surface coolant 中文意思是什麼
surface coolant
解釋
表面冷卻劑-
Disigning coolant channel on the firebox of liquid rocket engine to loxodrome ( equal - angle helix ) groove can improve firebox coolant capability greatly. because the width dimension of loxodrome groove is narrow and the depth is deep, some machining methods are incapable, such as end - milling or electrochemistry. according to the peculiarities, a cnc disk - cutter - milling method which is composed of five motion axes with four simultaneously interpolated ones is researched. because most firebox generatrix is composed of complex curves, it is very difficult to get cnc cutting program with manual means. in order to deal with the problem, the loxodrome mathematics model is studied, and an auto - programming software system is developed. the software system can generate cnc cutting program of loxodrome on many kinds of turned surface. the constriction - distension segment of firebox is the most representative workpiece. the sharp changing of its generatrix slope makes loxodrome milling difficult. with the theory analyzing and practice cutting experiment, some applied techniques, which include milling mode and direction, choosing cutter diameter and cutting start point setting, are developed. adopting the technology above, tens regular workpiece have been manufacturing. the two - year manufacture practice has confirmed the validity and feasibility of developed loxodrome coolant channel milling method. the developed technology is also worth to be referenced to other similar workpiece
將液體火箭發動機燃燒室的冷卻通道設計為斜航線（等傾角螺旋線）槽形，可以大幅度改善燃燒室的冷卻性能.斜航線冷卻槽的槽寬尺寸較小而槽深尺寸較大，所以無法使用棒銑刀銑削、電化學等加工方式.針對這些特點，提出了五軸控制、四軸聯動的數控片銑刀銑削加工方法.由於燃燒室外表面的母線輪廓復雜，手工編制數控加工程序難度大.為了解決數控加工程序的編制問題，研究了斜航線的數學模型，開發了自動編程軟體系統.使用該系統，可以生成多種母線輪廓回轉體外表面上的斜航線數控加工程序.燃燒室收斂-擴張段的母線斜率變化大，加工難度大，是斜航線冷卻通道加工的最典型工件.經過理論分析和實際切削實驗，研究了針對該類型工件的片銑刀直徑選擇、銑削方式和方向、刀具調整和起刀點的設置等多項實際的加工方案.採用上述的一系列技術，已經成功地加工了數十個合格工件.經過兩年多的實際生產過程應用，驗證了所開發的斜航線冷卻通道加工方法的正確性和可行性.這些加工技術的研製成功，對其他相似類型零件的加工亦具有參考意義 -
One cooling method that has gained increasing importance is endwall film - cooling, where coolant air is discharged though discrete holes in the inner and outer endwalls of a turbine blade passage. after leaving the holes, the coolant forms a protective layer between the hot mainstream gas and the surface that is to be protected
目前廣泛採用的一種重要冷卻方法是渦輪葉柵端壁氣膜冷卻，該方法中冷空氣穿過渦輪葉片上內外端壁離散冷卻孔進行交換，且冷空氣流經冷卻孔后在主流熱空氣與被保護表面之間形成保護層。 -
Emgrind 15 can act as a lubricant by reducing friction to guard the grind wheel from excessive erosion, and as a coolant to avoid heat distortion and surface damage
Emgrind 15不但具有潤滑性能降低摩擦，使砂輪不致過度磨蝕；並能產生冷卻效果，以避免工件的熱變形與表面損傷。 -
Wet grinding is adopted within the possible range if it cannot help, a spray or air will be blew and delivered. because coolant will have a lot of influence on the roughness of grinding surface, surface precision, wheel sharpness and wheel life
在可能范圍內採用濕式研磨為宜若不得已，加噴霧或空氣吹送，因研磨液對研磨加工面粗度表面精度砂輪銳利性及砂輪壽命都有很大的影響。 -
The experiment results indicate that 90 % pressure drop is attributed to minor pressure drop in heat sink and these results are higher than the theoretical value. the thermal resistance will drop with the increasing of pumping work and the extent of the drop will decrease when the pumping work reach some value. the maximal temperature difference between the heat - sink surface and the coolant will increase with the increasing of heat fluxes, as is same to the maximal temperature difference on the heat - sink surface
研究表明，在微射流熱沉中，熱沉總阻力主要是由局部阻力引起的，佔到熱沉總阻力的90 % ;微射流陣列冷卻熱沉熱阻隨泵功的增加而減小，但是當泵功增加到一定程度時，熱阻變化趨于平緩;熱沉散熱片底面溫度和溫差隨熱流密度增加而升高，但是溫差保持在一定范圍之內。
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