Abstract
Development of a micro-scale gas turbine is underway at Tohoku University and Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI). The gas turbine has a centrifugal compressor and a centrifugal turbine of diameter 10mm. The impellers have fully 3-dimensional geometry machined by micro 5-axis end-mill. The objective of developing the gas turbine at micro scale is to confirm the maximum possible performance of gas turbines at micro-scale. The development of the gas turbine has been split into two, (1) development of a micro turbocharger to realize the design rotational speed of 870000 rpm, and (2) development of a micro combustor to achieve a stable self-sustaining combustion at micro scale, with an appropriate heat shielding method. The mechanical design of the micro-turbocharger has been completed, and the micro-turbocharger has been manufactured. A micro combustor has been developed and tested. Self-sustained combustion has been achieved, with both hydrogen and methane fuel. Hundred percent of combustion efficiency has been achieved with hydrogen fuel.
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