Title
Towards Control-Oriented Modeling of Natural Gas-Diesel RCCI Combustion
Author
Bekdemir, C.
Baert, R.
Willems, F.
Somers, B.
Publication year
2015
Abstract
For natural gas (NG)-diesel RCCI, a multi-zonal, detailed chemistry modeling approach is presented. This dual fuel combustion process requires further understanding of the ignition and combustion processes to maximize thermal efficiency and minimize (partially) unburned fuel emissions. The introduction of two fuels with different physical and chemical properties makes the combustion process complicated and challenging to model. In this study, a multi-zone approach is applied to NG-diesel RCCI combustion in a heavy-duty engine. Auto-ignition chemistry is believed to be the key process in RCCI. Starting from a multi-zone model that can describe auto-ignition dominated processes, such as HCCI and PCCI, this model is adapted by including reaction mechanisms for natural gas and NOx and by improving the incylinder pressure prediction. The model is validated using NG-diesel RCCI measurements that are performed on a 6 cylinder heavy-duty engine. For three different engine operating points, it is operated at various diesel injection timings and NG-diesel blend ratios. The validation is focused on variables that are relevant for engine control, such as CA50, peak cylinder pressure, and engine-out NOx emissions. The validation shows that the multi-zone method with detailed chemistry reproduces the correct trends for important control parameters. From this validated model, real-time, map-based RCCI models are derived, which are considered to be an important step towards model-based NG-diesel RCCI control development.
Subject
Fluid Mechanics Chemistry & Energetics
PT - Power Trains
TS - Technical Sciences
Energy Emission
Mobility Industrial Innovation
Diesel
Natural gas
RCCI
To reference this document use:
http://resolver.tudelft.nl/uuid:01343491-b1ff-47ca-8dbe-18720e5a6948
DOI
https://doi.org/10.4271/2015-01-1745
TNO identifier
524645
ISSN
0148-7191
Source
SAE Technical Paper
Article number
2015-01-1745
Document type
article