Title page for ETD etd-08222009-040351

Type of Document Master's Thesis
Author Long, Scott R.
URN etd-08222009-040351
Title Experimental determination of strain rates in stretched laminar diffusion flames
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Dancey, Clinton L. Committee Chair
Brown, Eugene F. Committee Member
  • Flame visualization
Date of Defense 1992-09-05
Availability restricted

A laser Doppler anemometer was used to measure the axial and radial velocity components of hydrogen-air counterflow diffusion flames (CFDF). An axisymmetric opposed jet burner (OJB) used seeded air in one cylindrical tube, and a hydrogen-nitrogen mixture in the opposing cylindrical tube. Velocity measurements were made at four different operating flow rates, and were used to compute the associated strain rate fields. The results were used to qualitatively assess current CFDF modeling schemes, and to expand the knowledge of the fluid velocity field behavior within these flames.

The data show behavior qualitatively consistent with most models and experimental studies: the radial velocity is essentially linear with radial position, and the velocity data collapse to functions of axial position only for regions away from the stagnation plane. However, the data also show a variable strain rate field and a relatively thick reaction zone, which are both inconsistent with CFDF models. The axial velocity fields also behaved unexpectedly as the operating flow rates were increased, transitioning from the characteristic N -shaped profile to an asymptotically-approaching profile.

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