本文選題：混沌對(duì)流　切入點(diǎn)：Kolmogorov熵　出處：《機(jī)械工程學(xué)報(bào)》2016年16期

【摘要】：研究不同半固態(tài)稀土鋁合金熔體混沌對(duì)流的表征及在不同電磁攪拌頻率和時(shí)間下誘發(fā)的混沌對(duì)流對(duì)加入相同量La及Yb的半固態(tài)A356鋁合金初生相形貌演化的影響。用Fluent流體力學(xué)軟件模擬電磁場作用下A356鋁熔液中微粒的流動(dòng)軌跡,計(jì)算流動(dòng)軌跡的混沌特征量Kolmogorov熵,發(fā)現(xiàn)只要適當(dāng)施加電磁場,Kolmogorov熵值隨電磁攪拌頻率及時(shí)間的增大而增加。結(jié)合試驗(yàn),添加兩種等量不同稀土對(duì)A356鋁合金初生相形貌影響,并施加不同攪拌頻率及時(shí)間的試驗(yàn)參數(shù)后,兩者都在攪拌頻率30 Hz、攪拌時(shí)間15 s時(shí),初生相形貌最理想,晶粒細(xì)小圓整且Kolmogorov熵值達(dá)到最大。但A356-Yb鋁合金的初生相形貌優(yōu)于A356-La鋁合金初生相形貌。通過模擬和試驗(yàn),混沌看似無規(guī)則但其中暗含著規(guī)律,加入的稀土和施加的磁場頻率及時(shí)間都互相影響混沌對(duì)流下的合金初生相形貌。
[Abstract]:The characterization of chaotic convection in different semisolid rare earth aluminum alloy melts and the effect of chaotic convection induced by different electromagnetic stirring frequency and time on the morphology evolution of semi-solid A356 aluminum alloy with the same amounts of La and Yb were studied.The Fluent fluid dynamics software is used to simulate the flow path of particles in A356 aluminum melt under the action of electromagnetic field. The chaotic characteristic quantity Kolmogorov entropy of the flow path is calculated. It is found that the value of Kolmogorov entropy increases with the increase of the frequency and time of electromagnetic stirring if the electromagnetic field is properly applied.Combined with the experiment, the morphology of primary phase of A356 aluminum alloy was affected by adding two kinds of different rare earth elements, and the primary phase morphology of A356 aluminum alloy was optimized when the stirring frequency and time were 30 Hz and 15 s, respectively.The grain size is fine and round and the Kolmogorov entropy is maximum.But the primary phase morphology of A356-Yb aluminum alloy is better than that of A356-La aluminum alloy.Through simulation and experiments, chaos appears to be irregular, but there is a law in it. The frequency and time of adding rare earth and applied magnetic field affect the morphology of the primary phase of the alloy under flow.
【作者單位】： 江西理工大學(xué)機(jī)電工程學(xué)院;江西理工大學(xué)材料科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金(51144009,51361012) 江西省自然科學(xué)基金(20114bab206014,20142bab206012) 江西省教育廳科技落地計(jì)劃(KJLD12070);江西省教育廳科技(GJJ2014407)資助項(xiàng)目
【分類號(hào)】：TG292

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