This joint MINDEF-RSAF-USAFA project is to determine the clearance distance of which goods may be ejected from the cargo bay with as little disturbance from the vortices generated at the mouth of the bay (Figs.). This includes measuring the sizes and magnitudes of the larger vortex bubbles evolved. This CFD project serves as a springboard by which new ideas pertaining to airdrop efficiency and accuracy to the drop zone could be further implemented.
The pressure contours plots above show that the pressure of the incoming flow into canopy is no longer uniform due to the wake region of load at the bottom. This minute pressure difference between the inner and outer surface is due to the fact that the pressure near the outer surface of canopy is no longer close to that of free stream. The values of Cd for canopy with load are less than those of canopy without load. The detail information to these ideas however will not be disclosed here as they are classified with confidentiality.
- S Pang, EYK Ng, WS Chiu, “Comparison of Turbulence Models in Near Wake of Transport Plane C-130H Fuselage”, AIAA Journal of Aircraft, Vol. 50, No. 3 (2013), pp. 847-852. DOI: 10.2514/1.C032031.
- EYK Ng, S Pang, WS Chiu, “Computational Aerodynamics of the C-130 Predicting Airflow Effect on Airdrop”, International Journal of Computational Methods, Vol. 10, No. 5, World Scientific, (2013), pp. 1350025-1350033, DOI: 10.1142/S0219876213500254.