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The effect of swirl on the annular flow past an axisymmetric poppet valve

Nadarajah, S; Balabani, S; Tindal, MJ; Yianneskis, M; (1998) The effect of swirl on the annular flow past an axisymmetric poppet valve. P I MECH ENG C-J MEC , 212 (6) 473 - 484.

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Abstract

This paper describes an experimental investigation of the swirling Bow through an axisymmetric port and poppet valve assembly under steady flow conditions. This work is an extension of the preceding paper, which is a study of the non-swirling flow in the same flow configuration [1]. Three different swirl rates were investigated with the aim to study the effects of swirl on the mean Bow and turbulence characteristics of the flow field. The flow structure was studied by means of laser sheet Bow visualization and the three velocity components and the associated Reynolds stresses were measured by ensemble-averaged laser Doppler anemometry techniques. The results are compared with those obtained with the non-swirling flow.The addition of the swirl was found to alter the flow structure, particularly below the valve where a new counter-rotating vortex is formed. A toroidal recirculation zone is also formed in the valve passage. The growth and entrainment of the jet emanating from the valve gap increase and its trajectory angle changes. The flow visualization studies showed evidence of precession of the swirl centre and jet flapping. Swirl increases the Reynolds stresses and the turbulence production rate in most regions of the flow.

Type: Article
Title: The effect of swirl on the annular flow past an axisymmetric poppet valve
Keywords: intake port, poppet valve, LDA, swirl, turbulence
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/1301043
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