电除尘器内亚微米细颗粒物动态的可视化测试

为了研究电除尘器内气流场对细颗粒物捕集的影响，采用二维粒子成像测速法（2D-PIV）对电除尘器内亚微米细颗粒物的运动规律进行测试.实验中，采用艾灸烟作为示踪粒子，线-板式电除尘器板间距为200 mm，通过改变高压放电极或电晕放电极性进行实验.结果表明，对单线电极电除尘器施加50 kV高压时，线电极周围会形成4个涡旋.对双线电极电除尘器来说，由于涡旋的相互作用，会形成更多的涡旋，且分布在双电晕线之间的4个涡旋更加均匀对称.从涡旋形貌来看，正电晕或负电晕放电具有相似的涡旋分布，采用线电极或芒刺电极时，也具有相似的涡旋分布.采用双芒刺电极时，由于注入更高的放电能量，颗粒物速度大幅提高，最高值可达1.6 m/s，是一次流速的3倍.

nalysis of electromagnetic force in Wheel-drive PMSM with stator incline eccentricity

In order to research the effects of inclined eccentricity on the vibration and noise of Wheel-drive permanent magnet synchronous motor (PMSM), the electromagnetic force of Wheel-drive PMSM with inclined eccentricity was analyzed based ontheanalyticalmodeland the finite element (FE) model.Theeccentricities along the axialdirection were obtained according to deformation calculation of the motor in working conditions. Then, based on the analyticalmodelof static eccentricity, the electromagnetic force characteristicsof the motor with static eccentricity were analyzed and compared with those of motor under healthy. Besides, a3-DFE modelof 24-pole/27-slot Wheel-drive PMSM with inclined eccentricity was developedand both the unbalanced magnetic pull (UMP) and the electromagnetic force were analyzed withdifferent levels of eccentricity and incline angle. The simulation resultsshow that the motor with eccentricity produces new components of electromagnetic force. Simultaneously,the increase of eccentricitylinearly influences the amplitude oflow-orderspace harmonics,and the incline angle has a similar impact on UMP. For this reason, the vibration of motor will be exacerbated.