Abstract
ABSTRACT In this article, three-dimensional periodic numerical model for fully developed flow in a cross wavy primary surface recuperator for a micro-gas turbine system is built. Influence of leakage of air hole on flow and heat transfer of high temperature gas core and compressed air core was analyzed. The results of analysis show that with leakage of air hole considered, flow velocity of compressed air from air hole flowing into gas core is far greater than that of high temperature gas. In addition, the flow is opposite to each other. As a result, the flow resistance in gas channel increases. With leakage of air hole considered, heat convection between gas core and air core weakens. When the diameter of air hole increases by 50 μm, maximum temperature in gas core increases by 1 K in a period. The performance of heat recovery for regenerator is degraded. Thermal ratio decreases with the improvement the diameter of air hole. When the diameter of air hole increases by 50 μm, thermal ratio decreases by about 0.3%. The flow in the gas and air channel is anti-symmetry along the center of channel. The flow of fluid is fluctuant. The flow velocity of gas is much larger than that of air. The research results can be used to guide checking the performance of a recuperator.
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