head vortex 中文意思是什麼
head vortex
解釋
首渦流-
Using a vortex - flow drop shaft to convey water from a high level to a diversion runnel under the condition of high water - head and large discharge is a new kind of technology in the scheme of reusing a diversion tunnel as a discharge tunnel
近年來，為解決高水頭、大流量導流洞改建泄洪洞的技術難題，旋流式豎井泄洪洞逐漸成為研究熱點之一。但迄今為止，該技術尚未得到推廣應用，其主要原因在於人們對豎井螺旋水流運動特徵缺乏足夠的了解和深入的研究。 -
In this thesis hydraulic experimental studies and theoretical analyses on the vortex - flow drop shaft were conduced and the following results were accomplished : ( 1 ) in the model test some hydraulic characteristics including the shape of air core in the center of the drop shaft, the radial distribution of water flow velocity and the distribution of pressure on the wall of the drop shaft were measured under the condition of high water head above 250m and large discharge above 1400m3 / s. ( 2 ) a kind of computational method for the spiral water flow in the air core region of drop shaft was discussed and applied and the results agree the experimental data well. ( 3 ) the total ratio of energy dissipation in the drop shaft can reach 90 % and the energy dissipation in every region was discussed quantitatively
本文通過試驗研究與理論分析對旋流式豎井泄洪洞應用於高水頭、大泄流量情況時存在的一些水力學問題進行了研究和探討，取得以下主要成果：一、結合小灣工程導流洞改建，對高水頭（ 252m ） 、大泄流量（ 1400m ~ 3 s ）條件下旋流式豎井中的水流運動特徵進行了比較全面的測量，包括空腔形態、徑向流速分佈及井壁壓強等；二、提出了豎井空腔段螺旋水流水力計算方法，其計算結果與實測值吻合良好；三、利用試驗與計算結果，對旋流式豎井的消能機理進行了探討，對豎井各部分的消能能力有了總體認識；四、對豎井下部消力井的合理井深進行了優化試驗研究，發現消力井合理深度為0 . 9d左右；五、通過試驗研究，歸納出豎井水流總摻氣量估算方法，為導流洞排氣方案的設計提供了參考依據；六、在高水頭、大流量條件下，豎井空腔段下部流速很高，盡管水流螺旋運動引起的離心力可以確保井壁壓強保持正壓，但空化數依然較低，因此豎井的空化空蝕始終是工程界關注的重大問題。 -
Research on anti - cavitation characters of a small - flow high - head vortex pump
一種小流量旋渦泵的汽蝕性能試驗研究 -
Cw the feature of cw magnetic - driving vortex pumps is little capacity, high - head, it can convey the fluid containing 20 percent of gas and non - lubricative, also can be used to the occasion where npsh is low
Cw型磁傳動旋渦泵，是小流量高揚程應用最理想的選擇;可輸送含有20 %氣體的介質，可應用於非潤滑性流體和汽蝕余量很低的場合。 -
The head of hair - pin vortex rise to the center of the pipe and horse - shoe vortex is formed. then the horse - shoe vortex detaches from hair - pin vortex and form isolated ring - like vortex
首先發卡渦的頭部在向圓管中心抬升的過程中，會形成馬蹄渦，馬蹄渦從發卡渦頭部脫離后，形成孤立的環形渦。 -
The detachment of ring - like vortex from hair - pin vortex induces the breakdown of the head of hair - pin vortex. then the broken small vortex structures move towards the wall
環形渦的形成會引發發卡渦頭部的破碎，破碎的小渦結構向壁面運動。 -
When the psb amplitude is weak, a series of hair - pin vortex will be formed. the formation, diffusion, breakup of the front edge of hair - pin vortex and the break of the head of hair - pin vortex lead to the first instability and form the slug structure
在一定幅值的psb弱擾動作用下，圓管流動中出現一系列發卡渦，發卡渦前緣處環形渦的形成、擴散和破裂以及發卡渦頭部的破碎導致了流動的第一次失穩，產生塞流結構。
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