In chapter 7, the DPIV (Digital Particle Image Velocimetry) systems is set up, the physical models such as sudden expansion channel, flow-out poppet valve and spool valve is fabricated.

第七章建立流場DPIV實驗可視化系統(tǒng)亚洲v久久v日韩国产区，制做突然擴(kuò)大流道模型曰韩无码中文字幕毛片，外流式錐閥模型和滑閥模型97超碰资源人妻，并利用粒子圖像測速技術(shù)對模型的速度場進(jìn)行測量亚洲永久精品一区二区在线观看。

Combining experimental solution and CFD analyses,a method to appraise noise of poppet valve was studied.

結(jié)合試驗結(jié)果和計算流體動力學(xué)的解析結(jié)果亚洲色无码一级毛片一区二区野外，研究液壓錐閥的噪聲評價方法。

This is the air-actuated poppet valve that will serve as the ballast tank blow vent.

這是空氣驅(qū)動錐閥將充當(dāng)壓載水艙的打擊黄色带国产网站，發(fā)泄草棚无码视频。

The hydraulic poppet valve is one of the most important component in the hydraulic transmission and control, whose characteristics of the inner flow field directly influents the valve s performance, especially the moving valve cone.

液壓錐閥是流體傳動與控制技術(shù)中重要的基礎(chǔ)元件，錐閥內(nèi)的流場特性直接影響閥的性能，特別是錐閥閥芯在運動過程中的流動特性對閥的工作性能有很大的影響对白荡伦系列完整版。

The theoretical foundation for further research is established. In chapter 6, the flow field of poppet valve and spool valve which are two kinds valve frequently used in hydraulic technique are predicated by finite element method. The flow field structure at different valve opening are illustrated by visualizing images. The effect on the flow noise and energy loss probably caused by vortexes is analyzed quantitatively, the flow channel of the valve is improved.

第六章用有限元方法對液壓傳動與控制中最常見的兩種結(jié)構(gòu)形式的液壓閥—液壓滑閥和液壓錐閥流場進(jìn)行數(shù)值預(yù)報男女视频在线一区免费观看，給出不同開口度和不同結(jié)構(gòu)尺寸下流場結(jié)構(gòu)的可視化圖像，定性分析渦旋的產(chǎn)生對流體噪聲及能量損失可能產(chǎn)生的影響黄页网站观看在线观看，并對閥的流道結(jié)構(gòu)進(jìn)行改進(jìn)婷婷视频一级。

To improve the response speed of on-off solenoid valve of big flux,detailed analysis on poppet valve is given and an on-off solenoid valve with movement of both spool and cover is designed.

通過對錐閥特性的分析，設(shè)計了一種閥芯国产欧美va欧美va在观看拍拍、閥套同時運動的芯套雙動高速開關(guān)閥黄片免费精，該閥增大了高速開關(guān)閥的開口度，提高了響應(yīng)速度和流量A片XX色xX色。

Cavitations is the major problems of designing water hydraulic valve, understanding the relationship between shape of valve and cavitations , avoiding cavitations is extremely important, this paper, the numerical simulation and visualization research of flow field is carried out to research relation between the flow field of poppet valve and the length of valve seat by finite volume numerical method.

氣穴是研制水壓閥存在的主要難題欧美BBW操操操，認(rèn)識閥口形狀與氣穴的關(guān)系，避免產(chǎn)生氣穴現(xiàn)象是極其重要亚洲日本天堂欧美精品，本文應(yīng)用有限體積數(shù)值計算方法針對閥座倒角長度變化對水壓閥閥道內(nèi)流場的影響進(jìn)行數(shù)值模擬和可視化研究国产一区黄视频，得到了一些有益的結(jié)論：倒角長度的改變對閥口間隙以及閥芯錐面與柱面相接的地方的負(fù)壓會產(chǎn)生比較大的影響

Furthermore, The effects of inlet velocity, outlet pressure, opening size as well as cone angle on cavitation intensity in the poppet valve, ball valve and water hydraulic poppet valve were numerically investigated.

進(jìn)一步分析了錐閥，球閥和純水液壓錐閥閥口幾何參數(shù)與邊界條件對氣穴的影響亚洲色欲色欱WWW在线。

In order to optimize the spring of the reciprocating pump valve and establish the best spring factor matching, the unsteady opening-closing process of the poppet valve was simulated. The simulation based on computational fluid dynamics approach, and the dynamic-grid technology and User Defined Function was conducted to depict the law of motion of the poppet valve.

采用RNG k-ε湍流模型色色网站全裸大全视频、動網(wǎng)格技術(shù)以及用戶自定義程序一级女性黄色生活片，對往復(fù)泵泵閥的啟閉過程進(jìn)行了非定常數(shù)值仿真欧美人牲交全过程，得出了不同彈簧因素下、閥門從開啟到關(guān)閉的過程中碰碰碰摸摸摸免费视频，閥芯的升程隨時間的變化規(guī)律性色网国产、閥的遲滯關(guān)閉時間以及閥芯落座的瞬時速度。

The flow characteristics in a genuine poppet valve was simulated in three dimensions and calculated at its different opening positions,poppet angles and flow volumes by using a CFD software of Fluent.

運用CFD通用軟件F luentaV黄色一级A片，以實際液壓錐閥為模型国产AV妓女影院妓女影视，對閥芯在不同開口度、不同半錐角以及不同流量下的流動特性進(jìn)行了三維仿真計算黄网页站立于免费，并對可視化圖形進(jìn)行了分析在线欧美视频免费观看国产。