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Investigation of Temperature Ratio Effect on the Low-Frequency Acoustic Spectra of Heated Jets.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Investigation of Temperature Ratio Effect on the Low-Frequency Acoustic Spectra of Heated Jets./
作者:	Karam, Sofia.
面頁冊數:	1 online resource (97 pages)
附註:	Source: Masters Abstracts International, Volume: 57-02.
標題:	Aerospace engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9780355516500

Investigation of Temperature Ratio Effect on the Low-Frequency Acoustic Spectra of Heated Jets.
Karam, Sofia.

Investigation of Temperature Ratio Effect on the Low-Frequency Acoustic Spectra of Heated Jets. - 1 online resource (97 pages)

Source: Masters Abstracts International, Volume: 57-02.

Thesis (M.Eng.)--Mississippi State University, 2017.

Includes bibliographical references

Jet noise remains one of the most important problems in the aviation industry, and its reduction is sought in the context of both commercial and military aircraft. In this thesis, an investigation of the jet noise is conducted in terms of the effect of temperature and Mach number on low frequency acoustic spectra. A low-order model derived from the generalized acoustic analogy method via a low-frequency asymptotic approach is utilized, where the mean flow and pertinent statistical quantities are obtained from RANS simulations. The study involves a combination of seven acoustic Mach numbers ranging from 0.3 to 1.5 and five temperature ratios (TR) ranging from 1 to 3. The model is calibrated with existing experimental measurements of a Mach 0.9 and TR = 1 jet. The results show that the sound pressure level increases with the increase in Mach number, and decreases with the decrease in temperature ratios.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355516500Subjects--Topical Terms:

686400
Aerospace engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Investigation of Temperature Ratio Effect on the Low-Frequency Acoustic Spectra of Heated Jets.
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245 1 0 $a Investigation of Temperature Ratio Effect on the Low-Frequency Acoustic Spectra of Heated Jets.
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500 $a Source: Masters Abstracts International, Volume: 57-02.
500 $a Adviser: Adrian Sescu.
502 $a Thesis (M.Eng.)--Mississippi State University, 2017.
504 $a Includes bibliographical references
520 $a Jet noise remains one of the most important problems in the aviation industry, and its reduction is sought in the context of both commercial and military aircraft. In this thesis, an investigation of the jet noise is conducted in terms of the effect of temperature and Mach number on low frequency acoustic spectra. A low-order model derived from the generalized acoustic analogy method via a low-frequency asymptotic approach is utilized, where the mean flow and pertinent statistical quantities are obtained from RANS simulations. The study involves a combination of seven acoustic Mach numbers ranging from 0.3 to 1.5 and five temperature ratios (TR) ranging from 1 to 3. The model is calibrated with existing experimental measurements of a Mach 0.9 and TR = 1 jet. The results show that the sound pressure level increases with the increase in Mach number, and decreases with the decrease in temperature ratios.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Aerospace engineering. $3 686400
650 4 $a Acoustics. $3 670692
655 7 $a Electronic books. $2 local $3 554714
690 $a 0538
690 $a 0986
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Mississippi State University. $b Aerospace Engineering. $3 1148641
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10642306 $z click for full text (PQDT)