The effect of gravity on turbulent, premixed flame propagation - A preliminary cold flow study

Abstract

Nomenclature x, y, z = axis system (see Fig.3) h = height of channel L = integral scale 77 = Kolmogorov scale fwaa = wall shear stress u' = magnitude of large scale turbulent velocity Uj = i* component of mean velocity U = x component of mean velocity (;'=!) V = y component of mean velocity (/=2) U wa n = U he i, = belt velocity Una = x component of root mean square velocity Vms = y component of root mean square velocity rf u U f +

The effect of gravity on turbulent, premixed flame propagation - A preliminary cold flow study

“…Previously reported data for this facility have proven the velocity flow field to be two dimensional 3 . Therefore, the analysis of subsequent data is performed using centerline profiles.…”

“…As expected, £/""/ has a turbulence peak close to the wall before it reaches a uniform distribution in the core, and V^ gradually increases to a uniform distribution in the core. Most of this information was presented in the reference 3 . The low density fluid tracking test in the Couette flow were carried out at Re h = 10,000.…”

“…To interpret the results from more basic diagnostic techniques, like Schlieren imaging, it is essential to first understand the nonreacting flow field. Velocity and shear distribution in the cold flow field measured by LDV were previously mapped for different flow conditions 3 . The feasibility of carrying out 2D image mapping of a spreading scalar in the flow was tested by injecting acetone at a point into the flow field and visualizing its spread using passive species planar laser induced fluorescence.…”