摘要
利用ＳＯＬＡＶＯＦ方法，通过二维流场和三维温度场的耦合计算，对铝合金薄壁件反重力铸造进行了数值模拟研究。研究结果表明：铝合金薄壁件反重力铸造充填流体形态的基本特征是“反向充填”（适应３ｍｍ以上铸件）；充型结束时的温度场由充填流体形态决定；充型速度对充填流体形态的基本特征影响不大。
In aeronautical applications, thinwalled castings need more and more to be scientifically made. We are the first in China, if not in the world, to use personal computer to simulate antigravity mould filling and heat transfer of thinwalled castings in order to get clues for improving the quality of thin walled casting. In our PC simulation, we utilized SOLAVOF algorithm for fluid flow and a wellknown numerical heat transfer method given in Patankar′s book . We prepared Figs.3 through 6 to make our simulation findings easier to understand. In Fig.3, the mould filling speed was 0.2 m/s and fluid morphologies of aluminium alloy at three different times of 0.2 s, 0.4 s, and 2.8 s were shown respectively in (a), (b), and (c). In Fig4, the mould filling speed was 0.5 m/s and fluid morphologies of aluminium alloy at two different times of 0.2 s and 1.2 s were shown in (a) and (b). By comparing Fig,3 and 4, we conclude that no improvement in fluid morphology can be achieved by varying the speed of mould filling. Such a conclusion was also reached previously by the authors with hydraulic simulation; thus computer simulation and hydraulic simulation appear to support each other mutually. Fig.5 indicated that temperature field showed big differences and this could cause shrinkage defects in castings. Thus we should endeavor to reduce such temperature differences. Fig.6 showed gas trappings found by PC simulation for a mould filling speed of 0.5 m/s . Thus we should endeavor to so reduce the mould filling speed as to avoid the appearance of gas trapping.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
1997年第3期327-332,共6页
Journal of Northwestern Polytechnical University
关键词
数值模拟
薄壁铸件
反重力充型
充型
传热
铸造
numerical simulation, thinwalled casting, antigravity mould filling
