几何截面

可变几何截面增压器/废气再循环对重型柴油机性能和排放的影响

Effect of VGT / EGR system on performances and emissions of heavy-duty diesel engine

主要工作有：1.提出了一种轴向移动喷嘴叶片可变几何截面增压器的新结构方案。

The main work is as follows : 1 . A new kind of axially movable vane turbocharger was presented , and its structure was investigated .

采用准一维流动方程，建立了燃烧室性能分析模型，考虑了加质、变几何截面、摩擦作用、化学反应等冈素的影响。

Combustor performance analysis model was established based on quasi 1-D flow equation , considering mass injection , variance of cross section , skin friction , chemical reaction and so on .

通过金相及电镜断口分析，确定箱体失效系铸造缺陷和几何截面差过大所致。

Failure of cast aluminium alloy box was analysed by metallographic and fractographic analysis , and cast defect and variation of cross section thickness were identified as main causes of failure .

表面电荷的非对称分布显示偶极子和多极子杂化模式出现在这些结构的几何截面，且薄边附近的电场增强很大。

From the surface charge asymmetry distribution , we can see that dipolar and multiple hybridized modes exist in the cross section of this structure , and the electric field adjacent thinner side sharply enhance .

虚拟层合单元能够简单有效地描述水下悬浮隧道的复杂几何截面形式，采用比较少的单元即能得到比较满意的水下悬浮隧道空间应力。

It was found that the virtual laminated element could effectively describe the complicated cross section of the submerged floating tunnel , and the relatively satisfactory spatial stresses could be obtained by fewer virtual laminated elements .

本文就新开发的轴向移动喷嘴可变几何截面增压器的构造、叶片形状、以及该增压器的发动机匹配性能和喷嘴流动损失进行了详细的研究。

A new type of axially movable vane turbocharger was developed in this dissertation . The structure of the nozzle , shape of vane , matching performance with a diesel engine and nozzle static pressure air blow test were investigated in detail .

控制系统基于Motorola68HC11系列8位单片机为核心的电控单元，用汇编语言编程，实现了柴油机油量和可变几何截面涡轮增压器的控制。

The control system was based on the 8 ? bit electronic control unit ( ECU ) system and the assembly language was used to design the software for controlling the engine fuel quantity and the turbocharger of the variable geometry turbine for the heavy duty diesel engine .

内燃机气门几何开启截面的计算

The Valve Opening Area Calculation of Internal Combustion Engine

选择了固定几何流通截面的双模态超燃燃烧室模型，采用气动热力调节的方法（即调节燃料喷射方式和燃烧速率）来实现双模态、宽马赫范围工作。

A fixed geometric , dual mode supersonic combustor was selected and the thermodynamic adjustment method , which means the adjustment of the way of fuel injection and heat release rate of combustion , was adopted to realize dual mode combustion with a wide range Mach number .

影响铝合金轴心受压构件稳定的因素很多，包括材料因素、初始几何缺陷、截面形状、板厚偏差、力学缺陷等。

There are a lot of factors influencing the stability of aluminum axial compression members , such as material properties , initial geometric imperfections , section profile , thickness deviations , mechanical imperfections , etc.

用几何规划求解梁截面尺寸优化设计

Solution to the Problem of Optimal Design of Cross-Sectional Sizes of Beam Element by Geometric Programming

并分析了管道的几何参数（横截面面积、管道中心线的曲率和挠度）对复速度势渐近展开的各阶项的影响。

The influences of the duct 's geometric parameters ( the area variation of the cross section , the curvature and torsion of the central line ) to the asymptotic expansion of the solution are analysed .