在实测了淬火油换热系数的基础上，对轴对称空心圆柱体淬火时的温度场和组织场进行了模拟。

After determining the heat transfer coefficient of oil, the temperature, microstructure and stress variations during quenching were analyzed.

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叶轮结构由特殊材料制作的一空心圆柱体，安装在主轴总成上端轴头上，用圆锥套和键联接传递钮距，高速旋转。

The structure of impeller made by special material a hollow cylinder and installed in spindle assembly with cone at the top of the head, axial and key connection from, high-speed transfer button.

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所以空心的圆柱体在和，实心的圆柱体比时都会输，与半径长度无关。

So the hollow cylinder will lose in any race against a solid cylinder regardless of mass, regardless of radius, regardless of length.

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