B.Sc. (Alberta); Ph.D. (Cambridge)
|website:||Combustion Simulation Laboratory|
- Numerical Simulation
- Computational Fluid Dynamics
- IC Engines
- Thermal Power Generation
Current Research Work
My research is in turbulent combustion. I have been developing methods for numerical simulation of turbulent combustion, including the development of a new modelling approach which has come to be known as Conditional Source-term Estimation. I have also been involved in experimental work; my research group has commissioned two different experimental facilities for the study of the ignition and combustion of methane and natural gas in engines.
- Reynolds Averaged Navier-Stokes: Here, the governing equations in their ensemble-averaged form are solved to obtain either steady or transient flow fields using both commercial CFD packages and in-house, flow-specific codes. Models must be provided for the dissipation of energy due to turbulence. In the case of reacting flows, models must also be provided for the averaged chemical source-terms. Applications range from fundamental studies to industrial applications for use in design optimization.
- Large Eddy Simulation: In LES, the governing equations are spatially filtered such that only the large scale motions in the flow are resolved on the computational grid. Models must be provided for the dissipation of energy at unresolved scales. In the case of reacting flows, models must be provided for the chemical source-terms as well because they are also under-resolved in simulations of most practical flames. Here we have been focusing on careful validation of models against DNS and experimental data for simple laboratory-scale flames.
- Fundamental ignition simulations: We are also studying autoignition using the relatively new Stochastic Particle Model, which solves the chemical Master equation using a Monte Carlo technique. Using this method, the autoignition delay time becomes a random variable. This study has significant implications for the operation and control of Homogeneous-Charge Compression Ignition (HCCI) engines.
- Shock-tube Research: We have been studying ignition experimentally using a shock-tube facility. Our earlier work involved examining ignition of homogeneous mixtures of gaseous fuels and air. We used that data to develop chemical kinetic mechanisms that are substantially better at predicting the autoignition of natural gas-like fuels in air under engine-relevant conditions. Our most recent work has been studying autoignition of turbulent jets of methane injected into the shock-tube using optical diagnostics. This data has been used for validation of our simulation tools.
- Single-Cylinder Research Engine: We have a unique diesel engine facility in which a 6-cylinder production diesel engine has been modified to fire on only one cylinder. This engine is fully instrumented for research purposes and we have been using this to study High-Pressure Direct-Injection (HPDI) of natural gas using exhaust gas recirculation (EGR).
- MECH 270: Thermodynamics
- MECH 375: Heat Transfer
- MECH 479: Computational Fluid Dynamics
- MECH 579: Advanced Computational Fluid Dynamics
- MECH 576: Combustion
- MECH 586: Turbulent Shear Flows
- K. Luo, H. Wang, W. K. Bushe, and J. Fan, “Direct numerical simulation and reaction rate modelling of premixed turbulent flames,” International Journal of Hydrogen Energy, 2014.
- M. Mahdi Salehi, W. Kendal Bushe, N. Shahbazian, and C. Groth, “Modified laminar flamelet presumed probability density function for LES of premixed turbulent combustion,” Proceedings of the Combustion Institute, vol. 34, no. 1, pp. 1203–1211, 2013.
- S. Munshi, G. P. McTaggart-Cowan, W. K. Bushe, and S. N. Rogak, Method and apparatus for providing for high EGR gaseous-fuelled direct injection internal combustion engine. Google Patents, 2007.
- R. W. Grout, W. K. Bushe, and C. Blair, “Predicting the ignition delay of turbulent methane jets using Conditional Source-term Estimation,” Combustion Theory and Modelling, vol. 11, no. 6, pp. 1009–1028, 2007.
- G. P. McTaggart-Cowan, H. L. Jones, S. N. Rogak, W. K. Bushe, P. G. Hill, and S. R. Munshi, “Direct-Injected Hydrogen-Methane Mixtures in a Heavy-Duty Compression Ignition Engine,” SAE Technical Paper, 2006.
- G. D. Sullivan, J. Huang, W. K. Bushe, and S. N. Rogak, “Auto-ignition of Transient Turbulent Gaseous Fuel Jets at High Pressure,” SAE Technical Paper, 2006.
- G. D. Sullivan, J. Huang, T. X. Wang, W. K. Bushe, and S. N. Rogak, “Emissions variability in gaseous fuel direct injection compression ignition combustion,” SAE Technical Paper, 2005.
- J. R. L. Ramirez, W. K. Bushe, and A. Frisque, “Conditional Moment Closure Based on Two Conditioning Variables,” in Progress in Turbulence, Springer, 2005, pp. 103–106.
- G. P. McTaggart-Cowan, W. K. Bushe, S. N. Rogak, P. G. Hill, and S. R. Munshi, “The effects of varying EGR test conditions on a direct injection of natural gas heavy-duty engine with high EGR levels,” SAE Technical Paper, 2004.
- W. K. Bushe and H. Steiner, “Laminar flamelet decomposition for conditional source-term estimation,” Physics of Fluids (1994-present), vol. 15, no. 6, pp. 1564–1575, 2003.