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Velocity and turbulence measurements in combustion systems

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Abstract

A laser-Doppler velocimeter is used in the measurement of high-temperature gas flows. A two-stage fluidization particle generator provides magnesium oxide particles to serve as optical scattering centers. The one-dimensional dual-beam system is frequency shifted to permit measurements of velocities up to 300 meters per second and turbulence intensities greater than 100 percent.

Exiting flows from can-type gas turbine combustors and burners with pre-mixed oxy-acetylene flames are described in terms of the velocity, turbulence intensity, and temperature profiles.

The results indicate the influence of the combustion process on turbulence.

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Abbreviations

A :

exit area of combustor or burner (m2)

A/F :

mass air-fuel ratio

D :

exit diameter of combustor or burner (m)

M :

mass flow rate of gases (kg/s)

N D :

number of Doppler bursts used in each velocity measurement

Q :

volumetric flow rate at T r (m3/s)

R :

exit radius of combustor or burner (m)

R 1/2 :

distance from centerline to radius where the velocity is one-half of the local centerline velocity (m)

Re:

exit Reynolds number based on cold flow, ϱQD/μA

r :

distance from centerline of flow (m)

T :

temperature (°C)

T CL :

centerline temperature (°C)

T r :

inlet (cold) air temperature of combustor or burner (°C)

T.I.:

turbulence intensity, \(\sqrt {\overline {u\prime ^2 } /\overline {U_{CL} } } \)

\(\overline U \) :

mean velocity (m/s)

U i :

instantaneous velocity individually realized by LDV (m/s)

\(\overline {U_{CL} } \) :

mean velocity at centerline of flow (m/s)

\(\overline {u\prime ^2 } \) :

mean square velocity fluctuation (m2/s2

x :

distance along centerline downstream of exit (m)

μ:

absolute viscosity at T r (kg/(ms))

ϱ:

density at T r (kg/m3)

References

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Minnesota, III Church Street SE, 55455, Minneapolis, Minn., USA

    R. J. Goldstein

  2. McDonnell Douglas Astronautics Company, P.O. Box 516, 63166, St. Louis, Mo., USA

    K. Y. Lau

  3. Rockwell International Energy Systems Group, 8900 DeSoto Avenue (LB-03), 91304, Canoga Park, Calif., USA

    C. C. Leung

Authors
  1. R. J. Goldstein
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  2. K. Y. Lau
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  3. C. C. Leung
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Goldstein, R.J., Lau, K.Y. & Leung, C.C. Velocity and turbulence measurements in combustion systems. Experiments in Fluids 1, 93–99 (1983). https://doi.org/10.1007/BF00266261

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  • DOI: https://doi.org/10.1007/BF00266261

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