Numerical Analysis of Turbulent Flow in a Duct Introducing Two -stage Combustion Air

Tomohiko Furuhata, Hideyuki Aoki, Shoji Tanno, Takatoshi Miura, Shozaburo Saito, Shigemori Ohtani

Research output: Contribution to journalArticlepeer-review


To investigate the change of flow characteristics in a duct caused by introducing two-stage combustion (TSC) air, TSC air (80 Nm3/hr.) was introduced tangentially at an axial position of x/D=0.8 through the circumference of a circular duct (0.5m I.D.×2.0m length) of acrylic resin. Two components (axial and tangential) of the mean velocities at x/D=0.5 and 1.5 were measured using a laser-doppler-anemometer. By combining the κ-ɛ two-equation model with a model developed for TSC air, the flow in the duct was analyzed numerically in cylindrical coordinates to compare the results with the measured turbulent flow quantities. Numerical results agreed well with experimental ones and the model developed for TSC air was thus found to be appropriate. These results did not agree, however, with the results by introducing TSC air through one tube as applied to a practical furnace. Three-dimensional analysis must therefore employed.

Original languageEnglish
Pages (from-to)329-334
Number of pages6
Journalkagaku kogaku ronbunshu
Issue number2
Publication statusPublished - 1990 Jan 1


  • Laser-Doppler-Anemometer
  • Numerical Simulation
  • Turbulent Flow
  • Two-stage Combustion
  • Velocity Distribution
  • κ-ɛ Model

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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