Aero-derivative

The GE LM2500 , derivative of the GE CF6 , used as a ship propulsion system

An Aero-derivative ( English aero derivative , mutatis mutandis "derived from the aviation industry") is a gas turbine , which originally as a jet engine has been developed, but for use as a combustion engine (as driving a generator for power generation or other work machine has been redesigned). It can be used stationary (often in a gas turbine or combined cycle power plant ) or mobile (e.g. as a drive for a ship).

The thrust nozzle is omitted in the redesign; Instead, a low-pressure turbine is connected downstream, in which the exhaust gas is expanded to (almost) atmospheric pressure and in this case the useful power is transferred to the machine via a shaft . The low-pressure turbine can be arranged on a shaft with the high-pressure turbine (extension of the turbine by a low-pressure part) or on its own, separately mounted shaft. With dual-flow engines , the fan is replaced by a low-pressure compressor.

Advantages and disadvantages

This article or the following section is not adequately provided with supporting documents ( e.g. individual evidence ). Information without sufficient evidence could be removed soon. Please help Wikipedia by researching the information and including good evidence.

From the engine origin, there are some specific advantages and disadvantages that distinguish aero-derivative gas turbines from gas turbines, which were designed as a power machine for stationary operation from the start (so-called frame or heavy-duty gas turbines):

• compact design, low weight, low wall thickness, very fast load gradients possible
• Machines are designed for open cycle and the efficiency is optimized for this operation, i.e. H. low exhaust gas temperature , less favorable for combined operation
• higher temperatures and pressures in the combustion chamber , as a result
  • generally shorter service life of the parts in the hot gas path
  • higher nitrogen oxide emissions
• Annular combustion chamber
• Restriction to services customary in aviation (<approx. 100 MW useful output); almost all aero-derivatives are industrial gas turbines .

providers

• General Electric
• Siemens
• SNECMA
• MAN Diesel & Turbo
• MTU Friedrichshafen / MTU Aero Engines
• Mitsubishi Heavy Industries (formerly Pratt & Whitney Power Systems)

literature

• Richard Doležal : Combined gas and steam power plants: construction and operation . Springer, 2000, ISBN 3-540-67526-4 .

Individual evidence

1. ↑ H.-P. Schiffer: Thermal turbo machines: aeroderivatives. (No longer available online.) Formerly in the original ; accessed on April 5, 2014 (lecture at TU Darmstadt, July 3, 2008).  ( Page no longer available , search in web archives )