Homogeneous Charge Compression Ignition of Methane
Application ID: 1852
Homogeneous Charge Compression Ignition (HCCI) engines are being considered as an alternative to traditional spark- and compression-ignition engines. As the name implies, a homogeneous fuel/oxidant mixture is auto-ignited by compression with simultaneous combustion occurring throughout the cylinder volume. Combustion temperatures under lean burn operation are relatively low, resulting in low levels of NOx emission. Furthermore, the fuel’s homogeneous nature as well as the combustion process itself lead to low levels of particulate matter being produced.
Although HCCI combustion shows much promise, the method also suffers from a number of recurring problems, one of the more important being ignition timing. The following model examines the HCCI of methane, investigating ignition trends as a function of initial temperature, initial pressure, and fuel additives.
This model solves the reaction kinetics, mass, and energy balances describing the detailed combustion of methane in a variable-volume system. The large amount of kinetic and thermodynamic data required to set up the problem is readily made available by importing relevant files on the CHEMKIN format into the Reaction Engineering interface.
This model is included as an example in the following products:Chemical Reaction Engineering Module
however additional products may be needed to reproduce it. This example may be created and run using components from the following product combinations:
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.