2026-09-20T16:57:59Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/921842022-01-13T07:54:05Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Kripa K. Varanasi.
Hake, Mariah I. (Mariah Inez)
Massachusetts Institute of Technology. Department of Mechanical Engineering.
Massachusetts Institute of Technology. Department of Mechanical Engineering
2014-12-08T18:55:06Z
2014-12-08T18:55:06Z
2014
2014
http://hdl.handle.net/1721.1/92184
897206336
Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 37-38).
The Osney Laboratory sought to create an entropy noise test rig that could determine the relationship between entropy noise and the flow parameters of temperature change and nozzle Mach number. The apparatus simulates entropy noise in an aero engine. In the test rig, compressed air enters an anechoic labyrinth, flows through a settling chamber that straightens airflow, and then goes to the entropy wave generator. The entropy wave generator forms entropy waves through electric heating. Entropy waves are then accelerated in a convergent-divergent nozzle to produce entropy noise. Microphones at the end of the rig detect entropy noise readings as acoustic sound. Air exits through an anechoic termination. The test rig allows for easy changes in temperature and Mach number so variation in entropy noise with different input values can be tested. Project stages include literature compilation, 3D computer-aided design, part revision, material specification, and finally supervision of manufacture.
by Mariah I. Hake.
S.B.
38 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Mechanical Engineering.
Experimental design to determine the effect of temperature and Mach number on entropy noise
Thesis
application/pdf
false
Publication
unknown
unknown
<Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="9d4a7d78-50e2-4481-a80c-86872d390e6c">
<Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type>
<Language>eng</Language>
<Title>Experimental design to determine the effect of temperature and Mach number on entropy noise</Title>
<PublishedIn>
<Publication>
</Publication>
</PublishedIn>
<PublicationDate>2014</PublicationDate>
<Authors>
<Author>
<DisplayName>Hake, Mariah I. (Mariah Inez)</DisplayName>
<Affiliation>
<OrgUnit>
</OrgUnit>
</Affiliation>
</Author>
</Authors>
<Editors>
</Editors>
<Publishers>
<Publisher>
<DisplayName>Massachusetts Institute of Technology</DisplayName>
<OrgUnit />
</Publisher>
</Publishers>
<License>http://dspace.mit.edu/handle/1721.1/7582</License>
<Keyword>Mechanical Engineering.</Keyword>
<Abstract>The Osney Laboratory sought to create an entropy noise test rig that could determine the relationship between entropy noise and the flow parameters of temperature change and nozzle Mach number. The apparatus simulates entropy noise in an aero engine. In the test rig, compressed air enters an anechoic labyrinth, flows through a settling chamber that straightens airflow, and then goes to the entropy wave generator. The entropy wave generator forms entropy waves through electric heating. Entropy waves are then accelerated in a convergent-divergent nozzle to produce entropy noise. Microphones at the end of the rig detect entropy noise readings as acoustic sound. Air exits through an anechoic termination. The test rig allows for easy changes in temperature and Mach number so variation in entropy noise with different input values can be tested. Project stages include literature compilation, 3D computer-aided design, part revision, material specification, and finally supervision of manufacture.</Abstract>
<Access xmlns="http://purl.org/coar/access_right"
>
</Access>
</Publication>