Combustion of Drops and Sprays of No. 2 Diesel Oil and Its Emulsions with Water and Methanol. Volume I (Experimental)

摘要

This report deals with an investigation directed to understand the combustion behavior of No. 2 diesel oil and its emulsions with water and methanol. This Volume (1) of the report presents the experimental results of the study, whereas Volume II describes the theoretical analysis. The experiments are carried out in three parts: (a) a study of stability and microstructure of emulsions, (b) single drop combustion studies, and (c) spray combustion studies. In the first part, the effects of internal phase concentration, the surfactant concentration, and the time of blending on the stability and microstructure of emulsions are examined. In the second part the effects of emulsion characteristics (internal phase concentration, surfactant concentration, and type of internal phase) and ambient variables (chamber temperature, chamber pressure, chamber oxygen concentration, and preheat temperature of emulsions) on the combustion behavior of unsupported single-isolated drops are studied. In the third part the effects of all the variables examined in part b on the combustion behavior and pollutant emission of sprays are studied. The results show that unsupported drops of No. 2 diesel oil emulsions with water and methanol undergo disruption during combustion and the fragmentation activity depends on emulsion and ambient variables. The ignition and pollutant emission characteristics of No. 2 diesel-oil sprays also are seen to be affected by emulsification.