Search

A practical procedure for optimum design of aerodynamic shapes is demonstrated. The proposed procedure uses an optimization program based on the method of feasible directions coupled with an analysis program that uses a relaxation solution of the inviscid, transonic, small-disturbance equations. Results are presented for low-drag, nonlifting transonic airfoils. Extension of the method to lifting airfoils, other speed regimes, and to three dimensions if feasible.

A correlation of sonic boom pressure signatures recorded during reentry of the Apollo 15 command module with wind-tunnel signatures extrapolated to flight distances has been made for Mach numbers of 1.16 and 4.57. The flight pressure signatures were recorded by pressure sensors located onboard ships positioned near the ground track while the wind-tunnel signatures were measured during tests of a 0.016-scale model of the command module. The agreement between estimates based on wind-tunnel data and flight measurements was better at Mach 4.57 than at Mach 1.16.

Pressure signatures were measured at roll angles ranging from 0 to 180 deg for a .016-scale model of the Apollo Command Module spacecraft at 25 deg angle of attack. The test Mach numbers ranged from 1.50 to 10.02.

Technique of extrapolating measured near-field overpressure data to larger altitude applied to wind tunnel overpressure data

Extrapolation of measured overpressure data for predicting sonic boom characteristics of different aerodynamic configurations

Parameter effects on coalescence of nose and wing shocks in wing/body pressure signature for sonic boom reduction

Comparison of spherical and triangular boundary layer trips on flat plate at supersonic speed

Supersonic skin friction measurements in grit type boundary layer transition trips with zero heat transfer

Aircraft sonic boom characteristics predicted from near field data obtained in wind tunnel

Mach number and geometry effects on level of sonic boom overpressure and applicability of Whitham theory to calculation of sonic boom

Boundary layer trips for producing turbulence in hypersonic flow

Aerodynamic characteristics of leading-edge sweep wing-body combinations

Guidelines applicable to grit-type boundary layer transition trips near leading edges of wind tunnel models