Experimental Investigation of Aerodynamic Interactions of Vehicles in Close Folowing and Passing Situations

Download

index.pdf

Date

2006

Author

Gümüşlüol, Ünsal

Metadata

Show full item record

Item Usage Stats

282
views

280
downloads

In this Thesis study, aerodynamic interactions of vehicle models in close following and passing situations were investigated expeimentally. Effect of the inter-vehicle spacing and lateral distance on drag coefficients of two close-following vehicles were observed. Two different types of vehicle models were used in order to investigate the shape effect on aerodynamic vehicle interactions. Drag froces and surface pressures of the models at each situation were measured. Two different blockage correction methods on the basis of drag coefficient results were applied. Linear increments of drag coefficients were observed on leading and trailing MIRA models. Beacuse of their blunter shapes and sharp edges, the leading and trailing Ahmed Body models feel the presence of aerodynamic interactions substantially. The most important reduction in drag force occurs at the least vehicle spacing for both vehicle types. In the passing situations, it was observed that drag coefficients of MIRA models did not change considerably. However, big amount of changes were observed at all positions for Ahmed Body. Maximum values of drag coefficients were reached when the models were at side by side position for both vehicle types. In conclusion, it is possible to obtain more drag reductions with more numbers of vehicles in close-following. the lower drag coefficients in close-following operations caues to increase fuel savings and to reduce air pollution.

Subject Keywords

Mechanical Engineering.

URI

http://etd.lib.metu.edu.tr/upload/2/12607287/index.pdf
https://hdl.handle.net/11511/15924

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Computation of drag force on single and close-following vehicles Örselli, Erdem; Çetinkaya, Tahsin Ali; Department of Mechanical Engineering (2006) In this study, application of computational fluid dynamics to ground vehicle aerodynamics was investigated. Two types of vehicle models namely, Ahmed Body and MIRA Notchback Body and their scaled models were used. A commercial software "Fluent" was used and the effects of implementing different turbulence models with wall functions were observed. As a result, an appropriate turbulence model was selected to use in the study. The drag forces, surface pressure distributions and wake formations were investigate...
Design and performance evaluation of a fuel filter Ayrancı, Hakan; Albayrak, Kahraman; Department of Mechanical Engineering (2010) This thesis analyzes design criteria’s, performance evaluation of fuel filter. Fundamental concepts, definition and systems has been discussed at literature survey parts. Fundamentals of filter design tests and calculations are discussed. In Addition Frequency and amplitude effect on fuel filter efficiency investigated with different particle sizes by preparing special test set up. Test results has been analyzed by using Regression, Anova and Analyze of Variance methods with Minitab software.
Computer aided engineering of an unmanned underwater vehicle Cevheri, Necmettin; Aksel, Mehmet Haluk; Department of Mechanical Engineering (2009) Hydrodynamic and thermal analyses performed during the conceptual design of an unmanned underwater vehicle are presented in this study. The hull shape is determined by considering alternative shapes and the dimensions are determined from the internal arrangement of components. Preliminary thermal analyses of the watertight section are performed with a commercial software called FLUENT to check the risk of over-heating due to the heat dissipation of devices. Performance of the proposed hull design is analyze...
Experimental determination of transfer functions for a car body-in-white Şentürk, Sabri; Ünlüsoy, Yavuz Samim; Department of Mechanical Engineering (2004) Vibration generated from various sources (engine, road surface, tires, exhaust, etc.) should be considered in the design of a car body. These vibrations travel through transfer systems (drivetrain, suspension, body, etc.) to the steering wheel, seats and other areas where it is detected by the passengers of the vehicle. Transmission routes must be studied and efforts made to keep transfer systems from amplifying vibration and to absorb it instead. Since the superior vibration transfer system is the car body...
Implementation of turbulence models into a Navier-Stokes solver Muşta, Mustafa Nail; Aksel, Mehmet Haluk; Department of Mechanical Engineering (2004) In order to handle turbulent flow problems, one equation turbulence models are implemented in to a previously developed explicit, Reynolds averaged Navier-Stokes solver. Discretization of Navier-Stokes solver is based on cell-vertex finite volume formulation combined with single step Lax-Wendroff numerical method which is second order accurate in space. Turbulent viscosity is calculated by using one equation Spalart-Allmaras and Baldwin-Barth turbulence transport equations. For the discretization of Spalart...

Citation Formats

Ü. Gümüşlüol, “Experimental Investigation of Aerodynamic Interactions of Vehicles in Close Folowing and Passing Situations,” M.S. - Master of Science, Middle East Technical University, 2006.