Base drag reduction concept for commercial road vehicles

Mosiężny, Jędrzej; Ziegler, Bartosz; Grzymisławski, Przemysław; Ślefarski, Rafał

doi:10.1016/j.energy.2020.118075

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…The maximum drag reduction achieved was about 7.5%. Mosiezny et al [29] studied numerically the case of an active flow control device based on the Coanda effect added to a tractor-trailer. The results show that the drag can be reduced up to 11%.…”

Section: Introductionmentioning

confidence: 99%

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

Elsayed

Omar

Jeddi

et al. 2021

IJAME

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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%.

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Section: Introductionmentioning

confidence: 99%

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

Elsayed

Omar

Jeddi

et al. 2021

IJAME

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“…K-epsilon model is noticed to be more accurate in predicting the base pressure drag coefficient. There are many researchers who validated their numerical results using Ahmed body total drag coefficient without considering the section drag coefficients [14][15][16][17]. The total drag coefficient obtained in their results agrees well with the experimental data.…”

Section: Resultsmentioning

confidence: 53%

The Accuracy of the Numerical Solution in Predicting Ahmed Body Components Drag Coefficients

Hachimy

Omar²,

Elsayed³

2022

CFDL

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In recent years, the aerodynamic drag became a major interest of automotive industry as it is one of the main components affecting the fuel consumption. To reduce aerodynamic drag force and improve the energetic efficiency, a complete understanding of the flow around ground vehicles is highly required. This study focused on the accuracy of a three different turbulence models in predicting Ahmed body components drag coefficients. Ahmed Body is a simplified model which mimics the bluff bodies in automotive aerodynamics. This study uses ANSYS Fluent to simulate the flow around Ahmed Body. Three different turbulence models (K-epsilon, K-omega SST and SST) were used in the study. The drag coefficient components for the different sections of the model were validated with the experimental published data. The results have shown that the SST model predicted accurately the total drag coefficient but failed to provide good agreement for the components drag coefficients.

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“…P ψ and P w depend on the value of the rolling resistance coefficient f and the aerodynamic resistance coefficient cx, respectively. The work in [23][24][25][26] is devoted to the study of the effect of air resistance on the fuel consumption of motor vehicles under specified operating conditions. In [26], it was shown that at low speeds, the reduction of the rolling resistance has a greater effect on increasing the fuel economy of vehicles compared to reduction of the aerodynamic resistance coefficient.…”

Section: Mathematical Models For Evaluating the Energy Efficiency Of ...mentioning

confidence: 99%

Review of Methods for Evaluating the Energy Efficiency of Vehicles with Conventional and Alternative Power Plants

Mateichyk,

Kostian,

Smieszek

et al. 2023

Energies

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The evaluation of the energy efficiency of vehicles in operating conditions is used to solve management and control tasks in intelligent transport systems. The modern world fleet is characterized by an increase in the share of vehicles with alternative power plants (hybrid, electric, and hydrogen fuel cells). At the same time, vehicles with conventional power plants (internal combustion engines) remain in operation. A wide range of modern power plants determines the relevance of studying the advantages and limitations of existing methods of evaluating the vehicle energy efficiency, delineating the application scope and highlighting promising directions for their further development. The article systematizes the methods of evaluation and management of the energy efficiency of vehicles with conventional and alternative power plants. Special attention is paid to the assessment of energy consumption per unit of transport work at the stage of vehicle operation, taking into account various operational factors. The concept of a 3D morphological model of the transport system for evaluating the energy efficiency of vehicles is presented. An algorithm for the optimization of the current transport system configuration according to the criterion of an increase in the energy efficiency indicator is given.

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Base drag reduction concept for commercial road vehicles

Cited by 8 publications

References 6 publications

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

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

The Accuracy of the Numerical Solution in Predicting Ahmed Body Components Drag Coefficients

Review of Methods for Evaluating the Energy Efficiency of Vehicles with Conventional and Alternative Power Plants

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