Investigation of Initial Droplet Distribution and Importance of Secondary Breakup Model on Lean Blowout Predictions of a Model Gas Turbine Combustor

Labahn, Jeffrey; Ma, P.C.; Esclapez, L.; Ihme, Matthias; United States. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment; Stanford University

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Investigation of Initial Droplet Distribution and Importance of Secondary Breakup Model on Lean Blowout Predictions of a Model Gas Turbine Combustor

2017-04-01
By Labahn, Jeffrey ; Ma, P.C. ; Esclapez, L. ; ...

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Creators:

Labahn, Jeffrey ; Ma, P.C. ; Esclapez, L. ; Ihme, Matthias

Labahn, Jeffrey ; Ma, P.C. ; Esclapez, L. ; Ihme, Matthias Less -
Corporate Creators:

United States. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment ; Stanford University

United States. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment ; Stanford University Less -
Corporate Contributors:

United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy
Subject/TRT Terms:

[+]

ASCENT Flow Fields Fuel Gas Gas Turbine Fuels Lagrangian Functions Lean Blowout LES Spray
Resource Type:

Proceedings
Geographical Coverage:

United States
Corporate Publisher:

United States. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment ; Stanford University

United States. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment ; Stanford University Less -
Abstract:

In the present work, the importance of secondary droplet breakup and the impact of the initial droplet distribution on lean blowout (LBO) predictions is investigated to determine the sensitivity and robustness of the prediction to spray boundary conditions and secondary breakup models, respectively. This is accomplished using large-eddy simulations of a model gas turbine combustor, operating near the LBO limit. The flow field and gas phase chemistry is solved using an unstructured Navier-Stokes solver and a flamelet/progress variable formulation, respectively. Liquid spray is modeled using a polydisperse droplet injection and a Lagrangian spray evaporation model. Simulations with and without stochastic modeling of droplet breakup are performed. An analysis of the dropletWeber number indicates that large diameter droplets are above the criticalWeber number and should undergo secondary breakup. The present study demonstrates that secondary droplet breakup has a significant impact on the predicted droplet distribution and temporal evolution of the flame. Due to the large computational requirements of the current simulations, an ad-hoc approach to determining the initial droplet SMD and diameter is not feasible and a secondary droplet breakup model is required to reproduce the experimental trends.
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PDF
Funding:

13-C-AJFE-SU-005
Collection(s):

US Transportation Collection
Main Document Checksum:

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urn:sha256:57d219b2b2fbb38d49af6d049ae1dccfa8725efbd7091c83558ac4f0012d78e1
Download URL:

https://rosap.ntl.bts.gov/view/dot/50413/dot_50413_DS1.pdf
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Investigation of Initial Droplet Distribution and Importance of Secondary Breakup Model on Lean Blowout Predictions of a Model Gas Turbine Combustor

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