中文摘要：

通过实验的方法测定了矩形电磁冒口内部各位置的局部加热效率,并探究了磁场作用深度、电源功率和测试点高度对加热效率的影响。实验结果表明钢液模拟物内部拐角处磁感应强度值最大,加热效率最高,其次为短边中心和长边中心,而钢液模拟物中心位置受到磁场作用深度的限制,加热效率最低;随着电源功率的增加,钢液模拟物内部加热效率也随之增加,但增幅效果却有所不同,电源功率由5 k W增至7.5 kW时,加热效率增幅最大,综合考虑加热效率和实验设备两方面因素,选择7.5 k W较为合理;随着测试位点的上移,电磁加热效率先升高后降低,距模拟物底部165 mm（钢液模拟物1/2高度）位置的加热效率最高,在钢液模拟物中心高度偏上或偏下位置加热效率均会有所降低,且距离中心高度越远加热效率越低。

英文摘要：

The local heating efficiency in the rectangular electromagnetic riser was measured through the experimental method, and the effect of magnetic field depth, the power supply and the test height on heating efficiency was explored. The results show that ： the magnetic induction at the corner of simulacrum of steel liquid is the highest, and heating efficiency is the highest, then the center of narrow side and broad side. Because the center of the steel liquid simulacrum is limited by the magnetic field action depth, the heating efficiency is the lowest.With the increase of power, the heating efficiency in the steel liquid simulacrum is also increased, but the increasing effect is not different. When the power increases from 5kW to 7.5kW, the heating efficiency increases substantially.Thus, considering heating efficiency and experimental device synthetically, the power 7.5kW is more reasonable. With test point moves from the bottom to the top, the heating efficiency increases at first and then decreases; when the test point is 165 mm from the bottom of steel liquid simulacrum （the center height）, the heating efficiency is the highest,No matter the location is up or below, the heating efficiency turns out to be decreased. And the farther the distance between the test point and the center position is, the lower the heating efficiency is.