共查询到18条相似文献,搜索用时 203 毫秒
1.
借助有限元分析与试验测量相结合的方法,分别研究了相同铁芯高度和安匝数下凸极式和环形式铁芯结晶器电磁搅拌器的内腔磁场和端部漏磁。研究表明,模拟结果与试验结果一致。在搅拌器内腔正中心沿拉速方向(轴向z)上,凸极式和环形式铁芯电磁搅拌器的磁感应强度变化趋势一致,都沿z轴正向变化平缓。而向铁芯表面逐渐靠近时,凸极式电磁搅拌器的磁感应强度沿z轴先逐渐增大,在距搅拌器水平中心面约150mm的铁芯端部达到最大峰值,然后由端部向外急剧降低,呈“山峰”状的分布趋势。在越贴近搅拌器铁芯表面处,这种磁场分布趋势越明显,即端部漏磁越明显。而与凸极式铁芯电磁搅拌器相比较,环形式铁芯电磁搅拌器的端部漏磁明显小很多。磁感应强度沿z轴的变化相对比较平缓,仅在线圈端部约225mm处出现一个较小的峰值,而后陡降,其分布呈“悬崖”状。 相似文献
2.
3.
重载链轮是冶金工程领域基础传动件之一,对其进行表面强化处理是提高寿命的重要手段。对链轮采用仿轮廓外形的线圈进行电磁加热可获得近似的仿齿形加热层。但是在圆环效应和邻近效应的综合作用下,磁场强度的不均匀分布成为链轮温度不均匀的根本原因,控制磁力线在空间中的合理分布仍是获取高品质加热质量的关键因素。研究了重载链轮感应加热机制,建立了多坐标精准控制仿真模型,分析感应线圈结构参数对加热质量作用规律,发现调整线圈角度、齿根半径、齿顶距离可使齿廓最大温度差比完全仿形线圈最高下降1/3。 相似文献
4.
5.
软接触电磁结晶器内三维弯月面形状数值模拟 总被引:13,自引:2,他引:11
建立了软接触电磁结晶器内交变磁场和三维弯月面形状的耦合模型,在用实验结果验证的基础上,模拟了方坯连铸结晶器三维弯月面形状,研究了弯月面形状的不均匀特性,讨论了感应线圈与初始钢液面之间的相对位置、电流强度和电源频率等因素对弯月面形状的影响。结果表明:当初始钢液面位于感应线圈中心位置附近时,电磁力对金属的约束成形作用最强;电流强度比电源频率能更明显地改变弯月面形状,但提高电源不仅能适当增加弯月面高度,还有利于弯月面的稳定,在实际应用中应采用20kHz以上的电源频率。 相似文献
6.
7.
8.
9.
10.
11.
12.
Finite Element Analysis of 3-D Electromagnetic Field in Bloom Continuous Casting Mold 总被引:2,自引:0,他引:2
Three-dimensional finite element model of electromagnetic stirrer was built to predict magnetic field in a bloom continuous casting mold for steel during operation.The effects of current intensity,current frequency,and mold copper plate thickness on the magnetic field distribution in the mold were investigated.The results show that the magnetic induction intensity increases linearly with the increase in current intensity and decreases with the increase in current frequency.Increasing current intensity and frequency is available in increasing the electromagnetic force.The Joule heat decreases gradually from surface to center of bloom,and a maximum Joule heat can be found on corner of bloom.The prediction of magnetic induction intensity is in good agreement with the measured values. 相似文献
13.
氯化物熔盐电解槽内部磁场的稳定对电流效率的提升非常重要。以50 kA氯化物熔盐电解槽为研究对象,运用有限元软件COMSOL建立电解槽三维电磁场模型,模拟了50 kA电解槽不同平面x、y、z三个方向的磁场强度和电磁力分布特点,重点研究工艺参数对磁场强度和电磁力分布的影响。结果表明,电流增加,每个平面的磁场强度和电磁力均增加,且增幅相同;降低极距、增加电解质液面高度、增加阳极半径均会使磁场强度最大值和电磁力最大值增加。 相似文献
14.
15.
利用有限元分析软件,建立了380 mm×280 mm大方坯结晶器电磁搅拌的三维数学模型,系统研究了电磁搅拌工艺参数(电流250~500 A,频率1.5~3.0 Hz,结晶器铜板厚度34~40 mm)对结晶器内电磁场的分布影响。结果表明,结晶器内磁感应强度沿铸流轴向呈"两端小、中间大"分布;电流从350 A增大到500 A,搅拌器中心的磁感应强度呈线性递增;频率由1.5Hz增大到3.0Hz,搅拌器中心磁感应强度仅减小0.001 5 T;随着结晶器铜板厚度的增大,铸坯宽面、窄面和角部的磁感应强度都减小。在实际连铸U71Mn重轨钢中,电流应该维持在400 A以上。 相似文献
16.
设计了一款多模式电磁搅拌器, 并利用有限元分析软件Ansoft Maxwell建立了多模式磁场电磁搅拌器的三维数值模型, 同时利用高斯计对实验平台的电磁场参数进行测量。将两者进行比较之后, 发现两者整体趋势一致, 数值偏差很小, 证明了数值仿真模型的准确性。最后, 利用搭建的三维数值模型, 研究分析励磁电流强度以及励磁电流频率对旋转磁场、行波磁场以及螺旋磁场的磁感应强度以及电磁力分布规律的影响, 以此达到优化工艺参数的目的。 相似文献
17.
The bulk metallic electromagnetic levitation technique has a promising application prospect in condensed physics and materials science. In order to resolve the problem of weak levitation force and the small size of samples, an optimized solution based on finite element analysis (FEA) is developed to seek the best electromagnetic field distribution in the levitation zone. The influence of material properties on the distribution of magnetic flux density, surface pressure, and the Lorentz force were studied by the FEA method with various sample sizes of titanium and copper balls. The levitation capability of cylindrical coil system which consists of a single-layer coil with an inner diameter of 30 mm and the levitated object with a diameter of 20 mm was analyzed. To keep a balance between the turn number and increment efficiency of force, the best number of 7 turns is confirmed. Then, two types of optimized coils were predicted by numerical simulations, and the levitation force is improved drastically. The double-layer coil displays an outstanding levitation capability owing to the strong electromagnetic field generated by multilayer turns. In addition, 5 to 50 g aluminum, titanium, copper, and nickel are levitated by the above three kinds of coils and the levitation capacities are validated from the recorded data of the minimum operating current that can levitate the samples. The experimental results show good agreements with the simulation results, and the minimum current for optimized coils is reduced efficiently. 相似文献
18.
将脉冲电流作用于铁素体不锈钢,发现经过脉冲电流处理后等轴晶比例大幅增加,晶粒明显缩小。建立了考虑集肤效应的三维电磁场瞬态有限元模型,利用ANSYS软件对电极及熔体内的电场、磁场、电磁力分布进行了计算,结果表明,由于集肤效应使得电磁场主要集中在电极周围和熔体上部,且在脉宽的后期电磁场的方向由于涡流的存在而发生变化;电极间距对熔体电磁场均匀性具有较大影响;随着脉冲电流的脉宽减小,熔体上部的电磁场增强,但集肤深度也越小,同时作用时间缩短。 相似文献