Chemical kinetic model uncertainty minimization through laminar flame speed measurements

Chemical Kinetic Uncertainty Minimization through Laminar Flame Speeds of Mixtures of Air with C1-C4-Hydrocarbons

Performing high-fidelity simulations of complex reacting flows requires that the uncertainties associated with predictions of fundamental flame properties are characterized and minimized. Although the kinetics of C1-C4 hydrocarbon flames have been studied extensively in numerous past investigations, notable uncertainties exist. In the present study, the types of hydrocarbon fuels with the great...

PSFC-JA-08-10 Benchmarking of Alcohol Chemical Kinetic Mechanism for Laminar Flame Speed Calculations

Methanol and ethanol have been investigated as very high octane fuels for knock control/avoidance in spark ignition engines. Direct injection of the alcohol results in substantial cooling of the cylinder charge, decreasing the chemical kinetic rates that result in autoignition. However, decreasing the temperature of the cylinder charge also affects the initial flame propagation. The purpose of ...

Measurements of Laminar Flame Velocity for Components of Natural Gas

Radiation-Affected Laminar Flame Quenching

where p is the density, cp the specific heat at constant pressure, Su the laminar flame speed, Tb the flame temperature, subscript u the unburned gas and superscript 0 the adiabatic gas, ), the thermal conductivity, 7/= (rp/rR)"2 the weighted nongrayness, rp and rR being the Planck mean and the Rosseland mean of the absorption coefficient, ¢. the wall emissitivity, r = rMI the optical thickness...

Uncertainty-quantifying models for chemical-kinetic rates

In this study, strategies are proposed for modeling the input uncertainties in combustion calculations under chemical-rate uncertainties using as an example hydrogen-oxygen kinetics. For this purpose, this report is divided into the following sections. In Section 2, an assessment is made to ascertain the limitations of state-of-the-art treatments of experimentally-derived chemical-kinetic uncer...