Experimental investigation of ram accelerator flow fields and combustion kinetics

  • M. R. Kamel
  • C. I. Morris
  • A. Ben-Yakar
  • E. L. Petersen
  • R. K. Hanson
Conference paper

Abstract

Ram accelerator-related research at Stanford in the areas of hypersonic reactive flows and high-pressure combustion kinetics is presented. Research on reactive flows includes investigation of the combustion modes observed in hypersonic reactive flows over blunt cylinders and 2D bodies. In the experiments reported herein, simultaneous OH PLIF and schlieren imaging experiments of hypersonic reactive flow fields around spherical-nosed and flat-faced cylinders, 19 and 25 mm in diameter, have been performed. Stagnation pressure histories were recorded using a pressure transducer embedded in the cylinders. Methane-, ethylene-, and hydrogen-based fuel-oxidizer mixtures were used at different free stream conditions. Three different combustion modes were observed as flow velocity was varied relative to the Chapman-Jouget speed, consistent with previous work. These experiments represent the first time pressure disturbances in the unsteady combustion modes have been directly measured. Gas-phase combustion kinetics research involves the use of a high-pressure shock tube facility for ignition delay time measurements and detailed kinetics modeling for ram accelerator mixtures and conditions. Ignition time measurements are presented, and a detailed kinetics mechanism developed to model CH4/O2 ram accelerator ignition is reviewed.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • M. R. Kamel
    • 1
  • C. I. Morris
    • 1
  • A. Ben-Yakar
    • 1
  • E. L. Petersen
    • 1
  • R. K. Hanson
    • 1
  1. 1.High Temperature Gasdynamics Laboratory Stanford UniversityUSA

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