The Effect of Plasma Actuator Placement on Drag Coefficient Reduction of Ahmed Body as an Aerodynamic Model

2016 ◽  
Vol 7 (2) ◽  
pp. 306 ◽  
Author(s):  
James Julian ◽  
Harinaldi Harinaldi ◽  
Budiarso Budiarso ◽  
Revan Difitro ◽  
Parker Stefan
Keyword(s):  
Drag Coefficient ◽  
Plasma Actuator ◽  
Aerodynamic Model ◽  
Actuator Placement ◽  
Coefficient Reduction ◽  
Ahmed Body

Experimental Study of Flow Control Over a Standard Road Vehicle Using Plasma Actuator

2020 ◽  
Vol 22 (4) ◽  
pp. 1047-1060
Author(s):  
S. Shadmani ◽  
S. M. Mousavi Nainiyan ◽  
R. Ghasemiasl ◽  
M. Mirzaei ◽  
S. G. Pouryoussefi
Keyword(s):  
Flow Control ◽  
Pressure Distribution ◽  
Drag Force ◽  
Separated Flow ◽  
Plasma Actuator ◽  
Road Vehicle ◽  
Slant Angle ◽  
Total Drag ◽  
Slant Surface ◽  
Ahmed Body

AbstractAhmed Body is a standard and simplified shape of a road vehicle that's rear part has an important role in flow structure and it's drag force. In this paper flow control around the Ahmed body with the rear slant angle of 25° studied by using the plasma actuator system situated in middle of the rear slant surface. Experiments conducted in a wind tunnel in two free stream velocities of U = 10m/s and U = 20m/s using steady and unsteady excitations. Pressure distribution and total drag force were measured and smoke flow visualization carried out in this study. The results showed that at U = 10m/s using plasma actuator suppress the separated flow over the rear slant slightly and be effective on pressure distribution. Also, total drag force reduces in steady and unsteady excitations for 3.65% and 2.44%, respectively. At U = 20m/s, using plasma actuator had no serious effect on the pressure distribution and total drag force.

Aerodynamics of Cyclist Posture, Bicycle and Helmet Characteristics in Time Trial Stage

2012 ◽  
Vol 28 (3) ◽  
pp. 317-323 ◽  
Author(s):  
Vincent Chabroux ◽  
Caroline Barelle ◽  
Daniel Favier
Keyword(s):  
Statistical Analysis ◽  
Wind Tunnel ◽  
Drag Coefficient ◽  
Drag Force ◽  
Time Trial ◽  
Frontal Area ◽  
Significant Gain ◽  
Upper Limbs ◽  
Force Coefficient ◽  
Coefficient Reduction

The present work is focused on the aerodynamic study of different parameters, including both the posture of a cyclist’s upper limbs and the saddle position, in time trial (TT) stages. The aerodynamic influence of a TT helmet large visor is also quantified as a function of the helmet inclination. Experiments conducted in a wind tunnel on nine professional cyclists provided drag force and frontal area measurements to determine the drag force coefficient. Data statistical analysis clearly shows that the hands positioning on shifters and the elbows joined together are significantly reducing the cyclist drag force. Concerning the saddle position, the drag force is shown to be significantly increased (about 3%) when the saddle is raised. The usual helmet inclination appears to be the inclination value minimizing the drag force. Moreover, the addition of a large visor on the helmet is shown to provide a drag coefficient reduction as a function of the helmet inclination. Present results indicate that variations in the TT cyclist posture, the saddle position and the helmet visor can produce a significant gain in time (up to 2.2%) during stages.

Underbody aerodynamics: Drag coefficient reduction in road vehicles

2018 ◽  
Author(s):  
R. Heidemann Jr ◽  
A. F. A. Rodrigues ◽  
A. Bohrer ◽  
C. L. Gertz ◽  
A. Cervieri
Keyword(s):  
Drag Coefficient ◽  
Road Vehicles ◽  
Coefficient Reduction

Control of Oscillations of a Wing Subjected to 3D Unsteady Subsonic Aerodynamic Loads Using Piezoelectric Actuators

2012 ◽  
Author(s):  
Tahereh Mirmohammadi ◽  
Arun K. Misra ◽  
Dan Mateescu
Keyword(s):  
Control Method ◽  
Three Dimensional ◽  
Element Formulation ◽  
Sensors And Actuators ◽  
Aerodynamic Loading ◽  
Aerodynamic Model ◽  
Active Feedback ◽  
Feedback Control Method ◽  
And Control ◽  
Actuator Placement

In the recent years, using piezoelectric material as sensors and actuators has drawn significant attention in vibration analysis and control of structures. In the present paper, bonded piezoelectric sensors and actuators have been used to control the aeroelastic oscillations of a cantilever wing under the effects of three-dimensional unsteady subsonic aerodynamic loading. An aerodynamic model using a numerical panel method is developed and validated to calculate the three-dimensional unsteady aerodynamic loading and finite element formulation is applied to model the wing structure as a cantilever plate undergoing small transverse oscillations. The structural and aerodynamic models are combined to simulate the aeroelastic oscillations and interchange the data simultaneously. An active feedback control method to suppress the oscillations is presented and investigated. Finally, an analysis is performed to examine the effects of actuator placement on the wing surface in suppression of oscillations.

scholarly journals Modelling of Drag Force Reduction for a Waterjet Propulsion System

2021 ◽  
Vol 58 (5) ◽  
pp. 3-14
Author(s):  
M. Cerpinska ◽  
M. Irbe ◽  
A. Pupurs ◽  
K. Burbeckis
Keyword(s):  
Drag Coefficient ◽  
Drag Force ◽  
Velocity Ratio ◽  
The Body ◽  
Inlet Velocity ◽  
Minimum Drag ◽  
Simulation Results ◽  
Force Reduction ◽  
Design Options ◽  
Coefficient Reduction

Abstract The paper provides simulation results for SUP (Stand Up Paddle) board appendage resistance. Additional propulsion is added to the SUP board. It is equipped with a waterjet. The waterjet is attached to the board rudder. This increases the drag coefficient for rudder five times. To reduce the drag variable, design options for the waterjet duct were proposed. The simulation tests were performed using SolidWorks Flow software using two types of simulations, namely, the pressure on the body and the flow around the body. The objective was to streamline the bluff duct of the waterjet and thus to create the appendage design with minimum drag force from fluid flow and possibly greater Inlet Velocity Ratio. Calculations showed that rounding-off the edges of waterjet duct resulted in 35 % of drag coefficient reduction, while further streamlining reduced it by additional 10 %.

scholarly journals Experimental Study of Flow Control Over an Ahmed Body Using Plasma Actuator

2020 ◽  
Vol 22 (1) ◽  
pp. 239-252
Author(s):  
S. Shadmani ◽  
S. M. Mousavi Nainiyan ◽  
R. Ghasemiasl ◽  
M. Mirzaei ◽  
S. G. Pouryoussefi
Keyword(s):  
Flow Control ◽  
Pressure Distribution ◽  
Drag Force ◽  
Separated Flow ◽  
Plasma Actuator ◽  
Slant Angle ◽  
Total Drag ◽  
Slant Surface ◽  
Actuator System ◽  
Ahmed Body

AbstractAhmed Body is a standard and simplified shape of a road vehicle that's rear part has an important role in flow structure and it's drag force. In this paper flow control around the Ahmed body with the rear slant angle of 25° studied by using the plasma actuator system situated in middle of the rear slant surface. Experiments conducted in a wind tunnel in two free stream velocities of U = 10 m/s and U = 20 m/s using steady and unsteady excitations. Pressure distribution and total drag force was measured and smoke flow visualization carried out in this study. The results showed that at U = 10 m/s using plasma actuator suppress the separated flow over the rear slant slightly and be effective on pressure distribution. Also total drag force reduces in steady and unsteady excitations for 3.65% and 2.44%, respectively. At U = 20 m/s, using plasma actuator had no serious effect on the pressure distribution and total drag force.

An Analytical Approach to Improve Drag Control Techniques for the Ahmed Body

2011 ◽  
Author(s):  
Charles-Henri Bruneau ◽  
Emmanuel Creuse´ ◽  
Delphine Depeyras ◽  
Patrick Gillie´ron ◽  
Iraj Mortazavi
Keyword(s):  
Drag Coefficient ◽  
Analytical Approach ◽  
Control Process ◽  
Strong Relationship ◽  
Significant Part ◽  
Back Wall ◽  
Control Techniques ◽  
Ahmed Body

The vortices generated behind a simplified vehicle induce presssure forces at the back wall that contribute to a significant part of the drag coefficient. The study shows the strong relationship between the distance of the vortices to the back wall and these pressure forces. In particular, control process can modify the trajectory of the vortices to accelerate their removal from the wall and consequently reduce the drag coefficient.

scholarly journals Aerodynamics Analysis and Range Enhancement Study of 81mm Mortar Shell (French Design)

2021 ◽  
Vol 84 (1) ◽  
pp. 148-159
Author(s):  
Roman Kalvin ◽  
Juntakan Taweekun ◽  
Muhammad Waqas Mustafa ◽  
Saba Arif
Keyword(s):  
Drag Coefficient ◽  
Parabolic Type ◽  
Cfd Analysis ◽  
Ansys Fluent ◽  
Flight Duration ◽  
Percent Increase ◽  
Fluent Software ◽  
Computational Fluid Dynamics Cfd ◽  
French Design ◽  
Coefficient Reduction

The aim of this research is performing the Computational Fluid Dynamics (CFD) analysis of 81mm Mortar Shell (French Design). The analysis is performed using ANSYS Fluent Software on three different Mach numbers (0.72, 0.76, and 0.84) and results are compared with existing design of 81mm HE M57D A2 Mortar. The drag coefficient of new modified design is found to be less than the existing model. The range of mortar shell is increased by 271 meters because of low drag coefficient with 5.96% percent increase in range and 15.73% decrease in drag coefficient value. Parabolic type; light weighted material fuze casing applied over the existing fuze will result in increase in aerodynamics, range enhancement and drag coefficient reduction. Weight optimization by using lighter material for mortar components and increasing the muzzle velocity can also increase flight duration of the projectile and increase its range. The analysis on 81mm Mortar Shell is a part of range enhancement study to overcome the short fall in required range of mortar shells.

scholarly journals Experimental Investigation of Flow Control over an Ahmed Body using DBD Plasma Actuator

2018 ◽  
Vol 11 (5) ◽  
pp. 1267-1276 ◽  
Author(s):  
S. Shadmani ◽  
S. M. Mousavi Nainiyan ◽  
M. Mirzaei ◽  
R. Ghasemiasl ◽  
S. G. Pouryoussefi ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Flow Control ◽  
Plasma Actuator ◽  
Dbd Plasma ◽  
Ahmed Body
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