Experimental study of flow past a surface mounted cylinder having a hemisperical end

Hebbar, KS and Ramakrishnan, SV and Yajnik, KS (1982) Experimental study of flow past a surface mounted cylinder having a hemisperical end. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Abstract

A study was conducted on two cylindrical models having13; a hemispherical end mounted norBal to a wind tunnel wall.13; The height of the cylindrical part was equal to the radius.13; The interest in this geometry stems from radomes, nuclear13; reactors and large telescope buildings. The diameters of13; the two models were 7.62cm and 15.24cm, and the experiments13; were conducted at two Reynolds numbers basedon the cylinder13; diameter, namely, 1 x 105 and 2 x 105. Static pressure13; surveys and oil flow visualization studies were carried out. The pressure data indicated approximately two-dimensional flow field over 70% of the cylinder height and a constant pressure region near the top of the hemispherical end extending to about 3% of the modeiquot;'height,which indicated the presence of flow separation near the top. The observed flow patterns indicated the presence of 3-D upstream separation and horse-shoe vortex system. However, a striking feature is that the near-wake structure is markedly different at the above two Reynolds numbers.

Item Type:	Monograph (Technical Report)
Uncontrolled Keywords:	Flow configuration;Oil-flow visualisation;Static pressure survey
Subjects:	AERONAUTICS > Aerodynamics
Depositing User:	Poornima Narayana
Date Deposited:	31 Aug 2006
Last Modified:	24 May 2010 04:19
URI:	http://nal-ir.nal.res.in/id/eprint/2549

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