Otto cycle


Otto cycle
A thermodynamic cycle for the conversion of heat into work, consisting of two isentropic phases interspersed between two constant-volume phases. It is the four-stroke cycle of operation that produces the power within the cylinders of an internal combustion engine. The cycle is named after Dr Nicolas Otto, who introduced it in 1876.
Piston descends, inlet valve opens. Air drawn in at constant pressure (Line 1–2).
Piston ascends, both valves closed. Pressure increases and volume decreases to point 3, combustion at constant volume results in sharp pressure rise to point 4.
Increased pressure at constant volume forces piston down, resulting in increases in volume and drop in pressure (Line 4–5).
Exhaust valve opens, releasing combustion charge with rapid drop in pressure at constant volume (Line 5–2). Piston rises and forces remaining gases out of exhaust at constant pressure (Line 2–1). Cycle begins again at point 1.

Aviation dictionary. 2014.

Look at other dictionaries:

  • Otto cycle — Ot to cy cle (Thermodynamics) A four stroke cycle for internal combustion engines consisting of the following operations: First stroke, suction into cylinder of explosive charge, as of gas and air; second stroke, compression, ignition, and… …   The Collaborative International Dictionary of English

  • Otto cycle — See also: Otto engine and Four stroke engine Thermodynamics …   Wikipedia

  • otto cycle — Four stroke cycle consisting of the intake, compression, firing, and exhaust strokes, in honor of Otto Benz, the inventor. Also see four stroke cycle engine. It was named after the German engineer Dr. Nikolaus Otto (1832 1891) who first patented… …   Dictionary of automotive terms

  • otto cycle — ˈäd.(ˌ)ō, ˈä(ˌ)tō noun Usage: usually capitalized O Etymology: after Nikolaus A. Otto died 1891 German technician and inventor : a four stroke cycle for internal combustion engines of the type used in automobiles wherein the first stroke consists …   Useful english dictionary

  • Otto cycle — Thermodynam. an idealization of the thermodynamic cycle of the internal combustion engine with air as the working substance: intake of air at atmospheric pressure, then adiabatic compression, then ignition with an increase of pressure and… …   Universalium

  • Otto cycle — /ˈɒtoʊ saɪkəl/ (say otoh suykuhl) noun the working cycle of a four stroke internal combustion engine. {named after NA Otto, 1832–91, German engineer} …   Australian English dictionary

  • Otto cycle — noun the basic thermodynamic cycle of the normal four stroke internal combustion engine isentropic compression, constant volume heat addition, isentropic expansion, and constant volume heat …   Wiktionary

  • Otto cycle engine — karbiuratorinis variklis statusas T sritis Energetika apibrėžtis Vidaus degimo variklis, kuriame degusis mišinys ruošiamas karbiuratoriuje, o degimo kameroje uždegamas žvake. atitikmenys: angl. Otto cycle engine; Otto engine vok. Benzinmotor, m;… …   Aiškinamasis šiluminės ir branduolinės technikos terminų žodynas

  • Otto (disambiguation) — Otto is a given name of Germanic origin. Otto may also refer to: Contents 1 Companies 2 Fictional characters 3 Places …   Wikipedia

  • Otto (surname) — Otto is a surname, and may refer to Catherine Otto, author of echocardiography textbooks Dr. Douglas Otto, American school superintendent Felix Otto (born 1966), German mathematician Frei Otto (born 1925), German architect Gustav Otto (1883–1926) …   Wikipedia


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