以在线式全流量可视铁谱仪为背景,对静磁场的磁路进行了设计.采用轴向充磁,双环异极嵌套安装方式,两环的间隙采用不导磁的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,引入广义二项式定理对同心双环嵌套磁体产生的磁感应强度进行了解析计算.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了静磁场的磁感应强度分布规律.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了分析.分析结果间接验证了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.
With the background of a new online full flow visual ferrograph, a magnetic circuit of the static magnetic field is designed, it is axial magnetized, dual-rings nested assembly with different poles, and is filled with non-magnetic materials as the bush between the rings. Starting with the magnetic charge model, combining with the scalar magnetic potential method and using the generalized binomial theorem, the magnetic inductions of the concentric nested dual-rings are 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. On this basis, the designed static magnetic field is used to monitor 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.