High Temperature Smart Structures for Engine Noise Reduction and Performance Enhancement, Phase II

Metadata Updated: March 22, 2019

Noise mitigation for subsonic transports is a continuing high priority, and recent work has identified successful exhaust mixing enhancement devices (chevrons) that have demonstrated substantial capability for reducing aircraft engine noise in critical takeoff and landing conditions. Existing fixed-geometry chevrons, however, are inherently limited to optimal noise mitigation in a single operating condition and also can impose significant performance penalties in cruise flight. An adaptive geometry chevron using embedded smart structures technology offers the possibility of maximizing engine performance while retaining and possibly enhancing the favorable noise characteristics of current designs. Phase I identified a promising candidate for a variable geometry chevron using high force Shape Memory Alloy (SMA) actuators. Building on coupled CFD/finite element modeling predicting successful performance, subscale demonstration-level actuated chevrons were constructed that yielded the required deflections in both benchtop and low speed wind tunnel tests. Phase I also identified and tested new high temperature SMA (HTSMA) materials technology to enable the devices to operate in both low temperature (fan) and high temperature (core) exhaust flows. The proposed Phase II effort will continue development of this technology and demonstrate extension of this concept to operation at full-scale stiffness levels and at realistic dynamic pressure and temperature conditions.

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Dates

Metadata Created Date August 1, 2018
Metadata Updated Date March 22, 2019

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date March 22, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_6053
Maintainer
TECHPORT SUPPORT
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Datagov Dedupe Retained 20190322035503
Harvest Object Id 6409dbb0-d9ad-485d-bb44-e834059cf6d3
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2007-12-01
Homepage URL https://techport.nasa.gov/view/6053
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash f0df66e5ab8f77161214dbddbac790a90a21d807
Source Schema Version 1.1

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