초록 ▼

An improved fluid driven turbine blade system is provided, which is self-governing at relatively high fluid velocities. This is achieved by a combination of two sets of turbine blades, one having a positive efficiency, and the other having a negative efficiency at the fluid velocity at which the sel

An improved fluid driven turbine blade system is provided, which is self-governing at relatively high fluid velocities. This is achieved by a combination of two sets of turbine blades, one having a positive efficiency, and the other having a negative efficiency at the fluid velocity at which the self-governing effect occurs. Also provided is a variable friction drive apparatus for powering an energy conversion device. The combination of the improved turbine blade system and the variable friction drive comprises a windmill for driving an electric generator, the windmill having a low required start-up torque at low wind speeds and being self-governing so as not to overspeed the generator at high speeds.

대표청구항 ▼

A fluid driven turbine blade system which is self-governing at a given fluid velocity, comprising: a first blade means having a positive lift coefficient at the given fluid velocity, so that it then extracts energy from the fluid and adds kinetic energy to the turbine blade system; and a second fixe

A fluid driven turbine blade system which is self-governing at a given fluid velocity, comprising: a first blade means having a positive lift coefficient at the given fluid velocity, so that it then extracts energy from the fluid and adds kinetic energy to the turbine blade system; and a second fixed pitch blade means having a negative lift coefficient at the given fluid velocity, so that it extracts an amount of kinetic energy from the turbine blade system approximately equal to the amount of kinetic energy further added by the first blade means upon any increase in fluid velocity above said given fluid velocity, so that said turbine blade system is self-governing at said given fluid velocity.