摘要
利用针式掺气流速仪测量掺气浓度场、流速场,气泡尺寸及其概率分布的研究成果表明,原型水流韦伯数高,形成微小气泡的能力比模型强,气泡上浮慢,接近底部的小尺寸气泡概率及掺气浓度比模型大.0.2mm或0.5mm以下的微小气泡可能在掺气减蚀中起着主要作用.完善掺气检测仪器,加强掺气水流中气泡尺寸及其概率分布的观测,比较不同气泡尺寸的掺气减蚀作用,建立多级气泡尺寸的掺气水流数学模型,是今后掺气减蚀研究的新方向.
Using the air concentration probe of needle type,the air concentration field,velocity field,scale and probability distribution of air bubble s were measured.The results indicated that comparing prototype with model,theWeber number is high,capability of producing tiny air bubbles is powerful ,and near bottom the probability and air concentration of tiny air bubbles is bigg.Perhaps the air bubbles of smaller than0.2mm or0.5mm play the main role in reducing cavitation damage.The new directions of study on entrain air to reduce cavitation damage include improv-ing instrument of measuring air concentration,emphasizing the observation of scale and probability distribution of air bubbles,studying the relation of air bubbles scale with reducing cavitation damage,and setting up the mathematical model of entrain air flow with manifold air bubble scale.
出处
《水利水电技术》
CSCD
北大核心
2001年第10期13-16,共4页
Water Resources and Hydropower Engineering
关键词
高速水流
泄水建筑物
掺气减蚀
掺气浓度
掺气测量仪器
气泡尺寸
high velocity hydraulics
discharge structure
entrain air to reduce cavitation damage
air concentra-tion
air bubble scale
probability distribution of air bubbles.
