Investigation on Aerodynamic Drag Reduction of Commercial Truck Based on External Styling of Cab

2013 ◽  
Vol 307 ◽  
pp. 186-191 ◽  
Author(s):  
Peng Guo ◽  
Xing Jun Hu ◽  
Yun Yun Zhu ◽  
Qiang Fu ◽  
Xin Yu Wang ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Wind Tunnel ◽  
Drag Reduction ◽  
Energy Saving ◽  
High Speed ◽  
Cfd Simulation ◽  
Aerodynamic Drag ◽  
Impact Mechanism ◽  
Aerodynamic Drag Reduction ◽  
The Impact

Aerodynamic drag reduction of commercial truck at high speed is one of the important ways to reduce its energy consumption. CFD simulation and wind tunnel tests are performed on a kind of commercial truck, to study the influence of the cab shape and different kinds of guide cowls on aerodynamic drag, and the impact mechanism was also analyzed. It shows that the cab shape will make great contributions to the aerodynamic drag while the truck travelling, and through improving the shape of cab, guiding the air flow passed, it can effectively reduce the aerodynamic drag and achieve energy saving.

Aerodynamic drag reduction in winter sports: The quest for “free speed”

2020 ◽  
pp. 175433712092109
Author(s):  
Len Brownlie
Keyword(s):  
Wind Tunnel ◽  
Drag Reduction ◽  
High Speed ◽  
Aerodynamic Drag ◽  
Ice Hockey ◽  
Future Research ◽  
Alpine Skiing ◽  
Winter Sports ◽  
Speed Skating ◽  
Cross Country

The Winter Olympics are a highly competitive sporting environment where subtle improvements in performance can impact the finishing order in many events. Aerodynamic drag is known to be a significant resistive force to human movement in high-speed sports, such as alpine skiing, speed skating and bobsleigh. Aerodynamic drag also represents an important determinant of performance in sports such as ice hockey, snowboard cross and cross-country skiing. From 2000 to 2018, a series of wind tunnel–based research projects were conducted to provide aerodynamically optimized apparel, equipment and wind tunnel simulation training to elite Canadian and American winter sports athletes involved in bobsleigh, skeleton, luge, ice hockey, speed skating, cross-country, alpine and para-alpine skiing, biathlon, ski-cross and snowboard cross. This article reviews the role of aerodynamic drag in winter sports, considers fundamental principles of air flow around bluff bodies and methods of drag reduction in ice and snow sports, while providing experimental results from an extensive database of wind tunnel investigations. Deficits in the literature suggest productive areas for future research to improve athletic performance in these sports.

Effect of Boat Tail Profile on Drag Coefficient of a Sedan Using CFD

2017 ◽  
Author(s):  
Salman Javed ◽  
Farhan Javed ◽  
Samsher
Keyword(s):  
Drag Reduction ◽  
High Speed ◽  
Aerodynamic Drag ◽  
Fuel Efficiency ◽  
Primary Objective ◽  
Optimum Shape ◽  
Passenger Cars ◽  
Ground Conditions ◽  
Catenary Curve ◽  
Aerodynamic Drag Reduction

An appendage is a boat tail which is installed at the rear section of the passenger car. An inflatable appendage has been developed to reduce the aerodynamic drag experienced by passenger cars. It can be inflated when driving under high-speed conditions and deflated while parking. In this study, an appendage is designed to maintain the streamlined rear body configuration and reduce flow separation. The profile of this aerodynamic device is based on several mathematical curves such as kappa curve, lame curve, catenary curve and aerofoil curve. Four types of boat tailing devices with different lengths and profiles were installed, and computational fluid dynamics (CFD) analysis was performed under moving ground conditions. The primary objective of this study is to find an optimum shape for the appendage and explain the aerodynamic drag reduction mechanism. Comparisons between the base model and modified models were made on the basis of the coefficient of drag, pressure contours, velocity contours, velocity streamlines and pressure distribution plot. It is shown that significant drag reduction can be obtained with the proposed aerodynamic device. Improvement in fuel efficiency varies based on the profile of add-on device. It is shown numerically that the aerodynamic performance is improved by 18.8% compared to the base model. As a result, the fuel consumption of the modified sedan reduces by 4.5%.

Effect of Vortex Generators on Aerodynamic Characteristics of a Car

2011 ◽  
Vol 418-420 ◽  
pp. 1873-1877
Author(s):  
Xu Yan ◽  
Jian Ye ◽  
Zhi Ming Zhao ◽  
Xing Jun Hu ◽  
Lei Liao
Keyword(s):  
Drag Reduction ◽  
Drag Coefficient ◽  
Energy Saving ◽  
Emission Reduction ◽  
Aerodynamic Drag ◽  
Vortex Generator ◽  
Aerodynamic Characteristics ◽  
Vortex Generators ◽  
Numerical Stimulation ◽  
Aerodynamic Drag Reduction

In order to reduce the aerodynamic drag, a domestic car was selected as study object to research the size and the layout of the vortex generator with the method numerical stimulation. By comparing the values of drag coefficient (Cd) the cars with vortex generators (VGs) and the original and then analyzing the mechanism of drag reduction, a final optimized strategy was achieved. It was concluded that VGs can lower the Cd of a car but the effect depends on the size and the layout. Our research achievements can serve as reference for automobile aerodynamic drag reduction, and are also significant to energy saving and emission reduction.

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