Two-stroke diesel engine

A two -stroke diesel engine is operating on the two stroke principle diesel engine.

In the most today coming to use design, the fresh air is blown in at the bottom of the liner through inlet slots (ports). In order to suppress the combustion chamber gases through the exhaust valves into the exhaust system, it requires a higher pressure of fresh air - which usually provides a Roots blower.

Marine diesel

Marine diesel used in large cargo ships are usually slow-speed two-stroke diesel engines. Other applications include drives for trucks, locomotives, agricultural machinery and aircraft. Well-known examples are the two-stroke diesel engines of the series 53, 71, 92, 149 Detroit Diesel Corporation ( DDC), which is known as "Taiga Drum " DR series V 200, and the counter- piston engines by Junkers ( Jumo 205) and Napier (Napier Deltic ).

Aircraft engines

In the 30s of the 20th century there were aircraft engines like the Jumo 205, the 207 and the 223 ( list here).

In 1936 BMW built three diesel-powered BMW 114 ( aircraft engine ). This nine-cylinder radial engines had direct injection with air storage. Due to technical difficulties, the trials were discontinued in 1937.

Two-stroke diesel engines for aircraft are currently being eg offered by the company Delta Hawk Engines.

Roots blower

Two-stroke diesel engines had almost always Roots blower (eg Commer TS3 engine, or the Krupp Titan). For the most efficient heat engines ever, the two-stroke marine diesel engines to Roots blower often as auxiliaries and Anfahrgebläse. Once the turbocharger builds up enough pressure, it is turned off ( this may, instead of being driven by the crank mechanism in the fixed speed ratio, also have their own speed- decoupled drive, for example, an electric motor ). The Roots - loader of a motor is mechanically or electrically driven and consumed therefore - in contrast to the turbocharger, which gets its driving energy from the exhaust stream - a part of the performance.

Advantage

  • Comparatively good power to weight ratio. Few moving parts, therefore less prone to interference and durable. Since only low environmental requirements apply at sea, preferred use as a marine diesel engine.

Disadvantage

  • To achieve good efficiency, a high accuracy in the manufacture is necessary. However, no optimal values ​​with respect be achieved in fuel consumption and exhaust emission. The construction despite the impressive simplicity not prevail - Therefore, the two-stroke diesel engine in the automotive sector could - like the two-stroke gasoline engine.

( former ) Manufacturer

  • Brons N.V.
  • Commer Model TS 3
  • Detroit Diesel
  • Deutz AG
  • Electro-Motive Diesel
  • Hanomag
  • Hunt
  • Heinrich Lanz AG, motors of the Lanz Bulldog operate on the two-stroke cycle
  • Hirth diesel D22
  • Ilo diesel DL 660
  • Jenbacher Werke AG, today GE Jenbacher
  • Junkers Jumo 205
  • Krupp
  • MAN
  • Wärtsilä
  • Arnold Jung Locomotive Factory, Jungenthal at Kirchen / Sieg
Valvetrain Exhaust gas Junkers Jumo 223 Power-to-weight ratio Arnold Jung Lokomotivfabrik
838069
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