Numerical Research on Heat Transfer Characteristics of Supercritical RP-3 Aviation Kerosene in Vertical Internally-ribbed Tubes
Based on the structural optimization application of air-fuel heat exchanger,numer-ical research on heat transfer characteristics of supercritical RP-3 aviation kerosene in vertical internally-ribbed tubes were carried out.Mechanisms of the heat transfer deterioration along the flow direction and the non-uniform heat transfer of rib top-bottom along the circumferential di-rection were studied.The reason of deteriorated heat transfer was revealed by the fluid param-eters distributions in the near-wall region.The distributions of temperature field,flow field and turbulent kinetic energy in channel cross-sections were discussed,and the secondary flow influ-ence was analyzed based on the helicity and secondary flow intensity.The effects of operating pressure and rib number on heat transfer were investigated.The heat transfer correlation pre-diction was obtained.The results show that the first heat transfer deterioration is due to the decreased heat absorption capacity and the abnormal reduced turbulent kinetic energy,and the pseudo-film boiling leads to the second deteriorated heat transfer.The secondary flow is generated by the coupling of rib structure and variable density,the helicity increases along the flow direc-tion,and there is a coupling mechanism between the secondary flow intensity and heat transfer in the high temperature region.The proposed heat transfer correlations can effectively achieve the heat transfer prediction of supercritical aviation kerosene in three types of internally ribbed tubes.
internally ribbed tubesupercritical keroseneheat transfer deteriorationsecondary flowhelicity
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