Trapped-Vortex in Ground Effect

2002 ◽  
Author(s):  
Darwin Garcia ◽  
Joseph Katz
Keyword(s):  
Ground Effect ◽  
Trapped Vortex

Trapped Vortex in Ground Effect

AIAA Journal ◽  
2003 ◽  
Vol 41 (4) ◽  
pp. 674-678 ◽  
Author(s):  
Darwin L. Garcia ◽  
Joseph Katz
Keyword(s):  
Ground Effect ◽  
Trapped Vortex

scholarly journals A review of cavity-based trapped vortex, ultra-compact, high-g, inter-turbine combustors

2018 ◽  
Vol 66 ◽  
pp. 42-82 ◽  
Author(s):  
Dan Zhao ◽  
Ephraim Gutmark ◽  
Philip de Goey
Keyword(s):  
Trapped Vortex

Numerical Studies on Trapped-Vortex Concepts for Stable Combustion

1998 ◽  
Vol 120 (1) ◽  
pp. 60-68 ◽  
Author(s):  
V. R. Katta ◽  
W. M. Roquemore
Keyword(s):  
Drag Coefficient ◽  
Reacting Flow ◽  
Flow Conditions ◽  
Third Order ◽  
Cold Flow ◽  
Flow Simulations ◽  
Numerical Studies ◽  
Dynamic Flows ◽  
Experimental Findings ◽  
Trapped Vortex

Spatially locked vortices in the cavities of a combustor aid in stabilizing the flames. On the other hand, these stationary vortices also restrict the entrainment of the main air into the cavity. For obtaining good performance characteristics in a trapped-vortex combustor, a sufficient amount of fuel and air must be injected directly into the cavity. This paper describes a numerical investigation performed to understand better the entrainment and residence-time characteristics of cavity flows for different cavity and spindle sizes. A third-order-accurate time-dependent Computational Fluid Dynamics with Chemistry (CFDC) code was used for simulating the dynamic flows associated with forebody-spindle-disk geometry. It was found from the nonreacting flow simulations that the drag coefficient decreases with cavity length and that an optimum size exists for achieving a minimum value. These observations support the earlier experimental findings of Little and Whipkey (1979). At the optimum disk location, the vortices inside the cavity and behind the disk are spatially locked. It was also found that for cavity sizes slightly larger than the optimum, even though the vortices are spatially locked, the drag coefficient increases significantly. Entrainment of the main flow was observed to be greater into the smaller-than-optimum cavities. The reacting-flow calculations indicate that the dynamic vortices developed inside the cavity with the injection of fuel and air do not shed, even though the cavity size was determined based on cold-flow conditions.

scholarly journals Energy Extraction Performance of Tandem Ground-effect Hydrofoils

2021 ◽  
Vol 809 (1) ◽  
pp. 012001
Author(s):  
Hao Yang ◽  
Guanghua He ◽  
Weijie Mo ◽  
Wei Wang
Keyword(s):  
Ground Effect ◽  
Energy Extraction ◽  
Extraction Performance
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