Correlation development and parametric investigation for thermal-hydraulic characteristics of flying-wing fin

The present study investigates thermal-hydraulic characteristics and structural parameters of the flying-wing fins. 165 cases based on the response surface method (RSM), considering 6 geometric parameters, are carried out. Firstly, the correlations of the flying-wing fin's heat transfer (j-factor) and flow friction (f-factor) are pro-posed using numerical simulations. The maximum deviations of the correlation with j-factor and f-factor are 8.53 % and 9.51 %, respectively. Secondly, the effects of geometric parameters are investigated respectively using the RSM model in detail at Re of 3000. The j-factor and f-factor are positively correlated with fin pitch (Fp) and amplitude (A) while negatively correlated with wavelength (L) and fin height (Fh). The j-factor and f-factor rise and subsequently drop as the inclined angle (theta) increases. Evaluating the thermal performance shows that the optimum theta is 80 degrees. The f-factor has a turning point at the angle of 75 degrees. Regarding the effects between pa-rameters, the lower f-factor can be obtained at large Fp when the fin is short while at small Fp when the fin is tall. The A and Fh change the trend of theta on j-factor and f-factor. Eventually, optimized geometrical parameters of the flying-wing fin are obtained by the desirability approach at Re = 3000.