Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2023 - September 06, 2023
The OME (polyoxymethylene dimethyl ether) synthesized from CO2 captured by carbon recycling technology and H2 generated from renewable energy, is of interest as a carbon-neutral automotive fuel. The OME is expected to be an alternative diesel fuel because it has oxygen atoms in its molecule and no C-C bond. It has consequentially showed a positive effect in extremely low soot emissions compared with diesel fuel. However, there have been no comprehensive studies of the effects of multi-hole nozzle injection on OME spray and combustion characteristics. In this study, the effects of multi-hole nozzle injectors on spray, combustion, and emission characteristics are investigated by performing OME spray simulations that would accurately reflect the characteristics of each nozzle-hole injection quantity. In order to obtain the parameters necessary for simulation model, spray visualization and injection rate measurement were carried out using a constant volume vessel and momentum method respectively. The experimental result showed that the variation in spray penetration length and injection rate between nozzle holes increased in the enlarged nozzle hole injector. In numerical simulation, our simulation method accounting the injection rate of each hole was applied which was different from the conventional method using a single injection rate representing multi-hole quantities. The ignition delay time measured from the conventional simulation method was found to be 0.025 MS equivalent to 0.30 CAD at 2000 rpm and shorter than that using our method.
