Presenting the Benefits - an Introduction to Combustion and Emissions | Aeristech

Presenting the Benefits – an Introduction to Combustion and Emissions

3rd August 2012

While attending the “2nd International Conference: Next Generation Off-Highway Engines” in Wiesbaden Germany, Aeristech provided a one day introductory Combustion and Emissions workshop.

Two members of Aeristech’s team presented the instructive overview of combustion and emissions, which included background science, design principals and modelling approaches. Understanding the combustion process enables developers to compare pertinent emission control strategies and explore how controlling the combustion process can reduce engine-out emissions (and reliance on emission control after treatment systems). Therefore the introductory workshop discussed various sophisticated technical approaches with reference to future NOx-emissions limits, concentrating on two broad topics: (1) General Combustion Principals (2) Technologies for Emission Reduction.

1. General Combustion Principals

  • Mixed an non-mixed, laminar and turbulent flames
  • Activation energy
  • Adiabatic flame temperature
  • Residence time
  • Fuel emissivity
  • Mean free path length
  • The chemistry of emissions
  • Stoichiometry
  • Reaction mechanisms
  • Types of emissions (SOx, NOx, CO2, etc)
  • The relative impact of various emissions in the atmosphere
  • Design of combustion processes
  • Combustion modelling approaches
  • Fuels and fuel additives
  • Typical challenges in designing piston engine combustion processes
  • Challenges in specific operating conditions: cold start, hot start, full load, idle, high speed, transients

2. Technologies for Emission Reduction

  • Catalytic converters
  • SCR
  • Filtration
  • EGR
  • Variable compression
  • Variable valve timing
  • Forced induction
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