Computational Investigation of Flow Development Through 22.5°/22.5° Sigmoid Diffuser
In the present investigation the distribution of mean velocity, turbulence intensity, static pressure and total pressure are experimentally studied on a Sigmoid Diffuser of 22.5°/22.5 angle of turn with an area ratio of 1.5 aspect ratio 3.75 keeping inlet width 50 mm with centre line length 450 mm. The experimental results then were numerically validated with the help of Fluent. The velocity distribution shows that generation of secondary motion in the form of counter rotating vortices within the 1st half of the diffuser. The secondary motion changes their sence of rotation after the inflexion plane of the test diffuser. The maximum values of the mass average static Pressure recovery and total pressure loss are 38% and 12% compared to the predicted results of 41% and 9% respectively, which shows a good agreement between the experimental and predicted results.
Copyright © 2014 Praise Worthy Prize - All rights reserved.
J.D. Stanitz, Design of Two Dimensional Channels with Prescribed Velocity Distribution along the Channel Walls, NACA Report , No. 115, 1953
R.W. Fox, and S.J. Kline, Flow Regimes in Curves Subsonic Diffuser, Trans ASME, Journal of Basic Engineering, Vol. 84, 1962, pp. 303 – 316.
O. J.Mcmillan, Mean Flow Measurements of the Flow Diffusing Bend, NASA Contractor Report 3634, 1982.
J. Seddon, Understanding and Countering the Swirl in S- ducts; Test on the Sensitivity of swirl to Fences, Aeronautical journal, 1984, pp. 117-127.
A. D. Vakili, J.M. Wu, P. Liver, and M.K. Bhat, Experimental Investigation of Secondary Flow in a Diffusing S- Duct, University of Tennessee Space Inst, Report No. TRUTSI 86/14, University of Tennessee, Tullahoma, TN. 1984.
M .I. Yaras, Effects of inlets conditions n the flow in a Fishtail Diffuser with strong Curvature, Trans ASME, Journal of Fluid Engineering, Vol. 118, 1996, pp 772 – 778.
B.A. Reichert and B.J. Wendt, Improving Curved Subsonic Diffuser Performance with Vortex Generator, AIAA Journal, Vol.14, 1996, pp. 65 – 72.
B. Majumdar, S.N. Singh, and D.P. Agrawal, Flow Characteristics in S-shaped Diffusing Duct, In Journal of Turbo and Heat Engines, Vol. 14, 1997, pp 45 – 57.
T. Sonada, T. Arima, and M.Oana, The influence of Downstream Passage on the Flow within an Annular S-shaped Ducts, Trans ASME, Journal of Turbo Machinery, Vol. 120, 1998, pp. 714 – 722.
A. N. Mullick, and B. Majumdar, Experimental Investigation of flow Parameters in a Mild Curves S-shaped Diffusing Duct, Journal of Aerospace Science and Technologies, Vol. 58, No. 1, 2006, pp. 22 – 30.
R.G. Dominy, D.A. Kirkham, and A.D. Smith, Flow Development through Inter turbine Diffuser, Trans ASME, Vol. 120, 1998, pp. 298 – 304.
S. Fuji, and T. H. Okiishi, Curved Diffusing Annulus Turbulent Boundary-Layer Development, Authors’ Report. No.ISU-ERI-Ames-71033, National Technical Information Service, Springfield, Va., 22151.as N72-10239, 1997.
J.L. Xia, B.l. Smith, T. Zierer, J. Schmidli, and G. Yadigaroglu, Study of Turbulent flow Characteristics in a 180° bend Annular Diffuser with Blow off, Int. comm. Heat Mass Transfer, Vol. 26, 1999,pp. 685 – 694.
S. N. Singh, V. Seshadri,, K. Saha, K.K. Vempati and S. Bharani, Effect of inlet swirl on the performance of annular diffusers having the same equivalent cone angle, Proc. Inst.Mech. Engineer, Part G, Journal of Aerospace Engineering, Vol. 220, No.2, 2006, pp.129-143.
P. K. Sinha, A. N. Mullick, B. Halder, B. Majumdar, A Parametric Investigation of flow through an Annular Curved Diffuser, (2010) International Review of Aerospace Engineering (IREASE), 3 (5), pp. 249-256.
A. C. Benim, F. Gul, E. Pasqualotto, Loss Correlations for Developing Turbulent Pipe Flow, (2007) International Review of Mechanical Engineering (IREME), 1 (1), pp. 18-24.
Kahrom, M., Shokrgozar, A., Evaluation of turbulence models in predicting turbulence penetration into low reynolds number regions, (2010) International Review of Mechanical Engineering (IREME), 4 (1), pp. 51-59.
Sinha, P.K., Biswas, A.K., Majumdar, B., Computational analysis of flow structure in a curved subsonic diffusing duct, (2013) International Review of Mechanical Engineering (IREME), 7 (4), pp. 734-739.
A. K. Biswas, Prasanta K. Sinha, A. N. Mullick, B. Majumdar, A Computational Analysis of Flow Development Through a Constant Area S-Duct, (2013) International Review of Aerospace Engineering (IREASE), 6 (3), pp. 145-152.
Elsafty, A.F., Abo Elazm, M.M., Improving air quality in enclosed parking facilities using ventilation system design with the aid of CFD simulation, (2009) International Review of Mechanical Engineering (IREME), 3 (6), pp. 796-807.
Ahmed, A.M., Ahmad, M., Rahim, A., Numerical prediction of effect on air flow rate in the presence of heated obstruction within a room, (2010) International Review of Mechanical Engineering (IREME), 4 (6), pp. 702-710.
S. Mukhopadhya, A. Dutta, A. N. Mullick and B. Majumdar, Effect of Five-hole probe tip shape on its calibration, Journal of the Aeronautical Society of India, Vol. 53, No.4, 2001, pp 271 – 279.
- There are currently no refbacks.
Please send any question about this web site to email@example.com
Copyright © 2005-2019 Praise Worthy Prize