NACA Technical Notes

Report presenting an investigation of fuel injection into a combustion chamber, including theoretical and experimental results regarding the unsteady-state portion of the total vaporization time of single fuel droplets injected into air

Alcohol as a fuel for farm and construction equipment

Work in three areas dealing with the utilization of ethanol as fuel for farm and construction diesels is summarized. The first part is a review of what is known about the retrofitting of diesels for use of ethanol and the combustion problems involved. The second part is a discussion of the work that has been done under the contract on the performance of a single-cylinder, open-chamber diesel using solutions and emulsions of diesel fuel with ethanol. Data taken include performance, emissions and cylinder pressure-time for diesel fuel with zero to forty percent ethanol by volume. Analysis of the data includes calculation of heat release rates using a single zone model. The third part is a discussion of work done retrofitting a multicylinder turbocharged farm tractor diesel to use ethanol by fumigation. Three methods of ethanol introduction are discussed; spraying ethanol upstream and downstream of the compressor and prevaporization of the ethanol. Data on performance and emissions are given for the last two methods. A three zone heat release model is described and results from the model are given. A correlation of the ignition delay using prevaporized ethanol fumigation data is also given. Comparisons are made between fumigation in DI and IDI engines

NACA Technical Notes

Report presenting an investigation with two purposes: to obtain a simplified calculation technique for replacing complicated automatic computer calculations and to obtain experimental data for single droplets vaporizing at pressures greater than 1 atmosphere and to check the histories against experimental data

NACA Technical Notes

Report presenting a comparison of experimental and calculated mass and temperature histories of drops vaporizing with a constant velocity relative to the air. The results indicate that the unsteady state or time required for the drop to reach the wet-bulb temperature is an appreciable portion of the total vaporization time. Results regarding the measurement of surface and center temperature of drops, internal circulation in drops, heat transfer from thermocouple to drop, experimental temperature and mass histories, binary mixtures, and burning drops are provided and compared to theoretical results

NACA Technical Notes

Report presenting the results of an experimental and theoretical investigation of the vaporization of fuel droplets in heated air under atmospheric pressure. An experimental investigation of the temperature and mass histories of single droplets was made, a comparison of the experimental results was conducted with calculated temperature and mass histories, and the time taken by a droplet vaporizing to for a mixture of fuel vapor and air of combustible strength is calculated