Accession Number : ADA429958

Title :   Determination of Laminar Flame Speed of Diesel Fuel for Use in a Turbulent Flame Spread Premixed Combustion Model

Descriptive Note : Briefing charts

Corporate Author : TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI

Personal Author(s) : Schihl, Peter ; Tasdemir, John ; Bryzik, Walter ; Schiele, Tom ; Schwarz, Ernie

PDF Url : ADA429958

Report Date : 30 NOV 2004

Pagination or Media Count : 25

Abstract : One of the key challenges facing diesel engine system modelers lies in adequately predicting the fuel burning rate profile given the direct relationship between energy release and key performance parameters such as fuel economy, torque, and exhaust emissions. Current state-of-the-art combustion sub-models employed in such system simulation codes rely heavily on empiricism and successful application of such sub-models for new engine designs is highly dependent on past experience with similar combustion systems. One common approach to address this issue is to expend great effort choosing associated empirical coefficients over a range of similar combustion system designs thus improving the potential predictive capability of a given empirical model. But, continual combustion system development and design changes limit the extrapolation and application of such generic combustion system dependent coefficients to new designs due to various reasons, including advancements in fuel injection systems, engine control strategy encompassing multiple injections, and combustion chamber geometry. In order to address these very difficult challenges, an extensive effort has been applied toward developing a physically based, simplified combustion model for military-relevant diesel engines known as the Large Scale Combustion Model (LSCM). Recent effort has been spent further refining the first stage of the LSCM two stage combustion model that is known as the premixed phase sub-model. This particular sub-model has been compared with high-speed cylinder pressure data acquired from two relevant direct injection diesel engines with much success based on a user defined parameter referred to as the laminar flame speed by the combustion community.

Descriptors :   *MODELS, *TURBULENT FLOW, *FLAMES, *BURNING RATE, *LAMINAR FLOW, *DIESEL FUELS, SIMULATION, DIESEL ENGINES, FUEL CONSUMPTION, COMBAT VEHICLES.

Subject Categories : Fluid Mechanics
      Combustion and Ignition
      Fuels
      Reciprocating and Rotating Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE