Counterflow ignition of n-butanol at atmospheric and elevated pressures Public Deposited

http://ir.library.oregonstate.edu/concern/articles/79408302t

Access to this item has been restricted by repository administrators at the request of the publisher, Elsevier, until July 21, 2017.

This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier and can be found at:  http://www.journals.elsevier.com/combustion-and-flame/

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Critical to the development of predictive combustion models is a robust understanding of the coupled effects of chemical kinetics and convective-diffusive transport at both atmospheric and elevated pressures. The present study describes a new variable-pressure non-premixed counterflow ignition experiment designed to address the need for well-characterized reference data to validate such models under conditions sensitive to both chemical and transport processes. A comprehensive characterization of system behavior is provided to demonstrate boundary condition and ignition quality as well as adherence to the assumption of quasi-one-dimensionality, and suggest limitations and best practices for counterflow ignition experiments. This effort reveals that the counterflow ignition experiment requires special attention to ignition location in order to ensure that the assumption of quasi-one-dimensionality is valid, particularly at elevated pressures. This experimental tool is then applied to the investigation of n-butanol for pressures of 1–4 atm, pressure-weighted strain rates of 200–400 s⁻¹, and molar fuel loadings of 0.05–0.25. Results are simulated using two n-butanol models available in the literature and used to validate and assess model performance. Comparison of experimental and numerical ignition results for n-butanol demonstrates that while existing models largely capture the trends observed with varying pressure, strain rate, and fuel loading, the mechanisms universally over-predict experimental ignition temperatures. While several transport coefficients are found to exhibit order-of-magnitude or greater sensitivities relative to reaction rates, variation of transport parameters is not able to account for the large deviations observed between experimental and numerical results. Further comparison of ignition kernel structure and fuel breakdown pathways between mechanisms suggests that an under-prediction in the growth rate of the radical pool may be responsible for both the deviation from the experimental results and the variation in ignition temperature results observed between mechanisms.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Brady, K. B., Hui, X., Sung, C. J., & Niemeyer, K. E. (2015). Counterflow ignition of n-butanol at atmospheric and elevated pressures. Combustion and Flame, 162(10), 3596-3611. doi:10.1016/j.combustflame.2015.06.017
Series
Keyword
Rights Statement
Funding Statement (additional comments about funding)
Publisher
Peer Reviewed
Language
Replaces

Relationships

Parents:

This work has no parents.

Last modified Default

Items