Aerodynamic drag reduction of heavy vehicles using append devices by cfd analysis
来源期刊:中南大学学报(英文版)2015年第12期
论文作者:Mehrdad khosravi Farshid Mosaddeghi Majid Oveisi Ali khodayari-b
文章页码:4645 - 4652
Key words:aerodynamics; computational fluid dynamic (cfd); append device; drag reduction; fuel consumption
Abstract: Improving vehicle fuel consumption, performance and aerodynamic efficiency by drag reduction especially in heavy vehicles is one of the indispensable issues of automotive industry. In this work, the effects of adding append devices like deflector and cab vane corner on heavy commercial vehicle drag reduction were investigated. For this purpose, the vehicle body structure was modeled with various supplementary parts at the first stage. Then, computational fluid dynamic (CFD) analysis was utilized for each case to enhance the optimal aerodynamic structure at different longitudinal speeds for heavy commercial vehicles. The results show that the most effective supplementary part is deflector, and by adding this part, the drag coefficient is decreased considerably at an optimum angle. By adding two cab vane corners at both frontal edges of cab, a significant drag reduction is noticed. Back vanes and base flaps are simple plates which can be added at the top and side end of container and at the bottom with specific angle respectively to direct the flow and prevent the turbulence. Through the analysis of airflow and pressure distribution, the results reveal that the cab vane reduces fuel consumption and drag coefficient by up to 20 % receptively using proper deflector angle. Finally, by adding all supplementary parts at their optimized positions, 41% drag reduction is obtained compared to the simple model.
Mehrdad khosravi1, Farshid Mosaddeghi2, Majid Oveisi3, Ali khodayari-b4
(1. Young Researches and Elite Club, Borujerd Branch, Islamic Azad University, Borujerd, Iran;
2. Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;
3. Lecturer Department of marine engineering, Chabahar, Maritime University, Iran;
4. Department of Mechanical Engineering, Urmia University, Urmia, Iran)
Abstract:Improving vehicle fuel consumption, performance and aerodynamic efficiency by drag reduction especially in heavy vehicles is one of the indispensable issues of automotive industry. In this work, the effects of adding append devices like deflector and cab vane corner on heavy commercial vehicle drag reduction were investigated. For this purpose, the vehicle body structure was modeled with various supplementary parts at the first stage. Then, computational fluid dynamic (CFD) analysis was utilized for each case to enhance the optimal aerodynamic structure at different longitudinal speeds for heavy commercial vehicles. The results show that the most effective supplementary part is deflector, and by adding this part, the drag coefficient is decreased considerably at an optimum angle. By adding two cab vane corners at both frontal edges of cab, a significant drag reduction is noticed. Back vanes and base flaps are simple plates which can be added at the top and side end of container and at the bottom with specific angle respectively to direct the flow and prevent the turbulence. Through the analysis of airflow and pressure distribution, the results reveal that the cab vane reduces fuel consumption and drag coefficient by up to 20 % receptively using proper deflector angle. Finally, by adding all supplementary parts at their optimized positions, 41% drag reduction is obtained compared to the simple model.
Key words:aerodynamics; computational fluid dynamic (cfd); append device; drag reduction; fuel consumption