CAJ | 학술논문

掺气减蚀措施可以减免高速泄水建筑物的空蚀破坏.采用突扩突跌掺气设施,会同时形成底空腔及侧空腔,获得较好的掺气减蚀效果,对建筑物底板及侧墙均起到良好的保护作用,在有压出流条件下,通过对突扩突跌掺气设施水工模型进行不同突扩宽度、跌坎高度、下游坡度、来流条件下的模型试验,初步确定了跌坎高度、突扩宽度、下游坡度对空腔长度的作用方式.结果表明,有压出流条件下,在其他条件相同时,底空腔长度与突扩宽度、跌坎高度均呈正相关关系,与下游坡度呈反相关关系;侧空腔长度与突扩宽度呈正相关关系,与跌坎高度及下游坡度均成反相关关系.最后通过量纲分析拟合出有压出流条件下,相对侧空腔长度与综合水力参数 X的关系,得到在 X<8时计算侧空腔长度的经验公式.
참기감식조시가이감면고속설수건축물적공식파배.채용돌확돌질참기설시,회동시형성저공강급측공강,획득교호적참기감식효과,대건축물저판급측장균기도량호적보호작용,재유압출류조건하,통과대돌확돌질참기설시수공모형진행불동돌확관도、질감고도、하유파도、래류조건하적모형시험,초보학정료질감고도、돌확관도、하유파도대공강장도적작용방식.결과표명,유압출류조건하,재기타조건상동시,저공강장도여돌확관도、질감고도균정정상관관계,여하유파도정반상관관계;측공강장도여돌확관도정정상관관계,여질감고도급하유파도균성반상관관계.최후통과량강분석의합출유압출류조건하,상대측공강장도여종합수력삼수 X적관계,득도재 X<8시계산측공강장도적경험공식.
@@@@The measures of air entrainment and cavitation alleviation can relieve the cavitation damage of the high‐speed discharge structure .Use of the sudden lateral enlargement and bottom drop aerator device can form both bottom cavity and lateral cavity , which can protect the bottom plate and side wall and thus provide good results on air entrainment and cavitation alleviation .Dif‐ferent hydraulic model tests were performed on a sudden lateral enlargement and bottom drop aerator device with different sud‐den expansion widths ,drop sill heights ,downstream slopes ,and flow conditions .The impacts of sudden expansion width ,drop sill height ,and downstream slope on the cavity length were determined .The results showed that the bottom cavity length has a positive correlation with the sudden expansion width and drop sill height but a negative correlation with the downstream slope . The lateral cavity length has a positive correlation with the sudden expansion width but a negative correlation with the drop sill height and downstream slope .Finally ,the relationship between relative lateral cavity length and comprehensive hydraulic param‐eter X was fitted using dimensional analysis ,and an empirical equation to calculate the cavity length when X<8 was obtained .