Aerodynamic measurements of the landing gear: Aerodynamics of the landing gear using different data acquisition techniques like Particle image velocimetry, Hot-film Anemometry, flow visualization

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.