The flow-field within a vortex-based solar cavity receiver with an open aperture
Date
2021
Authors
Long, S.
Lau, T.C.W.
Chinnici, A.
Nathan, G.J.
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Journal article
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Experimental Thermal and Fluid Science, 2021; 123(110314):110314-110314
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Abstract
We report a systematic experimental study to characterise the isothermal flow-field within a vortex-based solar cavity receiver with an open aperture. Measurements were performed using particle image velocimetry for a fixed flow rate through the inlet jets to achieve Reynolds number of ReD = 11800. A range of flowrates through the outlet were assessed for a fixed inlet flow rate, including that where the total outlet flow significantly exceeds the jet inflow to induce a net inflow through the aperture. Measured results reveal the presence of a central recirculation zone (CRZ) within all configurations considered here, with the strength and position of the CRZ depending on the amount of excess flow through the outlet. The magnitude of mean and root-mean-square velocities was found to be increased within the central region of the vortex receiver for open-aperture cases, while the excess outlet-flow tends to inhibit this increment. The results also show that increasing the excess outlet-flowrate can significantly reduce the flow egress through the aperture, while also increasing the flow ingress through the aperture.
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Copyright 2021 Elsevier