http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
노성준(S.J. Noh),김규홍(K.H. Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
This paper is about a numerical analysis of ablation at the surface of tungsten in high temperature flow. Tungsten has the highest melting point among metals, and its hardness and strength properties are outstanding when temperature is high above 2000K. For this reason, tungsten have been used widely in high temperature industries. However when it oxidized, tungsten lost its hardness and thermal resistance, and ablation phenomena occurs. To prevent these oxidation and ablation phenomena, we should know about chemical reaction speed of oxidation and probability function about how fast reaction occurs and what species would be produced by oxidation phenomena. In this study, we assumed reaction probability function and made a surface ablation model of tungsten in high temperature. And we performed numerical analysis about surface ablation along time with 2-D axisymmetric cylinder shape. And we compared numerical results with experimental results, and figured out the probability function around 3000K.
전산해석을 이용한 실리카-페놀 열방어구조물의 용융을 포함한 삭마 현상 예측
김평기(P. K. Kim),노성준(S. J. Noh),김규홍(K. H. Kim),박경민 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.5
Ablation model for silica-phenolic Thermal Protection System(TPS) was developed in this study. Also, computational analysis for such TPS was conducted using the developed model. In order to analyze ablation phenomenon inside the solid, mass and energy balance equations were used as the governing equations. The total recession is modeled to be the sum of recession by reaction and melting. CFD analysis was conducted to predict the minimum radius of TPS for various flight Mach number which can protect the vehicle. This study can aid in preliminary designs of TPS since the minimum radius of TPS can be predicted.