Air starters can be for vane motors or turbine motors. Vane air starters work on the principle of positive displacement, while turbine air starters consist of a radial inward flow or axial flow turbine. The compressed air for air starters can be provided by bleed air from a running engine, auxiliary power unit (APU), or a portable gas generator. When a limited volume of starting air is required for a short crank cycle, vane starters are used. 更多
