对消失模铸造铸铁件流动前沿的气隙进行了研究，探讨了气隙与坍塌缺陷的相互关系。
In this paper the gas gap in the expendable pattern casting process was studied and the relation between the gas gap and collapse defect is discussed.
文摘：对消失模铸造铸铁件流动前沿的气隙进行了研究，探讨了气隙与坍塌缺陷的相互关系。
Abstract: in this paper the gas gap in the expendable pattern casting process was studied and the relation between the gas gap and collapse defect is discussed.
前言：在铸造模拟中，目前流动前沿的难题处理上，用得较多的有两种方法：V OF法和守恒标量法。
There is two methods used most in the casting process simulation to determine the flowing front at present: the VOF method and the conservation scalar quantity method.
以带圆孔的长方形为例，模拟比较了不同网格密度和注入口位置对充模时间、流动前沿以及干点形成区域的影响。
Flow front, filling time and dry spot were simulated and analyzed through comparing different mesh density and injection location such as the shape of the rectangle with hole.
试验结果表明，铸铁件流动前沿不仅存在明显的气隙，而且采用聚苯乙烯模样材料，负压下浇注时，其气隙压力低于1个大气压。
The results indicated that there exists obvious gas gap in molten iron flowing front, and the pressure in gas gap with EPS pattern during vacuum pouring is less than 1 a tm.
针对半固态成形，特别是触变锻造成形中浆料流动前沿开裂等质量问题，首次提出了流动前沿等体积流量的概念，并将其运用到半固态成形模具优化设计中。
With an aim to solve the long-term existing problem of the cracks in flow-front during thixo-forging, a new theory of constant volume flux of slurry was put forward in optimizing die design.
到2010年7月，它的流动速度已加速到每年大约15公里，冰川前沿已消退将近10公里(6英里)。
By July 2010, it had accelerated to roughly 15 kilometers per year, and the leading edge had retreated nearly 10 kilometers (6 miles).
在具有粒子注入和回收系统的垂直激波管中，测量了气固两相流动激波前沿后松驰区的压力。
The pressures in the relaxation zone behind a shock front for gas-particle flow were measured in the vertical shock tube with a system of injecting and collecting particles.
讨论了塑料注射成型流动过程分析中熔体前沿喷泉效应的近似处理方法和数值分析方法。
The methods of approximate treat and numeric analysis for melt front fountain effect in the flow analysis of plastic injection molding was discussed in this paper.
服务外包是当前学的前沿话题，是国际资本流动研究的新领域。
Service Outsourcing, a latest topic in economics, has become a new field in the research of international capital flow.
采用实物期权理论对公司流动性进行定价，是目前公司金融理论的前沿课题。
Pricing liquidity in the real option theory is a frontier in present corporate financial theory.
多孔介质中的流动与传热涉及许多工程应用，已经成为当前工程热物理学科最为活跃的前沿研究领域之一。
Flow and heat transfer in porous, which is one of the most interested issues in the engineering thermo-physics, is frequently encountered in many fields of science and engineering.
多孔介质中的流动与传热涉及许多工程应用，已经成为当前工程热物理学科最为活跃的前沿研究领域之一。
Flow and heat transfer in porous, which is one of the most interested issues in the engineering thermo-physics, is frequently encountered in many fields of science and engineering.
应用推荐