An equivalent dissipation rate model for capturing history effects in non-premixed flames

Kundu, Prithwish; Echekki, Tarek; Pei, Yuanjiang; Som, Sibendu

doi:10.1016/j.combustflame.2016.10.001

An equivalent dissipation rate model for capturing history effects in non-premixed flames

Journal Article · Tue Jan 31 23:00:00 EST 2017 · Combustion and Flame

DOI:https://doi.org/10.1016/j.combustflame.2016.10.001· OSTI ID:1460976

Kundu, Prithwish; Echekki, Tarek; Pei, Yuanjiang; Som, Sibendu

The effects of strain rate history on turbulent flames have been studied in the. past decades with 1D counter flow diffusion flame (CFDF) configurations subjected to oscillating strain rates. In this work, these unsteady effects are studied for complex hydrocarbon fuel surrogates at engine relevant conditions with unsteady strain rates experienced by flamelets in a typical spray flame. Tabulated combustion models are based on a steady scalar dissipation rate (SDR) assumption and hence cannot capture these unsteady strain effects; even though they can capture the unsteady chemistry. In this work, 1D CFDF with varying strain rates are simulated using two different modeling approaches: steady SDR assumption and unsteady flamelet model. Comparative studies show that the history effects due to unsteady SDR are directly proportional to the temporal gradient of the SDR. A new equivalent SDR model based on the history of a flamelet is proposed. An averaging procedure is constructed such that the most recent histories are given higher weights. This equivalent SDR is then used with the steady SDR assumption in 1D flamelets. Results show a good agreement between tabulated flamelet solution and the unsteady flamelet results. This equivalent SDR concept is further implemented and compared against 3D spray flames (Engine Combustion Network Spray A). Tabulated models based on steady SDR assumption under-predict autoignition and flame lift-off when compared with an unsteady Representative Interactive Flamelet (RIF) model. However, equivalent SDR model coupled with the tabulated model predicted autoignition and flame lift-off very close to those reported by the RIF model. This model is further validated for a range of injection pressures for Spray A flames. The new modeling framework now enables tabulated models with significantly lower computational cost to account for unsteady history effects. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1460976

Journal Information:: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: C Vol. 176; ISSN 0010-2180

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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A Novel In Situ Flamelet Tabulation Methodology for the Representative Interactive Flamelet Model Kundu, Prithwish; Scroggins, Joseph; Ameen, Muhsin M. Combustion Science and Technology, Vol. 192, Issue 1 https://doi.org/10.1080/00102202.2018.1539715	journal	November 2018
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