Spray model evaluations for a reverse flow combustor

J. Spencer, S. James, Marcus Herrmann

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A previously studied computational fluid dynamic (CFD) fuel spray model used to characterize a pressure swirl atomizer under non-reacting conditions is implemented into a reverse flow combustor simulation. This spray model relies upon a stochastic secondary breakup model to predict the diameter distribution downstream of the atomizer and provides a robust method of simulating the fuel spray in CFD simulations. For 3 fuel nozzle shroud geometries, combustor simulations are performed using the aforementioned spray model and also a traditional model which is based upon inputting a diameter distribution measured experimentally. Reynolds averaged Navier-Stokes (RANS) and Large Eddy Simulation (LES) turbulence models are both used and comparisons of results are made amongst the two turbulence models. Rig test data was also available to compare with the two sets of CFD simulations. NOx emissions and combustor exit temperature metrics were used to compare CFD results to rig test data. The new spray model matches the performance of the current best practice approach at minimum and in some configurations yields more accurate results. Additionally, a blind validation study was performed with the new spray model and compared with rig data from 8 combustor configurations. In the first study, trends in NOx were correctly predicted by the LES/flamelet method with the new spray model however values were significantly under predicted. In both studies, the RANS/flamelet method with the new spray model is close in value of NOx with those seen in the rig data however the model misses the trend at some configurations. Overall, temperature metrics at the exit of the combustor are seen to be better predicted with LES.

Original languageEnglish (US)
Title of host publication51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
StatePublished - Aug 19 2013
Event51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 - Grapevine, TX, United States
Duration: Jan 7 2013Jan 10 2013

Publication series

Name51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

Other

Other51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013
CountryUnited States
CityGrapevine, TX
Period1/7/131/10/13

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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    Spencer, J., James, S., & Herrmann, M. (2013). Spray model evaluations for a reverse flow combustor. In 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013 (51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013).