downstream pressure 中文意思是什麼

downstream pressure 解釋
活門后壓力
  • downstream : adv. ,adj. 順流（的）；在下游（的）。
  • pressure : n 1 壓；按；擠；榨。2 【物理學】壓力，壓強；大氣壓力；電壓。3 精神壓力，政治[經濟、輿論等]壓力。4...
  1. Thus it was demonstrated that the main pressure zone was little affected by the downstream flow condition.

    由此可見，下游的流動情況對主要壓力區幾乎沒有影響。
  2. It is possible for the feed system to have a low impedance, looking downstream from the pressure source at a certain frequency.

    在壓力源下游，供應系統在某一頻率下可能有一低的阻抗。
  3. The gips / gdps series of automatic shut - off valves are safety devices designed to stop the flow of gas when the downstream pressure of the valve reaches a value larger than and / or smaller than the preset operating limit

    升壓感應關斷型?與gdps ?降壓感應關斷型?系列自動關斷閥為安全設備，設計當此閥下游壓力達到大於或?和?小於預定操作限度的壓力值時，來中斷瓦斯流動。
  4. These measurements are complemented by measurements of the flow field downstream of the cascade. the integrated losses and locations of secondary flow features with and without endwall film - cooling are determined for variations of both coolant supply pressure and injection location

    以無端壁氣膜冷卻和有端壁氣膜冷卻兩種情況進行研究，對比地獲得了兩者的綜合損耗和二次流特徵區域隨冷卻氣體供給壓力和注射位置的變化規律。
  5. ( 2 ) on the leading edge, the film cooling effectiveness at the zone immediately downstream of the cooling holes is affected by blowing ratio and mainstream reynolds number, while the effects are not important in the downstream zone far from the cooling holes. ( 3 ) on the front half of pressure surface, the effectiveness increases with decreasing blowing ratio at the downstream near the cooling row and it is contrary at the downstream far from the cooling row. ( 4 ) on the rear pare of the pressure surface, the effectiveness decreases with increasing blowing ratio and does not vary so much downstream in the cases of higher blowing ratio

    研究結果表明葉片吸力面端壁附近區域壓力系數分佈呈現出較強的三維特性，動葉吸力面尤其明顯；氣膜孔流量系數隨吹風比的增加而增大，在高吹風比情況下，流量系數逐漸趨于常數；在不同型面區域，冷卻效率分佈有較大的差異，而且吹風比與主流雷諾數的影響程度也不盡相同；低吹風比下，孔出口下游附近可以得到較好的冷卻，中、高吹風比下，冷氣射流在加速流動主流的作用下返回壁面進行二次冷卻，孔下游較遠區域可以得到較好的冷氣覆蓋。
  6. Based on experimental result of energy dissipation and scour protection for downstream of spillway at yu jian kou power station, this paper discusses the flow characteristics, aerated characteristics of flaring gate pier for low dam pivot, the influence on pressure of dam surface and the result of energy dissipation for flaring gate pier. it is put forward to be an available method to solve the problems of energy dissipation and scour protection for depth of covering strata, poor geologic condition and weakness of resistance to scour capability under reasonable use of flaring gate piers and auxiliary dissipaters. thus, a new method is obtained for release of floodwater and energy dissipation of low dam pivot which are provided with low water head, great unit discharge and low froud coefficient. it may be used for reference for design and test workers

    結合魚劍口電站壩下消能防沖試驗研究成果，對低壩樞紐寬尾墩的水流特點、摻氣特性、寬尾墩對大壩泄流能力和壩面壓力的影響以及寬尾墩的消能效果等問題進行了初步探討，提出了合理地使用寬尾墩結合輔助消能設施可有效地解決壩下覆蓋層深，地質條件差，抗沖能力弱的低壩樞紐的消能防沖問題，從而為具有低水頭，大單寬流量，低佛氏數特點的低壩樞紐泄洪消能開辟了一條新途徑，可供有關低壩樞紐設計與試驗工作者借鑒與參考
  7. The measurements of discharge coefficients and pressure coefficients along the models with aspect ratios of 0. 5, 1. 0 and 2. 0 were carried out under various aerodynamic and geometric parameters ( reynolds numbers : 20000, 40000, 60000, 80000 ; suction rates : 0. 3, 0. 45 and 0. 6 ; rib angles : 45, 60, 90, 120 ; rib height - to - width ratio h / e : 1. 0 and 2. 0 ; film hole location : middle of ribs. upstream of ribs and downstream of ribs ). based on the abundant experimental data and figures, rules of discharge coefficients and pressure coefficients in dependence of geometric and aerodynamic parameters were given out

    根據實驗課題的要求，在寬高比分別為1 . 0 、 2 . 0和0 . 5的內流冷卻通道里，在不同的氣動和幾何參數（雷諾數re分別為20000 、 40000 、 60000 、 80000 ，出流比sr為0 . 3 、 0 . 45和0 . 6 ，肋角分別為45 、 60 、 90 、 120 ，肋高h e分別為1 . 0和2 . 0 ，孔位分別為肋中間、肋下游和肋上游）的情況下，對流量系數和壓力系數以及流場進行了實驗研究，獲得了大量的實驗數據和圖形，較為詳細地給出了流量系數和壓力系數隨不同氣動參數和幾何參數而變化的規律。
  8. The shearing layer is carried by the jet and the eddy is formed because of the instability and selective amplification of shearing layer which will propagate to the downstream. as the eddy impacts the impinging wall, a wave of pressure disturbance with certain frequency is induced. this wave then propagates to the upstream with high speed, and results in the overlap and amplification of the waves when the frequencies of them are close with each other

    當前噴嘴流束中的不穩定擾動波在穿過腔內的剪切層時，剪切層對其有選擇放大作用，形成渦環結構，剪切流動中渦環與碰撞壁撞擊，在碰撞區域產生壓力擾動波並向上游反射，在上游剪切層分離處誘發新的擾動的產生，當新擾動與原擾動匹配時，射流上游就被不斷地受到周期性激勵，腔內就產生流體自激振蕩並在後噴嘴出口形成脈沖射流。
  9. Series installations are recommended where very high supply pressure must be reduced to a very low downstream pressure. reducing the pressure in stages eliminates whistling and noise

    如果很高的供應壓力必須降低到很低的下游壓力，則建議採用串聯安裝方式。逐步減低的壓力避免出現嘯聲和噪音。
  10. It was founded that the flux increases as the feed temperature, concentration and flow rate increase, and increases as the downstream pressure decreases. the separation factor increases as the feed flow rate and downstream pressure increase, and decreases as the feed temperature increases

    由試驗結果表明，溫度升高，增大料液濃度，降低冷側壓力，以及增加料液流速，膜蒸餾通量增大；同時流速提高，溫度降低，以及增大冷側壓力，分離因子增大。
  11. Abstract : wind tunnel experiments were carried out to investigate the influence of wind direction on the wind pressure of proximite buildings. mean and fluctuating pressure coefficients on a high building, at sixteen different wind incidences and with one and two interfering buildings, were measured in the tests. this paper presents the characteristics of wind pressure on the building, which varies with the incident wind angle and with the numbers of adjacent buildins. due to the variation of wind angle and the interference effects, the complex feature of pressure distributions can be found on the downstream building surfaces for building group arrangement at certain angle of wind attack. some area of the interfered building for such configuration, in comparison with one single building ' s, may undergo very strong positive or negative pressures

    文摘:通過風洞實驗研究了風向對兩個和三個鄰近建築風壓分佈的影響特性.實驗結果給出了在不同風向角下，作用於受擾建築上的平均和脈動風壓系數.當受擾建築處于下游位置時，建築之間的干擾效應主要表現為遮擋影響，建築物上的總體風壓系數不是很大，但在建築物表面上有時會產生局部較大的負壓系數.另外，在某些風向角下由於受到上游分離氣流的影響，在下游建築的局部表面又會出現較大正壓.這些結果可供建築布置和結構設計時參考
  12. In balancing valve upstream and downstream ends of the tube with a hole, used to measure the fluid through valves pressure reduction

    在平衡閥的上游、下游端各裝一個測壓孔，用來測量流體通過閥門的壓降。
  13. At the toe of thc stepped spillway if exchange a series of steps for arc section, the highe enersy dissipation can be got bu the pressure is higher in downstream icction

    在壩趾處，不設反弧段比設反弧段時的消能率高，但壩下水平段的壓強值較大。
  14. For simulating the radial static pressure gradient behind the true turbine guide cascade in low speed wind tunnel with annular cascade, the backboards were placed in the downstream field of the guide model cascade of the low - pressure stage of a turbine, and the effects of the types and positions of the backboards on the outlet flow field of the model cascade were experimentally researched

    為在環形葉柵低速風洞實驗中模擬實際渦輪級靜葉后徑向壓力梯度，在某型渦輪低壓級靜葉的下游流場設置了擋板，實驗研究了擋板形式及設置位置對靜葉出口流場的影響。
  15. Abstract : this paper analyzes the reason of pressure drop increase of the downstream equipment - coldbox caused by water penetration of the molecular sieve in jngcc, summarizes the treatment, and gives recommendations

    文摘:對工廠生產中分子篩水「穿透」造成其下游裝置? ?冷箱阻力增大的原因進行了認真的分析，總結了處理方法及分子篩處理后的運行狀況，並提出了改進建議。
  16. Intercept the fluid medium upstream of the valve to be inspected with a shut - off valve and ensure that the subject valve is not under pressure ( vent downstream, if necessary )

    截取閥門上游的流體介質，用一個關閉閥門來進行檢測，確保相關的閥門不處在壓力下（如果必要的話，排除下游的流體介質） 。
  17. The most common method of determining maximum differential pressure across the valve seats is to assign the maximum design or operating pressure the upstream value p1 and assume a downstream pressure p2 of 0 psig

    測定閥門閥座的最大壓差的最常用方法是將最大設計或工作壓力作為上游的壓力值p1 ，然後假定下游壓力值p2為0psig
  18. In this paper, an experimental investigation of the removal of volatile organic compounds ( voc ) from dilute aqueous solutions was presented by vacuum membrane distillation ( vmd ). experiments were carried out using aqueous mixtures of ethanol with hollow fiber module. the influences of operating variables such as feed concentration, flow rate, temperature and downstream pressure on the flux and separation factor were investigated

    本文對膜蒸餾脫除水溶液中的揮發性有機化合物（ voc ）進行了試驗研究；文中以乙醇水溶液為研究對象，採用真空膜蒸餾法，膜材料為中空纖維膜，研究膜通量及分離因子與原料液的溫度、濃度、流速，冷側壓力的關系，並對真空膜蒸餾的傳熱傳質機理進行了初步探討。
  19. If the downstream system pressure is higher than the set pressure under no flow conditions, the cause could be thermal expansion, pressure creep or dirt / debris on the seat

    如果在無流量情況下，下游系統壓力高於設置壓力，則原因可能是熱膨脹，壓力蠕變或閥座上的污垢/碎片。
  20. To avoid this discharge, install a spring - loaded check valve ahead of the backflow assembly to " lock - in " the downstream pressure

    如果放置在坑內，則應該採取措施使得排放總是在地面上，或對于坑內排放，要確保在安全閥下方配置一個適當的氣隙。
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