F2008-SC-037 EXPERIMENTAL RESEARCH ON THE HEAT TRANSFER INSIDE A HYDROGEN COMBUSTION ENGINE: EVALUATION AND CON- STRUCTION OF MEASUREMENT METHODS

tion coefficient ABSTRACT- Hydrogen-fuelled internal combustion engines are attractive as they offer the potential of near-zero emissions, high efficiency, and zero greenhouse gas emissions. Com-puter simulation of the performance of such engines would enable a cheap and fast optimiza-tion of engine settings for operation on hydrogen. A model for the heat transfer between cyl-inder gases and combustion chamber walls is necessary for such a simulation and would im-prove 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 en-gines, 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