Jet Engine Test Cell Noise Reduction PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Jet Engine Test Cell Noise Reduction PDF full book. Access full book title Jet Engine Test Cell Noise Reduction by C. A. Kodres. Download full books in PDF and EPUB format.
Author: C. A. Kodres
Publisher:
ISBN: 9781423535324
Category :
Languages : en
Pages : 77
Get Book Here
Book Description
Passive methods for decreasing jet engine test cell noise emissions are evaluated and compared. Such methods have the dual advantages of low cost and simplicity. In addition, the effect on the aerothermal performance of the test cell is minimal. Sound pressure levels were measured in and around test facilities equipped with various devices to further reduce noise. The data were supplemented with parametric studies of noise reduction techniques conducted using a 1/20th scale physical model of the Navy's standard T-10 jet engine test cell. Methods that attack the noise problem from outside and methods that attack the problem from inside the test cell are assessed, including trees and other vegetation, acoustic walls, core busters, and modifications to the exhaust stack. Mounting screens in the path of the jet and increasing the height of the exhaust stack are found to be the most effective.
Author: C. A. Kodres
Publisher:
ISBN: 9781423535324
Category :
Languages : en
Pages : 77
Get Book Here
Book Description
Passive methods for decreasing jet engine test cell noise emissions are evaluated and compared. Such methods have the dual advantages of low cost and simplicity. In addition, the effect on the aerothermal performance of the test cell is minimal. Sound pressure levels were measured in and around test facilities equipped with various devices to further reduce noise. The data were supplemented with parametric studies of noise reduction techniques conducted using a 1/20th scale physical model of the Navy's standard T-10 jet engine test cell. Methods that attack the noise problem from outside and methods that attack the problem from inside the test cell are assessed, including trees and other vegetation, acoustic walls, core busters, and modifications to the exhaust stack. Mounting screens in the path of the jet and increasing the height of the exhaust stack are found to be the most effective.
Author: Norman Doelling
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 212
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
Get Book Here
Book Description
Author: Bonard E. Morse
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
Get Book Here
Book Description
Author: Norman Doelling
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 114
Get Book Here
Book Description
Author: Bonard E. Morse
Publisher:
ISBN:
Category : Jet engines
Languages : en
Pages : 114
Get Book Here
Book Description
There has been a need for summarizing and establishing adequate aerodynamic and thermodynamic design criteria for turbojet engine test cells and ground run-up suppressors. These criteria are discussed and their uses are illustrated by examples of typical design problem solutions. The presence of noise suppression structures can have significant influences upon the operation of the turbojet engine. These influences are enumerated and evaluated with recommendations for establishing maximum acceptable effects. Typical test cell configurations are presented and design criteria are established for providing noise suppression facilities which may be utilized for testing a full size aircraft or an engine by itself. These facilities can be either permanent structures or portable units.
Author: Robert G. Gibson
Publisher:
ISBN:
Category : Jet planes
Languages : en
Pages : 130
Get Book Here
Book Description
Author: R. E. Ballard
Publisher:
ISBN:
Category :
Languages : en
Pages : 89
Get Book Here
Book Description
The successfully demonstrated Coanda/refraction air-cooled exhaust noise suppressor system is applied to the Navy requirement for an effective air-cooled retrofit configuration for the class 'C' test cells (concrete enclosure). The technical approach consists of analytically sizing retrofit components to meet both acoustic ad aerothermodynamic requirements and then testing at one-sixth scale using simulated afterburning engine exhaust to verify the design configuration. Model variations included exhaust stack height, exhaust stack inner flow passage configurations (straight walls and diffuser) and removal of a concrete internal partition wall. Extensive data were recorded and analyzed to identify the aerothermodynamic trends related to these configuration changes. Results present recommendations for an air-cooled Coanda exhaust noise suppression system for retrofit of Navy class 'C' test cells. (Author).
Author: R. E. Ballard
Publisher:
ISBN:
Category :
Languages : en
Pages : 91
Get Book Here
Book Description
The successfully demonstrated Coanda/refraction air-cooled exhaust noise suppressor system is applied to the Navy requirement for effective exhaust noise suppression in jet engine demountable test cells. The technical approach consists of analytical studies and one-sixth scale model tests using simulated afterburning engine exhaust. Revisions are made to the previously developed system to improve noise suppression capability while reducing the system overall size and initial cost. Revisions include moving secondary air inlets to reduce enclosure size and improve cooling, shortening the Coanda surface to provide more acoustically treated exhaust stack and providing variations in exhaust stack configuration such as single and dual acoustic splitters and acoustic wedges up the back wall. Extensive data were recorded and analyzed to identify the aerothermodynamic and acoustic trends related to these configuration changes. Results present recommendations for an air-cooled Coanda/refraction exhaust system for application to demountable test cells. (Author).
Author: EG-1E Gas Turbine Test Facilities and Equipment
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
Book Description
Document provides information on how military/commercial/gas turbine engine test cell/system users may benefit from this unique Coanda/Refraction concept.
