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Aerofoil Measurement

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Submitted By jughanze
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The objectives of this experiment are to investigate the way in which the static pressure varies on the surface of an aerofoil in low speed flow, and to deduce the lift force acting on the aerofoil. An aerofoil with a symmetrical section is used for the experiment, which is conducted in a wind tunnel at a wind speed low enough for the flow to be treated as incompressible. From the measured distribution of surface pressure around the aerofoil at a small angle of incidence, the lift will be calculated by numerical integration, and compared with the predictions of inviscid flow theory. The measured chordwise load distribution will also be compared with the results given for inviscid flow by thin aerofoil theory. In addition, the stalling behaviour of the aerofoil will be demonstrated.
Apparatus
The model to be tested is an unswept, constant chord wing with a uniform cross-section. It is mounted vertically from floor to ceiling on a turntable in the working-section of a low-speed windtunnel, so that its angle of incidence ,α , (in the horizontal plane) to the undisturbed flow can be varied. The model has 30 small pressure tappings (holes) in its surface, connected to spanwise tubes built into the model. These tubes are taken out through the bottom of the model, and connected via plastic tubing to an inclined, multi-tube manometer containing alcohol.
The shape of the wing section is given in Fig. 1, and the chordwise positions of the surface pressure tappings are listed in Table 1. Note that the manometer tubes are connected alternately to tappings on the lower surface (even numbers) and upper surface (odd numbers) of the model, with tappings 1 and 30 being at the leading-edge and trailing-edge, respectively. The upper and lower surface pressure distributions are therefore superimposed on each other on the manometer for display purposes, but must be sorted into separate upper and lower surface groups for graph plotting.
The wind-tunnel is of the open return type, and has a working section with dimensions 1.0 m wide,
0.77 m high and 2.3 m long. It has a contraction ratio of 5.6, and the maximum speed in the working section is about 34 m/s. A Betz projection manometer (which reads pressure differences in millimetres of water) is provided to measure the tunnel reference pressure difference, from which the tunnel speed is calculated.
Fig.1

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