The Oxford Cold Driven Shock Tube (CDST) for Fuel Spray and Chemical Kinetics Research

Paper #:
  • 2018-01-0222

Published:
  • 2018-04-03
Abstract:
A new reflected shock tube facility, the Cold Driven Shock Tube (CDST), has been designed, built and commissioned at the University of Oxford, specifically for high temperature, high pressure fuel spray and chemical kinetics research. From cold, quiescent conditions, the initiation of a shock wave propagating towards one end of the tube, and reflecting from the sealed end, creates a nominally quiescent high temperature, high pressure slug of gas, inside which may contain pre-mixed fuel vapour for auto-ignition studies or into which liquid fuel may be injected for fuel spray studies. The facility has been created as part of the ‘Ultra Efficient Engines and Fuels’ collaborative project, funded by the EPSRC in the UK. It is anticipated that these experiments will support fundamental research for future IC engine and fuel technologies, which will demand ever higher thermal efficiency and ever lower harmful emissions. To this end, the CDST is shown to be able to provide repeatable test conditions that will allow the delivery of high quality validation data for advanced models. This paper describes the scope of the facility’s capabilities, aspects of its design and commissioning, details of the instrumentation, analysis of the shock propagation and calculation of the test temperature, and sample high speed images from initial experiments based around an axially mounted single hole diesel injector, as used in the Engine Combustion Network (ECN) Spray A diesel injection experiment.
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