The blade inner channel cooling is a complex convection - conduction coupling problem. this thesis build a three - dimension. compressible turbulence model, and give a general solve method. with the geometrical model of the glossily rectangle straight channel, the rectangle straight channel with in - line arrays disturb plates, the rectangle straight channel with staggered arrays disturb plates, the rectangle straight channel with slant disturb plates, this thesis compute the flow and heat transfer condition when the cold air path though these channels, and gain the temperature field, pressure field, velocity filed, in addition. this thesis also analyze the influence of the different channel height, the different channel materials, the different channels, and gain the function relation between he nusselt number, friction factor and reynolds number. this thesis is emphasis on the new heat transfer enhancement structure, that is, disturb plates, with the comparison with the glossily channel and channel with pin fins, the heat transfer enhancement effect of the former is better, and the conclusion can be used in the design of aircraft blade
葉片內部通道冷卻是一個復雜的對流?導熱耦合傳熱問題,本文在分析葉片內部通道冷卻的流動與傳熱情況的基礎上,建立了三維、可壓縮紊流的物理模型,得到了通用的求解辦法;利用不帶擾流片的矩形直通道、帶順
排擾流片矩形直通道、帶叉
排擾流片、帶傾斜擾流片的矩形直通道的幾何模型,計算了冷卻空氣通過這幾種通道時的流動與換熱情況,得到了各種不同情況下計算區域的溫度場、壓力場、速度場;在此基礎上分析了不同的通道高度、不同的葉片通道材質對葉片內部通道冷卻的影響,並整理得到了各種通道形式下,努謝爾數和阻力因子與雷諾數的函數關系;本文重點研究了新型的葉片內部通道冷卻強化傳熱措施?帶擾流片的內部冷卻通道的強化傳熱效果,通過與光滑矩形直通道、帶針
肋通道的冷卻效果的比較,表明了這種新型鮚構的優勢,對于葉片內部通道冷卻結構的設計可以起到指導的作用。
Outback offers generous portions of american angus steaks & prime ribs imported from australia, australia baby back ribs, new zealand rack lamb, norwegian fresh catch fish, no rules cut lunches, aussie tizer and yummy desserts
除了正宗的美國牛
排,你還可以享受到澳拜客的招牌菜炸洋蔥花球、澳洲乳豬
肋排、紐西蘭羊
排、挪威三文魚、各式自選配料的美味漢堡及香甜可口的冰淇淋、餐后甜點等。
Please use the upper part of chump which will be more soft, or the lean part of the rib
選用五花肉上方的子
排骨質較嫩,或用
肋條中間較瘦的部分,質地較好,裡脊邊的小
排比較硬。
Use a square to align each rib at 90 degrees from the spars and perpendicular to the span
使用一個曲尺以從桅桿和豎直到跨度的90度
排齊每個
肋。
Its structural form was rib arch with simple hole and frame supporting
結構型式為單孔
肋拱、
排架支承渡槽。
A thin slice of meat, usually veal or lamb, cut from the leg or ribs
肉片,肉
排從腿部或
肋條處切割下來的薄的肉片,通常指牛肉或羊肉
It is a top load bridge with a clear span of 288m, which is maximum one of the same structural system in asia. the main arch rib uses 8 steel tube of 920mm joined by web members and transverse truss to form a space truss. the soldier piles on the arch are made of bent frame to make the shape both artistic and novel
梅溪河大橋為一凈跨達288米的上承式鋼管混凝土拱橋,是目前亞洲同類橋型中跨度最大的橋梁,其主拱
肋採用8根920mm的鋼管,通過腹桿及平聯形成鋼管混凝土空間桁架,拱上立柱亦採用鋼管混凝土
排架,造型新穎美觀。
The effects of various structure parameters and fins arrangement of the three dimensional extended surface on heat transfer performance in the 3 - d ift have not been studied systematically
特別是在三維內
肋管
肋形結構尺寸,
肋排列形式等影響管內對流換熱特性因素的系統研究工作還有待于進一步的完善。
3 - d ift have three fin arrangements : staggered arrangement fins, in - line arrangement fins and spiral arrangement fins. the former experimental study regressed the experimental data of all three fin arrangements and obtained the heat transfer criterion equation of 3 - d ift, while the paper sets apart the three mixed fin arrangements and applies othorgonal testing method to the 3 - d ift with staggered arrangement fins which is wide used in the engineering
原有的研究是將三種
肋排列形式三維內
肋管的實驗數據混雜在一起進行回歸得到三維內
肋管的換熱準則式,而本文則將原有研究中混雜不清的
肋排列的三種形式區分開來,並對其中在工程中應用最廣泛的
肋叉
排三維內
肋管進行了詳細的正交試驗研究。
This is our menu. our special for today is ribs
這是我們的菜單.今晚的特餐是
肋排
Not just any piece of meat, baby. a prime rib
可沒那麼簡單,我的寶貝對我來說你是上好的小牛
肋排
Want some ribs
來點肋排嗎?