Experimental study on the drag coefficient and flow structure of an axially symmetric model and factors affecting it, in wind tunnel

Esfandeh, Saeed; Khorasani Safar, Ali; Dehghan, Ali Akbar; Sheikhzadeh, Ghanbar Ali; Jamali, Mehdi

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Modares Mechanical Engineering

Volume 16, Issue 7 (9-2016) Modares Mechanical Engineering 2016, 16(7): 71-82 | Back to browse issues page

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Esfandeh S, Khorasani Safar A, Dehghan A A, Sheikhzadeh G A, Jamali M. Experimental study on the drag coefficient and flow structure of an axially symmetric model and factors affecting it, in wind tunnel. Modares Mechanical Engineering 2016; 16 (7) :71-82
URL: http://mme.modares.ac.ir/article-15-2593-en.html

Experimental study on the drag coefficient and flow structure of an axially symmetric model and factors affecting it, in wind tunnel

Saeed Esfandeh

, Ali Khorasani Safar

, Ali Akbar Dehghan

, Ghanbar Ali Sheikhzadeh ^*

¹, Mehdi Jamali

Abstract: (5043 Views)

present study is done to evaluate the effect of parameters like trip strip installation, free stream velocity, geometery of model nose (SUBBOF nose and DRDC nose) and putting up model in pitch and yaw angle, on drag coefficient. also the effect of stand geometry of an axially symmetric model in wind tunnel on wake flow structure and drag coefficient in zero and ten degree angles of attack was investigated. choosing best distance behind the model for data acquisition in order to calculate drag coefficient under consideration of turbulence effects in one dimension is the other item to investigate in present study. all experiments have been done in an open circuit wind tunnel at university of Yazd and data acquisitions has been done with a one dimensional hot wire. according to calculations installation of trip strip enhanced drag coefficient in all cases. also drag coefficient decreased with increasing free stream velocity. putting up the model in pitch and yaw angle of attack increased drag coefficient. between two nose shapes that examined, the SUBBOF nose shape choosed as suitable nose. a stand with NACA0012-64 geometry and Rod stand were selected as the most appropriate stands for zero and 10 degree angles of attack.

Keywords: axially symmetric model, Wake, Wind tunnel, hot wire, Drag coefficient

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Article Type: Research Article | Subject: Experimental Fluid Mechanics & Heat Transfer
Received: 2016/05/14 | Accepted: 2016/06/11 | Published: 2016/07/13

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