(大連理工大學(xué) 三束材料改性國(guó)家重點(diǎn)實(shí)驗(yàn)室材料科學(xué)與工程學(xué)院，大連 116023)
摘 要: 對(duì)自行研制的電磁攪拌器中金屬液的電磁場(chǎng)和流場(chǎng)進(jìn)行數(shù)值模擬，并進(jìn)行實(shí)驗(yàn)驗(yàn)證。結(jié)果表明：在旋轉(zhuǎn)磁場(chǎng)攪拌器作用下，金屬液中除存在橫截面上的旋轉(zhuǎn)離心流動(dòng)外，還存在著縱向的大環(huán)流，但二者速度不同，前者比后者高出一個(gè)數(shù)量級(jí)；金屬液表面的磁感應(yīng)強(qiáng)度B0與電流頻率成反比，與輸入的電壓成正比；金屬液所受電磁力的最大值與磁感應(yīng)強(qiáng)度B0的平方成正比，與頻率的n次方成反比，其中1/2≤n≤3/2；n與金屬液的電阻率有關(guān)，電阻率越小則n越小；對(duì)于純鋁n為1/2，對(duì)于純錫和純鉛n為1；金屬液的轉(zhuǎn)速與磁感應(yīng)強(qiáng)度B0成正比，與金屬液密度的平方根成反比。
關(guān)鍵字: 金屬液；旋轉(zhuǎn)電磁場(chǎng)；流動(dòng)；數(shù)值模擬
magnetic field
（State Key Laboratory of Materials Modification by Laser,Ion and Electron Beams, School of Materials Science and Engineering,Dalian University of Technology, Dalian 116023, China）
Abstract:The couple field of electromagnetic force and flow was simulated for the self-developed rotating electromagnetic stirring equipment. The results show that under the stirring electromagnetic field, not only rotating flow exists in the cross section but also circulation flow exists in the vertical section of molten metal. The velocity of circulation flow is one order lesser than that of the rotating flow. The magnetic flux density of liquid metal surface (B0) is in inverse proportion to the current frequency whereas is in direct proportion to the input volt/current. The maximum electromagnetic force is in direct proportion to the square of magnetic flux density (B0) whereas is in inverse proportion to the nth-power of current frequency. n is relative to the electric resistance of molten metal and varies from 1/2 to 3/2, which is 1/2 for aluminum metal and 1 for tin metal and lead metal. The rotating velocity of molten metal is in direct proportion to the magnetic flux density (B0) and is in inverse proportion to the square root of the density of molten metal.
Key words: molten metal; rotating magnetic field; flow field; mathematical simulation
