Thus the higher the velocity of the flow the lower the pressure Air flowing

# Thus the higher the velocity of the flow the lower

• 14
• 100% (1) 1 out of 1 people found this document helpful

This preview shows page 9 - 14 out of 14 pages.

Thus the higher the velocity of the flow, the lower the pressure. Air flowing over an airfoil will decrease in pressure. The pressure loss over the top surface is greater than that of the bottom surface. The result is a net pressure force in the upward direction. This pressure force is lift. Every physical body that is propelled through the air will experience resistance to the air flow. This resistance is called drag. Drag is the result of a number of physical conditions. Pressure drag is that which you feel when running on a windy day. The pressure of the wind in front of you is greater than the pressure of the wake behind you. A rough surface will induce more frictional drag than a smooth surface. To reduce viscous drag, aircraft manufacturers attempt to make contact surfaces as smooth as possible to reduce drag. Like lift, drag is proportional to dynamic pressure and the area on which it acts. The drag coefficient, analogous to the lift coefficient, is a measure of the amount of dynamic pressure gets converted into drag. Unlike the lift coefficient however, engineers usually design the drag coefficient to be as low as possible. Low drag coefficients are desirable because an aircraft's efficiency increases as drag decreases. 3 Experimental Apparatus and Procedures 8
4 Presentation of Results 9
5 Discussion of Results 10
6 Conclusions and Recommendations 11
7 Acknowledgements The authors would like to thank the RI Department of Education for providing the funds for conducting this experiment and for providing the necessary manuals on the equipment. 12
Bibliography 13

#### You've reached the end of your free preview.

Want to read all 14 pages?

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern