Etude de la combustion de gaz de synthèse issus d'un processus de ...

Numerical simulation of a syngas-fuelled engine
Figures 6.9-6.10 show that the adapted code is able to reproduce fairly good the RCM
in-cylinder pressure. Main discrepancies are found in the combustion phase especially
for short ignition timings. On the expansion phase, pressure curve come back to match
with experimental result fairly well. These discrepancies can be explained from both the
experimental and numerical results. From the experimental point of view, RCM
leakages, which correspond to mass losses especially at elevated pressures, can be a
reasonable cause for the lower pressures. From the numerical point of view, there are
various factors that can be source of errors due to the code adaptation to the RCM
characteristics, namely:
tel-00623090, version 1 - 13 Sep 2011
- The heat transfer coefficient that was tested on the compression stroke with
very good performance, however it lacks of verification for the expansion stroke.
- The turbulence intensity used on the burning rate model was tacked from
experimental results of the single compression, thus it lacks of verification for
the expansion stroke;
- Other minor errors like the in-cylinder volume polynomial fitting and the
equivalent rotation speed. The latter directly affects the heat transfer coefficient.
6.4. Syngas fuelled-engine
For small scale cogeneration units (