Description:
Background:
Screens are utilised upstream of a wind tunnel contraction to produce a more uniform flow in the test section and to control/reduce the background free-stream turbulence level. A widely adopted “rule-of-thumb” for screen selection is that the open-area ratio should be greater than 57%, otherwise it is claimed that the jets flowing through the openings in the screen will coalesce and create local regions of non-uniform and unsteady flow, which defeats the purpose of using the screen. However, the only evidence for jet coalescence appearing in the literature is for the flow through a 2D array of wires, i.e. a zither.
Project Outline:
The project will involve a CFD investigation, with the possibility of a combined experimental investigation to be conducted in the DSTO water tunnel.
The CFD investigation will use a screen constructed of square rods to simplify creation of the CFD mesh. The Reynolds number will be sufficiently small to ensure a steady flow. Significant effort will be required with the CFD mesh to incorporate spatial variations that are representative of the imperfections associated with physical screens. Access to a high performance cluster with up to 128 processors will be made available if the work evolves to this level. Some prior experience with CFD is recommended before attempting this project.
The experimental investigation will involve hydrogen bubble flow visualization downstream of screens in the DSTO Water Tunnel to search the flow field for evidence of coalescence of jets. DSTO personnel have expressed strong support for the project but access to the tunnel will be dependent on security clearance. If security clearance is granted then the experimental work will involve the design and construction of suitable stainless steel frames to support the stainless steel screen cloth, which will be selected and purchased by university. A number of screens will be studied with approximately the same wire diameter but different open area ratios. It is anticipated that access to the DSTO water tunnel would be provided for a one week period during each semester. Various techniques will be used to analyse the flow visualization images following the tests.
Coalescence of jets is research topic of considerable world-wide interest and significant CFD and/or experimental results will lead to journal publication.
Key words:
Wind-Tunnel, Screens, Turbulence, Flow Quality.
Requirements:
Background experience with CFD.
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I want that in “Engineering Journal proposal style” with proper citation,citation would be number perfect instead of you giving name of the author and year. I don’t want this is in thesis style.mine is full journal style.
My proposal title:
“Coalescence of Jets in the Flow through Wind Tunnel Screens”
Description:
Screens are utilised upstream of a wind tunnel contraction to produce a more uniform flow in the test section and to control/reduce the background free-stream turbulence level. A widely adopted “rule-of-thumb” for screen selection is that the open-area ratio should be greater than 57%, otherwise it is claimed that the jets flowing through the openings in the screen will coalesce and create local regions of non-uniform and unsteady flow, which defeats the purpose of using the screen. However, the only evidence for jet coalescence appearing in the literature is for the flow through a 2D array of wires, i.e. a zither.
Project Outline:
The project will involve a CFD investigation, with the possibility of a combined experimental investigation to be conducted in the DSTO water tunnel.
The CFD investigation will use a screen constructed of square rods to simplify creation of the CFD mesh. The Reynolds number will be sufficiently small to ensure a steady flow. Significant effort will be required with the CFD mesh to incorporate spatial variations that are representative of the imperfections associated with physical screens. Access to a high performance cluster with up to 128 processors will be made available if the work evolves to this level. Some prior experience with CFD is recommended before attempting this project.
The experimental investigation will involve hydrogen bubble flow visualization downstream of screens in the DSTO Water Tunnel to search the flow field for evidence of coalescence of jets. DSTO personnel have expressed strong support for the project but access to the tunnel will be dependent on security clearance. If security clearance is granted then the experimental work will involve the design and construction of suitable stainless steel frames to support the stainless steel screen cloth, which will be selected and purchased by university. A number of screens will be studied with approximately the same wire diameter but different open area ratios. It is anticipated that access to the DSTO water tunnel would be provided for a one week period during each semester. Various techniques will be used to analyse the flow visualization images following the tests.
Coalescence of jets is research topic of considerable world-wide interest and significant CFD and/or experimental results will lead to journal publication.
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