Numerical investigation on the effect of fire compartment opening width and heat release rate on the horizontal projection of smoke plume in a full-scale atrium

2018 ◽  
Author(s):  
Mohammed Abdullah Mutafi ◽  
Mohammad Shakir Nasif ◽  
William Pao ◽  
Firas Basim Ismail
Keyword(s):  
Heat Release ◽  
Numerical Investigation ◽  
Heat Release Rate ◽  
Release Rate ◽  
Full Scale ◽  
Horizontal Projection ◽  
Smoke Plume ◽  
Opening Width

A Weakly Nonlinear Approach Based on a Distributed Flame Describing Function to Study the Combustion Dynamics of a Full-Scale Lean-Premixed Swirled Burner

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Davide Laera ◽  
Sergio M. Camporeale
Keyword(s):  
Heat Release ◽  
Limit Cycle ◽  
Heat Release Rate ◽  
Release Rate ◽  
Gas Turbines ◽  
Full Scale ◽  
Describing Function ◽  
Weakly Nonlinear ◽  
Lean Premixed ◽  
Flame Describing Function

Modern combustion chambers of gas turbines for power generation and aero-engines suffer of thermo-acoustic combustion instabilities generated by the coupling of heat release rate fluctuations with pressure oscillations. The present article reports a numerical analysis of limit cycles arising in a longitudinal combustor. This corresponds to experiments carried out on the longitudinal rig for instability analysis (LRIA) test facility equipped with a full-scale lean-premixed burner. Heat release rate fluctuations are modeled considering a distributed flame describing function (DFDF), since the flame under analysis is not compact with respect to the wavelengths of the unstable modes recorded experimentally. For each point of the flame, a saturation model is assumed for the gain and the phase of the DFDF with increasing amplitude of velocity fluctuations. A weakly nonlinear stability analysis is performed by combining the DFDF with a Helmholtz solver to determine the limit cycle condition. The numerical approach is used to study two configurations of the rig characterized by different lengths of the combustion chamber. In each configuration, a good match has been found between numerical predictions and experiments in terms of frequency and wave shape of the unstable mode. Time-resolved pressure fluctuations in the system plenum and chamber are reconstructed and compared with measurements. A suitable estimate of the limit cycle oscillation is found.

FULL-SCALE BURNING TESTS ON HEAT RELEASE RATE OF GASOLINE FIRE WITH WATER MIST

2002 ◽  
Vol 11 (1) ◽  
pp. 21-40 ◽  
Author(s):  
W. K. CHOW ◽  
Y. GAO ◽  
H. DONG ◽  
G. ZOU ◽  
L. MENG
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Water Mist ◽  
Full Scale

scholarly journals Polyisocyanurate Foam Pyrolysis and Flame Spread Modeling

2021 ◽  
Vol 11 (8) ◽  
pp. 3463
Author(s):  
Dushyant M. Chaudhari ◽  
Stanislav I. Stoliarov ◽  
Mark W. Beach ◽  
Kali A. Suryadevara
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Flame Spread ◽  
Release Rate ◽  
Full Scale ◽  
Insulation Material ◽  
Cone Calorimetry ◽  
Scanning Calorimetry ◽  
Microscale Combustion Calorimetry ◽  
Full Scale Tests

Polyisocyanurate (PIR) foam is a robust thermal insulation material utilized widely in the modern construction. In this work, the flammability of one representative example of this material was studied systematically using experiments and modeling. The thermal decomposition of this material was analyzed through thermogravimetric analysis, differential scanning calorimetry, and microscale combustion calorimetry. The thermal transport properties of the pyrolyzing foam were evaluated using Controlled Atmosphere Pyrolysis Apparatus II experiments. Cone calorimetry tests were also carried out on the foam samples to quantify the contribution of the blowing agent (contained within the foam) to its flammability, which was found to be significant. A complete pyrolysis property set was developed and was shown to accurately predict the results of all aforementioned measurements. The foam was also subjected to full-scale flame spread tests, similar to the Single Burning Item test. A previously developed modeling approach based on a coupling between detailed pyrolysis simulations and a spatially-resolved relationship between the total heat release rate and heat feedback from the flame, derived from the experiments on a different material in the same experimental setup, was found to successfully predict the evolution of the heat release rate measured in the full-scale tests on the PIR foam.

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