Conference proceeding
Modeling the Response of Spray Flames to Velocity Disturbances
AIAA Scitech 2021 Forum
AIAA Scitech Forum (Virtual, 01/11/2021–01/21/2021)
2021
Handle:
https://hdl.handle.net/2376/119970
Appears in Aviation Sustainability Center (ASCENT)
Abstract
Modern combustion systems use a range of operating paradigms such as gaseous premixed, gaseous non-premixed, and spray combustion. Each of these operating modes has its merits in terms of efficiency and power but they are all susceptible to thermoacoustic combustion instabilities. A key piece to understanding these instabilities from a prediction standpoint has been the development of reduced order mathematical models to understand the dynamics of the flame when subjected to various source disturbances. These source disturbances stem from several coupling mechanisms, the major of which have been identified as velocity coupled, equivalence ratio coupled and pressure coupled. Prior research has significantly advanced the modeling for premixed flame dynamics with some recent research also increasing focus on gaseous non-premixed or diffusion flames. However, reduced order modeling for spray flames has received sparse attention and thus this paper presents a modeling framework for the dynamics of spray flames with a focus on the velocity coupled response. The paper uses the classical Burke-Schumann diffusion flame configuration as a basis with the fuel introduced in the form of a spray of liquid droplets. The space-time dynamics in the model uses the fast-chemistry limit applied to the mixture fraction equation for both the gaseous and liquid phases. These equations are coupled through evaporation of the liquid droplets and results in new control parameters such as a Damkohler number for vaporization in addition to parameters pertaining to the spray and droplets themselves. The results from this formulation depict how changes in spray characteristics affect the flame response.
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Details
- Title
- Modeling the Response of Spray Flames to Velocity Disturbances
- Creators
- Vishal S. Acharya - Georgia Institute of Technology
- Publication Details
- AIAA Scitech 2021 Forum
- Conference
- AIAA Scitech Forum (Virtual, 01/11/2021–01/21/2021)
- Academic Unit
- Aviation Sustainability Center (ASCENT); Noise
- Grants
- 13-C-AJFE-GIT-058, Federal Aviation Administration (United States, Washington) - FAA
- Identifiers
- 99900621886101842
- Language
- English
- Resource Type
- Conference proceeding