A turbine is a rotary engine that extracts energy from a fluid flow and converts it into useful work.
The simplest turbines have one moving part, a rotor assembly, which is a shaft or drum with blades attached. Moving fluid acts on the blades, or the blades react to the flow, so that they move and impart rotational energy to the rotor. Early turbine examples are windmills and water wheels.
The latest U.S.
census estimates indicate that there are more than 16,000 companies operating
in the NAICS codes identified for wind turbine components and these companies employ more than 1 million employees, with an annual payroll of more than $35 billion. But with the U.S. still in recession recovery mode, these businesses are rapidly finding ways to cut costs and streamline payroll. Meanwhile, the shortage of wind turbines supply domestically is leading to an accelerating demand for new production.