冠齿喷管射流冲击半圆形靶面的对流换热

doi:10.7527/S1000-6893.2020.24762

Abstract

Abstract: An experimental research is performed to illustrate the different mechanisms of the chevron nozzle in improving jet impingement heat transfer over concave and convex semi-circular target surfaces with the same relative curvature (d/D) of 0.1. The experimental tests are carried out with jet Reynolds numbers (Re) ranging from 5 000 to 12 000 and dimensionless nozzle-to-surface distances (H/d) ranging from 1 to 8. Simultaneously, computations based on the large eddy simulation approach are conducted with a specific jet Reynolds number to characterize the flow dynamics of the chevron jet impingement on the different target surfaces. Results show that both the nozzle shape and the target surface shape significantly affect the jet flow dynamics and heat transfer in the vicinity of jet stagnation. For the chevron nozzle, the streamwise vortices developed from the chevron notches change the vortical coherence of the axisymmetric toroidal vortices in the round jet development. Despite of the target surface shape, the chevron nozzle is confirmed to be capable of enhancing the jet impingement heat transfer related to the round nozzle. Compared to that on the convex surface, the jet impingement on the concave surface is affected by the recirculation flow inside the concave cavity, leading to a degradation of chevron-nozzle jet impingement heat transfer, particularly at large nozzle-to-surface distances.

Key words: jet impingement, chevron nozzles, concave target surface, convex target surface, convective heat transfer

CLC Number:

V235

LYU Yuanwei, ZHANG Jingzhou, SHAN Yong, SUN Wenjing. Convective heat transfer of chevron-nozzle jet impingement on semi-circular surfaces[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(7): 124762-124762.

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Convective heat transfer of chevron-nozzle jet impingement on semi-circular surfaces

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