News

 Statistics

Number of Journals34
Number of Issues1,306
Number of Articles9,428
Article View9,191,233
PDF Download5,622,141
jafari gavzan, I., firouz abadi, B., amini, H. (2018). Experimental Investigation of Cavitation in Flow around an Extended Wedge. Electronic and Cyber Defense, 7(1), 27-35.
iraj jafari gavzan; bahar firouz abadi; hekmat amini. "Experimental Investigation of Cavitation in Flow around an Extended Wedge". Electronic and Cyber Defense, 7, 1, 2018, 27-35.
jafari gavzan, I., firouz abadi, B., amini, H. (2018). 'Experimental Investigation of Cavitation in Flow around an Extended Wedge', Electronic and Cyber Defense, 7(1), pp. 27-35.
jafari gavzan, I., firouz abadi, B., amini, H. Experimental Investigation of Cavitation in Flow around an Extended Wedge. Electronic and Cyber Defense, 2018; 7(1): 27-35.

Experimental Investigation of Cavitation in Flow around an Extended Wedge

مکانیک سیالات و آیرودینامیک
Article 3, Volume 7, Issue 1 - Serial Number 21, June 2018, Pages 27-35    PDF (822.68 K)
Authors
iraj jafari gavzan* 1; bahar firouz abadi2; hekmat amini1
1semnan
2sharif
Receive Date: 19 March 2017,  Revise Date: 19 February 2019,  Accept Date: 19 September 2018 
Abstract
To establish a variety of cavitating flow regimes, the combined body with wedge nose and rectangular afterbody is usually used. In this research work, the nose angle and the afterbody dimensions of model were 60° and 22cmx10cmx1cm, respectively. Its fabricated material is nearly smooth steel with roughness of 0.01mm. Also, another model with 30° nose angle and the same dimensions of the afterbody is tested. Two mentioned bodies were installed at the test section of a high speed cavitation tunnel. If the speed and pressure of the flow in the tunnel are varied, first cavitation inception occurs, such as a white band at the interface. Then, a little decrease the cavitation number causes the sheet cavitation along the surfaces of the afterbody. However, they are not established simultaneously at the upper and lower planes of the afterbody. By increasing the length of the sheet cavitation, regular oscillation occurs. Observed cloud cavitation is due to the separation of sheet regime which occurs by the re-entrant jet. If cavitation number is decreased slowly, then the vapor sheet covers the upper and lower planes of the afterbody. At the same cavitation numbers, cloud cavitation regimes on the two mentioned planes are not equal. At an especial length of the sheet cavity, the rate of length increase will be intensified.
Keywords
Cavitation; Extended Wedge; Length Oscillation; Sheet and Cloud Cavitation
References
  1. Keil, T., Pelz, P.F., and Buttenbender, J. “On the Transition from Sheet to Cloud Cavitation”, The 8th International Symposium on Cavitation, August 13-16, Singapore, Singapore,2012.
  2. Franc, J. P. “Physics and Control of Cavitation. in Design and Analysis of High Speed Pumps” University of Gernoble, France, RTO-EN-AVT-143, 2006.
  3. Brennen, C.E. “Cavitation and Bubble Dynamics”, Oxford University Press, New York, USA, 1995.
  4. Franc, J.P. and Michel, J.M. “Fundamentals of Cavitation”, Grenoble Sciences”, Dordrecht, Netherlands, 2004.
  5. Wang,  G., Senocak,  I., Shyy, W. Ikohagi, T., and Cao, S. “Dynamics of Attached Turbulent Cavitating flows”, Prog. Aerosp. Sci, Vol. 37, pp. 551–581, 2001.
  6. Kawakami, D.T., Fuji, A., Tsujimoto,Y., and Arndt, R.E.A. “An Assessment of the Influence of Environmental Factors on Cavitation Instabilities”, J. Fluids Eng., Vol. 130, pp. 1-8, 2008.
  7. Kim, J. and Lee, J.S., “Numerical Study of Cloud Cavitation Effects on Hydrophobic Hydrofoils” Int. J. Heat and Mass Trans., Vol. 83, pp. 591–603, 2015.
  8. Roohi, E. Zahiri, A.P., and Fard, M.P. “Numerical Simulation of Cavitation around A Two-dimensional Hydrofoil, Using VOF Method and LES Turbulence Model”, Appl. Math. Model, Vol. 37, pp. 6469–6488, 2013.
  9. Vinogradova, O.I., “Slippage of Water over Hydrophobic Surfaces”, Int. J. Miner. Process, Vol. 56, pp. 31–60, 1999.

10. Reisman, G.E., Wang Y.C., and Brennen, C.E. “Observations of Shock Waves in Cloud Cavitation” , J. Fluid Mech., Vol. 355, pp. 255-283, 1998.

11. Dular, M. and Petkovsek, M. "Simultaneous Observation of Cavitating Structures and Cavitation Erosion”, Wear, Vol. 300, pp. 55-64, 2013.

12. Franc,  J.P.  “Partial  Cavity  Instabilities  and  Re-entrant Jet”, International  Symposium  on  Cavitation  CAV2001, Pasadena, USA, 2001.

13. Kravtsova, A.Y. , Markovich, D.M., Pervunin, K.S., and Imoshevskiy, M.V.T, “Experimental Investigation of Cavitating Flow about a Cascade of NACA0015 Series Hydrofoils”, the 16th Int. Symp. on Applications of Laser Techniques to Fluid Mechanics, Lisbon, Portugal, pp. 09-12, 2012.

14. Ji, B., Luo X.W., Roger E., Arndt, A., Xiaoxing P., and Wu,Y. ”Large Eddy Simulation and Theoretical Investigations of the Transient Cavitating Vortical flow Structure around a NACA66 Hydrofoil”, International Journal of Multiphase Flow, Vol. 68, pp.121–134, 2015.

15. Brander, P.A., Walker, G.J.,  Niekamp, P.N. and Anderson, B.  “An Experimental Investigation of Cloud Cavitation about a Sphere”, J. Fluid Mech., Vol. 656, pp. 147-176, 2010.

16.   Biluš, I., Bombek,G.,  Hočevar, M., Širok, B., Cenčič, T., and Petkovšek, M. “The Experimental Analysis of Cavitating Structure Fluctuations and Pressure Pulsations in the Cavitation Station”, J. Mech. Eng., Vol. 60, No. 3, pp. 147-157, 2014.

17. Jafari Gavzan, I. and Rad, M. ”Influence of After Body and Boundary Layer on Cavitating Flow”, Int. J. Eng., Vol. 22, No. 2, pp. 185–196, 2009.

18. Brennen, C.E. “Cavitation and Bubble Dynamics”, Cambridge University Press, New York, USA, 2014.

19. Gnanaskandan, A. and Mahesh, K. “Numerical Investigation of Near-Wake Characteristics of Cavitating Flow over a Circular Cylinder”, JFM, Vol. 790, pp. 453-491, 2016.

20. Shams, I., Jafari Gavzan, I., and Rad, M. “Evaluation of Numerical Simulation and Experimental Study on Cavitation and Bubble Development”, ISME Conference, Isfahan, Iran, 2006. 

Statistics
Article View: 506
PDF Download: 218