A Study of Aerodynamic Variables on Ducted and Non-Ducted Propulsion Fans

Overview

Objectives/Goals My primary objective was to determine if ducted or non-ducted propulsion fans of the same size and propeller velocity would create more thrust and whether various inlet configurations could improve their performance. Methods/Materials Ducted and non - ducted propulsion fans with various inlet configurations were mounted atop scales. Measurements were taken before and after applying power. The difference was recorded as net thrust. Air velocities were measured at intake and exhaust to determine thrust in Newton's (theoretically, by means of the thrust formula). Material used: Four fan motors (6.3cm dia.), Three kitchen scales, Transmitter/Reciever, Motor speed control, 12 volt power supply, Various inlet rings. Results I found that impellers are more efficient in generating thrust than propellers, and that different inlet configurations can significantly improve thrust generation on a propeller design. Conclusions/Discussion Greater thrust generation in an enclosed duct can be explained by reduction of "propeller tip vortices". I was surprised to find that increasing thrust in my static tests was easily achievable by manipulation of inlet designs with principles I learned in my wind tunnel.

Competition history

• CSEF 2017 Aerodynamics/ Hydrodynamics (Junior Division Only) · Entry J0109

Resources

• CSEF project summary ↗

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