Combustion Characteristics of Electrolytically Produced Hydrogen-Oxygen Mixtures 971703
The paper reports and evaluates the combustion pressures of electrolytically produced stoichiometric hydrogen-oxygen mixtures, spark-ignited inside a variable height (volume 0-250cc) ceramic piston cylinder arrangement. Ignition of mixtures was carried out at room temperature and absolute pressures varying between 5 and 180 kPa.
Maximum combustion pressures were obtained from pressure-time traces and compared to a computer simulation model based on the first law of thermodynamics, ideal gas law and high temperature dissociation of combustion products. Ignition delay time and rate of pressure rise are also investigated.
The results are to be used in a preliminary design of a combustion chamber of a hydrogen-oxygen fuelled engine.
It was found that maximum combustion pressures are dependent on initial mixture pressure, initial water vapour content and surface area/volume ratio of combustion chamber.
The average rate of pressure rise (dP/dT) is independent of chamber height but is a function of initial mixture pressure
Ignition delay time is found to be a function of initial mixture pressure and decreases exponentially from a maximum value of 2.2 ms to 0.3 ms as the precombustion pressure of the mixture is increased.
Citation: Bohacik, T., De Maria, S., Trowbridge, C., and Saman, W., "Combustion Characteristics of Electrolytically Produced Hydrogen-Oxygen Mixtures," SAE Technical Paper 971703, 1997, https://doi.org/10.4271/971703. Download Citation
Tomas Bohacik, Sam De Maria, Chris Trowbridge, Wasim Saman
University of South Australia
International Spring Fuels & Lubricants Meeting & Exposition
Combustion Processes in Engines Utilizing Gaseous Fuels-SP-1278, SAE 1997 Transactions - Journal of Fuels and Lubricants-V106-4