Accession Number : ADP008942

Title :   Application of Refractive Index Matching to a Diesel Nozzle Internal Flow,

Corporate Author : IMPERIAL COLL OF SCIENCE TECHNOLOGY AND MEDICINE LONDON (UNITED KINGDOM) DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Arcoumanis, C. ; Nouri, J. M. ; Andrews, R. J.

Report Date : 23 JUL 1992

Pagination or Media Count : 7

Abstract : An enlarged acrylic model of a production diesel fuel injection nozzle was incorporated into a steady flow rig to allow flow velocity measurements to be obtained by laser Doppler velocimetry in critical areas of the nozzle. Optical access into the complicated, internal flow passages was achieved by using, instead of gas oil, a mixture of hydrocarbon fuels which at a given mixture ratio, temperature and laser wavelength match the refractive index of the acrylic nozzle body. This matching has made possible the quantitative characterisation of the nozzle internal flow, in terms of spatially-resolved, three-dimensional mean velocity and turbulent components, and the validation of computer models aiming to predict the flow and cavitation in fuel injection systems. (Author)

Descriptors :   *FUEL INJECTORS, *FLOW FIELDS, *LASER VELOCIMETERS, DOPPLER EFFECT, MODEL TESTS, DIESEL ENGINES, FLOW VISUALIZATION, ACRYLIC RESINS, CAVITATION, COMPUTER PROGRAM VERIFICATION, COMPUTERIZED SIMULATION, GREAT BRITAIN.

Subject Categories : Reciprocating and Rotating Engines
      Fluid Mechanics
      Optical Detection and Detectors
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE