【摘要】 为改善等离子枪体结构设计,使枪体冷却系统更加完善,用ANSYS有限元分析软件对等离子枪体内部的三维流场和温度场进行了模拟计算,得到了枪体内部的三维温度场与流场分布图.在温度场分布图中,枪体高温区域在钨极起弧处及其周围区域,但高温区域并不是轴对称的,而是向着喷嘴起弧点偏斜.通过对枪体内部流场的矢量分析及作特征点的流速曲线图,确定了冷却水道的两个涡流区,结合温度场分布图,得出等离子枪体工作时最薄弱处为靠近喷嘴起弧位置的水道死角.最后,提出消除或减弱冷却薄弱部位的方法,以提高等离子枪的使用寿命.更多还原

【Abstract】 To improve the structural design of plasma spraying gun and make the cooling system of the gun more proper,the three-dimensional fluid field and temperature field inside plasma spraying gun were calculated approximately based on ANSYS software,and then the distribution diagrams of three-dimensional fluid field and temperature field inside the gun were gotten.It can be seen in the distribution diagram of temperature field that the high temperature area was emerged around the arc starting spot on tungsten electrode,but it was inclined towards the arc starting spot at gas nozzle rather than axisymmetric.The eddy flow area at the corner of cooling tube was discovered through the vector analysis of fluid field inside the gun and velocity graph of characteristic points.Associated with the distribution diagram of temperature field,it was found that the weakest area inside the gun during operation of plasma spraying gun was the corner of cooling tube near the arc starting spot of gas nozzle.Finally,it was put forward that either eliminating or lowering the corner could increase the operating life of the plasma spraying gun.更多还原