Optimization of a Multi-step Model for the Auto-ignition of Dimethyl Ether in a Rapid Compression Machine
نویسندگان
چکیده
The research presented here describes the numerical optimization of a multi-step ignition model to predict the auto-ignition of dimethyl ether (DME) in a rapid compression machine. The multi-step modeling concept is aimed at capturing the ignition behavior of new oxygenated fuel blends, where detailed or reducedmechanisms are not available. Experimental data for the ignition ofDME/O2/N2mixtures atmore than 60 different conditions were used by the optimizer to determine the 26 kinetic parameters of themultistep model that are unique to each individual fuel or fuel blend. The optimization was performed for conditions with compressed pressures in the range of 10-20 bar, compressed temperatures from 615 to 735 K, and equivalence ratios of 0.43, 0.75, and 1.5. In this region, DME exhibits two-stage ignition behavior. The first and overall ignition delay characteristics predicted by the multi-step model with the DME-optimized constants show good agreement with the experimental data for the majority of conditions tested.
منابع مشابه
Effect of Initial Temperature and EGR on Combustion and Performance Characteristics of Homogenous Charge Compression Ignition Engine Fueled with Dimethyl Ether
Homogeneous Charge Compression Ignition (HCCI) combustion is a pioneer method of combustion in which pre-mixed fuel and oxidizer (typically air) are compressed to the point of auto-ignition. HCCI engines can operate with most alternative fuels, especially, dimethyl ether (DME) which has been tested as a possible diesel fuel due to its simultaneously low NOx and PM emissions. In this paper a ...
متن کاملTheoretical and Experimental Analysis of OM314 Diesel Engine Combustion and Performance Characteristics Fueled with DME
Homogeneous Charge Compression Ignition (HCCI) combustion is a pioneer method of combustion in which pre-mixed fuel and oxidizer (typically air) are compressed to the point of auto-ignition. HCCI engines can operate with most alternative fuels, especially, dimethyl ether (DME) which has been tested as a possible diesel fuel due to its simultaneously low NOx and PM emissions. In this paper a ...
متن کاملPerformance Characterization and Auto-Ignition Performance of a Rapid Compression Machine
A rapid compression machine (RCM) test bench is developed in this study. The performance characterization and auto-ignition performance tests are conducted at an initial temperature of 293 K, a compression ratio of 9.5 to 16.5, a compressed temperature of 650 K to 850 K, a driving gas pressure range of 0.25 MPa to 0.7 MPa, an initial pressure of 0.04 MPa to 0.09 MPa, and a nitrogen dilution rat...
متن کامل2. British Petroleum (BP), “BP energy outlook 2035”, 2014 (January)
In recent years, many efforts have been made to reduce pollution in compression ignition engines. Dimethyl ether is one of the methods to achieve this goal due to its special properties such as high Cetane number and low pollution. Also, one of the parameters that plays an important role in improving combustion and engine performance is fuel injection pressure. In the present study, a numerical...
متن کاملResearch and Assessment of Applying Dimethyl Ether “DME” Extracted from Natural Gas “Ng”, on Diesel Engine as a Clean Fuel (TECHNICAL NOTE)
Due to the shortage of liquid hydrocarbon fuels for compression ignition engines, researchers have constantly been looking for alternative fuels. Recently, dim ethyl ether (DME) with its interesting properties, such as high cetane number and low exhaust emission has drawn a lot of interst as a suitable fuel for diesel engines. The main objective of this study was to assess the potentials and fe...
متن کامل