# A Practice of Developing New Environment-friendly System by Composites

• Kim, Yun-Hae (Department of Materials Engineering, Korea Maritime University) ;
• Yang, Dong-Hun (Department of Materials Engineering, Korea Maritime University) ;
• Jo, Young-Dae (Department of Materials Engineering, Korea Maritime University) ;
• An, Seung-Jun (Department of Materials Engineering, Korea Maritime University) ;
• Park, Se-Ho (Department of Materials Engineering, Korea Maritime University) ;
• Yoon, Sung-Won (Department of Materials Engineering, Korea Maritime University)
• Accepted : 2010.11.05
• Published : 2010.11.30

#### Abstract

This study intends to study about the blade performance loss occurred due to the variation in the shape of an airfoil from attachment/non-attachment of an erosion shield for the hovercraft. The model in this study has used NACA44XXseries, has designed NACA44XX-series by using the Auto CAD, and it designed the shape that has attached an erosion shield to this model according to the thickness and length. By using these models, a grid was generated by GAMBIT and the lift coefficient ($C_l$) and the drag coefficient ($C_d$) were calculated FLUENT code for flow analysis. Through this, the $C_l$ and $C_d$ have calculated and compared the lift-to-drag ratio that an indicator of airfoil performance according to the shape and attachment/non-attachment of erosion shield.

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