The influence of swirl on the shape of the Burke-Schumann reaction sheet in a straight cylindrical pipe is investigated by asymptotic and numerical means. Attention is confined to swirl levels that are near the critical value at which vortex breakdown occurs. A high Reynolds number, laminar, isothermal, low Mach number reacting flow is considered. An asymptotic analysis is developed to study th...

Controlling the flame shape and its liftoff height is one of main issues for oxy-flames to limit heat transfer solid components injector. An extensive experimental study carried out analyze effects co- counter-swirl on flow patterns non-premixed stabilized above a coaxial injector when both inner fuel annular oxidizer streams are swirled. A swirl level greater than 0.6 in stream shown yield com...

The paper presents large eddy simulation of unconfined swirling jets. In the first part, an unconfined annular jet is investigated for swirl numbers ranging from 0 to 1.2. The impact of the swirl on the mean flow and the precessing vortex structures in this flow is analysed. In the second part of the paper, a co-annular pilot jet is introduced near the axis. The investigations show that the add...

Abstract Experiments are carried out on the laboratory-scale MICCA-Spray annular combustor to examine effects of swirlers combustion instabilities. This system comprises 16 spray-swirl injectors and gives rise instabilities coupled by azimuthal modes. Five types producing clockwise rotation varying in swirl numbers pressure drops considered. These can be broadly categorized into two groups: low...

Recent experiments conducted in the Rotor Force Test Facility at the California Institute of Technology have examined the effects of a tip leakage restriction and swirl brakes on the rotordynamic forces due to leakage flows on arl impeller undergoing a prescribed circular whirl. The experiments simulate the leakage flow conditions and geometry of the Alternate Turbopump Design (ATE)) of the Spa...

Hydraulic Pump sumps are designed to provide a swirl free flow to the pump. The degree of swirl is measured in physical model tests using a swirl meter and a quantity known as swirl angle is generally measured. The present paper presents a novel method to compute the bulk swirl angle using the local velocity field obtained from computational fluid dynamics data. The basis for the present method...