Diesel spray liquid phase measuring device

The paper presents the results of liquid fuel radial distribution measureme nts of 25 different spray cross-sections at various distances from the inje ction nozzle. The measurements showed that fuel drops, sprayed into the air, evaporated a nd the spray diameter increased. The calculation of evaporated fuel quantit y was based on the volume of injected fuel and the amount of liquid fuel me asured in each spray cross-section. For the purpose of measuring the liquid fuel in a spray we developed a device using ring electrodes to measure ele ctric charge of the fuel, resulting from fuel rubbing against the injection nozzle metal parts and the measuring device electrodes. The electric charg e was then led to a charge amplifier. where it was converted into electric current. Numerous tests proved good linearity and reliability of the measur ing method. (C) 2001 Elsevier Science B.V. All rights reserved.