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Investigation of Temperature Ratio E...

Karam, Sofia.

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

紀錄類型:	書目-電子資源 : 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.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	97 p.
附註:	Source: Masters Abstracts International, Volume: 57-02.
Contained By:	Masters Abstracts International57-02(E).
標題:	Aerospace engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10642306
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. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 97 p.

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

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

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.

ISBN: 9780355516500Subjects--Topical Terms:

1002622
Aerospace engineering.

Investigation of Temperature Ratio Effect on the Low-Frequency Acoustic Spectra of Heated Jets.
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500 $a Adviser: Adrian Sescu.
502 $a Thesis (M.Eng.)--Mississippi State University, 2017.
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.
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