Endwall and leading-edge film cooling of turbine blades in a hydrogen-fueled rotating detonation combustor-turbine coupled system

TL;DR

This paper uses 3D simulations to evaluate film cooling strategies on turbine blades in a hydrogen-fueled rotating detonation system, finding combined endwall and leading-edge cooling improves temperature control and flow stability.

Contribution

It introduces an integrated analysis of endwall and leading-edge film cooling effectiveness in a hydrogen RDC-turbine system, highlighting optimal configurations for cooling efficiency and stability.

Findings

Circular endwall cooling holes are more air-efficient than slot holes.

Vertical-inclined leading-edge cooling improves efficiency and flow stability.

Upstream detonation flow aids downstream diffusion of cooling jets.

Abstract

This study performs a three-dimensional numerical simulation of the coupled flow field in a hydrogen-air rotating detonation combustor (RDC)-turbine system to evaluate the effectiveness of different film cooling strategies for the turbine blades. The results demonstrate that combining the endwall cooling with leading-edge film cooling effectively reduces blade surface temperatures while improving turbine flow field stability and blade protection. For endwall cooling, numerical simulations compare circular and slot hole configurations. Circular holes consume less cooling air than slot holes while maintaining comparable cooling performance, making them the preferred choice. For the leading-edge film cooling, both the vertical and the vertical-inclined schemes are examined. The vertical-inclined scheme demonstrates higher cooling efficiency and improved secondary flow attachment, ensuring greater stability under the oscillatory effects of the detonation flow. Additionally, the flow fields of film-cooled turbine blades with and without the propagation of the rotating detonation wave are compared, revealing that the upstream rotating detonation flow field facilitates the downstream diffusion of secondary film cooling jets.