Parametric Studies of Laminated Cooling Configurations: Overall Cooling Effectiveness

Abstract

Combing the advantages of film cooling, impingement cooling, and enhanced cooling by pin fins, laminated cooling is attracting more and more attention. This study investigates the effects of geometric and thermodynamic parameters on overall cooling effectiveness of laminated configuration, and model experiments were carried out to validate the numerical results. It is found that the increases in film cooling hole diameter and pin fin diameter both result in the increase in cooling effectiveness, but the increases in impingement hole diameter, impingement height, and spanwise hole pitch degrade the cooling performance. The increase of the coolant flow rate causes the increase in cooling efficiency, but this effect becomes weaker at a high coolant flow rate. The coolant-to-mainstream density ratio has no obvious effect on cooling effectiveness but affects wall temperature obviously. Moreover, based on the numerical results, an empirical correlation is developed to predict the overall cooling efficiency in a specific range, and a genetic algorithm is applied to determine the empirical parameters. Compared with the numerical results, the mean prediction error (relative value) of the correlation can reach 8.3%.

Experimental Study on Overall Cooling Effectiveness of Three-layer Laminate for Stealth Aircraft Tail Boom

“…As a result, the cooling uniformity is improved. With the impingement distance increases, the momentum loss caused by vortex on both sides of the impingement jet increases, which attenuates the impingement cooling ability [10] . On the other hand, increasing the impact distance also leads to an increase in the volume of the impingement chamber, which reduces the resistance of coolant flowing to other regions in the chamber.…”

“…Xiao Dong Zhang and Qing Hua Deng et al [9] studied respectively the influences of film hole size and coolant ejection angle on overall cooling effectiveness of laminate with the conjugate heat transfer method. The study from Chen Wang [10] revealed the effects of geometric and thermodynamic parameters on overall cooling effectiveness of laminated configuration.…”