HW26solution

# HW26solution - Nov 22 2011 AAE 334 Fall 2011 Homework 26...

This preview shows pages 1–3. Sign up to view the full content.

Nov. 22, 2011 AAE 334 Fall 2011, Homework 26 Due Friday, November 18 at the beginning of class. Use the shock-expansion method to compute the lift and drag coefficients for the airfoil sketched below in a Mach 1.8 flow. Chord length is c and maximum thickness is at the quarter- chord point and equal to 8% of the chord. Angle of attack varies from 0 to 10 degrees. Use Matlab compressible flow files to save time. Hand in: 1. Written explanation of your method 2. Your m-file 3. Plot of the lift curve 4. Plot of the drag polar Geometry first: Label freestream as 1, lower surface 2, forward upper surface 3, and aft upper surface 4. Surface slopes are 0 2 dx dy , 32 . 0 25 . 0 08 . 0 3 dx dy , and 107 . 0 75 . 0 08 . 0 4 dx dy . Leading edge angle is 74 . 17 25 . 0 08 . 0 arctan LE . Similarly, trailing edge angle is 090 . 6 75 . 0 08 . 0 arctan TE . Thus the internal angle at the apex of the upper surface is 156.2 o . The turning angle then from 3 to 4 is 180 o -156.2 o = 23.8 o . Now find the pressures. 3 1 4 2 OS OS PM y x

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Nov. 22, 2011 Flow from 1 to 2 is no change for 0 and is a compression corner of turning angle for 0
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### 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