Recently, there are many environmental problems caused from NOx, SOx and CO 2 exhausted by combustion. Also, advanced aircraft propulsion systems are required to have higher power, lighter weight and lower emissions. Considering these backgrounds, we have proposed a new cycle concept for hydrogen-fueled propulsion system.The objective of present study is to clarify the 3-dimensional flow field with hydrogen-fueled combustion within a turbine blade passage and the influence of 3-dimensional structures on combustion and mixing processes.Reynolds-averaged compressible Navier-Stokes equations are solved with incorporating a k -s turbulence and a reduced chemical mechanism models. Using the computational results, the 3-dimensional turbulent flow field with chemical reactions is visualized. Also we confirm that 3-dimensional vortical flow structures enhance the turbulent mixing and combustion remarkably.
For the next-generation aircraft, a new propulsion system using hydrogen fuel has been proposed. In the present system, hydrogen fuel injected from a stator surface combusts in the turbine passages, accordingly, the conventional combustor can be cut out. The advantage of this system is that we can design a lighter and smaller engine with low emission. We have demonstrated the realizability of this system by using the cycle analysis and the numerical simulations. Through the previous studies, it was confirmed that the rotor/stator interaction has to be investigated, because the hydrogen combustion phenomena within the stator passage is so complex, and thus it would highly affect the rotor performance. In this paper, we focus on the rotor/stator interaction for the detailed investigation of realizability of this system. The 2- and 3-dimensional numerical simulations are performed for a single stage turbine with hydrogen-fuelled combustion. In the 2-dimensional study, the effects of the injection position and injection rate on the flow structure, the static temperature over the blades, and the blade performance are investigated. Furthermore, 3-dimensional numerical simulation is performed. The general aspect of 3-dimensional flow field is demonstrated, and the effect of hydrogen combustion on the components of turbine, for example hub, tip and blade, are investigated.
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