TY - JOUR

T1 - Flow Instability Control in a Model Swirl-Stabilized Combustor with Central Jet Injection

AU - Savitskii, Alexey

AU - Sharaborin, Dmitriy

AU - Chikishev, Leonid

AU - Dulin, Vladimir

N1 - This research was supported by the Ministry of Science and Higher Education of the Russian Federation, agreement No. 075-15-2020-806.

PY - 2023/12

Y1 - 2023/12

N2 - Swirling flows often occur in nature and industrial applications. With an increase in swirl intensity, such rotating flows are known to become unstable and undergo a sudden breakdown of the vortex core, resulting in unsteady flow dynamics with intensive pressure fluctuations. In particular, swirling flows are organized in combustion chambers to stabilize the flame around the central recirculation zone, formed due to the vortex core breakdown. However, the impact of large-scale vortex structures, including the precessing vortex core and secondary helical vortices, on unsteady combustion regimes is still unclear. The present paper demonstrates experimentally that for the swirling flow of a model swirl combustor, the injection of a central jet may be used to alter the configuration of coherent flow structures, including helical vortices. In particular, the asymmetric hydrodynamics mode, associated with the precessing vortex core, is suppressed, whereas the symmetrical one becomes dominant. This effect demonstrates the importance of central jet injection to control the dominant mode of flow instability for the design of swirl combustors.

AB - Swirling flows often occur in nature and industrial applications. With an increase in swirl intensity, such rotating flows are known to become unstable and undergo a sudden breakdown of the vortex core, resulting in unsteady flow dynamics with intensive pressure fluctuations. In particular, swirling flows are organized in combustion chambers to stabilize the flame around the central recirculation zone, formed due to the vortex core breakdown. However, the impact of large-scale vortex structures, including the precessing vortex core and secondary helical vortices, on unsteady combustion regimes is still unclear. The present paper demonstrates experimentally that for the swirling flow of a model swirl combustor, the injection of a central jet may be used to alter the configuration of coherent flow structures, including helical vortices. In particular, the asymmetric hydrodynamics mode, associated with the precessing vortex core, is suppressed, whereas the symmetrical one becomes dominant. This effect demonstrates the importance of central jet injection to control the dominant mode of flow instability for the design of swirl combustors.

KW - flow control

KW - precessing vortex core

KW - proper orthogonal decomposition

KW - swirling flow

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85180681457&origin=inward&txGid=c3be649c0848d074c32b35cff21eed7c

UR - https://www.mendeley.com/catalogue/5148afc9-bc9e-36f5-b55f-d25de19d3bd8/

U2 - 10.3390/inventions8060148

DO - 10.3390/inventions8060148

M3 - Article

VL - 8

JO - Inventions

JF - Inventions

SN - 2411-5134

IS - 6

M1 - 148

ER -