Accession Number : AD0437523


Title :   INVESTIGATION OF THE EFFECT OF COMPRESSION TEMPERATURE ON COMBUSTION IN A DIESEL ENGINE USING AN ATKINSON CYCLE. PART I. TESTS ON A TANGYE VCP1 ENGINE,


Corporate Author : BRITISH INTERNAL COMBUSTION ENGINE RESEARCH ASSOCIATION LTD SLOUGH (ENGLAND)


Personal Author(s) : Tryhorn,D W


Report Date : 27 Nov 1963


Pagination or Media Count : 18


Abstract : A Tangye VCP1 engine was tested under high pressure, variable temperature charge conditions using both early and late inlet valve closing points to reduce the effective compression ratio. It was thus possible to obtain performance data over a range of compression temperatures lower than is feasible with a normal cycle. The results serve to show the effect of compression temperature on an engine with a high swirl, single-hole nozzle, combustion system. The theoretical gains expected from use of the 'modified Atkinson cycle' were, however, not substantiated by the results. This was traced to the excessive values of the charge heating effects associated with the throttling losses which inevitably result from closing the inlet valve while the piston is in mid-stroke. The consequence was that the compression temperature was never low enough to have a really marked effect on combustion but, at the lowest temperature reached, there was some deterioration in performance attributable to an over-cool charge. (Author)


Descriptors :   *DIESEL ENGINES , TEMPERATURE , COMPRESSIVE PROPERTIES , COMBUSTION , THERMODYNAMICS , INTAKE VALVES , TIMING DEVICES , UNITED KINGDOM , PRESSURE , FUEL CONSUMPTION , VALVES , IGNITION LAG , THERMODYNAMIC CYCLES , HYPERBARIC CONDITIONS , SCIENTIFIC RESEARCH


Distribution Statement : APPROVED FOR PUBLIC RELEASE