scholarly journals Drag Reduction by Application of Different Shape Designs in a Sport Utility Vehicle

2021 ◽  
Vol 18 (3) ◽  
pp. 8870-8881
Author(s):  
Omer Elsayed ◽  
Ashraf A. Omar ◽  
Ali Jeddi ◽  
Saad EL HESSNI ◽  
Fatima Zahra Hachimy
Keyword(s):  
Drag Reduction ◽  
Flow Control ◽  
Flow Simulation ◽  
Direct Consequence ◽  
Aerodynamic Characteristics ◽  
Base Pressure ◽  
Pressure Recovery ◽  
Sport Utility Vehicle ◽  
Air Jet ◽  
Utility Vehicle

Road vehicles drag is a direct consequence of a  large wake area generated behind. This area is  created owing to the vehicle shape, which is  determined by the class, functional and aesthetic  of the vehicle. Aerodynamic  characteristics are a ramification and not the  reason for the vehicle architecture. To enhance  pressure recovery in the wake region, hence  reduce drag, three different passive flow control  techniques were applied to sport-utility-vehicle  (SUV). A three-dimensional SUV was designed in  CATIA, and a numerical flow simulation was  conducted using Ansys-Fluent to evaluate the  aerodynamic effectiveness of the proposed flow  control approaches. A closed rectangular flap as  an add-on device modifies the wake vortex  system topology, enhances vortex merging, and  increases base pressure which leads to a drag  reduction of 15.87%. The perforated roof surface  layer was used to delay flow separation. The  measured base pressure values indicate a  higher-pressure recovery, which globally  reflected in a drag reduction of 19.82%. Finally,  air guided through side rams was used as steady  blowing. A steady passive air jet introduced at the core of the longitudinal trailing  vortices leads to a confined wake area.  The net effects appear in a global increase in the  base pressure values and the pronounced drag  reduction of 22.67%. 

scholarly journals Separation Flow Control of a Generic Ground Vehicle Using an SDBD Plasma Actuator

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3805 ◽  
Author(s):  
Zheng Hui ◽  
Xingjun Hu ◽  
Peng Guo ◽  
Zewei Wang ◽  
Jingyu Wang
Keyword(s):  
Wind Speed ◽  
Drag Reduction ◽  
Flow Control ◽  
Maximum Velocity ◽  
Aerodynamic Characteristics ◽  
Separation Flow ◽  
Ionic Wind ◽  
Excitation Voltage ◽  
Plasma Generation ◽  
Wind Speeds

Quiescent flow and wind tunnel tests were performed to gain additional physical insights into flow control for automotive aerodynamics using surface dielectric barrier discharge plasma actuators. First, the aerodynamic characteristics of ionic wind were studied, and a maximum induced velocity of 3.3 m/s was achieved at an excitation voltage of 17 kV. Then, the optimal installation position of the actuator and the influence of the excitation voltage on flow control at different wind speeds were studied. The conclusions drawn are as follows. The effect of flow control is better when the upper electrode of the actuator is placed at the end of the top surface, increasing the likelihood of the plasma generation region approaching the natural separation location. The pressure on top of the slanted surface is primarily affected by airflow acceleration at a low excitation voltage and by the decrease of the separation zone at a high excitation voltage. The maximum drag reduction can be realized when the maximum velocity of ionic wind reaches 1.71 m/s at a wind speed of 10 m/s and 2.54 m/s at a wind speed of 15 m/s. Moreover, effective drag reduction can be achieved only by continuing to optimize the actuator to generate considerable thrust at a high wind speed.

scholarly journals Effects of Vehicle Type and Inter-Vehicle Distance on Aerodynamic Characteristics during Vehicle Platooning

2021 ◽  
Vol 11 (9) ◽  
pp. 4096
Author(s):  
Wootaek Kim ◽  
Jongchan Noh ◽  
Jinwook Lee
Keyword(s):  
Drag Coefficient ◽  
Flow Simulation ◽  
Aerodynamic Characteristics ◽  
Rear Side ◽  
Vehicle Type ◽  
Vehicle Platooning ◽  
Wide Range ◽  
The Impact ◽  
Low Pressures ◽  
Utility Vehicle

Considering the future development in vehicle platooning technology and the multiple models pertaining to complex road environments involving freight cars and general vehicles, the speed and distance of a vehicle model were set as variables in this study. This study aimed at analyzing the effect of currents acting differently using SolidWorks Flow Simulation tool for the vehicle platooning between different models of trucks that are currently being studied actively and sports utility vehicle (SUV) whose market share has been increasing, in order to evaluate the changes in the drag coefficient and their causes. Additionally, purpose-based vehicle (PBV) presented by Hyundai Motor (Ulsan, Korea) during the CES 2020 was considered. In this study, we found that the shape of the rear side of the leading vehicle reduces the drag coefficient of the following vehicle by washing the wake, similar to a spoiler at the rear. The rear side area of the leading vehicle forms a wide range of low pressures, which increases the drag coefficient effect of the following vehicle. The overall height of the leading vehicle also generates a distribution of low pressures above the rear of the vehicle. This reduces the impact of low pressures on the overall height of the following vehicle. The shape of the front of the following vehicle enables the wake of the leading vehicle, which involves low pressures, to inhibit the Bernoulli effect of the following vehicle. Furthermore, the front of the following vehicle continues to be affected by the wake of the leading vehicle, resulting in an increase in the drag coefficient reduction.

scholarly journals Experimental investigation on wake flow structures of Motor Industry Research Association square-back model

2020 ◽  
Vol 12 (6) ◽  
pp. 168781402093231
Author(s):  
Yingchao Zhang ◽  
Ruidong Wang ◽  
Chao Yang ◽  
Zijie Wang ◽  
Zhe Zhang
Keyword(s):  
Drag Reduction ◽  
Particle Image ◽  
Wake Flow ◽  
Flow Structures ◽  
Research Association ◽  
Sport Utility Vehicle ◽  
Motor Industry ◽  
Industry Research ◽  
Image Velocimetry ◽  
Utility Vehicle

Since the oil crisis of the last century, drag reduction for vehicles has become the focus of researchers. Currently the world’s major car brands have to seize the sport utility vehicle market. However, the sport utility vehicle models usually have a larger frontal area which brings challenges to drag reduction. This requires a better understanding of flow around sport utility vehicle models. The Motor Industry Research Association square-back vehicle model is similar to the sport utility vehicle geometry and can reflect the typical characteristics of aerodynamics of sport utility vehicle models. In this article, the wake flow structures of a 1/8 Motor Industry Research Association model is measured by particle image velocimetry. The results indicate that there is an obviously “n” type backflow vortex behind the vehicle. In the vertical direction, the vortex rotates from the outside to the inside, meanwhile the vortex rotates from the inside to the outside in the longitudinal direction. There is a velocity deficit region between the vortex and the back of the model which is an important source of drag force. This article summarizes the results of particle image velocimetry measurements from the model tests and obtains a picture of the structures of the wake vortex finally which can provide a theoretical basis for the drag reduction research in the future.

Field measurements of the harvestable power potentiality of an off-road sport-utility vehicle

Measurement ◽  
2021 ◽  
Vol 179 ◽  
pp. 109381
Author(s):  
Mohamed A.A. Abdelkareem ◽  
Lin Xu ◽  
Xingjian Jing ◽  
Abdelrahman B.M. Eldaly ◽  
Junyi Zou ◽  
...  
Keyword(s):  
Field Measurements ◽  
Sport Utility Vehicle ◽  
Utility Vehicle

scholarly journals Drag Reduction of a Circular Cylinder. 1st Report, Flow Control Using a Small Rod.

1994 ◽  
Vol 60 (573) ◽  
pp. 1554-1560 ◽  
Author(s):  
Tamotsu Igarashi ◽  
Takayuki Tsutsui ◽  
Hirochika Kanbe
Keyword(s):  
Circular Cylinder ◽  
Drag Reduction ◽  
Flow Control

A Design Concept for an Aluminum Sport Utility Vehicle Frame

2003 ◽  
Author(s):  
Michael W. Danyo ◽  
Christopher S. Young ◽  
Henry J. Cornille ◽  
Joseph Porcari
Keyword(s):  
Design Concept ◽  
Sport Utility Vehicle ◽  
Utility Vehicle

Aerodynamic Drag Reduction Investigation for a Simplified Road Vehicle Using Plasma Flow Control

2016 ◽  
Author(s):  
Bahram Khalighi ◽  
Joanna Ho ◽  
John Cooney ◽  
Brian Neiswander ◽  
Thomas C. Corke ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Flow Control ◽  
Plasma Flow ◽  
Aerodynamic Drag ◽  
Force Balance ◽  
Plasma Actuators ◽  
Ground Vehicles ◽  
Mean Velocity ◽  
Local Flow ◽  
Plasma Flow Control

The effect of plasma flow control on reducing aerodynamic drag for ground vehicles is investigated. The experiments were carried out for a simplified ground vehicle using single dielectric barrier discharge (SDBD) plasma actuators. The plasma actuators were designed to alter the flow structure in the wake region behind the vehicle. The Ahmed body was modified to allow eight different vehicle geometries (with backlight or slant angles of 0° and 35°). Each of these were further modified by rounding the edges with different radii. Flow visualizations such as particle streams and surface oil were used to quantify features of the local flow field. The drag on the models was measured using a force balance as well as by integrating the mean velocity profiles in the model wakes. The results indicated that flow modifications needed to be applied symmetrically (upper to lower and/or side to side). This was demonstrated with the 0° backlight angle (square-back) that had all four side-corners rounded. Plasma actuators were applied to all four of the rounded edges to enhance the ability to direct the flow into the wake. Wake measurements showed that steady actuation at a fixed actuator voltage reduced the drag by an average of 20% at the lower velocities (below 15 m/s) and by 3% at the highest velocity tested (20 m/s). Model constraints prevented increasing the plasma actuator voltage that was needed to maintain the higher drag reduction observed at the lower speeds.

Sign in / Sign up

Export Citation Format

Share Document