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Abstract

This paper describes an experimental investigation of the swirling flow 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 flow and turbulence characteristics of the flow field. The flow structure was studied by means of laser sheet flow 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.

Keywords

intake port poppet valve LDA swirl turbulence

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References

Nadarajah

Balabani

Tindal

M. J.

Yianneskis

The turbulence structure of the annular non-swirling flow past an axisymmetric poppet valve. Proc. Instn Mech. Engrs, Part C, Journal of Mechanical Engineering Science, 1998, 212(C6), 455–471.

Gupta

A. K.

Lilley

D. G.

Syred

Swirl Flows, 1984 (Abacus Press).

Chanaud

R. C.

Observation of oscillatory motion in certain swirling flows. J. Fluid Mechanics, 1965, 21(1), 111–127.

R. M. C.

Ahmed

S. A.

Mongia

H. C.

Jet characteristics in confined swirling flow. Exp. in Fluids, 1985, 3(4), 221–230.

Wessman

Klingmann

Noren

Experimental studies of confined turbulent swirling flows. In Proceedings of 7th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 11–14 July) 1994, Vol. 1, pp. 19.3.1–19.3.7.

Claypole

T. C.

Evans

Hodge

Syred

The influence of the precessing vortex core on velocity measurements in swirling flows. In Proceedings of 3rd International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 7–9 July) 1986, pp. 11.5.1–11.5.8.

Fick

Griffiths

A. J.

O'Doherty

Visualisation of coherent structures in a highly turbulent swirling flame. In Proceedings of 8th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, 8–11 July) 1996, Vol. I, pp. 10.4.1–10.4.7.

Morse

A. P.

Whitelaw

J. H.

Yianneskis

The influence of swirl on the flow characteristics of a reciprocating piston—cylinder assembly. Trans. ASME, J. Fluids Engng, 1980, 102, 478–480.

Arcoumanis

Hadjiapostolou

Whitelaw

J. H.

Swirl centre precession in engine flows. SAE paper 870370, 1987.

10.

Nadarajah

Tindal

M. J.

Yianneskis

Swirl centre precession under steady flow conditions. In Proceedings of IMechE Conference,) 1991, paper C413/065, pp. 103–108.

11.

Beer

J. M.

Chigier

N. A.

Combustion Aerodynamics, 1972 (Applied Science Publishers).

12.

Rodi

Basic equations for turbulent flow in Cartesian and cylindrical co-ordinates. Mechanical Engineering Department, Imperial College, Internal Report BL/TN/A/36, 1970.

13.

Taylor

A. M. K. P.

Whitelaw

J. H.

Velocity characteristics in the turbulent near wakes of confined axisymmetric bluff bodies. J. Fluid Mechanics, 1984, 139, 391–416.

14.

Gosman

A. D.

Flow processes in cylinders. In The Thermodynamics and Gas Dynamics of Internal-Combustion Engines (Eds Horlock

J. H.

Winterbone

D. E.

), 1986, Vol. 2, Ch. 11 (Clarendon Press, Oxford).

15.

Nadarajah

Experimental investigation of flow patterns through inlet ports and valves. PhD thesis, King's College London, University of London, 1992.

16.

Vafidis

Aerodynamics of reciprocating engines. PhD thesis, Imperial College, University of London, 1985.

17.

Coghe

Brunello

Tassi

Effects of intake ports on the in-cylinder air motion under steady flow conditions. SAE paper 880384, 1988.

18.

Hommersom

Evers

D. J. W. M.

Huigen

Swirl generation by a directed inlet port of diesel automotive engine under steady flow conditions. In Proceedings of 3rd International Conference on Laser Anemometry: Advances and Applications, University College of Swansea, 26–29 September) 1989, pp. 23.1–23.15.

19.

Heitor

M. V.

Taylor

A. M. K. P.

Whitelaw

J. H.

The interaction of turbulence and pressure gradient in a baffle-stabilised premixed flame. J. Fluid Mechanics, 1987, 181, 387–413.

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

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