Results of Experiments and Models for Predicting Stability Limits of Turbulent Swirling Flames
| Autor: | Stefan Hoffmann, Heinrich Eickhoff, B. Lenze |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Engineering
Materials science Field (physics) Mathematical model business.industry Turbulence Mechanical Engineering Mixing (process engineering) Mechanical engineering Energy Engineering and Power Technology Aerospace Engineering Thermodynamics Mechanics Dissipation Combustion Stability (probability) Volumetric flow rate Fuel Technology Nuclear Energy and Engineering Extinction (optical mineralogy) Combustor business Energy (signal processing) |
| Zdroj: | Journal of Engineering for Gas Turbines and Power. 120:311-316 |
| ISSN: | 1528-8919 0742-4795 |
| DOI: | 10.1115/1.2818122 |
| Popis: | Swirling flames are used in many industrial applications like process furnaces, boilers and gas turbines due to their excellent mixing, stability, emission and burnout characteristics. The wide-spread use of swirl burners in the process and energy industries and, in particular, new concepts for the reduction of NOx-emissions raise the need for simple-to-use models for predicting lean stability limits of highly turbulent flames stabilized by internal recirculation. Based on recently published experimental data of the first author concerning the reaction structures of swirling flames operating near the extinction limit, different methods for predicting lean blow-off limits have been developed and tested. The aim of the investigations was to find stabilization criteria that allow predictions of blow-off limits of highly turbulent recirculating flames without the requirement for measurements in those flames. Several similarity criteria based on volumetric flow rates, burner size and material parameters of the cold gases, were found to be capable of predicting stability limits of premixed and (in some cases) nonpremixed flames at varying swirl intensities, burner scales and fuel compositions. A previously developed numerical field model, combining a k,ϵ-model with a combined “assumed-shape Joint-PDF”/Eddy-Dissipation reaction model was also tested for its potential for stability prediction. |
| Databáze: | OpenAIRE |
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