## 3 Results and Discussion
### Relationship between Wind Resistance and Armature Geometry  
In the analysis described in Section 3.3, the shape (or pressure) component contributes predominantly to the torque resistance of the armature. Hence, the shape of the armature has a significant effect on the torque resistance. Given the impossibility of exhaustively examining every conceivable armature shape, we selected five typical armature geometries for comparative analysis, as shown in the accompanying figure. Here, Figure 14a represents the actual armature shape of the CHIEF device, Figure 14b depicts an armature with no chamfer treatment, Figure 14c shows an armature design with rounded filled corners, Figure 14d presents an armature with chamfers at the edges, and Figure 14e shows an armature in a disc-shaped configuration. Figure 13 shows the variation curves of torque resistance with angular velocity for the five aforementioned armature geometries. As shown in the figure, the torque resistances ranked from largest to smallest, corresponding to the armatures in the following order: Figure 14b features an armature with no chamfers, Figure 14a depicts the actual armature, Figure 14c displays an armature with rounded fillets, and Figure 14e presents a disc-shaped armature. Among these, the torque resistances under different angular velocities are relatively close for the armatures shown in Figure 14a-c. Figure 14d shows an armature with chamfers, which exhibits a notably reduced torque resistance with a maximum decrease of approximately 20% compared to the armature without chamfers, as shown in Figure 14b. However, this armature design has the disadvantage of having a smaller volume. If used as an armature in a supergravity centrifuge, it would significantly reduce the space available for the experimental capsules. Finally, Figure 14e indicates that the disc-shaped armature experienced the most significant reduction in torque resistance, with a maximum decrease of approximately 73% compared to the armature without chamfers in Figure 14b. This substantial decrease is mainly because of the absence of pressure-induced resistance in the disc-shaped armature, which only incurs frictional resistance. Figure 15 shows the vorticity cross-sectional contour plots of the flow field around different armature geometries at an angular velocity of 40 rads/s. The greater the vorticity, the larger the vortex losses within the flow field. In Figure 15, colors closer to red indicate higher vorticity values, whereas colors closer to blue indicate the lowest vorticity values. Large vorticity regions are concentrated in the vicinity of the armature and its wake area. By observing the images in Figure 15a-d, the high-vorticity regions gradually decrease. For a more direct comparison of the vorticity magnitudes among the different shapes, we calculated the volumetric average vorticity values. These values were found to be 263.8, 257.8, 235.7, and 129/s in Figure 15a-d, respectively. In descending order, the volumetric average vorticity corresponds to armatures with no chamfers, armatures with rounded fillet corners, armatures with chamfers, and the disc-shaped armature, which  
aligns with the descending order of torque resistance. Thus, we conclude that different armature geometries result in varying vorticities in the surrounding flow field. The greater the vorticity, the larger the vortex losses, and hence, the larger the torque resistance. In comparison, the disc-shaped armature exhibits a much lower vorticity in its wake flow field. Figure 14: Different armature geometries, where (**a**) is actual model, (**b**) is non-chamfer model, (**c**) is rounded filled model, (**d**) is chamfer model and (**e**) disc-shaped model. Figure 13: Resistance torque versus angular velocity for different armature geometries. To analyze the impact and contributions of different parts of the armature on the torque resistance, the armature was divided into four segments: end wall surface, sidewall surface, top wall surface, and bottom wall surface, as shown in Figure 16a-d.