航空通用空气动力学英文课件.ppt

* Fowler Flaps Fowler flaps move rearward and downward. This increases both the camber and chord length of the wing thus increasing lift. * Slotted Flaps Slots in a set of flaps allow the high pressure air from under the wing to move to the upper area of the flaps thus energizing the air stream and delaying airflow separation. * Slats and Slots “Leading Edge Flaps” Changes the size and shape of the wing just like flaps. Increase lift by increasing camber and chord length. * * Wing Altering Devices The primary purpose of high lift devices is to increase the: L/Dmax Lift at low speeds Drag and reduce airspeed * Wing Altering Devices The primary purpose of high lift devices is to increase the: Lift at low speeds * Spoilers Spoilers extend from the top of the wing and both reduce lift and increase drag. Spoilers can also be used to aid turns. * Yaw Dampers Yaw Dampers are required equipment on most turbine powered aircraft. It is a component of the autopilot system that makes small rudder movements to correct for dutch roll problems. * * * * * * Add illustration * picture * picture * Find examples and a picture * Insert shockwave illustration * Find out how much stall increases with altitude * Get a operating envelope chart * picture * * * * Shock Waves The air behind a shock wave has the following characteristics: Cooler than in front of the shock wave Low pressure Low density * TAT and SAT TAT=Total Air Temperature. Shows the temperature as read by the temperature probe. This temperature will be higher than static air temperature due to compressibility. SAT=Static Air Temperature. TAT corrected for compressibility. Outside Air Temperature. PACK 1 PACK 2 840 * Mach Tuck In subsonic flight the center of pressure of the wing lies at 25% MAC In transonic and supersonic flight the center of pressure moves to 50% MAC This is caused by airflow separation behind the shock wave. When transitioning into transonic flight the airplane will pitch down. As airspeed incr