Accession Number : ADP009006

Title :   Conditional and Frequency Analyses of LDV Signals from a Gas-Fuelled Engine,

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

Personal Author(s) : Vafidis, C. ; Whitelaw, J. H. ; Xu, H. M.

Report Date : 23 JUL 1992

Pagination or Media Count : 4

Abstract : Measurements of gas velocity have been obtained in a firing gas-fuelled engine by laser-Doppler velocimetry as a function of crank angle and correlated with pressure and the signals from ionisation gauges. The engines was operated at 1000 rpm with part load and with sequences of five firing and nine non-firing cycles so that it was possible to examine the cyclic variability associated with nonfiring, rich and lean burn. The results show smaller variability than did previous results with liquid fuel that lean burn is associated with large variability than is stoichiometric burning and that the flame front is associated with increases in fluctuation levels which remain to be explained (Author)

Descriptors :   *LASER VELOCIMETERS, *SPARK IGNITION ENGINES, DOPPLER EFFECT, FLOW FIELDS, CYCLES, GREAT BRITAIN.

Subject Categories : Reciprocating and Rotating Engines
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE