An Experimental Investigation of Forces on a Textured Cylinder at Subcritical Reynolds Numbers
نویسندگان
چکیده
Spanwise deviations from a perfect circular cross-section, affect the aerodynamics and hydrodynamics of cylindrical structures. In this study ability novel wavy cylinder, textured to reduce applied drag lift forces is investigated experimentally. Three different configurations proposed geometry, as well bare cylinder with helical strakes are 3D printed tested in an open circuit wind tunnel. Tests conducted at Reynolds numbers 3.5×104 8.0×104. Results show that time-averaged fluctuating on can be 20% 15% lower than those respectively. Amongst cylinders, straked exhibited lowest forces. However, were measured Tex30, through range tested. The Strouhal number Tex30 was found between cylinders.
منابع مشابه
experimental investigation of the characteristics of the wake of a rotating circular cylinder at different reynolds numbers and speed ratios
in this study, the characteristics of the wake around a rotating circular cylinder have been investigated experimentally. to this end, a cylinder with a circular cross-section of plexiglas with the length of 400 mm and a diameter of 20 mm have been tested in the wind tunnel. using existing methods, the characteristics of the wake and the drag coefficients of the model in different cases have be...
متن کاملInvestigation of Drag Coefficient at Subcritical and Critical Reynolds Number Region for Circular Cylinder with Helical Grooves
Drag reduction of an object is the major concern in many engineering applications. Experimental studies have been carried out on circular cylinder with helical grooves in a subsonic wind tunnel. Different cases of helical grooves with different pitches, helical groove angles and number of starts of helical groove on circular cylinder are tested. Experimental results show the drag coefficient is...
متن کاملIntegral Turbulent Length and Time Scales in Hydraulic Jumps: an Experimental Investigation at Large Reynolds Numbers
A hydraulic jump is a rapidly-varied open channel flow characterised by the sudden transition from a supercritical flow motion to a subcritical regime. The transition is associated with a rapid increase of water depth, a highly turbulent flow with macro-scale vortices, significant kinetic energy dissipation, a two-phase flow region and some strong turbulence interactions with the free surface l...
متن کاملThe drag - adjoint field of a circular cylinder wake at Reynolds numbers 20 , 100 and 500
This paper analyzes the adjoint solution of the Navier-Stokes equation. We focus on flow across a circular cylinder at three Reynolds numbers, ReD = 20, 100 and 500. The quantity of interest in the adjoint formulation is the drag on the cylinder. We use classical fluid mechanics approaches to analyze the adjoint solution, which is a vector field similar to a flow field. Production and dissipati...
متن کاملForce Statistics and Wake Structure Mechanism of Flow around a Square Cylinder at Low Reynolds Numbers
Numerical investigation of flow around a square cylinder are presented using the multi-relaxation-time lattice Boltzmann methods at different Reynolds numbers. A detail analysis are given in terms of time-trace analysis of drag and lift coefficients, power spectra analysis of lift coefficient, vorticity contours visualizations, streamlines and phase diagrams. A number of physical quantities mea...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Applied Fluid Mechanics
سال: 2021
ISSN: ['1735-3572', '1735-3645']
DOI: https://doi.org/10.47176/jafm.14.06.32495