TY - GEN
T1 - Unsteady Pressure Measurements in a Heated Rotating Cavity
AU - Jackson, Richard
AU - Tang, Hui
AU - Scobie, James
AU - Pountney, Oliver
AU - Sangan, Carl
AU - Owen, Mike
AU - Lock, Gary
N1 - Funding Information:
This work was supported by the UK Engineering and Physical Sciences Research Council, under the grant number EP/P003702/1 in collaboration with the University of Surrey. The authors wish to thank Torquemeters Ltd (Northampton, UK) for their support with the rig design and build and acknowledge the helpful contributions of Marios Patinios and Dario Luberti.
Publisher Copyright:
© 2021 by ASME.
PY - 2021
Y1 - 2021
N2 - The flow in the heated rotating cavity of an aero-engine compressor is driven by buoyancy forces, which result in pairs of cyclonic and anticyclonic vortices. The resultant cavity flow field is three-dimensional, unsteady and unstable, which makes it challenging to model the flow and heat transfer. In this paper, properties of the vortex structures are determined from novel unsteady pressure measurements collected on the rotating disc surface over a range of engine-representative parameters. These measurements are the first of their kind with practical significance to the engine designer and for validation of computational fluid dynamics. One cyclonic/anticyclonic vortex pair was detected over the experimental range, despite the measurement of harmonic modes in the frequency spectra at low Rossby numbers. It is shown that these modes were caused by unequal size vortices, with the cyclonic vortex the larger of the pair. The structures slipped relative to the discs at a speed typically around 10% to 15% of that of the rotor, but the speed of precession was often unsteady. The coherency, strength and slip of the vortex pair increased with the buoyancy parameter, due to the stronger buoyancy forces, but they were largely independent of the rotational Reynolds number.
AB - The flow in the heated rotating cavity of an aero-engine compressor is driven by buoyancy forces, which result in pairs of cyclonic and anticyclonic vortices. The resultant cavity flow field is three-dimensional, unsteady and unstable, which makes it challenging to model the flow and heat transfer. In this paper, properties of the vortex structures are determined from novel unsteady pressure measurements collected on the rotating disc surface over a range of engine-representative parameters. These measurements are the first of their kind with practical significance to the engine designer and for validation of computational fluid dynamics. One cyclonic/anticyclonic vortex pair was detected over the experimental range, despite the measurement of harmonic modes in the frequency spectra at low Rossby numbers. It is shown that these modes were caused by unequal size vortices, with the cyclonic vortex the larger of the pair. The structures slipped relative to the discs at a speed typically around 10% to 15% of that of the rotor, but the speed of precession was often unsteady. The coherency, strength and slip of the vortex pair increased with the buoyancy parameter, due to the stronger buoyancy forces, but they were largely independent of the rotational Reynolds number.
UR - http://www.scopus.com/inward/record.url?scp=85115440988&partnerID=8YFLogxK
U2 - 10.1115/GT2021-59090
DO - 10.1115/GT2021-59090
M3 - Conference contribution
SN - 9780791884980
T3 - Proceedings of the ASME Turbo Expo
BT - Proceedings of ASME Turbo Expo 2021
PB - American Society of Mechanical Engineers (ASME)
CY - U. S. A.
T2 - ASME Turbo Expo 2021
Y2 - 7 June 2021 through 11 June 2021
ER -