Abstract
The axial and transverse mean velocity and turbulence intensity components as well as Reynolds stresses and turbulent kinetic energy were measured by using a four-beam two-color laser-Doppler velocimetry (LDV) system for the isothermal flowfield of a simulated combustor that consisted of a plexiglass rectangular duct with two opposing 90° side inlets and one axial inlet. The Reynolds number, based on the air density, combustor height, and bulk mean velocity, was 4.56 × 10 4. The ratio of the axial-inlet to side-inlet jet momentum was 1.28. Various flow regions are characterized by the measured mean flow pattern. The LDV-measured mean reattachment length of the separating bubble compares fairly well with the corresponding flow visualization photograph. Moreover, the lengths needed to reach both unidirectional flow and fully developed mean flow are determined. Regions where turbulence is anisotropic and where turbulent kinetic energy and shear stresses dominate are also identified. The information presented will be useful in testing and developing combustor models in this area.
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