Effect of subsonic microjets on cold flow in dump combustors

K. Russell, K. Sengupta, F. Mashayek, A. Taha

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


Fluidic control of shear layers in air-breathing liquid-fuel combustors is considered as a viable means for improving performance. The increasing demand for compact combustion accompanied by low drag, high turndown ratio, and a reliable flame anchor calls for concurrent application of advanced control strategies such as counter-current shear and microjets. Traditional flame holders, such as the backward-facing step dump combustor, provide a protective environment for the flame to reside. However, these systems also carry a significant drag penalty. The focus of this research is to explore the role of microjets as a shear layer control strategy in dump combustors via numerical simulation. The simulations have been conducted within the Reynolds-averaged Navier-Stokes (RANS) framework. Results for cold flow have shown that increasing the momentum of the microjets leads to greater non-uniformity in the turbulent flow field. Microjets can also affect the recirculation zone, thus influencing flame stabilization. Many parameters such as the location, size, mass flow rate ratio, and momentum ratio of the microjets determine the overall performance. A detailed parametric study is conducted to investigate the effect of various parameters.

Original languageEnglish (US)
Title of host publication46th AIAA Aerospace Sciences Meeting and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781563479373
StatePublished - 2008

Publication series

Name46th AIAA Aerospace Sciences Meeting and Exhibit

ASJC Scopus subject areas

  • Aerospace Engineering


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