Technical report for Collegiate Wind Competition

A project submitted to the faculty of the California Maritime Academy in partial fulfillment of the requirements for the degree of Bachelors of Science in Mechanical Engineering.

Our turbine is a three bladed, horizontal axis, upwind, direct drive system. The aerodynamic design is based on the E 216 airfoil. The primary design and analysis tools used for creating the blades was done through QBlade. Relatively little information exists for airfoil performance at low Reynolds Numbers; XFoil analsys in QBlade will be the basis for predictions of aerodynamic performance. The Schmitz Optimization theory was used to produce the chord and twist schedules for the blades. Our turbine is able to return to the upwind direction when the base is rotated, while still producing positive power. Our results generally followed our theoretical trend predicted, however the actual power produced was significantly lower than predicted. Our theoretical model predicted about 50 Watts at 2000 RPM, whereas the turbine actually produced about 20 Watts at 2000 RPM through testing.