Aeronautical and Automotive Systems
Assignment One Lab Sheet:How do Wings Work?
Tasks(use diagrams and equations to support your answers)
- Explain how an aerofoil generates lift.
- Describe three common misconceptions about lift.
(There are examples described within the website links provided in the Appendix)
- Why is an aerofoil shaped as it is?
- Why is it rounded and not pointed at the front
- why is it thicker in the middle
- Why is it tapered at the rear
- Why is it flatter underneath, with a camber making it curve on top?
- What other shapes will generate lift?
- Could a house brick?
- Could a football?
- Define the main types of aerodynamic drag.
- Define laminar and turbulent boundary layers.
- What are wingtip vortices and what causes them?
- Define the common formulas for Lift& Drag and give example use of the equations.
- IMPORTANT: To do this part you need to use a computer with XFLR5software installed. If you want to install a copy of XFLR5 on your own computer, or on a USB memory stick, you can do so from here: http://www.xflr5.com/xflr5.htm
For guidance on how to use this software, see the XFLR5 user guide slides on student central, or, see Youtube tutorial videos –> click here
Using the XFLR5 software package generate plots of CL and CD versus angle for a commonly used NACA 4 series aerofoil of your choice. You need to plot two graphs;
- CL versus Alpha
- CD versus Alpha
- From the plots in section question 9;
- What angle gives zero lift?
- What angle gives maximum lift?
- If it flies upside down, what is the maximum lift, and at what angle?
- Include a drawing of the aerofoil you have chosen in section nine.
Please visit the following websites to aid your learning of aerofoil aerodynamics:
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