Aerodynamics Study Of Co2 Car Design - IJERT
Published by :http://www.ijert.orgInternational Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 5 Issue 08, August-2016“Aerodynamics Study of Co2 Car Design”Anjappa SB1, Satish Shegedar2, G Naveen Raju3, Vinay Thallapally4.Asst ProfessorMechanical Engineering DepartmentSree Chaitanya College of engineering,Karimnagar Telangana India.Abstract— when objects pass through air, forces are produced byvirtual motion between the air and surfaces of the object.Aerodynamics is the education of these forces, generated bymeans of the motion of air, commonly aerodynamics are takeninto consideration rendering to the kind of flow as subsonic,hypersonic, supersonic and so forth. This take a look at isaccomplished at the scaled model of the dragster race car,because the dragster wishes extra space & substantial value toconstruct and test the identical, to reduce the cost and speedupthe refinement manner, we have carried out this study on theminiature model of the car and tested with the wind loading of57MPH to analyse the wind loading and the obstruction in thepath of movement.The initial study is performed at the primary geometry of thecar to test the drift parameters. The second take a look at isfinished on the subtle model of the car, ensuring all of theuncovered corners are rounded to avoid obstruction of air andmake certain clean waft of the air. Drag and lift parameter isbasically reduced in this look at because of the change inside thebody layout and addition of curves and drafts on the flow surfaceof the Co2 car surface.Key Points: Race Car, Dragster, Co2, Solid Works.1. INTRODUCTIONAn essential thought in outlining a car is aeromechanics. Thestudy of air is the effect of wind current and the powersincluded whilst an article travels thru the air or when airmoves past an object. Flight technological know-how hastackled new importance since the requirement for more fuelproductive vehicles. An inadequately composed vehicle makesuse of greater fuel. The flow of air shifting round a car iscalled streamline. A body with a preferred adjusted orrectangular form will bring about air to split a ways from thestreamline into whirls of air. This uneven or turbulent airimprovement with the intention to ease the vehicle off isknown as drag. Vehicles have much less resistance on the offhazard that they are adjusted inside the front and reduced to adegree in the again (teardrop shape). In this motion, you willdefine, develop, and check an aero robotically stable car. Theauto you'll be building is similar to a smaller than expectedrocket fuelled hot rod. As you manufacture your warm rod,take as a whole lot time as required. It’s going to have anadvanced opportunity of looking exceptional and going quickat the off hazard that you assemble it with tolerance andconsideration. One noteworthy slip-up can spoil the entire hotrod and forestall you from dashing Take pleasure on yourwork and attempt to make the fine dragster inside theelegance.IJERTV5IS080252In this section a few fundamental air motion optimizedrequirements and their applications to aircraft aeromechanicswill be mentioned. During the talks in this element the windcirculation might be considered as unfaltering. This means thatall flow properties, as an example, weight, speed, temperatureand thickness are concept to be free of tome. But in a littledistrict near to the plane surface, in which consistency isimperative, the wind current will likewise be notion to be nongooey or in viscid.2.PROBLEM DEFINATION AND SCOPE OF PRESENTWORK.2.1 ObjectivesAnalysis will be carried out using solid works software topredict air flow parameters and drag on the component byconsidering external flow simulation at 57MPH.2.2 Methodology From the literature background the gap in a paper isto design and study of aerodynamics co2 car. Thiswill be considered has the objective of this work. Solid works software is used for modelling, meshingand analysis of the c s on a element, as per ASTM standards. Analyzing the airflow of car and predicting twoparameters, drag and lift. Finally predicting reduction in drag component,under different surfaces. Correlating both results.2.3 ScopeOur scope of the project is to study the aerodynamic flow ofthe air and the drag forces during the travel of the car at highspeeds.Considerations for the study.1.2.3.4.5.Speed @ 57MPhCar body is designed to have curvatures and angledsurfaces to the direction of travel.Gravity and wind force at normal atmosphere isconsidered.Self-weight of the car is also considered.The flow characteristic results show the aerodynamicparameters and the drag if any in this study.www.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)340
Published by :http://www.ijert.org3.International Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 5 Issue 08, August-2016RESULTS AND DISSUASIONS4.1.1Ambient conditionThermodynamic parametersVelocity parametersTurbulence parametersStatic pressure : 101325paTemperature 293.26 KVelocity vectorVelocity in X direction : 0 mile\hVelocity in Y direction : 0 mile\hVelocity in Z direction : 55.0000000 mile\hTurbulence intensity and lengthIntensity : 0.10%Length : 8.337e-004m4.2 Input DataFig: 3.1 basic model of co2 car Model information - Optimised designCurrent configuration – 57mphThe initial design was having sharp edge faces and facesintersecting into corners, which are aiding the directobstruction of the air flow during motion.ModelProject pathUnit systemAnalysis typeCoordinate systemReference axisCo2 car assy-old SLDASMF:\SCCE2016\CO2carprojectSI (m-kg-s)ExternalGlobal Coordinate systemZ4. MESHING GEOMETRY4.2.1 Initial mesh setting Automatic initial mesh :on Result resolution level : 4 Advanced narrow channel refinement : off Refinement in solid region : off4.2.2 Geometry resolution Evaluation of minimum gap size : automatic Evaluation of minimum wall thickness : automatic4.3 Computational domainX minX maxY minY maxZ minZ max00.274 m-0.228m0.304m0.546m0.381m4.4 Calculation control options Finish conditionsFinish conditionsMaximum travelsGoals convergenceIf one is satisfied4Analysis interval : 5e-0014.5 RESULTS4.5.1 General info Iteration: 138 CPU time: 221s4.5.2 Calculation mesh Basic mesh dimensions-oldFig: 4 meshing geometry of ccar model4.1BOUNDARY CONDITIONS2D Plane flowNoneAt X minSymmetryAt X maxDefaultAt Y minDefaultAt Y maxDefaultAt Z minDefaultAt Z maxDefaultIJERTV5IS080252Number of cells in XNumber of cells in YNumber of cells in Z1940744.6 Number of cellsTotal cellsFluid cellsSolid cellsPartial cellsIrregular cellsTrimmed cellswww.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)572275610930980900341
Published by :http://www.ijert.orgInternational Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 5 Issue 08, August-20164.7 Maximum refinement level: 14.7.1 GoalsNameValueProgressUse 00.2089610.2255Drag12.043LiftOn1004.8 Min /Max TableNamePressure [pa]Temperature [K]Density (fluid) [kg/m3)Velocity [mile/h]Velocity X [mile/h]Velocity Y [mile/h]Velocity Z [mile/h]Temperature (fluid )[K]Mach numberVortices [1/s]Shear stress [pa]Relative pressureHeat transfer 293.8500.0440-369.7700.0914555.5414.24642.2304.9 Engineering DatabaseGasesAirPath: gases pre-definedSpecific heat ratio (cp/cy): 1.399Molecular mass: 0.0290kg/molFig: 4.9 specific heat of the modelFig: 4.9 Thermal conductivity of the model4.10 Wind pressure of geometryFig: 4.10.1 wind pressure on the body surface is maximum 101519.01 [pa]Fig: 4.9 Dynamic viscosity of modelFig: 4.10.2 this figure shows air is gets deflected because of the slop at thetop.IJERTV5IS080252www.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)342
Published by :http://www.ijert.orgInternational Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 5 Issue 08, August-2016 Air at bottom is being aspirated by front flat surfaceas it flows below vehicle and vacuum is created atback because of the flat rear end. Back side car is created cavity it will reduce carspeed. This design of car requires more fuel consumption. This type of car design is not safety because haven’tstability handling.5. ASSUMPTIONS ORIGINAL MODELS5.2 Calculation mesh5.2.1 Basic mesh dimensionsNumber of cells in XNumber of cells in YNumber of cells in Z1218595.3 Number of cellsTotal cellsFluid cellsSolid cellsIrregular cellsPartial cellsTrimmed cells1352812691152068505.4 Maximum refinement level: 1Nam Unit Valu Progr Use ineeessconvergenceDrag p-26.100On529LiftFig: 5 Original models Vehicle running at 57mph Check for air flow condition External flow parameter study5.1 Boundary Conditions2D Plane flowNoneAt X minSymmetryAt X maxDefaultAt Y minDefaultAt Y maxDefaultAt Z minDefaultAt Z maxDefault5.1.1 Ambient conditionThermodynamic parametersVelocity parametersTurbulence parametersIJERTV5IS080252Static pressure : 101325.00paTemperature : 293.20 KVelocity vectorVelocity in X direction :0 mile /hVelocity in Y direction :0 mile /hVelocity in Z direction : 55.000000mile/hTurbulence intensity and lengthIntensity : 0.10%Length :8.337e-004mp-3.8225.5 Max/Min TableNamePressure [pa]Temperature [K]Density (fluid)[kg/m3)Velocity [mile/h]Velocity X[mile/h]Velocity Y[mile/h]Velocity Z[mile/h]Temperature (fluid) [K]Mach numberVortices [1/s]Shear stress [pa]Relative pressureHeat transfercoefficient[w/m2/K]Surface heat 6000-374.9100.083308.6414.271798.280005.6 Engineering database AirPath: gases pre-definedSpecific heat ratio (cp/cv): 1.399Molecular mass: 0.0290 kg/molwww.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)343
Published by :http://www.ijert.orgInternational Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 5 Issue 08, August-2016Fig: 5.6.1 dynamic viscosity of the modelFig: 4. 7.2 Flow simulation of Co2 car design Reduce the fuel consumption. Reduce the drag and lift rate. Improvement of driving characteristics. Increasing speed and efficiency of the car.5.8 surface pressure [pa]Fig: 5.6.2 specific heat of the modelFig: 5.8.1 3-D view of surface pressure [pa]Fig: 5.6.3 Thermal conductivity of the model5.7 Flow simulation of Co2 car designFig: 5.8.2 Side view of surface pressure [pa]Fig: 4. 7.1 Flow simulation of Co2 car designIJERTV5IS080252www.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)344
Published by :http://www.ijert.orgInternational Journal of Engineering Research & Technology (IJERT)ISSN: 2278-0181Vol. 5 Issue 08, August-20166. COMPARISON FOR OLD DESIGN AND NEW DESIGN.BIOGRAPHIESOLD DESIGNLift & drag is maximumGoal nameUnitValueDragp-32.8242701Liftp-12.0434561NEW DESIGNlift & drag is minimumGoalnameUnitDragValue-26.59619726Anjappa SB he main author is anAsst. Professor in Mechanical Engineering Department, SreeChaitanya College of Engineering Telangana India. He got hisM. Tech in Thermal Engineering from visvesvarayaTechnological University Karnataka India,pLiftp-3.9166943027. CONCLUSION & FUTURE SCOPEDrag and lift parameter is largely reduced in this study due tothe change in the body design and addition of curves anddrafts on the flow surface of the Co2 Car surface.Further the study can be optimised for better results by furthermodifying the body and/or adding the aerofoil at the tail endand/or changing the rear end geometry to have a flowdirectional curved shape.Satish Shegedar is a post-graduate inMachine Design JNTU Hyderabad Telangana India; Author iscurrently working as an assistant professor in the Departmentof Mechanical Engineering, sree Chaitanya College ofengineering TelanganaREFERENCES[1][2][3][4][5][6]Jump up [1] Tuncer Cebeci, Jian P. Shao, Fassi Kafyeke, EricLaurendeau, Computational Fluid Dynamics for Engineers: From Panelto Navier-Stokes, Springer, 2005, ISBN 3-540-24451-4Jump up Proceedings: Institution of Mechanical Engineers (GreatBritain). Automobile Division: Institution of Mechanical Engineers,Great Britain (1957)Jump up C. Michael Hogan & Gary L. Latshaw, The relationshipbetween highway planning and urban noise, Proceedings of the ASCE,Urban Transportation Division specialty conference, May 21/23, 1973,Chicago, Illinois. by American Society of Civil Engineers. UrbanTransportation DivisionJump up Larry Mayfield (c. 2013), Index to Coefficient of Drag forMany Vehicles Plus Index to Horsepower vs Speed CurvesJump up "Volkswagen CarScene TV: Volkswagen XL1 - Vision wirdRealität (in german)". Youtube.com. 2011-02-03. Retrieved 2013-06-19.Jump up "Background Research." Automobile Aerodynamics. 18 May2008.DHS.18May2009 .htm .G Naveen Raju is a post-graduate inEngineering Design JNTU Hyderabad Telangana India; Authoris currently working as an assistant professor in the Departmentof Mechanical Engineering, sree Chaitanya College ofengineering TelanganaVinay Thallapally is a Master ofScience in Mechanical Engineering Bridgeport University inUSA; Author is currently working as an assistant professor inthe Department of Mechanical Engineering, sree ChaitanyaCollege of engineering TelanganaIJERTV5IS080252www.ijert.org(This work is licensed under a Creative Commons Attribution 4.0 International License.)345
Aerodynamics is the education of these forces, generated by means of the motion of air, commonly aerodynamics are taken into consideration rendering to the kind of flow as subsonic, hypersonic, supersonic and so forth. This take a look at is a
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