helical flow 中文意思是什麼
helical flow
解釋
螺線流-
The following results are obtained : ( 1 ) the flow in rotating helical pipes are affected by dean number, curvature, torsion ( or germano number ), the ratio of the coriolis force to the centrifugal force f number ( or rossby number ) and the geometry of the cross section
研究結果表明： （ 1 ）旋轉螺旋管道流動特性受dean數、曲率、撓率（或germano數） 、科氏力與離心力之比f數（或rossby數）以及截面的形狀五種因素的影響。 -
The following is the detail design of the pump, and a optimum mathematical model are presented to mostly reduce the helical gear pump flow pulse
在此基礎上進行了斜齒齒輪泵的結構設計，通過建立斜齒齒輪泵齒輪的優化數學模型，優化計算出使輸出流量脈動最小的斜齒輪參數，製造出斜齒齒輪泵樣機。 -
And at last the measurement of helical gear pump flow pulse has been presented, which include how to measure the flow pulse and the validating the theory mentioned before and to try to the solve the problems happened during the process
根據齒輪泵流量脈動的檢測要求，採用新的測試方法和手段，建立了中高壓齒輪泵性能測試裝置，並對樣機進行了性能測試。 -
At first, on the base of the analysis of the mechanism of the helical gear pump, the paper try to find the relationship of the helical gear pump flow pulse with its corresponding parameters, give the solution of the problems brought by the replace of spur gear to lay the firm basis for the structural design of helical gear pump
本論文在對齒輪泵工作原理和流量脈動機理分析的基礎上，首先探討了斜齒齒輪泵的輸出流量脈動與斜齒輪各結構參數之間的關系，以及由於斜齒輪替代直齒輪帶來的相關問題並提出解決辦法，為斜齒齒輪泵的結構設計奠定基礎。 -
Employing perturbation method and numerical simulation, we study the flow in rotating helical pipes including different rotations, different cross sections ( circular, elliptical, annular and square cross section ), and different geometrical structures
採用攝動方法和數值計算方法，研究了處于多種旋轉狀態下、多種截面形狀（圓截面、橢圓截面、環形截面、矩形截面） 、不同幾何結構旋轉螺旋管道流動。 -
When f is about fr, for curved pipes, the secondary flow appears eight vortexes for annular cross section and four for circular and four or six for elliptical ; for helical pipe, the secondary flow appears as a loop flow for annular and circular cross section, and a saddle flow for elliptical cross section
當f在fr左右時，對于彎管，環形截面上存在八個渦，圓截面上存在四個渦，橢圓截面上存在四個或六個渦；對于螺旋管，圓截面和環形截面上二次流表現為環流，橢圓截面上表現為鞍流。 -
But for real microfiltration, the distribution of shear stress on the membrane of the module with outside helical flow would have benefit to make smaller number of particles deposit on the membrane. ( 2 ) by means of orthogonal test and regression method, four new models, trans - membrane pressure model, flux model, trans - module pressure drop model, and efficiency model, were established, which roundly describe the performance of outside helical mf by depicting the flux, energy loss, and handling capacity simultaneously
（ 2 ）採用正交回歸實驗，在無顆粒沉積的理想情況下，建立基於層流數值解的膜器跨膜壓力損失模型、過濾通量模型、過膜器的壓力損失模型和膜器過濾效率模型，首次從通量、能量損失及膜器對料液的處理能力等三個方面，更全面地對外旋流方式下的微濾過程進行了描述。 -
In this dissertation, researches on the flow in curved pipes of the last century are firstly reviewed and then a flow model in a rotating helical pipe with multi - parameters is introduced
本文首先綜述了一個世紀以來有關曲線管道流動的研究成果，並在前人文獻的基礎上，提出一種多參數旋轉螺旋管道流動模型。 -
Numerical simulation on power - law fluid flow in helical pipes with circular cross - section
螺旋管道內冪律流體流動數值模擬 -
Air filtration portfolio, air filters, valve, oil mist machine, filter valve, oil mist separator, micro - mist separator, stability activated solenoid valve, pressure gauge, micro - valve and vacuum valves, links the release of the closure - pressure valves, and pipe connection, a one - way valve, t - shelves, shelves, brackets, diaphragm - type flow switches, blades type flow switches, further growth actuator, the valve lock, precision valve, pressure switches, mechanical pressure switches, pneumatic control ratio positioning devices, and electric - gas ratio positioning devices, and telecommunications - pressure converters, electro - pneumatic proportional valve, filter valve, shuttle valve, gas - electric relay and gas indicator, delay pneumatic valve and cylinder fcl, plumbing fcl, mufflers and exhaust cleaner, the excess flow valve with silencer, a one - way valve, rapid valve, rapid joints, rapid valve with fcl, rapid joint sub - cluster gas, micro joints, gas pipes, pipe from the devices, and helical coils, pipes, channels, scissors, multiple fastener, high - speed rotary joint, 10000 threaded joints, and insert the tube joints, rotary joints began, 68. 25 rapid joints and hoses, hose fittings and rapid non - electrostatic
空氣過濾組合空氣過濾器減壓閥油霧器過濾減壓閥油霧分離器微霧分離器穩定啟動電磁閥壓力表微型減壓閥減壓氣閥三通釋放式截流閥壓力開關管接頭單向閥t型隔板隔板托架膜片型流量開關漿葉型流量開關增速繼動器鎖定閥精密減壓閥壓力開關機械式壓力開關氣控比例定位器電-氣比例定位器電訊號-氣壓轉換器電-氣比例閥過濾減壓閥梭動閥氣-電繼電器氣源指示器氣動延時閥氣缸限流器管道限流器消聲器排氣潔凈器限流閥帶消聲器單向止回閥快速排氣閥快速接頭快速排氣閥帶限流器快速接頭集束分氣微型接頭氣喉管喉管脫離器螺旋管排管管道剪刀多管扣件高速旋轉接頭萬用螺紋接頭插入式管接頭旋式緊鎖接頭難燃性快速接頭和軟管不帶靜電快速接頭和軟管 -
3 、 the single - phase laminar flow and heat transfer has been calculated by different discredited scheme in helical tube and the results are very in accord with the obtained experimental data
3 、採用不同的差分數值離散格式，對螺旋管內單相層流流動換熱進行了數值計算，深入了解螺旋管內單相流動及強化換熱機理，其計算結果和已有的實驗數據非常吻合。 -
( 3 ) when f is about fr, the secondary flow reaches its weakest intensity, but has a most complicated structure. for co - rotation and counter - rotation in which the centrifugal force dominates the flow, the secondary flow in a rotating helical pipe has the same direction with that in a stationary one. for counter - rotation in which the coriolis force dominates the flow, the secondary flow has the opposite directions to that in a stationary one
（ 3 ） f在fr左右（離心力和科氏力相當的負旋轉） ，二次流強度最弱，但結構最復雜；對于正旋轉和離心力占優的負旋轉，二次流速度的方向和靜止的情況相同；對于科氏力占優的負旋轉，二次流速度的方向和靜止的情況相反。 -
Characters of the flow field of molten metal in mhd caster are s imulated and analyzed by means of numerical simulation. relationship between flow field of molten metal and the number of magnet poles, arrangement of magnet pole s, rotating velocity of magnetic field as well as helical arrangement of permanen t magnets is revealed. it can be used as reference for optimizing design of perma nent caster
利用數值模擬對不同磁場條件下的永磁鑄機金屬液流場特徵進行了模擬分析；揭示了金屬液流場與永磁體極數、磁極排布方式、磁場旋轉速率以及永磁體螺旋式排布之間的關系，為永磁鑄機的優化設計提供了參考依據。 -
The main works and conclusions in this paper are as follows : 1 、 the two - phase flow patterns are observed in micro - fin helical tube. the flow pattern map is obtained and compared with the map of smooth straight tube, the result of which explains the theory of transformation among the flow patterns in micro - fin helical tube and the pattern difference between helical and straight tube
具體說來有以下內容： 1 、對微肋螺旋管內兩相流動流型進行了實驗觀察，作出了流型圖，並與水平直管流型進行了分析、比較，解釋了兩者間的流型差異和微肋螺旋管流型間的轉變機理。 -
In sum, in the case of laminar flow, the outside helical flow would have a little influence on mf of purity water
總之，在層流條件下，對于純凈水的微濾，外旋流的方式對微濾通量的影響並不顯著。 -
The key problems for mf are concentration polarization and membrane fouling. mf assembly with outside helical flow is a new kind of equipment which can enhance permeate flux by means of the operating principle of a hydrocyclone. and up to now many researches of it has been mainly done experimentally
外旋流式膜器巧妙地將水力旋流器的原理與管式膜器微濾相結合，是一種新的強化微濾的膜器結構，目前對其膜器環隙內的流場分佈及分離性能研究均處于起步階段，且都以實驗研究為主。 -
( 3 ) under the ideal conditions of no particle deposition, the complex effects of flow parameters and geometry on performance of microfiltration with outside helical flow were discussed. and it is suggested that when designing, several factors should be taken into account comprehensively. it is noted that increasing mf capability will, at the same time, increase the energy loss of the module
（ 3 ）綜合分析了在無顆粒沉積的理想情況下，流動參數、結構參數對微濾效果的影響情況，發現各參數對微濾效果的影響復雜，在膜器優化設計時必須綜合考慮各因素而適當選取，且微濾效果的提高是以過膜器壓力損失的增大為代價的，從而從理論上對實際微濾過程中觀察到的通量隨操作壓力的增大而增大的現象做出了解釋。 -
( 4 ) the conditions of no particle deposition or making deposited particles move along the membrane surface were determined with the help of the analysis of forces acting on particles, from which, it may be considered that in the helical flow these conditions would be easier to reach than in the axial flow. when these conditions be satisfied in the whole region, there would be no or only a dynamic cake on the membrane surface. in addition, to ensure a long time steady microfiltration, sometimes over - high flux should be avoided
（ 4 ）通過顆粒受力分析，推導出外旋流方式下顆粒不沉積膜面的條件和已沉積顆粒沿膜面滾動的條件，認為從減小顆粒的沉積到促使已沉積顆粒沿膜面的滾動等方面，外旋流方式相對外軸向流較容易實現，當膜面上所有點上都滿足上述條件時，在膜面上將無濾餅或形成一阻力較小的動態濾餅層。 -
The main contributions of this work are included as follows : ( 1 ) numerical tests of the outside axial and helical flows were carried out respectively. the velocities and pressure profiles and shear distributions have been obtained and they were compared due to the different flow field. it is concluded that when no particles are deposited, the helical flow would lower the pressure on membrane surface to some little extent but not markedly
（ 1 ）對外軸向流和外切向流兩種方式下膜器環隙內流場進行變參數數值實驗，作出流場及切應力的分佈規律，分析無顆粒沉積時層流條件下流動結構對過濾通量的影響，認為：採用外旋流的方式將對膜面壓力有削弱作用，但並不明顯。 -
In this paper, the characteristics and details of the laminar flow fields in the annular gap of the modules were theoretically studied by numerical simulation method first time. the mechanism of the microfiltration with outside helical flow was analyzed. its results were compared with the former experimental results and those of outside axial flow mf and would provide the theoretical basis for optimization design
本文採用數值計算的方法首次對層流范圍內膜器環隙內的流場進行數值模擬，從理論的角度分析其流場分佈的細節和特點，與前人的實驗研究結果和外軸向流微濾進行比較，分析外旋流強化微濾的機理，對膜器優化設計提供理論依據。
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