Engine Thermodynamic Cycle Simulation Block Library
This simulation tool is based on the MATLAB/Simulink platform, therefore it comes with the familiar Simulink graphical user interface for the assembly of system models from already available and verified library blocks. Typically, each block has a piece of computer code associated with it (developed at TSC). With this block library, simulation models of internal combustion engines can be built quickly and efficiently. The basic formulation is a zero-dimensional (or ‘lumped sum’) modeling, meaning that the engine cylinder, intake/exhaust manifolds and other system components that contain the working medium are each represented with their unique pressure, temperature, and species mass fraction figures, without spatial resolution within the component. Engine components that can be modeled include the power cylinder, intake/exhaust manifolds, intake/exhaust valves, turbochargers with all their measured performance maps, superchargers, exhaust gas recirculation system (EGR) coolers, intake air coolers, etc. Two-, four-, or six-stroke cycle operation, deactivated cylinders etc. or any other complex operation strategies are easily set with generic periodic functions. Fuel burning rate for different types of combustion can be prescribed with a lookup table. The medium is a mixture of the five basic compounds found in an internal combustion engine cylinder, which include N2, O2, CO2, H2O and CxHyOz generic fuel. The elements/compounds (except for H2O) are real gases approximated with the Beattie-Bridgeman equation of state. For water/steam, the thermodynamic properties are looked up from the complete thermodynamic property tables. This allows the accurate simulation of water injection systems and Rankine cycle engines. With appropriate property table input, organic Rankine cycle engines can also be simulated. Species mass fractions are calculated in each of the volumes. Concentration of NOx, CO, SO2 and other emissions related species are not calculated and therefore prediction of pollutant emissions is not attempted. The typical simulation outputs include species mass fractions, pressures, temperatures and enthalpies in the system volumes and the thermodynamic and volumetric efficiencies. A post processing tool to evaluate energy balance throughout the whole system is also available.
Examples of projects that can be supported with the Engine Thermodynamic Cycle Simulation Block Library include:
Optimization of engine intake and exhaust valve flow areas
Optimization of engine intake and exhaust valve timing for variable valve actuation systems
3. Optimization of combustion strategies for best thermodynamic efficiency
4. Sizing of turbocharger or supercharger
5. Sizing of exhaust gas recirculation system (EGR system)
6. Design and development of new and experimental engine concepts such as air injection and water injection engines
7. Design and development of exhaust gas energy recovery systems
8. Second law analyses of engine systems
Examples of projects that can be supported with the Engine Thermodynamic Cycle Simulation Block Library include:
Optimization of engine intake and exhaust valve flow areas
Optimization of engine intake and exhaust valve timing for variable valve actuation systems
3. Optimization of combustion strategies for best thermodynamic efficiency
4. Sizing of turbocharger or supercharger
5. Sizing of exhaust gas recirculation system (EGR system)
6. Design and development of new and experimental engine concepts such as air injection and water injection engines
7. Design and development of exhaust gas energy recovery systems
8. Second law analyses of engine systems
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