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  Project summary

Project name:

Name 

Project acronym: Kuerzel 
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Description: Non-stationary combustion in internal combustion engines or gas turbines is the main focus of the Collaborative Research Centre 606, cf. project cluster "Engine Combustion" and project cluster "Combustion Chamber". Modern combustion concepts for combustion chambers of gas turbines comprise lean premixed (LP) combustion. On the one hand lean premixed combustion is implemented as far as possible in stationary gas turbines (GT), since it allows reducing the production of thermal NOX. Unfortunately LP combustors are prone to combustion instabilities with both low and high frequencies. For these reasons and for safety aspects on the other hand technical combustors are operated "as premixed as possible" by means of the aerodynamic layout and combining diffusion (pilot) flames with premixed operation of the major part of the fuel. As an alternative to this the "rich-quenched-lean" (RQL) concept has been discussed, where the fuel is converted stepwise under rich and lean conditions and the air necessary for the dilution to the lean step is used to cool down the hot combustion gases. In partially premixed flames, diffusion flames and rich combustion conditions soot is formed intermediately which necessarily has to be oxidised before leaving the combustion chamber. The intermediately formed soot which possibly is emitted from the combustion devices forms another problem connected with technical combustion concept for gas turbines. Furthermore, technical combustors are requested to comprise fuel flexibility, viz. the utilization of gaseous and liquid fuels is desired. Premixing of prevaporized liquid fuels brings about the possibility of combustion instabilities that may be fortified until flash back and also the problem of soot formation in case of partially premixing.

All together, modern combustion concepts are faced with the problems of
  • low frequency instabilities,
  • high frequency instabilities,
  • soot formation and oxidation,
  • enhancement of the above problems by the application of liquid fuels.
Low frequency and high frequency combustion instabilities, utilization of liquid fuels, soot formation and oxidation have been widely investigated in the past in laboratory scaled devices and model systems. Scaling laws for prediction of these phenomena when upscaling the combustion device or varying the geometry, the thermal load, operating pressure or the number of single burners combined into a technical combustor, however, are for the most part missing. It is, therefore, the main goal of this subproject to realize a modular combustor where the above sketched problems can be investigated in substantial detail. The concept of this combustor is such that the investigation of effects of scaling up and numbering up of the system,
  • effects of aligning the single burners (annular, matrix or linear arrangement),
  • application of liquid fuels
on
  • low frequency combustion instabilities,
  • high frequency combustion instabilities,
  • soot formation and oxidation,
  • pressure variation
can be performed on the single elements as well as different sized combinations of single burners. The single burners are, furthermore, investigated in different subproject of the CRC 606 experimentally and numerically with the most advanced techniques and methods developed in the past within the CRC. The modular combustor above all serves as a test carrier for the "combustion family" which complements the facilities available at other research institutions, e.g. DLR Köln, IVT-DLR Stuttgart, TU-Darmstadt, RWTH-Aachen, and that are designed for other operating conditions and other objectives.


 
 
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