Simulation of cooling performance of a simplified transform piece model

The impingement cooling performance on a convex curved surface subjected to accelerated mist/air flow was investigated. As a continuous effort to develop a realistic mist impingement cooling scheme, this paper focuses on simulating mist impingement cooling under typical gas turbine operating conditions of high temperature and pressure in a simplified model of transform piece (double chamber model). Furthermore the paper presents the effect of cooling effectiveness by changing the masses, sizes and impact velocities of the droplets. Based on the heat-mass transfer analogy, the results of mist cases compare with the none droplet case could be enhanced 320% (the maximum enhancement of adiabatic cooling effectiveness) cooling effectiveness and reduce 108 K of wall temperature. However, the effect of changing masses, dimensions and velocities of droplets on mist/air impingement cooling has little influence, which is different from mist/air film cooling's results.