Accession Number : ADP008930

Title :   Velocity Characteristics of Dividing Flow in a T-Junction,

Corporate Author : KING'S COLL LONDON (UNITED KINGDOM)

Personal Author(s) : Fu, H. ; Watkins, A. P. ; Tindal, M. J. ; Yianneskis, M.

Report Date : 23 JUL 1992

Pagination or Media Count : 6

Abstract : This paper presents in experimental investigation of the flows in a T-junction from a model of an internal combustion engine manifold. The flow patterns though the main duct and one branch of the manifold were measured using laser-Doppler anemometry. Detailed measurements of the mean velocity components and corresponding turbulence levels were obtained in order to characterize the flow and provide benchmark data appropriate for the development and assessment of the CFD calculations accompanying the experiments. The flow configuration consisted of a square duct with four branches. For the work presented here three of the branches were blocked, so the geometry corresponded to a T-junction with a main duct/side branch area ratio of 2.87. The results show that with a main duct/branch flow split ratio of 7.8:1 the flow is uniform until 30 mm upstream of the junction and an elongated recirculation region is formed in the side branch. Both the width and length of this region decreased with decreasing flow split ratio. (Author)

Descriptors :   *FLOW FIELDS, MANIFOLDS(ENGINES), LASER ANEMOMETERS, DOPPLER EFFECT, TURBULENCE, COMPUTATIONAL FLUID DYNAMICS, INLETS, INTERNAL COMBUSTION ENGINES, GREAT BRITAIN.

Subject Categories : Fluid Mechanics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE