Design and Optimization of Low speed wind tunnel Contraction Using CFD
Keywords:CFD; Numerical simulation; Low speed wind tunnel; Contraction design; Flow uniformity wind tunnel.
This paper describes the design and fabrication of a device measuring mass properties include mass, the center of gravity, and moment of inertias properties by integrating three operations into one equipment device for the object GRAD rocket. This paper focuses only on measuring mass and center of gravity in a single setup. The design is divided into three steps. The first step is to explain how to measure the mass and center of gravity. The second step is the design and fabrication considerations of the equipment device. In the third step, the data acquisition systems for load cell using PLC. Test results of fabricated devices on a calibrated bar are homogeneity, and its center of gravity is also known. The mass and center of gravity of the GRAD rocket are a measure for three samples. And the results were within the required tolerance with high accuracy compared to CAD software, and the results achieved a percentage error rate of less than 5% for both the mass and center of gravity.
G. E. Chmielewski, “Boundary Layer Considerations in the Design of
Aerodynamic Contractions,” McDonnell Douglas Research Laboratories,
St. Louis, Mo, VOL. 11, No.8, August 1974.
F. Fang, J. C. Chen, Experimental and Analytical Evaluation of Flow in
a Square-to-square Wind Tunnel Contraction, Journal of Wind Engineering
and Industrial Aerodynamics 89 - 247–262, 2001.
J. H. Bell, R. D. Mehta, Contraction Design for Small Low-Speed
Blind Tunnels, NASA Contraction Report 177488, August 1988.
Morel. T, Comprehensive Design of Axisymmetric Wind Tunnel
Contractions, ASME Journal of Fluids Engineering, 225-233, June 1975.
Jewel B. Barlow, Low speed wind tunnel testing 3rd ED. John Wiley
&Sons, Inc, 1999.
J.H. Bell and R.D, Boundary layer Predictions for small low speed
contractions, AIAA Journal, March 1989.