Aerodynamic measurements of the landing gear

Aerodynamic measurements were taken over models of§the Boeing 777 high fidelity isolated landing gear at§a free-stream Mach number of 0.16. Noise control§devices (NCD) were developed at Virginia Tech to§reduce noise by shielding gear components, reducing§wake interactions and by streamlining the flow around§certain landing gear components. Aerodynamic§measurements were performed to understand the flow§over the landing gear and also changes in the flow§between Baseline and NCD configurations (without§and with Noise Control Devices respectively).§Hot-film, Pitot-static measurements and flow§visualization using tufts were performed over an§isolated 26% scale-model high fidelity landing gear§for the Baseline and NCD configurations. Contours§of turbulence intensity, normalized wake velocity and§normalized total pressure loss for both§configurations are compared. The Baseline §configuration was also compared with the NASA Ames§study. Hot-film measurements are also compared to§Microphone Phased Array results which were acquired§at Virginia Tech. A novel technique for processing§hot-film measurements by breaking turbulence into§octave bands as acoustic measurements is presented.