We developed an experimental single stage turbine for demonstration of an internal hydrogen reheat gas turbine, in which hydrogen is discharged from the trailing edges of the nozzle vanes into the turbine passage to reheat the working gas. A series of experiments with this turbine were carried out and the results showed the possibility of its realization. Almost complete combustion efficiencies of the hydrogen for the internal reheat are achieved in a wide range of hydrogen bleeding rate. The' increments in the output power by the internal reheat indicate 30% to 70% of those by a onedimensional turbine performance analysis. The reheat does not affect the amount of NOx in exhaust gas in the experiment at temperature of 1240K, but the ratio of NO to NOx is diminished by the reheat process and its tendency has a correlation with the concentrations of the unburned hydrogen gases in the exhaust gas, After the operation with reheat by hydrogen for eleven and a half hours in total, considerable problems associated with the internal reheat are not observed in the turbine structures.
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