Research Papers: Fuel Combustion

Comparison Between RCCE and Shock Tube Ignition Delay Times at Low Temperatures

[+] Author and Article Information
Ghassan Nicolas, Hameed Metghalchi

Department of Mechanical
and Industrial Engineering,
Northeastern University,
Boston 02115, MA

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received April 16, 2015; final manuscript received April 21, 2015; published online June 16, 2015. Assoc. Editor: Reza H. Sheikhi.

J. Energy Resour. Technol 137(6), 062203 (Nov 01, 2015) (4 pages) Paper No: JERT-15-1151; doi: 10.1115/1.4030493 History: Received April 16, 2015; Revised April 21, 2015; Online June 16, 2015

The rate-controlled constrained-equilibrium (RCCE) method is a reduction technique based on local maximization of entropy or minimization of a relevant free energy at any time during the nonequilibrium evolution of the system subject to a set of kinetic constraints. In this paper, RCCE has been used to predict ignition delay times of low temperatures methane/air mixtures in shock tube. A new thermodynamic model along with RCCE kinetics has been developed to model thermodynamic states of the mixture in the shock tube. Results are in excellent agreement with experimental measurements.

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Grahic Jump Location
Fig. 1

A typical prescribed pressure profile for CH4/air mixture in shock tube

Grahic Jump Location
Fig. 2

Comparison of ignition delay times between RCCE and shock tube experiments [29] with a prescribed pressure profile with τ = 0.7 ms and α = 4%/ms. Initial conditions are: Phi = 1.0 and P = 23 atm and temperature varying from 1076 to 1309 K.

Grahic Jump Location
Fig. 3

C1 chemistry-comparison in ignition delay time between RCCE and shock tube experiments [29] with a prescribed pressure profile with τ = 0.6 ms and α = 5%/ms. Initial conditions are Phi = 1.0, P = 40 atm, and temperature varying from 1085 to 1290 K.



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