冲角

Base on incidence angle theory together with objective function with small design variable, computing time is reduced rapidly when Hooke-Jeeves method is applied in optimization design.

建立在转轮进口冲角理论基础上和以较少的权系数为设计变量的目标函数的Hooke-Jeeves优化方法极大地缩短了获取反击式优秀转轮所需的计算时间。

The influence of tailboard on the exit flow fields of compressor cascades with normal straight, positive and negative curved blades were investigated at zero incidence.

进行了带尾板的常规直叶片、正弯曲叶片、反弯曲叶片组成的三种矩型压气机叶栅在低速风洞上的实验研究，测量了叶栅出口流场，分析了零冲角下尾板对叶栅出口能量损失分布情况和二次流速度矢量的影响。

The experiment was investigated on the exit flow fields of compressor cascades with normal straight, positive leaned, positive curved, negative curved, and S type curved blades with tailboard at zero incidence.

进行了带尾板的由常规直叶片、正倾斜叶片、正弯曲叶片、反弯曲叶片、S形叶片组成的 5种矩型压气机叶栅在低速风洞上的实验研究，测量了叶栅出口流场，分析了零冲角下不同叶片弯曲形式对叶栅出口总压损失分布情况和主流速度的影响。

The effects of Reynolds number (from 800 to 2 000), the attack angle (30° and 45°) of delta winglet vortex generator are examined.

计算了Re（为800~2000）、三角形小翼型涡发生器的冲角（分别为30°和45°）对管－翅表面平均Nu、压降的影响，并利用场协同原理进行了分析。

In addition, the computational evaluations indicate that the heat transfer enhancement of delta winglet for aligned tube bank heat exchanger is more significant than that for staggered tube bank heat exchanger, the heat transfer enhancement of delta winglet with the attack angle of 45° is more obvious than that of 30°; the delta winglet with the attack angle of 45° leads to an increase in pressure drop, while the delta winglet with the attack angle of 30° results in a slight decrease.

另外计算还发现：三角形小翼对顺排换热器的强化换热效果好于对叉排换热器的强化；冲角为45°的三角形小翼强化换热效果好于冲角为30°的三角形小翼；冲角为45°的三角形小翼导致空气压降提高，而冲角为30°的三角形小翼则可使压降有所减小。

Unusial beakhead.

独特的冲角。

The results indicate: diversion shell can transform the kinetic energy of fluid into pressure energy well, and eliminate the circumferential component of fluid; the inlet incidence angle of vaned diffuser increases at the condition of O.8Q, and it results in flow separation very likely and the hydraulic loss increases; it is nearly non-impact inflow at the condition of 1.2Q, and the velocity distribution is uniform at the inlet of vaned diffuser and flow separation dose not appear.

结果表明：导流壳能很好地将叶轮中流出的流体的动能转化为压能，并消除速度的圆周分量；在0.8Q工况下，空间导叶的进口冲角增大，容易在空间导叶背面产生流动分离，造成水力损失增加；在1.2Q工况下，空间导叶的进口接近无冲击入流，在进口处流速分布较均匀，其内部未发生流动分离现象。

Two numerical analyses of isolated airfoils under different incidences show that the results of computation using the embedded H-grid are in good agreement with experimental data.

本文对两个孤立翼型在不同冲角下的流场进行了数值分析，采用嵌入式H型网格所得的计算结果与实验值相符很好。

It shows that the Creep Center Method can be applied to different kinds of bogies and different track parameters for the calculation of guiding forces and the attack angles, and is well suited for the studying of rail wear in the track maintenance divisions.

计算结果表明，运用蠕滑中心法可以对不同的转向架、不同的轨道几何条件进行曲线通过导向力和冲角的计算。为研究钢轨侧磨的规律提供了依据，在工务部门有较好的实用性。

The numerical analysis shows that the forward-curved impeller can make full use of the capability of fitting the negative incidence range and its internal flow performance is better than that of the baseline, and the forward-curved swept-back impeller can improve effectively the serious separation near the shroud and hub occurred in the baseline.

数值分析表明：前弯叶轮充分利用了其对负冲角工况的适应能力，内流特性优于常规设计的近似径向进口型线叶轮；而进一步发展的前弯后掠叶轮明显改善了原型叶轮轮壳和轮毂处严重分离的现象。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。