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Aerodynamic Analysis of Car body with Aerodynamic Devices to Improve Performance
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1398 Aerodynamic Analysis of Car body with Aerodynamic Devices to Improve Performance V.V.R. MURTHY1, D.K.V. TIRUMALA REDDY2, D. VINAY PRAKASH3, D. SATEESH4, D. ESAKU5 1Associate Professor, Department of Mechanical Engineering, Nadimpalli Satyanarayana Raju Institute of Technology, Visakhapatnam, Andhra Pradesh, India 2,3,4,5 Student, Mechanical Engineering, Nadimpalli Satyanarayana Raju Institute of Technology, Visakhapatnam, Andhra Pradesh, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - This research is about analysis of the effects of different Aerodynamic add on devices on the vehicle to reduce drag and make the vehicle fuel efficient. The 3D model is developed in ANSYS Space claim. Computational fluid dynamics (CFD) is performed tounderstandtheeffectsofthese add on devices. CFD is performed in ANSYS Fluent module. Drag Coefficient, lift coefficient, drag force and lift force are calculated and compared. The results are analyzed and it was observed that optimized body has better drag coefficient and lift coefficient which helps improving the fuel economy and stability of the car. Keywords: Aerodynamics, Drag Coefficient,LiftCoefficient, Computational fluid dynamics, Stream lined body. 1. INTRODUCTION Aerodynamics plays crucial role in Automobile’s performance. Initially, aerodynamics was used in racing to increase performance of the race cars to increase the race pace. But when fuel economy became a factor in road vehicles due to high pricesoffuel, automobilemanufacturers started to make changes to road cars by making them more streamlined and adding diffusers to reduce drag and improve fuel economy. There will be different types of forces acting on a vehicle when it is moving. One of the forces that is acting against the flow of the vehicle is Drag Force. Reduction of thisdragforce helps in making a vehicle more fuel efficient and stable vehicle. The basic formula to calculate the overall drag is given by: So, our aim is to reduce the drag and lift forces acting on the car. We have analyzed 3 different models. Bluff model Streamlined model Streamlined model with diffuser. And the results were noted and due to changes in the shape of the car body the drag reduction was observed which in return will increase the fuel efficiency of the car. 1.1 Computational Fluid Dynamics CFD analysis consists of three main steps: Pre-Processing, Processing and Post-Processing. It is used to simulate fluid flow using computers with accurate results. We have used ANSYS Space Claim to design the Car models and ANSYS Fluent module to analyze the pressure contour, velocity contour, drag coefficient, lift coefficient, drag and lift forces of the models. 1.2 Concept of Streamlining A body is stream lined when the air flow separationislow when compared to a bluff body whose air flow separation is high which causes a lot of pressuredrag.Astreamlinedbody has less pressure drag which in turn results in overall reduction in drag. A stream lined body is sleek and much easier to force such body through a fluid. So, we designed a car model with streamlined shape. 1.3 Diffuser A diffuser, in an automobile, is a curvedsectionofthecarrear which improves the car's aerodynamic properties by improving the transition between the high-velocity airflow underneath the car and the much slower velocity in ambient atmosphere. The aft part of the car is where usually the diffuser is located. The diffuser helpsinmakingtheairflowat the exit is at the same pressure and same speed of the ambient.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1399 2. Analysis 2.1 Bluff Model First the Bluff model was designed and created using ANSYS Space Claim software. a) Geometry Fig -1: Bluff Model Fig -2: Enclosure created around Bluff Model Fig -3: Inlet velocity given as 33 m/s 2.2 Streamlined Model a) Geometry Fig -4: 2D view of Streamlined Model Fig -5: Enclosure Created around Streamlined model Fig -6: Sectional view of car model
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1400 Fig -7: Extra meshing at rounded corners for better results 2.3 Streamlined Model with Diffuser a) Geometry Fig -8: Streamlined Model with Diffuser Fig -9: 3D Model of Streamlined model with Diffuser 3. CFD RESULTS BLUFF MODEL Fig -10: Velocity Contour of Bluff model Fig -11: Pressure Contour of Bluff model Fig -12: Cd plot
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1401 Fig -13: Cl plot STREAMLINED MODEL Fig -14: Velocity Contour of Streamlined Model Fig -15: Pressure Contour of Streamlined Model Fig -16: Cd Plot of Streamlined Model Fig -17: Cl Plot of Streamlined Model STREAMLINED MODEL WITH DIFFUSER Fig -18: Velocity Contour of Streamlined Model with diffuser Fig -19: Pressure Contour of Streamlined Model with diffuser Fig -20: Cd Plot of Streamlined Model with diffuser
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 1402 Fig -21: Cl Plot of Streamlined Model with diffuser Table-1 contains the values of Coefficient of drag (Cd), Coefficient of lift (Cl), drag force and Lift Force of all three models. Bluff Model Streamlined Model Streamlined Model with Diffuser Cd 0.5361 0.3242 0.3369 Cl 0.1540 0.0500 0.1000 Drag 1072.98(N) 612.07(N) 634.719(N) Lift 270.41(N) 4.95(N) 2.615(N) Table -1 From the above information on the basis of Cd, Cl, Lift and Drag Force the Stream lined model’s drag and lift got significantly reducedwhencomparedto bluffmodel.And the stream lined model with diffuser’s lift got reduced slightly which in return increases the stability of the car at high speeds. So, the optimized Shape of stream lined model and diffuser offers better and lesser drag when compared to the other models. This helps in Increase of Fuel economy and also the highspeed stability of the car. CONCLUSIONS From the above study we arrive at the following: Aerodynamics is an important factor to consider while manufacturing a vehicle. Here, in this paper, we created a Stream lined model and analyzed the aerodynamic parameters of the car including the drag produced during high performance. From the analysis performed it is observed that the car with streamlined body’s drag is low but there is small amount of lift is generated. Butthediffuser model’s drag is low and also creates small amount of downforce which increase the grip of the car and provides good traction. This analysis shows the difference between a car with no Aerodynamic devices and car equipped with Aerodynamic devices. The Drag and lift are improved significantly and result will be better fuel efficiency and better highspeed stability. REFERENCES [1] Koike, M., Tsunehisa, N., and Naoki, H., Research on Aerodynamic Drag ReductionbyVortexGenerators, Mitsubishi Motors Tech. Rev., vol. 16, pp. 11–16, 2004. [2] Singh, S.N., Rai, L., Puri, P., and Bhatnagar, A., Effect of Moving Surface on the AerodynamicDragofRoad Vehicles, Proc. Inst. Mech. Eng., Part D, (J. Automob. Eng.), vol. 219, pp. 127–134, 2005. [3] Drag Force and Drag Coefficient, Sadraey M., Aircraft Performance Analysis, VDM Verlag Dr. Müller, 2009. [4] Numerical Study on Aerodynamic Drag Reduction of Racing Cars by S.M. Rakibul Hassan,ToukirIslam, Mohammad Ali, Md. Quamrul Islam, ICME 2013. [5] Methods of Reducing Vehicle Aerodynamic Drag by Upendra S. Rohatgi, Presented at the ASME 2012 Summer Heat Transfer Conference, Puerto Rico, USA.
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