Abstract
Keywords: hydrogen, combustion engine, heat transfer, measurement methods, convection coefficient
Hydrogen-fuelled internal combustion engines are attractive as they offer the potential of near-zero emissions, high efficiency, and zero greenhouse gas emissions. Computer simulation of the performance of such engines would enable a cheap and fast optimization of engine settings for operation on hydrogen. A model for the heat transfer between cylinder gases and combustion chamber walls is necessary for such a simulation and would improve the simulation program written by Verhelst [1]. A review of the literature shows that very few data is available on the heat transfer inside a hydrogen combustion engine. It can be expected that the heat transfer in hydrogen engines differs substantially from e.g. gasoline engines, because of the higher flame speeds and lower quenching distance. In this paper several measurement methods were investigated and compared to each other for mounting in a CFR engine. Two instantaneous heat flux sensors were chosen and installed on a calibration test rig. Initial results are discussed, determining the rise time of the sensors.