Visualization of flow behavior in rotating coaxial cylinders with axial slits
Visualization of flow behavior in rotating coaxial cylinders with axial slits
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DOI：
10.1299/transjsme.16-00551
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Yuasa;Y. Abe;S. Hirano
中科院分区：
文献类型：
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作者：
T. Yuasa;Y. Abe;S. Hirano
为了提高电动汽车（EV）的性能，设计适合散热的电机形状是很重要的。典型的EV电机由一对同轴的圆筒组成，该圆筒具有固定的外圆筒（定子）和旋转的内圆筒（转子）。一些EV电机在定子壁上具有轴向狭缝。本研究通过实验阐明了内部形状对电动汽车发动机内流动行为的影响。我们将测量区域分为三个区域：差距区域、转子端部区域和差距端部区域。流动行为由高速摄像机记录，并通过PIV测量。利用流量计薄片观察了差距和转子端部区域的流动特性。在无狭缝和有狭缝的两种情况下，在差距区域观察到泰勒-库埃特流。在转子端部区域，观察到了从外筒向内筒湍流流动的旋涡。注入差距的白色染料保留在没有狭缝的情况下的注入点。然而，对于具有狭缝的情况，染料从差距区域移动到转子端部区域。在静叶壁上的狭缝中观察到了指向旋转轴的涡结构，从差距区域到转子端部区域，涡具有轴向速度。
Toward the improvement of performance of an electric vehicle (EV), the design of the motor shape appropriate to heat removal is important. A typical EV motor is composed of a pair of coaxial cylinders with a fixed outer cylinder (stator) and a rotating inner cylinder (rotor). Some EV motors have axial slits on the stator wall. The present study experimentally clarifies the influence of inner shape on flow behavior in the EV motor. We divided the measurement area into three regions: the gap region, the rotor end region, and the gap end region. The flow behavior was recorded by a high-speed video camera and was measured via PIV. The flow behavior in the gap and rotor end regions were observed by Kalliroscope flakes. Taylor-Couette flow was observed in the gap region for the both cases without and with slits. In the rotor end region, the vortex that spirally flows from outer cylinder to the inside cylinder was observed. The white dye, injected in the gap, remained at the injection point for the cases without slits. However, the dye moved from the gap region to the rotor end region for the cases with slits. The vortex structure directed to the rotating axis was observed in the slit on the stator wall; the vortex had the axial velocity from the gap region to the rotor end region.