engines and are mainly focused on biomass pyrolysis oils. An
example is the Mashproekt 2.5MW gas turbine, where industrial
solution was developed [10] and 2 MW OPRA gas turbine, where
research is still under way.
Apart from upper 1st generation biofuels and studies performed
on isolated components (i.e. spray characteristics, droplet combustion,
combustion chamber testing,) or studies dealing with isolated
phenomena, research activity in the range of micro turbines (MGT)
and fuels with less favorable properties is still limited. The pioneering
work on the use of pyrolysis oil was presented on a 100 kW
simple cycle MGT [11], where actual combustion properties of
pyrolysis oil were tested in the MGT for the first time. Recent studies
on the use of a wood, liquefied through solvolysis process that
has similar properties as the pyrolysis oil in a dedicated experimental
MGT were focused on different formulations of the fuel
[12], comparison to other polymer-derived fuels [13], influence
of fuel temperature [14] and on the effect of primary air temperature
[15].
In general, research of alternative/innovative fuels initially
focuses on fuel properties and mixture formation, combustion as
well as emission formation phenomena. This 1st level analysis is
certainly a prerequisite for utilization of such fuel. However, to
ensure also stable and durable operation of the MGT while using
alternative/innovative fuels a 2nd level analysis is necessary, that
addresses also degradation of materials and degradation of component
functionality. In case of diesel-like fuels, a decoupled 1st and
2nd level analysis is often sufficient. This is not necessarily the case
for fuels with deviant and thus less favorable properties, where
potentially a strong interrelation of the phenomena listed in blocks
in Fig. 1 might exist. In this case a coupled analysis addressing fuel
properties, combustion and emission formation phenomena as
well as degradation of materials and degradation of component
functionality is necessary. Such holistic approach ensures that
the design space is constrained early in the design or adaptation
process, providing a basis for efficient and optimized engine
adaptation process and eliminating the need for step backs in
adaptation procedure. To steer and to support such a decisionmaking
process, the paper presents methodologies and innovative
approaches for defining borders of design space and for identifying
interrelated phenomena among fuel properties, combustion and
emission formation, degradation of materials and degradation of
component functionality.