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water cushion 【機械工程】水墊。

water cycle

According to the selected project , a stability test with scale of 1 : 35 of cushion bottom had been done . with the research results of the experiments and the flow shape of xiao wan hydraulic power station were thought about , on the other hand , the ternary complex jet shape of baishan water cushion was analyzed , all this gave a base for the analysis of the force of the cushion bottom . through observation , the dynamic water pressure , the fluctuation pressure , the time - homogeneous pressure on the surface of the bottom and the characteristics of the fluctuation pressure could be got , also the calculation method and the test results were compared to get the argument 針對選定的方案,進一步做了1 : 35比尺的水墊塘底板穩定性試驗;通過試驗及借鑒小灣水墊塘內水流流態的研究成果,分析白山水墊塘內三元復雜淹沒射流流態,為水墊塘內底板受力分析打下基礎;通過觀測得到水墊塘底板動水沖擊壓力、脈動壓力、底板上下表面的時均壓力及脈動壓力特性,并通過計算方法與試驗成果進行相互比較論證。

To design the water cushion of baishan arc dam , the design experiment of ertan hydraulic power station , xiao wan hydraulic power station were refereed . through large amount of scientific experiments and theoretical calculation , and the design coefficients of water cushion in domestic and abroad were summarized , then the design layout of the baishan cushion was worked out at last 本文針對白山拱壩水墊塘方案設計,參考國內二灘、小灣等工程設計經驗,通過大量的科學試驗和理論計算,總結國內外的水墊塘設計參數,最后確定了白山水墊塘的設計方案。

The main contents are as follows : in order to finish this work well , the author collected the basic parameters of water cushion in china and foreign countries , and analyzed the questions and shortcoming in the designing of cushion in domestic and abroad , and summarized the design experiment of xiao wan hydraulic power station and ertan hydraulic power station in china , finally the main controlling design parameters of baishan water cushion , that is the allow dynamic impact water pressure and unit water consumed energy rate were asserted 具體內容如下:為了做好白山水墊塘設計,本文通過收集國內外水墊塘設計的基本參數,分析水墊塘設計存在的問題及不足,總結國內小灣、二灘工程的經驗,確定白山水墊塘設計主要控制參數即允許動水沖擊壓力及水墊塘單位水體消能率。

Air is entrained as water jetting into water cushion pool , the gas - liquid two phase flows field are formed . the every phase velocity field are measured by using piv and ptv ( particle tracking velocimetry ) method in the course of jet angle 75and60 in gas - liquid flows of water cushion pool . image house of two phase flows are set up 西安理工大學碩士學位論文使用數字圖像處理技術中的piv和ptv測速技術就射流入水角75度和60度兩種情況分別測量了水墊塘模型水氣兩相流流場的各相速度場,建立了相應的兩相流流態圖像庫。

For two up and down jets plunging into a cushion pool , two factors of up depth and down depth of water cushion are first introduced actually , then the methods calculating the reasonable depth of cushion pool and the reasonable distance between up jet and down jet are introduced 針對上、下雙股水舌入射水墊塘時水墊塘底板上的壓力變化規律,首次根據射流理論提出了上、下水墊深度的概念及其計算方法,并進而提出了計算水墊塘合理深度及水墊塘內水舌合理入水間距的方法。

Abstract : through study on energy dissipation of goupitang project on the wu - jiang river , the velocity field in the water cushion pool downstream ski - jump or drop was measured by hot - film anemometers on a fine model with scale 1 380 文摘:結合烏江構皮灘水利樞紐工程消能問題研究,用熱膜流速儀在比尺為1 380的精細模型上量測了拱壩挑跌流在水墊塘內的流速場,并由試驗成果分析了淹沒射流在水墊塘內的消能過程,計算了消能率。

Cfx software is used to simulate flow fields of water cushion pool . contour stream line , vortex and kinetic energy in water cushion pool are found and offered as visualization form . the results of numerical simulation and piv are analyzed and compared in this paper 使用數值軟件( cfx )對此水工實驗模型的淹沒射流流場進行了數值模擬,得到水墊塘內的速度場、等流函數線圖,將這些計算結果以可視化結果的形式給出。

By the scale of 1 : 35 flood - relief model test , combined the structures built and the pump entrance will be built of baishan dam , to decide the overall arrangement of the water cushion 通過1 : 35比尺的整體泄洪模型試驗,結合白山已建的建筑物及籌建的白山大泵進水口,選定水墊塘的總體布置方案。

The optimization of laying out these structures , paths of flow jets and a water cushion pool for a high arch dam is first discussed systematically in this paper 本文首次系統地對高拱壩壩身泄洪孔口、泄流過程以及壩下水墊塘的布置優化問題進行了討論。主要內容和成果有1

Experimental research on uplift force acted on a piece of floor of arch invert water cushion pool and estimation to limit thrust load at skewbacks 反拱水墊塘底板塊上舉力變化規律的試驗研究

Study on flow characteristics in water cushion pool and mechanism of energy dissipation 水墊塘的水流特征和消能規律研究