【Experiment Contents】 L Wind tunnel experiment a)Test and verify continuity equation Install a glass cover behind wind machine,serving as a wind tunnel.Put rail on it,and an oblique base beneath.Use pressure sensor head associated with precise pressure meter,to measure dynamic pressure Ap and wind speed vo at each marked spot.Students need to further calculate the flow at each marked spot based on the measurement,testing and verifying continuity equation. b)Test the wing model Mount the wing model under cart inside wind tunnel.It will be necessary to install airproof rail on wind path.In the mean time,insert angle staff(See Fig 6),and use fan-shaped ergometer and lift balance sensor 1.During measurement,change the wing angle from +12to 8.With every 2,students shall measure the resistent force Fw and elevating force Fa.Before starting measuring,students shall set wing angle to +12,and then adjust the wind speed to make the resistent force to be around 2N.Draw the plot of Fw verse Fa according to data measured,and estimate the optimal angle for plane taking off. II.Open-tunnel experiment. A)Put wing model right behind wind generator,with sensor head symmetrically located on the side and connected to pressure meter.Change the wing angle(every 10 get a measurement), measure the pressure difference between wing upper and lower region. B)Relocate sensor head and do above step once more. C)Plot the relationship between wing angle and pressure difference.Based on that estimate the optimal angle for plane to take off.Illustrate your reason. 【Attentions.】 I.Some parts are very thin and fragile.Be cautious about the way you put force when installing and uninstalling cart and ergometer. II.There should be some space between suction port of wind generator and wind tunnel inlet. DONOT let wind machine(generator)keep working for more than 3 minutes. III.The liquid inside precise pressure meter is very special and dedicated to that type of meter. Please be careful to not spill it out when installing.Also please cover the rim of tube when not using. IV.Make sure not to overload the fan-shaped ergometer and lift balance. 1717 【Experiment Contents】 I. Wind tunnel experiment a) Test and verify continuity equation Install a glass cover behind wind machine, serving as a wind tunnel. Put rail on it, and an oblique base beneath. Use pressure sensor head associated with precise pressure meter, to measure dynamic pressure p and wind speed v0 at each marked spot. Students need to further calculate the flow at each marked spot based on the measurement, testing and verifying continuity equation. b) Test the wing model Mount the wing model under cart inside wind tunnel. It will be necessary to install airproof rail on wind path. In the mean time, insert angle staff(See Fig 6), and use fan-shaped ergometer and lift balance sensor 1. During measurement, change the wing angle from +12°to 8°. With every 2°, students shall measure the resistent force FW and elevating force Fa. Before starting measuring, students shall set wing angle to +12°, and then adjust the wind speed to make the resistent force to be around 2N. Draw the plot of FW verse Fa according to data measured, and estimate the optimal angle for plane taking off. II. Open-tunnel experiment. A) Put wing model right behind wind generator, with sensor head symmetrically located on the side and connected to pressure meter. Change the wing angle(every 10° get a measurement), measure the pressure difference between wing upper and lower region. B) Relocate sensor head and do above step once more. C) Plot the relationship between wing angle and pressure difference. Based on that estimate the optimal angle for plane to take off. Illustrate your reason. 【Attentions】 I. Some parts are very thin and fragile. Be cautious about the way you put force when installing and uninstalling cart and ergometer. II. There should be some space between suction port of wind generator and wind tunnel inlet. DONOT let wind machine(generator) keep working for more than 3 minutes. III. The liquid inside precise pressure meter is very special and dedicated to that type of meter. Please be careful to not spill it out when installing. Also please cover the rim of tube when not using. IV. Make sure not to overload the fan-shaped ergometer and lift balance