Abstract
The work was based on Diesel-RK software code developed
in Bauman Moscow State Technical University and it was
carried out as a subcontract to VTT by the software group
of the university. The actors were Dr. Andrey Kuleshov,
Dr. Andrey Kozlov, and Dipl. Eng. Yury Fadeev. The work
is reported in Appendix 1.
The idea to use Diesel-RK code rose from the fact that
Diesel-RK can handle spray and combustion chamber
geometry unlike many 1D-simulation codes. Many
alternative fuels like pyrolysis oils and alcohols have
poor ignitability and need pilot injection in the engine.
Dual spray systems, however, have complicated interaction
and the geometry must be taken into account. Diesel-RK
had originally possibility to use only one injector per
cylinder. That's why the firsts step in the task was to
add a second injection system to the code. For an example
simulation case one was selected, where methanol is used
as main fuel and light fuel oil as pilot. A wish was also
set to be able to lean on Wärtsilä's combustion bomb
(CRU) results for estimating ignition delay. The adding
of second injection system to Diesel-RK succeeded well.
The angles and bore diameters of all injection holes can
now be selected freely, as well as start and end times of
each injection.
It appeared not to be easy to use the data gathered with
CRU in the simulation model. During the work, it was
leaned merely on the engine tests results, which were
gained in the frame of WP4. Finally a model, which gives
ignition delays and heat release curves reasonably well
for the example case, was created. There are in the code,
however, many parameters which must be correctly set for
each fuel to get right results. Critical data are also
fuel injection velocities into the cylinder.
Unfortunately they are very difficult to estimate.
As a conclusion, it seems that Diesel-RK is one tool,
which can help to describe the behaviour of a fuel(s) in
the engine, but the original target to be able to predict
the ignition delay and heat release of a new fuel in the
engine basing merely on bomb tests was not reached.
Original language | English |
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Publisher | CLEEN Cluster for Energy and Environment |
Number of pages | 40 |
ISBN (Print) | 978-952-5947-46-5 |
Publication status | Published - 2014 |
MoE publication type | D4 Published development or research report or study |
Keywords
- diesel enginer
- fule
- ignition
- combustion