A pulsed radiography technique for studying the internal structure of fuel injection jets

The paper deals with the development and design of a portable X-ray apparatus and its application to studies of the internal structure of fuel jets injected from a diesel nozzle. The cumulative nature of the interaction between the jet head and the medium is demonstrated, along with the regular formation of liquid condensations in the body of the jet, the number of which in these cross sections exceeds by an order of magnitude their number in the rarefied portions of the jet. This phenomenon, observed only during the stage of increasing pressure in the fuel system, is attributed to the onset of hydrodynamic instability in jets with a positive longitudinal velocity gradient.