Small Scale Sub-Sonic Wind Tunnel-Design Construction and Performance Test

Abstract

The purpose of this study is to design and fabricate asmall-scale wind tunnel to obtain the lift forces similar to the calibrated wind tunnel. The test section size is 29.5cmx29.5cmx70cm and velocity speed at 2.5m/s, 5m/s and 10m/s correspond to Reynolds number 25 000, 50 000 and 100 000. The mini weighing scale used to obtain lift forces through NACA 0018airfoil in the test section. The angle of attack varies from 00 to 200with increment of 50. The velocity meter was used to measure the velocity flow created by fan and compared with calibrated wind tunnel fan in Radius-Per-Minute (RPM) unit. The mean difference between Fan RPM for small scale wind tunnel and calibrated wind tunnel is almost 10%. The lift forces value alsoshows themean difference percentage is below 5% between small scale wind tunnel and calibrated wind tunnel.The result is very useful in future work to gain drag forces from this small-scale wind tunnel.