Volume 25, Issue 1 (January 2024)                   Modares Mechanical Engineering 2024, 25(1): 33-41 | Back to browse issues page

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Ardekani E, Ardekani M A, Farhani F. Experimental Investigation of Strength of Vortex Shedding from a Semicircular Cylinder Dual Bluff Body. Modares Mechanical Engineering 2024; 25 (1) :33-41
URL: http://mme.modares.ac.ir/article-15-78909-en.html
Experimental Investigation of Strength of Vortex Shedding from a Semicircular Cylinder Dual Bluff Body
Ehsan Ardekani1 , Mohammad Ali Ardekani * 2, Foad Farhani1
1- Iranian Research Organization for Science and Technology (IROST)
2- Iranian Research Organization for Science and Technology (IROST) , ardekani@irost.ir
Abstract:   (12 Views)
One of the methods to improve the performance of the vortex flowmeter, especially for low flowrate, is to use a dual bluff model that increases the vortex shedding frequency. In this experimental research work, the vortex shedding from a dual cylindrical bluff model of semicircular cross-section, at different l d  ratios, where d  is the diameter and l  is the distance between the two semicircular cylinders in series is measured and investigated using a wind tunnel and hot-wire anemometer. Results show that the Strouhal number for dual bluff body depends on the Reynolds number and l d . In the range of 0/8≤ l d <2 , the Strouhal number has changes and jumps compared to the Reynolds number. Therefore, it is not suitable for vortex flowmeter application. also show that the velocity frequency spectrum, it can be determined that the highest value of the turbulent intensity is related to the oscillating velocity with the vortex shedding frequency, and therefore, to investigate the strength of vortex shedding frequency, the turbulent intensity was investigated, that the value of turbulent intensity depends on Reynolds number and l d . Considering the standard deviation of the repeatability of the Strouhal number reading and also the strength of the vortex shedding frequency (investigation of the turbulent intensity), for 0< l d <0/8  and 2≤ l d ≤3 , a dual cylindrical bluff model of semicircular cross-section, placed in series, is suitable for vortex flowmeter application
Keywords: Dual Bluff Body, Reynolds Number, Strouhal Number, Turbulent Intensity, Vortex Flowmeter, Vortex Shedding
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Article Type: Original Research | Subject: Experimental Fluid Mechanics
Received: 2025/01/8 | Accepted: 2025/03/1 | Published: 2024/12/30
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