Hypersonic Planetary Entry Flight Mechanics by Nguyen X Vinh

By Nguyen X Vinh

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5% full scale. However, the pressure system was calibrated. Each sensor features its own brazing plate with its own power supply and amplifier resulting in a compact design. The pressure measurement system is able to resolve fluctuating pressure up to several Hz without any amplitude distortion. The required reference static pressure for the differential pressure sensors was taken from the Pitot tube above the model, located at the wind tunnel ceiling. The sampling rate was set to 4096Hz. 2 106 (Re based on vehicle length).

Also recall the plot for pressure signals on the front and rear of the vehicle in figure 4 earlier. This result has also been found by Howell et al. [12] for a scale wind tunnel test when a small car is overtaking a truck with the highest drag increase experienced when the car is about half a length forward of the truck. The change in yawing rate is plotted in figure 9. 5 can be noticed for both cases. Figure 8. Longitudinal acceleration during overtaking for two different vehicle distances. Figure 9.

To record the vehicles motion, a Tokyo Keike motion and GPS sensor was used. An optical distance sensor measured the relative position between the two test vehicles and was mounted on the front wheel fender area on the vehicle. It also served as reference point for the data analysis. A schematic of the location of the pressure transducers, distance sensor and camera guidance system as installed on the car is shown in figure 2. Figure 2. Illustration of the test vehicle and experimental setup. 6 km) and low crosswind conditions all year long.

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