Supercharging


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supercharging

[′sü·pər‚chärj·iŋ]
(mechanical engineering)
A method of introducing air for combustion into the cylinder of an internal combustion engine at a pressure in excess of that which can be obtained by natural aspiration.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Supercharging

 

an increase in the quantity of the fresh charge of a combustible mixture that is supplied to an internal-combustion engine by raising the intake pressure. Supercharging is usually used to increase power by 20–45 percent without increasing the weight and size of the engine, and also to compensate for loss of power under high-altitude conditions. Supercharging with “quality control” can be used to “purify” the process—that is, to reduce the toxicity and smokiness of the exhaust gases.

A supercharger unit uses a compressor, a turbocompressor, or a combination of the two. The most common type has a turbo-compressor driven by energy from the exhaust gases. Supercharger assemblies are used on almost all forms of vehicle dieseis (marine, locomotive, and tractor engines); in carburetor engines supercharging is limited by the onset of detonation. Among the main drawbacks of a supercharger assembly are increased mechanical and thermal stresses on the engine (caused by the higher pressure and temperature of the gases), reduced economy, and increased complexity of design.

The “built-in” superchargers include the dynamic type (formerly called the inertia, resonance, or acoustic type), in which the effect is obtained by means of vibratory phenomena in pipes; the ram type, which is used in piston aircraft engines at altitudes above the rated altitude and speeds above 500 km/hr; and the refrigeration superchargers, which achieve the effect by evaporating into the air supply a fuel or other combustible fluid with a low boiling point and a high heat of vaporization.

Dynamic supercharging, which can raise the admission coefficient ƞv, to 0.92–0.96 over a wide range of engine speeds with minor changes in the manifold design, is becoming increasingly common in vehicle internal-combustion engines. An increase in ƞv, by supercharging makes it possible to boost a diesel engine’s power when the fuel feed per cycle is increased or to improve economy while maintaining power (with the same fuel feed per cycle). Dynamic supercharging increases the life of components in the cylinder-piston group because of lower temperatures when operating on lean mixtures.

M. A. LITINSKII and G. I. MIKERIN

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Now, the free unlimited supercharging is back again, this time as a reward for a separate referral program.
Getting the new Model S or Model X with a referral code now comes not only with the new hardware upgrade, but also 5,000 miles of free supercharging, which is still a very good deal especially for those who only use the car for city driving.
Nothing automotive came of it until 1900, when Daimler-Benz patented its "Kompressor" for automobile supercharging. The name, by the way, is still used on their turbocharged cars today.
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On engines required to operate at altitudes sufficient to cause a power drop to less than sea-level output, supercharging can compensate for the loss of air density by forcing a larger volume of air into the cylinder.
Tesla's 1,000 miles of free Supercharging treats both the owner who makes the referral and the buyer who takes the referral as beneficiaries.
Audi AG (Audi), a subsidiary of Volkswagen AG (Xetra: VW), is equipping its vehicles with Eaton Corporation's (Eaton) (NYSE: ETN) supercharging system.
After mid-January, Tesla customers will get around 400 kilowatt-hours worth Supercharging credits per year with every Tesla car.
Tesla said in the announcement the Supercharging fees will be an incremental charge and cost less than gas.
The battery swap service stations will be added to the network of supercharging stations that Tesla is building around the nation.