在平面内角的终边绕角的顶点旋转时，可以有两个不同的方向，一个是逆时针方向，一个是顺时针方向，沿逆时针方向旋转生成的角规定为正角；沿顺时针方向旋转生成的角则规定为负角。
经联合造型后的叶栅与原始叶栅相比在各个攻角下的流动损失均有大幅度降低，大负攻角下效果尤为明显。
The combination of the slot with an optimized blade design significantly reduces the secondary flow losses compared to the original turbine stator, especially at large negative angles of incidence.
论述了径向负前角硬质合金滚刀的设计及切削条件。
Design and cutting condition of carbide hob with radial negative front Angle were discussed.
本文还介绍了为提高复合片钻头经济指标的诸钻头参数设计的理论根据，如负前角、旁通角、出露高度、复合片布置等等。
The present paper also introduces the theory for the design of bit parameters in order to improve the economic target, such as negative rake angle, bypass angle and the exposure height.
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