Heat release rate and performance simulation of DME fuelled diesel engine using oxygenate correction factor and load correction factor in double Wiebe function

• Published in: Energy (Oxford) Vol. 150; pp. 77 - 91
• Main Authors: Loganathan, S., Leenus Jesu Martin, M., Nagalingam, B., Prabhu, L.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2018; Elsevier BV
• Subjects: Combustion; Combustion efficiency; Computer simulation; Diesel; Diesel engine; Diesel engines; Diffusion; Dimethyl ether; Double Wiebe function; Energy; Flow rates; Heat; Heat release rate; Heat transfer; Load correction factor; Low cycle fatigue; Mass flow; Mathematical models; Oxygenate correction factor; Parameter modification; Performance simulation; Simulation; Thermodynamic models; Thermodynamics; Vehicles; Heat release rate; Dimethyl ether; Performance simulation; Oxygenate correction factor; Diesel engine; Load correction factor; Double Wiebe function
• ISSN: 0360-5442; 1873-6785
• DOI: 10.1016/j.energy.2018.02.112

A computer simulation scheme with a rapid thermodynamic model is developed to predict the diesel engine HRR (heat release rate) and performance characteristics with DME as a fuel. The bmeps (MPa) are simulated as 0.5 (optimum power output) and 0.3, 0.4, 0.6 (other power outputs) with diesel and with DME in four steps sequentially. Initially, HRR is predicted by modifying four double Wiebe function parameters; the equations of heat release and combustion duration of diffusion phase and the efficiency factors of premixed and diffusion phase as 2.25 and 3.25 respectively (obtained by qualitative and approximate fitting by trial and error method). Obviously 99% combustion efficiency assumption with efficiency factor as 6.9 is excluded. Secondly, all Wiebe parameters are computed by using LCF (load correction factor which is the ratio between mass flow rates of diesel of optimum and other power output) alone and by using LCF and OCF (oxygenate correction factor which is the ratio between mass flow rates of DME and diesel of identical power output) in other steps. Premixed and diffusion phase peaks (J/degree) with DME are 13.73 and 31.47 (0.3 MPa); 23.18 and 47.25 (0.6 MPa). Performance predicted with 1.2% accuracy is validated by SAE and USA Army literature. •A new scheme of performance simulation for DME fuelled diesel engine is developed.•Heat release rates and power outputs are predicted by a 0D thermodynamic model.•Double Wiebe parameters are predicted by oxygenate and load correction factors.•Engine performance simulated is validated by the experimental data in the literature.•The performance parameters are predicted with an over all accuracy of 1.2%.