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To reveal aft end internal flow feature of a solid rocket motor with submerged nozzle, a two dimension cold flow test model with rectangular channel was designed The cold gas simulation was based on geometric similarity and aerodynamic analogy Mean and fluctuating velocity field was measured using phase doppler particle analyzer It showed that the flow separates at upstream of the submerged nozzle and reattaches on the tip of the nozzle nose A relatively steady recirculation zone formed in...

为了揭示含潜入喷管的固体火箭发动机尾部流动特征，按照几何相近和气动相似原则设计了通道为矩形的二维冷流实验模型，利用相位多普勒粒子分析仪对燃烧室尾部气流的时均速度和湍流脉动速度进行了测量。实验结果表明气流在潜入喷管入口上游发生分离，再附点位于喷管前端部外侧，背壁空腔内形成一个较为稳定的回流区，流场的轴向和横向湍流强度都比较大

Complete specifications and diverse shapes, square, pear, egg shape, heart-shaped, Ma eyes, trapezoidal, long rectangular, round, triangular, round ball, pillow-shaped, hanging guts, flower-shaped, gossip-shaped, diamond-shaped bridge , Ban Yuexing, four flower-shaped, and so on.

规格齐全形状多样，有方型、梨形、蛋形、心形、马眼、梯形、长方型、圆形、三角形、圆球形、枕形、吊胆、花形、八卦形、菱形、桥形、半月形、四花形等等。

Circular steel arch es are distributed along the short span of the shell as the main load-bearing component,while steel tubes of rectangular section are distributed as purlins between the arches along the long span.

为满足建筑设计简洁通透的要求，该工程采用了沿椭球面短轴方向布置圆形钢拱结构为主要承载构件、拱间沿长轴方向布置矩形钢管作为檩条的结构方案。

Circular steel arches are distributed along the short span of the shell as the main load-bearing component, while steel tubes of rectangular section are distributed as purlins between the arches along the long span.

为满足建筑设计简洁通透的要求，该工程采用了沿椭球面短轴方向布置圆形钢拱结构为主要承载构件、拱间沿长轴方向布置矩形钢管作为擦条的结构方案。

A fork waveguide model is proposed and the mode matching and multi-mode network technique are used to analyze the transmission characteristics of rectangular tunnel with metallic pit prop.

针对矩形巷道中由于金属支护立柱的存在而带来的分叉不连续问题，提出用分叉波导模型并用模式匹配法和多模传输理论分析传输特性。

A fork waveguide model is proposed and the mode matching and multi-mode network technique are used to analyze the transmission characteristics of rectangular tunnel with metallic pit prop.

针对矩形巷道中由于金属支护立柱的存在而带来的分叉不连续问题，提出用分叉波导模型并用模式匹配法和多模传榆理论分析传榆特性。

The nonlinear dynamic model of a thermo-mechanical coupling viscoelastic rectangular plate with temperature field and subjected to both actions of an alternating periodic transverse external excitation and in-plane uniform distributed force is established.

建立了横向周期荷载、面内均布荷载和温度场作用下，考虑热传导效应的粘弹性矩形板的热机耦合非线性动力学模型。

In this paper, in accordance with Biacob plate-bending theory, analytical solutions of bending problems of rectangular plates are presented.

本文根据符拉索夫平板理论，提出了矩形板弯曲问题的解答格式，应用本文中的(8)和(9)式，可求解通常边界条件下，承受横向均布力q_0以及承受横向均布力和板边法向弯矩等组合荷载共同作用下的矩形中厚板的弯曲问题，而且使这类问题的解析解规律化。

The utility model profiles is cross-section shaped that in the side,there is the lumen cross-section.vertical profiles of inter-connected connectors connects eucampia square plate-shaped nut screw connected to the bottom profile and the slot between the rectangular cross-section of the convex edge grip tightly, so to connect high strength, easy disassembly

本实用新型的型材是在侧面上有内腔横截面是工字型槽的型材，垂直连接的型材间有弯角连接件和方板形螺母用螺钉相连，可把型材槽底和槽口间的矩形截面的凸棱紧紧夹住，所以连接强度高，拆装方便

The shape of the stool is very rich in the early days is rectangular, has been extended to the Ming Dynasty to the Qing Dynasty to become a square, but also appeared fan-shaped, plum-shaped, hexagonal bench.

凳子的形状很丰富，出现的早期是长方形，一直延续到明代，到了清代变成方形，还出现扇面形、梅花形、六角形的凳子。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。