Volume 13, Issue 15 (Third Special Issue 2014)                   Modares Mechanical Engineering 2014, 13(15): 98-109 | Back to browse issues page

‎ 20.1001.1.10275940.1392.13.15.17.7

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Saeidi nezhad A, Dehghan A A, Dehghan Manshadi M, Kazemi Esfeh M. Experimental Investigation of the Vortex Structure on a Submersible Model. Modares Mechanical Engineering 2014; 13 (15) :98-109
URL: http://mme.modares.ac.ir/article-15-8303-en.html
Experimental Investigation of the Vortex Structure on a Submersible Model
Ali Saeidi nezhad1 , Ali Akbar Dehghan * 2, Mojtaba Dehghan Manshadi3 , Mohamad Kazemi Esfeh4
1- PhD Student, Mech. Eng., Yazd Univ., Yazd, Iran
2- Assoc. Prof., Mech. Eng., Yazd Univ., Yazd, Iran
3- Assis. Prof., Mech. Eng., Malek Ashtar Univ., Esfahan, Iran.
4- MSc. Mech. Eng., Yazd Univ., Yazd, Iran
Abstract:   (6223 Views)
The flow field around the axisymmetric streamlined bodies which forms the main body of the airplanes and submarines has been the subject of several researches. The present study aimed to investigate the flow field around a standard submersible model in various angles of attack by employing two visualization methods. The vortex structures around the model are qualitatively studied at the 40-degree angle of attack in a vertical wind tunnel. These structures are visualized by the laser sheet illumination of the smoke injected flow. The shear stress field lines on the model surface in the 0≤ α ≤35° angles of attack became visible by oil and pigments. Noteworthy and distinct aspect of the present study is the application of two empirical visualizing methods which made three dimensional vortical field more understandable. Formation and development of the primary and secondary vortex along the model length are qualitatively interpreted by the results of the smoke and laser light visualization technique. Moreover, the primary and secondary separation lines along model length for various angles of attack were deduced from the results of the oil flow visualization.
Keywords: Flow behavior, Submersible model, Flow visualization, Wind tunnel
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Article Type: Research Article | Subject: Aerodynamics|Turbulance|Marine Structures|Experimental Fluid Mechanics & Heat Transfer
Received: 2013/05/13 | Accepted: 2013/08/26 | Published: 2014/02/20
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