International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN (P): 2249–6890; ISSN (E): 2249–8001 Vol. 10, Issue 2, Apr 2020, 1353–1364 © TJPRC Pvt. Ltd.
ANALYSIS OF CD AND CL FOR A CAR BY USING ANSYS 15.0 AMIT KUMAR PANIGRAHY1*, TAPANO KUMAR HOTTA2, SHAIK AHAMMAD BASHA3 & MATTAPARTHI LAKSHMANA VEERABABU4 1,3,
Assistant Professor, Department of Mechanical Engineering, Rajiv Gandhi University of Knowledge Technologies Nuzvid Nuzvid, Krishna, Andhra Pradesh, India 4
2
B.TECH Student, Department of Mechanical Engineering RGUKT Nuzvid, Andhra Pradesh, India
Associate Professor, Department of Mechanical Engineering, Vellore institute of Technology, Vellore, Katpadi, Tamil Nadu, India
ABSTRACT The increasing use of passenger vehicles invites a serious discussion regarding environmental issues such as CO2 emission; this is one of the critical problems faced by current generation and the other issue is raising fuel price. Aerodynamic drag is mostly responsible for fuel consumption and CO2 emission (more drag, more fuel consumption and hence more CO2 emission). Around 60-65% of drag is because of exterior and under body of the passenger vehicle, and needs to have minimum for better stability. Current days, it is not preferable to do experiments and obtain aerodynamic results like CD and CL in connection with cost point of view, instead people prefer commercial software like Ansys to do aerodynamic analysis by using CFD, which is much cheaper compared to experiments. This paper first investigated coefficient of drag and lift for a BMW-M6-COUPE-2012 base model by using Ansys 15.0 and then investigated the effect of under body diffuser on CD and CL, different angles of diffuser starting from different locations (one set of angles starts 15mm from the rear end of the vehicle, one set of angles 30 mm from the rear end of the vehicle and another set of angles
Original Article
remaining is due to wheels and cooling flows. Aerodynamic lift is also important for stability of a passenger car which
starts 50 mm from the rear end) were investigated. It is observed that using under body diffuser decreases both C D and CL significantly compared with base model. Many researchers studied effect of under body diffuser on C D and CL , but this paper attempts to give a relation between CD and CL and diffuser angles starting from different locations. KEYWORDS:
Received: Feb 12, 2020; Accepted: Mar 02, 2020; Published: Apr 17, 2020; Paper Id.: IJMPERDAPR2020129
1. INTRODUCTION The need of personal comfort gives raise to the use of passenger vehicles, hence production of passenger vehicle has increased, and in turn increased the pollution level. This increased production of vehicles raises a serious concern regarding environmental pollution and fuel price hike. Figure 1 shows the production statistic of vehicles for the past 20 years. In order to reduce the pollution, fuel consumption per vehicle needs to be reduced and hence coefficient of drag of every vehicle needs to be reduced.
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