Abstract
Experimental and theoretical studies are reported on a turbulent flow in a side-inlet rectangular combustor with an aspect ratio of 4:1. A laser-Doppler velocimeter was used to measure the axial and transverse mean velocity and turbulence intensity components as well as Reynolds stress and turbulent kinetic energy. The Reynolds numbers based on the air density, combustor hydraulic diameter, and bulk velocity were in the range of 1.0 X IO to 2.0 x IO. The governing partial differential equations were solved numerically with the twoequation k-e turbulence model. Reasonable agreement is demonstrated between the measured and calculated mean-velocity profiles. Flow oscillations are determined from the measured velocity probability density functions. Regions where turbulence is anisotropic and where turbulent kinetic energy and shear stresses dominate are identified. In addition, the effects of the dome height on the impinging stagnation point, the reattachment lengths, and the fractions of the inlet mass flow rate transported into the dome recirculation region and the secondary recirculation regions, respectively, are investigated. Furthermore, the variation of the reattachment length with the Reynolds number and the spanwise flow distribution presented in this study are believed to be a useful test of the combustor modeling.
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