Study of flow induced by nonuniform lateral injection

The cold flowfield in a closed-end 90 m-porosity porous-walled two-dimensional duct at nonuniform lateral injection condition (approximately exponential distribution) has been investigated, using both laser-Doppler velocimetry measurements and theoretical analysis. The measured and predicted similar velocity profiles are in reasonable agreement, and the conditions for the existence of similarity are identified. A comparison with the previous case of uniform wall injection has also been made. The comparison includes the transition process of the mean-velocity profile, the shift of peak turbulence intensity, the evolution of relative turbulence intensity with axial distance, and the sensitivity of the local heat transfer or erosive burning rate to the relative injection ratio.