Flow characteristics in a large area ratio curved diffuser (AR = 3.4, Δβ = 90°, AS = 0.685) have been experimentally evaluated with splitter vanes installed at different angles to the flow at the inlet of the diffuser. The splitter vanes deflect the flow towards the convex wall and simultaneously increase the turbulence intensity. A marked improvement in flow distribution inside the diffuser and a significant increase in the static pressure recovery coefficient are obtained with splitter vanes at a 10° angle.
FoxR. W.KlineS. J.Flow regimes in curved subsonic diffusers. Trans. ASME, J. Basic Engng, 1962, 84, 303–316.
2.
SagiC. J.JohnstonJ. P.The design and performance of two-dimensional, curved diffusers. Trans. ASME, J. Basic Engng, 1967, 89, 715–731.
3.
ParsonD. J.HillP. G.Effect of curvature on two-dimensional diffuser flow. Trans. ASME, J. Fluids Engng, 1973, 95, 1–12.
4.
StanitzJ. D.Design of two-dimensional channels with prescribed velocity distributions along the channel walls. NACA report 1115, 1953.
5.
FribergJ.DormoyA.Performance prediction for a curved diffuser. Soc. ALSTHOM, Atl, Entropie, 1978, 14, 21–28.
6.
McMillanO. J.Mean-flow measurements of the flow field diffusing bend. NASA contractor report 3634, 1982.
7.
SajanikarM. B.KarS.PowleU. S.Experimental investigation of incompressible flow in curved diffusers. Proceedings of Eleventh National Conference on Fluid mechanics and fluid power, Hyderabad, India, December 1982.
8.
SulleryR. K.ChandraB.MuralidharV.Performance comparison of straight and curved diffusers. Defence Sci. J., 1983, 33, 195–203.
9.
RojasJ.WhitelawJ. H.YianneskisM.Flow in sigmoid diffusers of moderate curvature. Department of Mechanical Engineering report FS/83/21, Imperial College of Science and Technology, London, 1983.
10.
MajumdarB.MohanR.SinghS. N.AgrawalD. P.Experimental study of flow in a high aspect ratio 90° curved diffuser. Trans. ASME, J. Fluids Engng, 1994 (submitted).
11.
MillerD. W.Internal flows. BHRA report, 1976.
12.
AgrawalD. P.SinghS. N.Flow characteristics in a large area ratio curved diffuser. Proceedings of Eighteenth National Conference on Fluid mechanics and fluid power, Indore, India, December 1991.
13.
MajumdarB.SinghS. N.AgrawalD. P.Mean flow measurement in a large area ratio curved diffuser. Proceedings of Nineteenth National Conference on Fluid mechanics and fluid power, Bombay, India, December 1992.
14.
CochranD. L.KlineS. J.Use of short flat vanes for producing wide-angled two-dimensional subsonic diffusers. NACA TN 4309, 1958.
15.
MooreC. A.KlineS. J.Some effects of vanes and of turbulence on two-dimensional wide angled subsonic diffusers. NACA TN 4309, 1958.
16.
AwaiT.NakagawaT.SakaiT.A study on the axially curved mixed-flow vaneless diffusers. Bull. Jap. Soc. Mech. Engrs, 1986, 29, 1759–1764.
17.
MajumdarB.SinghS. N.AgrawalD. P.Effectiveness of deflector plates in improving the performance of large area ratio curved diffuser. Proceedings of Twentieth National Conference on Fluid mechanics and fluid power, Palghat, India, December 1993.
18.
CarlsonJ. J.JohnstonJ. P.SagiC. J.Effect of wall shape on flow regimes and performance in straight, two-dimensional diffusers. Trans. ASME, J. Basic Engng, 1967, 89, 151–160.
19.
EnayetM. M.GibsonM. M.TaylorA. M. K. P.YianneskisM.Laser-Doppler measurements of laminar and turbulent flow in a pipe bend. Int. J. Heat and Fluid Flow, 1982, 3(4).
20.
HilleP.VehrenkampR.Schulz-DuboisE. O.The development and structure of primary and secondary flow in a curved square duct. J. Fluid Mechanics, 1985, 151, 219–241.
21.
HumphreyJ. A. C.WhitelawJ. H.YeeG.Turbulence in a square duct with strong curvature. J. Fluid Mechanics, 1981, 103, 443–463.
22.
TaylorA. M. K. P.WhitelawJ. H.YianneskisM.Curved ducts with strong secondary motion: velocity measurements of developing laminar and turbulent flow. Trans. ASME, J. Fluids Engng, 1982, 104, 350–358.
23.
ThangamS.HurN.Laminar secondary flows in curved rectangular ducts. J. Fluid Mechanics, 1990, 217, 421–440.
