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On the characterization of noise sou...

The Pennsylvania State University.

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On the characterization of noise sources in supersonic shock containing jets.

Record Type:	Electronic resources : Monograph/item
Title/Author:	On the characterization of noise sources in supersonic shock containing jets./
Author:	Veltin, Jeremy.
Description:	256 p.
Notes:	Adviser: Dennis K. McLaughlin.
Contained By:	Dissertation Abstracts International70-02B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3346385
ISBN:	9781109016000

On the characterization of noise sources in supersonic shock containing jets.
Veltin, Jeremy.

On the characterization of noise sources in supersonic shock containing jets. - 256 p.

Adviser: Dennis K. McLaughlin.

Thesis (Ph.D.)--The Pennsylvania State University, 2008.

Research on the noise produced by military aircraft has seen a renewed interest due to the increasing concerns of communities around airbases and airports. Radiated noise associated with high-speed military style engines is the main contributor of the overall noise produced by modern aircraft, especially in military applications where the jets typically are at very high velocity and temperature, and have low bypass ratios. The acoustic and aerodynamic properties of high-speed jets are investigated experimentally in this thesis. Measurements are conducted in the Penn State high speed jet noise facility, after the validation of the newly upgraded rig. Axisymmetric Nozzles are investigated as well as nozzles with a military style shape.

ISBN: 9781109016000Subjects--Topical Terms:

1018395
Engineering, Aerospace.

On the characterization of noise sources in supersonic shock containing jets.
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020 $a 9781109016000
035 $a (UMI)AAI3346385
035 $a AAI3346385
040 $a UMI $c UMI
100 1 $a Veltin, Jeremy. $3 1030541
245 1 0 $a On the characterization of noise sources in supersonic shock containing jets.
300 $a 256 p.
500 $a Adviser: Dennis K. McLaughlin.
500 $a Source: Dissertation Abstracts International, Volume: 70-02, Section: B, page: 1155.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2008.
520 $a Research on the noise produced by military aircraft has seen a renewed interest due to the increasing concerns of communities around airbases and airports. Radiated noise associated with high-speed military style engines is the main contributor of the overall noise produced by modern aircraft, especially in military applications where the jets typically are at very high velocity and temperature, and have low bypass ratios. The acoustic and aerodynamic properties of high-speed jets are investigated experimentally in this thesis. Measurements are conducted in the Penn State high speed jet noise facility, after the validation of the newly upgraded rig. Axisymmetric Nozzles are investigated as well as nozzles with a military style shape.
520 $a The database of flow measurements in supersonic shock containing jets is very scarce. This research focuses on performing flow measurements in shock containing jets in an effort to obtain valuable parameters for the modeling of the noise propagated by such flows. Mean flow measurements of the jets are performed with pitot probes traversing the flow. These measurements are used as a qualification tool for a CFD simulation of the flow field with good overall agreement. Measurements in supersonic rectangular jets also uncover the presence of axes switching in fully, over- and under-expanded cases, with the location of this axes switch being further downstream in the fully expanded case. Acoustic data are gathered in shock containing screeching jets. Different techniques are investigated in order to provide some reduction of the screech tones. Optical Deflectometry measurements are performed in shock containing jets and show that the screech tones have no effect on the properties of the convecting structures. On the other hand, the strength of the shock present in the flow seems to have an effect on the convection velocity. Finally, the simultaneous correlation between the flow field fluctuations and the acoustic far field is measured. This suggests that the OD sensors can be used for localizing the noise generation in the jet. Preliminary results of this kind show that the highest frequencies are generated close to the exit plane of the nozzle.
590 $a School code: 0176.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Physics, Acoustics. $3 1019086
650 4 $a Physics, Fluid and Plasma. $3 1018402
690 $a 0538
690 $a 0759
690 $a 0986
710 2 $a The Pennsylvania State University. $3 699896
773 0 $t Dissertation Abstracts International $g 70-02B.
790 $a 0176
790 1 0 $a McLaughlin, Dennis K., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3346385