One of grad students designed a three-bladed horizontal axis wind turbine for th

Question

One of grad students designed a three-bladed horizontal axis wind turbine for the WSU Vancouver wind farm. He selected the MH102 airfoil shape based on its lift and drag behavior, shown below: At the test location, the typical wind speeds were measured at 3.1 m/s, and the expected rotation rate was 450 rpm. Based on these conditions, what radius would you suggest for this turbine? Assuming the design approaches the Betz limit, what is the chord at the tip? For similar conditions, what is the pitch angle at the tip?

Explanation / Answer

Assume turbine tip speed ratio to be del =5.0

N=450 rpm thus angular freq w=N*2pi/60=(450*2*3.14)/60=47.1000 rad/s

U=wind velocity=3.1 m/s

we know R=del*U/W==(5*3.1)/47.1=0.32 m or 32 cm radius or 64 cm diameter

b. Chord at tip is inversely proportional to  the coefficient of lift at the chosen design angle of attack, and function of tip speed ratio (1/de;^2) and its radius. see the equation of chord length.

c.Pitch angle the the tip depnds on the angle of attack, and tip speed ratio

(The tip-speed ratio is the ratio of the speed of the tip of a blade and the actual speed of the wind)

Related Questions

Navigate

• Browse (All)
• Browse O
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.