Volume 58

Investigation of overall cooling effectiveness on a steam-cooled double-wall vane of hydrogen gas turbine with mist injections Ran Bi, Jizhou Chen, Dehai Kong, Shuo Ren, Sergey Isaev, Cunliang Liu

Abstract

Numerical studies were conducted to investigate the conjugate heat transfer characteristics of a mist/steam-cooled high-pressure turbine vane in a hydrogen gas turbine, which was proposed for a hydrogen fuel pure oxygen combustion gas turbine combined cycle with flow bypass and recompression. A double-wall cooling vane operating in a real turbine environment was considered. The effect of mist injections on the overall cooling effectiveness of the steam-cooled double-wall vane of a hydrogen gas turbine was investigated by varying the mist concentration (5% ≤ ms ≤ 20%) and droplet size (5μm ≤ dp ≤ 20μm). The ms and dp have a synergistic effect on the overall cooling effectiveness, and it tends to increase with increasing ms, especially at the suction side. The highest averaged overall cooling effectiveness of the steam-cooled vane at the mid-span of the vane was obtained at ms = 20% with a relatively small particle size of 10 μm, which was approximately 11% higher than that without mist, corresponding to an 88.6K drop in the vane‘s wall temperature.

Keywords hydrogen gas turbine, vane steam-cooling technology, conjugate heat transfer, mist injection