- Author
- Namer, I. | Talbot, L. | Robben, F.
- Title
- Phase-Locked Velocity and Density Measurements in a C2H4-Air Flame in a Karman Vortex Street.
- Coporate
- Drexel Univ., Philadelphia, PA California Univ., Berkeley
- Report
- WSS/CI 83-25,
- Book or Conf
- Combustion Institute/Western States Section. Spring Meeting, 1983. April 11-12, 1983, Pasadena, CA, 50 p., 1983
- Keywords
- premixed flames | vortex shedding
- Abstract
- The interaction of a premixed C2H4-air flame with a Karman vortex street was studied. Laser Doppler anemometry was used for velocity measurements and Rayleigh scattering was used to measure total gas density. A reference hot-wire was used to enable phase-locked ensemble averaging to be performed on the data. The velocity measurements, for vortex shedding cylinder Reynolds numbers (UD/v) = 73 and 110, indicated that the vortex street and, hence, the flow field upstream of the flame is deflected by the flame. This is due to the pressure drop across the flame which is necessary to accelerate the flow behind the flame. The vortices were not observed behind the flame. The combination of dilatation and increased disipation "consumed" the vortices. A qualtitative comparison was made with numerical calculations by Karasalo and Namer for the time dependent interaction of a flame with an ideal Karman vortex street and suggestions for improving the model were made. Nevertheless, considering the significant differences in details between this experiment and the numerical calculations, the general behavior of the measured and calculated flames was comparable.