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Characterization and Validation of an Anechoic Facility for High-Temperature Jet Noise Studies

Title: Characterization and Validation of an Anechoic Facility for High-Temperature Jet Noise Studies.
Name(s): Craft, Joseph Michael, author
Alvi, Farrukh S., professor directing thesis
Kumar, Rajan, committee member
Collins, Emmanuel G., committee member
Florida State University, degree granting institution
College of Engineering, degree granting college
Department of Mechanical Engineering, degree granting department
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2016
Publisher: Florida State University
Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (174 pages)
Language(s): English
Abstract/Description: In response to the increasing demand for jet noise studies performed at realistic conditions, the Florida Center For Advanced Aero-Propulsion at Florida State University has recently brought online an upgraded Anechoic High-Temperature Jet Facility. The function of this facility is to accurately simulate and characterize the aeroacoustic properties of exhaust from jet engines at realistic temperatures and flow speeds. This new addition is a blow-down facility supplied by a 3500 kPa, 114 cubic meter compressed dry air system and a sudden-expansion ethylene burner that is capable of producing ideally expanded jets up to Mach 2.6 and stagnation temperatures up to 1500 K. The jet exhausts into a fully anechoic chamber which is equipped to acquire acoustic and flow measurements including the temperature and pressure of the jet. The facility is capable of operating under free jet as well as in various impinging jet configurations pertinent to sea- and land-based aircraft, such as the F-35B. Compared to the original facility, the updated rig is capable of longer run times at higher temperatures. In this paper we demonstrate the facility's experimental capabilities and document jet aeroacoustic characteristics at various flow and temperature conditions. The anechoic chamber was characterized using ISO (3745:2003) guidelines and the lower cutoff frequency of the chamber was determined to be 315 Hz. Aeroacoustic properties of jets operating at subsonic conditions and supersonic Mach numbers ranging from 1.2 to 2.1 at temperatures of ~300 K to ~1300 K are documented. Where available, very good agreement was found when the present results were compared with data in the jet noise literature.
Identifier: FSU_FA2016_Craft_fsu_0071N_13535 (IID)
Submitted Note: A Thesis submitted to the Department of Mechanical Engineering in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Fall Semester 2016.
Date of Defense: November 11, 2016.
Keywords: Acoustics, aerospace, Engineering, Facility Validation, FCAAP, Supersonic
Bibliography Note: Includes bibliographical references.
Advisory Committee: Farrukh Alvi, Professor Directing Thesis; Rajan Kumar, Committee Member; Emmanuel Collins, Committee Member.
Subject(s): Mechanical engineering
Aerospace engineering
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Host Institution: FSU

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Craft, J. M. (2016). Characterization and Validation of an Anechoic Facility for High-Temperature Jet Noise Studies. Retrieved from