Article ID Journal Published Year Pages File Type
243847 Applied Energy 2011 11 Pages PDF
Abstract

The cycle-by-cycle variations in heat release are analyzed by means of a quasi-dimensional computer simulation and a turbulent combustion model. The influence of some basic combustion parameters with a clear physical meaning is investigated: the characteristic length of the unburned eddies entrained within the flame front, a characteristic turbulent speed, and the location of the ignition kernel. The evolution of the simulated time series with the fuel–air equivalence ratio, ϕ, from lean mixtures to over stoichiometric conditions, is examined and compared with previous experiments. Fluctuations on the characteristic length of unburned eddies are found to be essential to simulate the cycle-to-cycle heat release variations and recover experimental results. A non-linear analysis of the system is performed. It is remarkable that at equivalence ratios around ϕ ≃ 0.65, embedding and surrogate procedures show that the dimensionality of the system is small.

Related Topics
Physical Sciences and Engineering Energy Energy Engineering and Power Technology
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