A Feasibility Study on Drag Reduction of a Cone at Low Speeds.
Final rept. Dec 70-Mar 71,
EDGEWOOD ARSENAL ABERDEEN PROVING GROUND MD
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A 10-inch cone with a 4-inch-diameter base was utilized in this feasibility study to determine the possibility of overall drag reduction by introducing a jet of gas near the nose of the cone to change the boundary layer characteristics favorably therby minimizing friction drag. Initial tests were made at selected velocities with a smooth-finished wooden model to determine baseline drag values, followed by an instrumented aluminum model with an annular slot located 25 percent of the body length from the nose. Gas was injected into the boundary layer through the annular slot and the results indicated that a thrust was developed by the emitted gas accounting for the drag reduction. Author
- Fluid Mechanics