Alternative methods for producing wind tunnel models for student projects in fluid mechanics

Abstract

Project-based approaches to engineering education make it desirable for students to create functional wind tunnel models for testing of original designs in fluid mechanics courses. This paper compares several rapid-prototyping (RP) methods with conventional mold/cast techniques for fabrication of fluid-dynamic models on the basis of cost, production time, ease-of-use, and accessibility of equipment and materials. RP technologies considered include stereolithography (SLA), selective laser sintering (SLS), fused-deposition modeling (FDM), 3-D printing, and CNC machining. These approaches start from an original design in digital format, while conventional methods, such as casting with silicone-rubber or alginate molds require at least a rough physical prototype. Coating and finishing processes for RP models are also discussed. © American Society for Engineering Education, 2007.