This is a matlab problem. where: c is the chord length, x is the position along

Question

This is a matlab problem.

where:
c is the chord length,
x is the position along the chord from 0 to c,
t is the maximum thickness as a fraction of the chord length (tc = maximum thickness).
Symmetrical four-digit NACA airfoils are designated NACA 00xx, where xx is 100t (i.e., NACA 0015
has t = 0.15).
Write a MatLab program for a symmetric four-digit NACA 00xx airfoil that:
1. Asks the user to enter the chord length in m,

2. Asks user to enter two last digits of the four-digit NACA code,

3. Graph the shape of a symmetric NACA 00xx airfoil.

Test your program for a NACA 0020 airfoil with a chord length of 1.5 m.

Explanation / Answer

% NACA 6414%

clc

clear

format compact

m1=input('Please enter one digit number for maxi camber line:')

p1=input('Please enter one digit number for distance of m and chordline:')

t1=input('Please enter two digit number for thickness of airfoil:')

m=m1*0.01;

p=p1*0.1;

t=t1*0.01;

x1=[0:0.01:p];

x2=[p:0.01:1];

x=[x1,x2]

yc1=(m*(2*p*x1-x1.^2))/(p^2);

yc2=(m/(1-p)^2)*((1-2*p)+2*p*x2-x2.^2);

yt=(t/0.2)*(0.2969*sqrt(x)-0.1260*x-0.3516*x.^2+0.2843*x.^3-0.1015*x.^4)

yc=[yc1,yc2]

ang1=(atan((m/p^2)*(2*p-2*x1)))*180/pi

ang2=(atan((m/(1-p)^2)*(2*p-2*x2)))*180/pi

ang=[ang1,ang2]

xu=x-yt.*sin(ang)

yu=yc+yt.*cos(ang)

xl=x+yt.*sin(ang)

yl=yc-yt.*cos(ang)

xplot=[xu,xl]

yplot=[yu,yl]

plot(xplot,yplot)

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