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Figure 1


Fig. 1. Measurement and calibration of wind speed in the flight tunnel. Wind speed was varied by changing the voltage supplied to the fan. Wind speeds at the five different voltages used in experiment 2 are shown. Wind speed was measured using both a fan anemometer and a hot wire anemometer at five positions along the tunnel. At each position wind speed was measured with the hot wire anemometer at nine points arranged in a 3x3 array across the cross section of the tunnel. Additionally the fan anemometer was used to record wind speed in the centre of the tunnel. The plotted points are the averages of these 10 values, and thus represent the average wind speed encountered at that position in the tunnel. A diagram of the tunnel is shown, scaled to match the x axis of the graph.





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