Determination of Turbulent or Laminar Flow in a Wind Tunnel Experiment
Added on 2019-09-30
8 Pages1931 Words316 Views
|
|
|
Introduction: After the project proposal of the wind tunnel experiment and CFD, this report will provide somemore information about how the data was recorded from a wind tunnel experiment and CFD.Some investigations need to be considered in order to analyze the results.As project proposal of the wind tunnel experiment using CFD simulation tool, the reportarticle demonstrates the detail discussion for wind tunnel experiment and computational fluiddynamic approach. The article demonstrates the analysis approach in order to find results. Asdiscussed in a previous semester for wind tunnel working methodology, the next step is toperform testing and determine to streamline wise flow development and a different pattern offlow while perform testing. The aim of this study to evaluate streamline through a side of thetunnel and enhance significance flow in three dimensions. The flow of fluid could be comparedwith the theoretical aspect of model simulate using fluent approach through computational fluiddynamic tool using ANSYS work batch computer application.The aim of this research is to determine the flow patterns within wind tunnel to obtainusefulness for future research about aerodynamic and behavior of flow patterns. If the researchwill successful as given objective, the Victoria University team may able to test aerodynamicprofile component such as aerofoil, F-1 racing car component design etc. in order to developactual environment, the test data taken for the experiment was almost same. The experimentalapproach uses an actual speed of a racing car and component size, feature and property weretaken as 1:1 ratio. For simplicity, the flow velocity needs to manage in order to maintain theRaynolds number (Wah Yen,2014).1 | Page
Theoretical approach:In fluid dynamics, the fluid behavior change with a change in external applied force, velocityand relevant parameters. According to the study, the steady state of flow is defined as fluiddynamic conditions will not change with respect to time. Whether the fluid property willchange flow with respect to time, the flow of fluid become unsteady. In an experiment of a wind tunnel, the digital manometer place and pilot tube provide at eachlocation. The result indicates the flow of fluid steady as the fluid property was not considerablechange with respect to time. Compressible and incompressible flow: If the density of the fluid does not change with a different condition, the flow of fluid known asincompressible flow e.g. flow of air at low speeds. The fluid flow density changes at thedifferent condition, the flow known as compressible flow. The air flow is considered asincompressible at low speed with an assumption of a speed of sound does not react to thesituation.The speed of sound changes magnitude as traveled through a different medium. The speed ofsound is higher in water medium compare to air medium. In order to identify the actual condition,the flow of air assume incompressible and obtain Mach number.The Mach number is the dimensionless parameter which found from the following equation. MachNumber=SpeedofSoundspeedofobject2 | Page
In a wind tunnel experiment, it was found that the maximum flow of air around 20mrs andobtaining Mach number from this parameters as 0.06. The Mach number indicates that the flow offluid is incompressible within the wind tunnel.Laminar flow and turbulence flow: The flow of fluid or air can categorize in laminar flow or turbulent flow in wind tunnel flowexperiment. The laminar flow found when the flow of fluid is parallel with two layers. Thevelocity magnitude change from a centerline of a tube to an extreme position of tube ends. We canassume that velocity remains zero at the stationary condition and reach the maximum as flowpassed away from the centerline. The magnitude varies from zero to maximum (Breuer, 2018). The flow of fluid called turbulence if the velocity of fluid changes with respect to direction andmagnitude. The following figure demonstrates the flow of fluid laminar or turbulence. Figure: (a) laminar flow profile (b) turbulence flow. As shown in the above figure, the laminar flow creates a parabolic profile whereas turbulence flow develops approximate 7th order power function. The suffix “V” indicates the average velocity of flow. 3 | Page
End of preview
Want to access all the pages? Upload your documents or become a member.
Related Documents