Combustion of n-heptane in porous inert medium

Application of porous inert medium (PIM) to internal combustion engines(ICE) promises high efficiency, low emissions and general practicability. The constant volume ignition of n-heptane droplets in PIM was simulated by a zero dimensional model using detailed chemical kinetics. Empirical relations for heat and mass transfer coefficients were used in the model, and Raoults law was employed to account for chemical equilibrium at the droplet surface. A homogeneous isotropic black-body radiation was assumed within PIM. Under normal conditions, PIM remained at a nearly constant temperature. Results show that PIM can drastically reduce the ignition delay time. This is of great benefit to ignition control of ICEs. Rate-of-pressure-rise can also be reduced, leading to a relatively low noise level. Emissions are, in general, relatively low.