Heat transfer performance investigation of rotating U-channel supercritical pressure hydrocarbon fuel with intermediate connection section.

To meet the challenge of the high temperatures faced by hypersonic vehicle electricity provision turbine blades, the blades are cooled with hydrocarbon fuel. For reducing the friction loss and improving the thermal performance, this paper designs and investigates the fuel flow mechanism and heat transfer law in the rotating channel with and without intermediate connection section. The results show that the channel with intermediate connection sections can reduce the friction coefficient of hydrocarbon fuel under rotating conditions and enhance the thermal performance. The connection section width H = 2D channel exhibits the best thermal performance and the lowest coefficient of friction. Compared to the channel without intermediate connection section, the thermal performance of the channel with connection section width H = 2 D is maximally enhanced by 3.71 times and the friction coefficient is maximally reduced by 98.9%. Compared to stationary, the thermal performance of the channel with a width of connection section H = 2 D is maximally enhanced by 10.78 times in rotating. Connecting sections will gradually replace 180° top turning sections. When the inlet temperature increases, the thermal performance of the channel can be improved by decreasing the width of the intermediate connecting section. • Channel with intermediate connection section reduces friction factor and improves thermal performance. • Channel TP with connection section is increased by a maximum of 3.71 times and f is decreased by a maximum of 98.9%. • Interaction of connection regions with heat transfer levels in other regions is key reason for h variations. • Connection section is gradually becoming main passageway to bridge the 1st and 2nd channels. • As H increases, h will rise then fall then rise and finally will fall. [ABSTRACT FROM AUTHOR]