Numerical simulations were performed to illustrate the influences effects of annular-cooler surface roughness on wind resistance and thermal environment in a high-speed centrifuge chamber, with the use of multi-reference-frame (MRF) method and classical roughness-modified model. In the present study, the absolute roughness height was specified in a range form 0.05mm–2.5mm. With respect to the clearance between rotating-arm tip and stationary-cooler surface, the relative roughness height was changed from 0.0014 to 0.07 accordingly. The results show that the flow field inside the centrifuge chamber is of highly three-dimensional feature. With the increase of surface roughness, the wind resistance is increased monotonously. With regard to the thermal environment, the maximum temperature inside the centrifuge chamber takes on a non-monotonous variation along with the surface roughness height, due to the two contrary influencing roles of surface roughness on the viscous dissipation heat generation and the heat removal capacity. In general, the use of roughed cooler-wall is a promising scheme for reducing the environmental temperature in a high-speed centrifuge chamber. Under the present research conditions, a more favorable relative roughness height is identified in term of a comprehensive factor that reflects the benefit of roughed surface on the reduction of maximum environmental temperature at the pay of aerodynamic penalty.

利用多参考框架（MRF）方法和经典的粗糙度修正模型，进行了数值模拟，以说明环形冷却器表面粗糙度对高速离心室风阻和热环境的影响。在本研究中，绝对粗糙度高度指定为 0.05mm–2.5mm 的范围。对于旋转臂尖端与固定冷却器表面之间的间隙，相对粗糙度高度相应地从0.0014变为0.07。结果表明，离心室内的流场具有高度的三维特征。随着表面粗糙度的增加，风阻单调增加。关于热环境，由于表面粗糙度对粘滞散热和散热能力的影响作用相反，离心室内的最高温度随着表面粗糙度的高度呈现非单调变化。一般来说，使用粗糙的冷却器壁是降低高速离心机室环境温度的有前途的方案。在目前的研究条件下，根据综合因素确定了更有利的相对粗糙度高度，该综合因素反映了粗糙表面对降低最高环境温度的好处，同时付出了空气动力学代价。一般来说，使用粗糙的冷却器壁是降低高速离心机室环境温度的有前途的方案。在目前的研究条件下，根据综合因素确定了更有利的相对粗糙度高度，该综合因素反映了粗糙表面对降低最高环境温度的好处，同时付出了空气动力学代价。一般来说，使用粗糙的冷却器壁是降低高速离心机室环境温度的有前途的方案。在目前的研究条件下，根据综合因素确定了更有利的相对粗糙度高度，该综合因素反映了粗糙表面对降低最高环境温度的好处，同时付出了空气动力学代价。