Then the nozzle was simulated to study the variation of its performance under different nozzle pressure ratios , flow conditions and with different configurations of the cowl 同时研究了不同的压强比,外流场条件以及喷管可调面罩结构等对喷管性能的影响。
Manufactures a wide variety of products for helicopters : audio systems , video systems , microwave systems , cowls , seats , battery kits , avionics consoles , and electrical systems . provides custom engineering services 为直升机配备系列产品：话音系统、图象系统、微波系统、座位、电池、航空电子设备操作台和电力系统等。
Swinging through this exit in the early morning hours i sometimes stumbled upon monsieur renaud who , wrapped in his cowl like a gluttonous monk , made overtures to me in the language of the sixteenth century 有时清晨从这个出口摇摇摆摆出来后我会同勒诺先生不期而遇，他像一个贪吃的修道士一样把自己裹在修道士的长袍里，用十六世纪的语言同我攀谈。
The stranger ascended a rough staircase , and before a table , illumined by a lamp whose light was concentrated by a large shade while the rest of the apartment was in partial darkness , he perceived the abb in a monk s dress , with a cowl on his head such as was used by learned men of the middle ages 桌子上有一盏灯，灯罩很大，把灯光都集中在桌面上，使得房间里其余部分相当黑暗，他看见神甫穿着一件和尚长袍，头上戴着中世纪学者所用的那种头巾。
A parametric analysis of the inviscid effects of leading edge sweep , sidewall compression , width - height ratio , cowl position and inflow mach number on spillage is finished . numerical simulations are completed for a series of inlets at various flight height and velocity . the research indicates that the area of spillage window , which is mainly determined by the position of the cowl , significantly influences the spillage characteristic of the scramjet inlet 阐明了侧板后掠的侧压进气道设计参数对构型溢流影响;对不同侧板配置方式的侧压式进气道进行了数值模拟,通过对比分析,发现由唇口板的位置所决定的溢流窗面积的大小对进气道溢流特性的影响显著。
In this thesis , hypersonic sidewall compression inlet ' s self - starting characteristics are numerical simulated and tested . with increasing mach number of inflow gradually , the hypersonic sidewall compression inlets can self - start . compared with the hypersonic sidewall compression inlet starting directly , characteristics are different . moving cowl , decreasing interior contraction ratio also can realize the hypersonic sidewall compression inlet ' s self - starting because of separation bubble on sidewall spilling out 其次,在数值模拟结果的基础上,设计了实验模型和装置并在马赫3 . 85的风洞中进行了移动唇口板减小内收缩比实现侧压式进气道自起动的风洞实验,验证了数值模拟的结果。
Firstly , the creation and rendering theory of 3d model is introduced , as a part of which the technique of substituting texture mapping for polygonal modeling is discussed in detail . bump mapping , as an emphasis , is studied to represent the concavo - convex detail of rivets and screws on the surface of first - segment , second - segment , third - segment and cowling of launch vehicle 首先,本文阐述了真实感三维模型生成理论,着重论述了采用纹理映射来代替多边形建模的技术,运用凹凸纹理映射技术来表现火箭箭体一子级、二子级、三子级和整流罩表面铆钉、螺丝钉和?架等表面细节。
It is no effect on a sidewall compression inlet ' s starting characteristics while a starting sidewall compression inlet is moved cowl to increase interior contraction ratio appropriately . back pressure effect on characteristics of self - starting for hypersonic sidewall compression inlet is tested in mach 3 . 85 wind tunnel . the hypersonic sidewall compression inlet with interior contraction ratio 1 . 24 can self - start . unstart hypersonic sidewall compression inlet caused by high back pressure can self - start by moving cowl to decrease interior contraction ratio 最后,实验研究了反压对侧压式进气道自起动特性的影响,内收缩比1 . 24的侧压式进气道可以实现自起动并且实验验证了由于反压过高而不起动的侧压式进气道,通过移动唇口板以减小内收缩比可以实现侧压式进气道的自起动。
