Abstract
Abstract Earlier work on the turbulent diffusion flame of a hydrogen jet issuing into a co-flowing air stream has been extended to include the effects of axial pressure gradients. Pressure gradients with parameters of − 1.1 × 10−3, — 0.41 × 10−3 and +0.09 × 10−3 were produced by converging and diverging the floor and roof of the working section. Laser-Doppler anemometer (LDA) measurements including mean velocities, turbulence intensities and Reynolds stress were made with only the jet seeded so that the measurements are of a turbulent zone average nature. Both favourable (negative) and adverse pressure gradients shorten the flame. A flame of elliptical cross-section was produced but the distortion is fully accounted for by the free stream strain and the results are presented in pseudo-axisymmetric form. For favourable pressure gradient, the mean velocity profiles in the radial direction are closely similar to those found earlier for near-zero pressure gradient. For the adverse pressure gradient, the mean ...
Published Version
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