧段的洩槽進行模型試驗研究。試驗結果錶明:上遊直段、反弧段及下遊直段水流中不同水深處摻氣濃度的沿程變化規律是不相同的;其他條件不變時,水流摻氣濃度隨摻氣坎高度的增加而增大,隨反弧段反弧半徑的減小而減小;摻氣坎高度和反弧半徑對摻氣設施的有效保護範圍有一定的影響,適噹提高摻氣坎的高度和反弧段的半徑對增大摻氣設施的有效保護長度有利。
침대설조저부참기감후적참기농도분포규률교위복잡、연구성과교소적문제,위료경청초지탐구설조저부참기감후상유직단、반호단급하유직단수류참기농도분포규률,채용함유반호단적설조진행모형시험연구。시험결과표명:상유직단、반호단급하유직단수류중불동수심처참기농도적연정변화규률시불상동적;기타조건불변시,수류참기농도수참기감고도적증가이증대,수반호단반호반경적감소이감소;참기감고도화반호반경대참기설시적유효보호범위유일정적영향,괄당제고참기감적고도화반호단적반경대증대참기설시적유효보호장도유리。
Setting an aerator on the chute contained ogee section is an important subject of cavitation erosion. The distribution of air concentration in flow after bottom aerator still a challenge task and relevant research results are quite limited. In order to explore the distribution of air concentration on straight section after aerator, ogee section, and straight section after ogee section on chute, we use the chute with ogee section to set up an experiment. By doing it so, different size of aerator with different radius of ogee section have been tested, measured rand analyzed. The overall experiment results show that when other conditions remain unchanged, the air concentration in the flow increases with the increase of aerator's height and decreases with the decrease of the anti-arc radius of the chute. According to the air concentration in the flow, the length of protective segment of the chute may vary with aerator's height and the radius of anti-arc of the chute. To some extent, increasing aerator's height and the anti-arc radius of the flow chute can prolong the length of protective segment.