Effects of wall heat transfer on performance and flow for micro radial inflow turbine

In order to investigate the effects of heat transfer on performance and flow characteristics of micro radial inflow turbine, one dimensional model for turbine performance has been established with only hub heat transfer due to the structure feature of the micro gas turbine. Then a numeral simulation has been carried out to verify the model as well as to analyze the flow feature of the turbine. Results show that the model is accurate enough to be used to evaluate the effects of heat transfer on the turbine performance. Due to heat transfer, the relative flow angle at the rotor inlet is increased and the flow state in the whole rotor passage is changed. Meanwhile, the output power and efficiency of the micro turbine decrease obviously.