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A variable speed may or may not have a gearbox, depending on the manufacturer's desires. Wind turbines without gearboxes are called direct-drive wind turbines. An advantage of a gearbox is that generators are typically designed to have the rotor rotating at a high speed within the stator. Direct drive wind turbines do not exhibit this feature.
The blades of a Darrieus turbine can be canted into a helix, e.g. three blades and a helical twist of 60 degrees. The original designer of the helical turbine is Ulrich Stampa (Germany patent DE2948060A1, 1979). A. Gorlov proposed a similar design in 1995 (Gorlov's water turbines). Since the wind pulls each blade around on both the windward and ...
Most other turboshafts in this power bracket have a centrifugal unit as a final compressor stage. As a result, the blades at the rear of the compressor are very small (less than 0.5in high) and extremely thin. compressor handling at part speed is facilitated by several rows of variable pitch stators at the front part of the unit.
The three-stage low-pressure turbine is contra-rotating. A FADEC integrated propulsion control system will govern both engine and propeller pitch as an entire system. [27] Twelve 3D-printed parts replace 855 parts: frames, combustor liners, sumps, exhaust case, bearing housings, stationary components in the flowpath, and heat exchangers.
Propulsive efficiency comparison for various gas turbine engine configurations. In the 1970s, Hamilton Standard described its propfan as "a small diameter, highly loaded multiple bladed variable pitch propulsor having swept blades with thin advanced airfoil sections, integrated with a nacelle contoured to retard the airflow through the blades thereby reducing compressibility losses and ...
The power coefficient, , expresses what fraction of the power in the wind is being extracted by the wind turbine. It is generally assumed to be a function of both tip-speed ratio and pitch angle. Below is a plot of the variation of the power coefficient with variations in the tip-speed ratio when the pitch is held constant:
The LMS100 PA produces approximately 100 MW at an efficiency of around 46% LHV in open cycle operation. It is currently the largest and most efficient aero-derivative gas turbine. It is able to produce full rated power in under 10 minutes. [citation needed] The LMS100 comprises a low-pressure compressor, an intercooler, a supercore and a power ...
Klimov TV3-117 turboshaft engine. The accessory drive is the large casting on the top. The accessory drive is a gearbox that forms part of a gas turbine engine. [1] Although not part of the engine's core, it drives the accessories – such as generators, pumps for fuel and lubrication oil, air compressors, hydraulic pumps and engine starters – that are otherwise essential for the operation ...
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