Multiple-jet impingement heat transfer performance in a double-wall cooling structure with pin fins and film effusion holes has been studied experimentally and numerically. Transient Liquid Crystal (TLC) thermography experimental method was used to explore the heat transfer characteristics on three target plates:flat plate, pin fin plate and pin fin plate with effusion holes. The jet-to-plate spacing was fixed to 1.5, and the Reynolds number based on the jet diameter ranges from 15 000 to 30 000. The experimental results show that the pin fin and effusion holes structure reduces the strength of the cross flow in the downstream region, improves and uniforms the heat transfer on the whole target plate obviously. When Reynolds number equals 15 000, there is a highest improvement of averaged Nusselt number on the endwall. Compared with that of the flat plate, the averaged Nusselt number of the pin fin plate and pin fin + effusion holes plate increases by 6.3% and 25.3%. For the numerical method, SST (Shear Stress Transport) k-ω turbulence model was employed to get an understanding of the flow structure and heat transfer on the pin fin and effusion holes surfaces.
RAO Yu
,
LIU Yuyang
,
WAN Chaoyi
. Jet impingement heat transfer performance in a double-wall cooling structure with film effusion holes and pin fins[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018
, 39(1)
: 121418
-121418
.
DOI: 10.7527/S1000-6893.2017.121418
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