| Autor: |
Maeda, Y., Nomura, H., Otsuka, Y., Tomishige, H., Mori, Y. |
| Zdroj: |
International Journal of Cast Metals Research; March 2003, Vol. 15 Issue: 4 p441-444, 4p |
| Abstrakt: |
This paper provides the numerical simulation model of the gas flow through the sand core. When the sand core is used in the casting, the core is heated to release gas which causes casting defect. It is necessary to exhaust the gas in order to obtain a sound casting product without defects caused by gas entrapped. As a technique to decide the locations of gas vents, knowing the distribution of pressure and velocity in the core by numerical simulation is one of the key methods to give sound castings. In this study, Ergun's equation is used as the fundamental equation considering the variation of characteristics of the sand core. The governing equations for the gas are solved by the SIMPLE method. The experiments are done to verify the model. As the result of tuning up parameters by comparing the result of simulation with the experiment, it becomes possible to estimate pressure distribution, velocity, and flow quantity with enough precision. From these results, the present simulation provides the useful information for deciding the positions of gas vents. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
