Heat transfer characteristics in a trailing-edge slot cooling surface with outward protrusions

ABSTRACT

A novel turbulated cutback structure is designed for trailing-edge cooling, which has smooth-transition protrusions on the cutback surface. Experimental investigations are carried out on the effects of the protrusion configuration and the blowing ratio M on adiabatic cooling effectiveness and convective heat transfer coefficient of the cutback surface using transient thermochromic liquid crystal technology and steady pressure-sensitive paint technology as measuring methods. As M increases, the comprehensive heat transfer performance (heat flux ratio) first increases and then decreases, reaching a peak at M = 1.00. The smooth-transition protrusions effectively enhance the comprehensive heat transfer performance by 12.4 ~ 36.8% of the cutback surface.

KEYWORDS:

• Trailing-edge slot
• heat transfer characteristic
• protrusion
• film cooling
• experimental measurement

Nomenclature

Table

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

We would like to acknowledge financial supports for this work provided by the National Natural Science Foundation of China (Grant No. 51922060), the National Science and Technology Major Project (Grant No. J2019-III-0019-0063), and the China Postdoctoral Science Foundation (Grant No. 2021TQ0166 and No. 2021M701850).