By A L Kuhl; et al

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This plate is water-cooled to keep the surface temperature at 60°C. The coordinate y is defined as the downstream direction from the stagnation point. The bulk stretch rate (L/o/L) is varied from 35 to 70 s"1, where UQ is the mean velocity of the mixture at the nozzle exit. Four perforated plates, referred to as P1 to P4, are used as turbulence generators. P0 indicates that no perforated plate is used, and a laminar stagnation point flow is formed. 0 m/s, where flc0=^'0/0/v0 is the turbulent Reynolds number, u'Q is the turbulence intensity at the nozzle exit, Z0 is the integral scale, and v0 is the kinematic viscosity of air at room temperature, u '0 and Z0 have been measured by a hot wire Then Out WHer-cooted Wbl Straight Tube Thermocouple Co-flow Converging Nozzle Settling Chamber Damping Screen Explosion Hatch D'rffuser Mixture Fig.

0 mm). Figure 2 shows the arrangement of the laser tomography optical system. The light source was a 4-W Ar-Ion laser. 4 mm thick in the test section. Silicone oil droplets with diameters of less than 2 /zm were added to the unburnt mixture. Since silicone oil droplets were vaporized within the flame zone, the Mie scattering image due to silicone oil droplets showed the flame front shape. 125 ms (1/8000 s). Figure 3 shows a typical tomographic picture of the flame. By fitting circles of different diameters, the flame curvature at the stagnation streamline was CHARACTERISTICS OF TURBULENT PREMIXED FLAME Stagnation Plate •j Condenser Lens Beam Output Nozzle Cylindrical Lens «M3f^W / \ t / / A \ \ I Optical Fiber Co-flow Mixture Laser Beam Beam Input Fig.

24 T. SCARINCI ET AL. , "Taylor Instability in Shock Acceleration of Compressible Fluids," Communications on Pure and Applied Mathematics, vol. 13, 1960, pp. 297-334. , "Mechanism of Generation of Pressure Waves at Flame Fronts", Technical note 3683, National Advisory Comittee for Aeronautics. Flame Curvature and Flame Speed of a Turbulent Premixed Flame in a Stagnation Point Flow Yuji Yahagi,* Toshihisa Ueda,t and Masahiko Mizomoto$ Keio University, Yokohama, Kanagawa, Japan Abstract A flame curvature and a turbulent flame speed of lean propane/air premixed flames formed in a stagnation point flow were measured with both the Mie scattering with oil droplet (MSOD) method and the laser Doppler velocimetry (LDV) method.

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