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Fast burning characteristics of hydrogen have permitted high speed engine operation.
In developing new models, high speed engine designers have pursued essentially the same goals as their counterparts in the low and medium speed sectors.
High speed engine designs have also benefited from several technological innovations such as modular assembly, electronically controlled fuel injection systems, common rail fuel systems, and sophisticated electronic control/ monitoring systems.
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Recently, to have stable motion in high speed engines, the rigidity of the valve system has been increased, so that the previous model cannot be applied to the engines.
The presented results can also be interpreted as representative for the overall very high speed engines category (including MotoGP and F1 ones), being the air-breathing system layout mostly independent of engine technological level within this category.
Heavy duty high speed engines, in many cases, were originally designed for off-road vehicles and machines but have also found niches in stationary power generation and locomotive traction fields.
The deceleration of a supersonic flow to the subsonic regime inside a high-speed engine occurs through a series of shock waves, known as a shock train.
The acquisition of Germany-based designer MaK, formerly a member of the Krupp group, by Caterpillar in 1997 as MaK Motoren has boosted the valuable medium speed portfolio of the US-based high-speed engine specialist.
The German designer and enginebuilder MaK, formerly a member of the Krupp group, came under the umbrella of Caterpillar Inc. in 1997 as MaK Motoren, adding a valuable medium-speed portfolio to the US-based high-speed engine specialist's program.
In 1945 a bore of 400 mm-plus and a speed of around 400 rev/min were necessary; in 1970 typical medium-speed engine parameters resulted in a bore of 300 mm and a speed of 600 rev/min, while typical high-speed engine parameters were 250 mm and 1000 rev/min to yield 200 kW/cylinder.
It has since come to be used for such industrial applications as driving air compressors, where small, light-weight, high-speed engines with mechanical simplicity are needed.
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