As we know, inverse techniques make blade ' s profile well compatible with its surface velocity distribution, however, they give designers big challenges that the ideal velocity distribution is hard to obtained and sometimes the non - physical solution, such as double covering of flow field or unclosed profiles, would come out. the proposed design procedure in the paper has avoided the disadvantage mentioned above. in this paper, a quasi - irrotational equation is used to describe the flow in cascade instead of the generally used irrotational equation
眾所周知,一般的反問題和混合問題的最大特點,是在給定的壓力面和吸力面上的壓力分佈或速度分佈條件下,直接得到葉
片的幾何形狀,它可以使葉型型面與表面氣流參數有機結起來;其不足之處在於,對設計者而言,很難給定理想的葉
片表面壓力分佈或速度分佈,並且有時會得到一個非物理解,如:得出的初始葉型可能會出現前緣、
尾緣不封閉的現象。
Numerical research on fins to alleviate draft tube surging
設置消減壓力脈動穩流
片后
尾水管數值解析
I remember the bright - red tobacco tin, with a picture of queen victoria ' s partner, prince albert, dressed in a black dress coat and carrying a cane
我還記得那鮮紅的煙絲盒,上面有一張維多利亞女王的丈夫阿爾伯特親王的圖
片,他身穿黑色的燕
尾服、手拿一根拐杖。
I remember the bright - red tobacco tin, with a picture of queen ' s victoria ' s partner, prince albert, dressed in a black dress coat and carrying a cane
我還記得那鮮紅的煙葉罐頭,上面有一張維多利亞女王的丈夫阿爾伯特親王的圖
片,他身穿黑色燕
尾服,手拿一根手杖。
With infrequent visits, comet kiess can ' t build up a broad dust band, and only generates a narrow trail of debris each time
由於琪斯彗星很少光臨,它無法形成一條寬闊的塵埃帶,而每次只能產生一條狹窄的由碎
片組成的彗
尾。
Finite element analysis of empennage of a special bullet
某型特種彈
尾翼
片的有限元分析
This sequined fishtail skirt is gorgeous
這件鑲亮
片的魚
尾裙非常出色。
Put the cracked ice into a highball glass. add the vodka and lime juice, stir and top with ginger beer. decorate with a lime slice and a lime rind spiral
首先將碎冰放入雞
尾酒杯。隨后加入伏特加和青檸檬汁,攪拌均勻後用姜啤續杯。最後用切
片好的青檸檬和切成螺旋狀的青檸檬皮裝飾。
The coastal wetlands of china ' s yellow sea, where the satellite - tracked godwits landed, are no exception : large areas of coastline continue to be reclaimed for agriculture, industry, urban expansion and other development ? an estimated c. 37 % of intertidal areas have been lost since 1950
國際鳥盟新聞里有這么一段話:衛星追蹤斑
尾塍鷸的停留地? ?中國黃海沿海濕地,也面臨著巨大的威脅:大
片海岸土地被持續開發成農田,工業用地和城市建設用地等等。
Compared to an ordinary rudder, the value of lift coefficient of ichthyoid rudder is about 30 % higher and the maximum rudder angle of it nearly reaches 45 degrees. ichthyoid rudder is a design under such a conception as to effectively utilize the propellers slipstream for rudder action, and featured by having a fish - shaped one - piece construction that is to say - no part of ichthyoid rudder can move in the water
其研究的魚形舵是一個沒有在水下移動的魚
尾形剖面單
片結構,增加了全舵的剖面拱度,使螺旋槳
尾流的折射水量增強,進而增大了水動力的作用,使之比普通流線形舵的升力提高30左右。
On the 3rd of march all the rooms of the english club were full of the hum of voices, and the members and guests of the club, in uniforms and frock - coats, some even in powder and russian kaftans, were standing meeting, parting, and running to and fro like bees swarming in spring
三月三日,英國俱樂部的各個廳中都聽見一
片嘈雜聲,俱樂部的成員和客人們穿著制服燕
尾服,有些人穿著束有腰帶的長衫,假發上撲了香粉,就像一群在春季遷徙時節紛飛的蜜蜂似的往來穿梭,一會兒坐著或站著,一會兒集合或散開。
Above the skeleton of a fallen leaf stalks the dark shape of a spider out hunting for springtail or mite or whatever tiny invertebrate strays its way
在一
片落葉的葉脈上,潛伏著一隻蜘蛛的黑影,它正準備獵捕彈
尾蟲、蟎蟲,或是任何一種迷路的微小的無脊椎動物。
Severe “ whiptail ” condition in field specimen from and acid soil. bare midribs or very narrow residual lamina
甘藍缺鉬「鞭
尾癥:在田間試驗和酸性土壤上有嚴重的鞭
尾癥狀,中脈突出,狹小的葉
片殘留。
Detail of young leaves and growing point ; many leaves reduced to bare midrib or narrow green corrugated residue of lamina ; youngest leaves and growing point brown and dead ; large green stipular lamina around crown
缺錳甘藍的「鞭
尾癥:關鍵在於嫩葉和生長點,許多葉
片露出中脈或縮小成綠色波狀的薄層殘留,心葉和生長點變褐並死亡,頂部周圍有大量綠色長有托葉的葉
片。
Ophichthidae possess similar morphological or osteological characters, so more difficult to be identified
但其外形相似,又缺少鱗
片、腹鰭和
尾鰭等結構,鑒別特徵較少。
Television pictures showed that three tiles had vanished from the right side of the rear engine cover.
電視畫面表明,有三塊瓦
片從
尾部發動機艙蓋右側脫落。
Villagers grab the line around the fluke of the whale and haul away with shouts and laughter
他們抓住繞在鯨魚
尾片上的繩子,又叫又笑地向岸上拉著。
A short, blank strip of film at the end of a reel
尾片在一盤影片末尾的簡短的空白的電影片斷