轴向磁化双环嵌套磁场的解析模型及其应用

Analytic Model and Application of the Axially Magnetized and Bi-annular-shaped Magnetic Field

以在线式全流量可视铁谱仪为背景,对静磁场的磁路进行设计,采用轴向充磁,双环异极嵌套的安装方式,两环间隙用不导磁材料做成的圆环作为衬套,并从磁荷模型出发,利用标量磁位法,并引入广义二项式定理分别对同心双环嵌套磁体、偏心双环嵌套磁体产生的磁感应强度进行解析计算,通过对比磁感应强度的理论值和实际测量值发现解析表达式很好地反映出静磁场的磁感应强度分布规律,并对误差进行分析。同时,通过对比这两种磁体的磁感应强度的分布,选择合适的静磁场以满足在线式全流量可视铁谱仪在润滑油高流速条件下有效吸附铁磁颗粒的要求。在此基础上,将所设计的静磁场应用到某新型涡喷航空发动机性能监测中,对监测到的磨粒进行分析,分析结果间接验证所设计的静磁场在润滑油高流速条件下吸附铁磁颗粒的有效性。

As the background of a new inline full flow visual ferrograph,the magnetic circuit of the static magnetic field is designed,which is axial magnetized and is dual-rings nested assembly with different pole and is filled with non-magnetic materials as the bush between the rings.Starting from the magnetic charge model,combined with the scalar magnetic potential method and the generalized binomial theorem,the magnetic induction of the concentric nested dual-rings,and the eccentric nested dual-rings is respectively analytically calculated.Comparing the theoretical value of magnetic induction with the actual measured value shows that the analytical expression well reflects the rules of magnetic induction in the static magnetic field,as well as the error is discussed.At meanwhile,compared the distribution of magnetic inductions of the magnets mentioned above,the most appropriate static magnetic field is chosen to meet the need of effectively adsorbent ferromagnetic particles in the inline full-flow under the condition of the high volume of lubricant oil flow.On this basis,the designed static magnetic field is used in monitoring the performance of a new turbojet aero-engine,and then the collected debris is analyzed.The analytical result indirectly verifies that the static magnetic field can effectively adsorb ferromagnetic particles under the condition of the high volume of lubricant oil flow.