Accession Number:

ADA537504

Title:

Experiments and Modeling of Impinging Jets and Premixed Hydrocarbon Stagnation Flames

Descriptive Note:

Doctoral thesis

Corporate Author:

CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS

Personal Author(s):

Report Date:

2005-05-26

Pagination or Media Count:

242.0

Abstract:

The development of a predictive chemical-kinetic model to describe the combustion of hydrocarbon fuels is one of the most important research areas in combustion. The key to understanding and modeling the combustion of hydrocarbon fuels is to obtain an accurate chemical-kinetic model for the oxidation of C1 and C2 hydrocarbons. As longer hydrocarbon chains are investigated, all of the reactions associated with smaller hydrocarbons must be included, as well as reactions that account for the breaking up of these chains into C1 and C2 fragments. In order to model the combustion of gasoline, kerosene, or other long-chain hydrocarbon fuels, the combustion chemistry of methane ethane, ethylene, etc., must first be accurately modeled. Unfortunately, due to a lack of kinetically independent experimental data, a generally accepted mechanism for methane is still elusive. This experimental study is aimed at developing a technique that can quickly and accurately obtain measurements to further constrain and validate these mechanisms, towards the eventual development of a fully constrained kinetics mechanism for small hydrocarbons. The approach presented here relies on detailed measurements of strained flames in a jet-wall stagnation flow. This setup yields a flow with boundary conditions that can be accurately specified, facilitating simulation and comparisons with experiment. The diagnostics are optimized for accuracy, minimal flame disturbance and rapid simultaneous recording of flow velocity and CH radical profiles. Flame simulations utilize a one-dimensional hydrodynamic model, a multicomponent transport formulation, and various detailed-chemistry models. Direct comparisons between experiment and simulation allow for an assessment of the various models employed, with an emphasis on the chemistry model performance. Cold impinging jets are an important flow in many conte

Subject Categories:

  • Combustion and Ignition
  • Fuels

Distribution Statement:

APPROVED FOR PUBLIC RELEASE