Read Broadband Noise Reduction of a Low-Speed Fan Noise Using Trailing Edge Blowing

Broadband Noise Reduction of a Low-Speed Fan Noise Using Trailing Edge Blowing

National Aeronautics and Space Administration

4.9/5 (30171 ratings)

Description:An experimental proof-of-concept test was conducted to demonstrate reduction of rotor-stator interaction noise through the use of rotor-trailing edge blowing. The velocity deficit from the viscous wake of the rotor blades was reduced by injecting air into the wake from a continuous trailing edge slot. Hollow blades with interior guide vanes create flow channels through which externally supplied air flows from the blade root to the trailing edge. A previous paper documented the substantial tonal reductions of this Trailing Edge Rotor Blowing (TERB) fan. This report documents the broadband characteristics of TERB. The Active Noise Control Fan (ANCF), located at the NASA Glenn Research Center, was used as the proof-of-concept test bed. Two-component hotwire data behind the rotor, unsteady surface pressures on the stator vane, and farfield directivity acoustic data were acquired at blowing rates of 1.1, 1.5, and 1.8 percent of the total fan mass flow. The results indicate a substantial reduction in the rotor wake turbulent velocity and in the stator vane unsteady surface pressures. Based on the physics of the noise generation, these indirect measurements indicate the prospect of broadband noise reduction. However, since the broadband noise generated by the ANCF is rotor-dominated, any change in the rotor-stator interaction broadband noise levels is barely distinguishable in the farfield measurements. Sutliff, Daniel L. Glenn Research Center E-15171, NASA/TM-2005-213814, AIAA Paper 2005-3028We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Broadband Noise Reduction of a Low-Speed Fan Noise Using Trailing Edge Blowing. To get started finding Broadband Noise Reduction of a Low-Speed Fan Noise Using Trailing Edge Blowing, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

Pages: 34

Format: PDF, EPUB & Kindle Edition

Publisher: Createspace Independent Publishing Platform

Release: 2018

ISBN: 1721791930

Description: An experimental proof-of-concept test was conducted to demonstrate reduction of rotor-stator interaction noise through the use of rotor-trailing edge blowing. The velocity deficit from the viscous wake of the rotor blades was reduced by injecting air into the wake from a continuous trailing edge slot. Hollow blades with interior guide vanes create flow channels through which externally supplied air flows from the blade root to the trailing edge. A previous paper documented the substantial tonal reductions of this Trailing Edge Rotor Blowing (TERB) fan. This report documents the broadband characteristics of TERB. The Active Noise Control Fan (ANCF), located at the NASA Glenn Research Center, was used as the proof-of-concept test bed. Two-component hotwire data behind the rotor, unsteady surface pressures on the stator vane, and farfield directivity acoustic data were acquired at blowing rates of 1.1, 1.5, and 1.8 percent of the total fan mass flow. The results indicate a substantial reduction in the rotor wake turbulent velocity and in the stator vane unsteady surface pressures. Based on the physics of the noise generation, these indirect measurements indicate the prospect of broadband noise reduction. However, since the broadband noise generated by the ANCF is rotor-dominated, any change in the rotor-stator interaction broadband noise levels is barely distinguishable in the farfield measurements. Sutliff, Daniel L. Glenn Research Center E-15171, NASA/TM-2005-213814, AIAA Paper 2005-3028We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Broadband Noise Reduction of a Low-Speed Fan Noise Using Trailing Edge Blowing. To get started finding Broadband Noise Reduction of a Low-Speed Fan Noise Using Trailing Edge Blowing, you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

Special Offer | $0.00

Special Offer! | $0.00

Broadband Noise Reduction of a Low-Speed Fan Noise Using Trailing Edge Blowing

Broadband Noise Reduction of a Low-Speed Fan Noise Using Trailing Edge Blowing

More Books

Quieting: A Practical Guide to Noise Control

Quieting: A Practical Guide to Noise Control

Further Analysis of Broadband Noise Measurements for a Rotating Blade Operating with and Without Its Shed Wake Blown Downstream

Further Analysis of Broadband Noise Measurements for a Rotating Blade Operating with and Without Its Shed Wake Blown Downstream

NASA Technical Paper

NASA Technical Paper

Lecture Notes in Rotorcraft Engineering

Lecture Notes in Rotorcraft Engineering

Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Counter-rotating-propeller Configuration

Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Counter-rotating-propeller Configuration

Environmental Technical Manual on the Use of Procedures in the Noise Certification of Aircraft

Environmental Technical Manual on the Use of Procedures in the Noise Certification of Aircraft

Interim Prediction Method for Fan and Compressor Source Noise

Interim Prediction Method for Fan and Compressor Source Noise

Some Observations about the Components of Transonic Fan Noise from Narrow-band Spectral Analysis

Some Observations about the Components of Transonic Fan Noise from Narrow-band Spectral Analysis

Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise

Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise