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Blade tip sealing has been a challenging problem since the development of the gas turbine engine. It is such because the clearance between the blade tips and surrounding casing (shroud) tends to vary due primarily to changes in thermal and mechanical loads on the rotating (turbine wheel) and stationary (stator, turbine casing) structures.
Steam turbines and gas turbines, on the other hand, when new and/or in good repair, do not, by themselves generate excessive vibration as long as the turbine blades are in a perfect condition and rotate in a smooth gas flow. But after some time microscopic defects appear and cause small pits to appear in the surface of the intake and the blades ...
The engine weighs approximately 2,500 lb (1,100 kg) and occupies a volume of 40 cu ft (1.1 m 3), measuring 63 in × 40 in × 28 in (1,600 mm × 1,020 mm × 710 mm). [4] The engine can use a variety of fuels, including jet fuel, gasoline, diesel and marine diesel. [2] The engine is a three-shaft machine composed of five sub-modules: [4]
The LM1500 was derived from the J79 engine in 1960. [3] Its first application was for the first US sea-going research hydrofoil, HS Denison. [1] Conversion as a marinised turboshaft engine involved two major changes: the addition of a free power turbine, and corrosion-protection by the addition of internal coatings and a maintenance scheme of freshwater rinsing to prevent salt damage.
The bickering over a turbine Moscow says is to blame for a reduction of gas flows via Nord Stream 1 has put into focus the equipment the pipeline needs to operate. At the heart of the tussle lies ...
Thermal barrier coating (colored white) on a turbine guide vane in a V2500 turbofan engine. Thermal barrier coatings (TBCs) are advanced materials systems usually applied to metallic surfaces on parts operating at elevated temperatures, such as gas turbine combustors and turbines, and in automotive exhaust heat management.
The twin-shaft, twin-fan engine with FADEC has a service ceiling of 18,300 m (60,000 ft). It lacks an afterburner, and has a combustor with advanced coatings and uses additive manufacturing technologies. [2] The 18,000 lbf (80 kN) GE Affinity has a nine-stage HP compressor, a single-stage HP turbine and a two-stage low-pressure turbine.
Robins are a much loved Christmas icon, but wind turbines installed in their habitat are affecting their song, with worrying consequences. Robin hushed: wind turbines are making songbirds change ...