International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 05 | May -2017
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p-ISSN: 2395-0072
CFD ANALYSIS FOR DRAG FORCE REDUCTION IN INTER-CITY BUSES Mr. Devesh yadav 1, Mr. Sumit chauhan 2, Mr. Shashank karki 3, Mr. Satya ranjan nayak 4, Mr. Nitin kumar 5, Associate Prof. Mr.S.Sudhakar babu 6 12345Final
Year Student, Department of mechanical Engineering, K.L.University Green filed Vaddesawaram Dist:Guntur(A.P) , India
6Associate
Professor, Department of mechanical Engineering, K.L.University Green filed Vaddesawaram Dist:Guntur(A.P) , India -----------------------------------------------------------------------***---------------------------------------------------------------------ABSTRACT: The road transport now a day is becoming
been reduced; combustion is optimized e.g. direct injection, spark timing etc., along with these downsizing and turbo charging of internal combustion engines has been done. Reduction of the driving resistance of the vehicle is however one of the most effective approaches.
uneconomical because of the rising fuel price and strict government regulations. The two essential factors for a successful operation in the competitive world are exterior styling and aerodynamically efficient design for reduction of engine load which reflects in the reduction of fuel consumption. The outer surface and structure of the bus are the precedence’s of the bus body building company and ignore the aerodynamic. The aerodynamic exterior design of the present intercity buses is poor. The aim of this project is to modify the outer surface and structure of the bus aerodynamically in order to decrease the effect of drag force of the vehicle which in turn leads to reduced fuel consumption of the vehicle. To reduce the drag force by using CFD the two prototype bus body has been modeled, namely model 1 and model 2. Model 1 is existing intercity bus model and model 2 is modification of existing intercity bus. Model 2 is useful to reduce the drag force by modifying and analyzing by using CFD. Increased performance and reduced the fuel requirement occurs as a result of reduced drag force. The overall aerodynamic drag force is reduced.
The following expression can determine the required force to propel the vehicle: Freq = Fd + Fr + Fa + Fg ...(1) Where, Fd = 1/2 * V2 aerodynamic drag force Fr = force due to rolling resistance Fa = force needed to accelerate the vehicle Fg = Wsin - climbing resistance due to gravity Hence the mass, the rolling resistance and the aerodynamics are the parameters that are to be improved by automotive industry. The rolling resistance and aerodynamic resistance are still equal in around 100km/h generally for a typical passenger vehicle and the aerodynamic drag is the main source of driving resistance at highway velocities while the rolling resistance stays more or less constant.
KEY WORDS: Aerodynamics, drag force, inter-city buses, exterior styling.
1.INTRODUCTION: Now days the automotive industries invest significantly in reducing the fuel consumption of their products due to the global climate change. The governments and legislations push the companies at first hand to reduce the emissions of their vehicles. To reduce the emissions there are many approaches and all of them are important for the automotive industry. One approach is to switch to a more environmental friendly fuel. Other way is to base the power train on other technologies such as electric or hybrid. To make the existing technology more efficient a lot of work has been done, such as, internal friction has
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1.1 OBJECTIVE: This project aims to employ computer modeling in order to conduct a thorough analysis of current Ashok Leyland bus aerodynamics and for required improvements it provides recommendations too.
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