Time-Resolved Doppler Global Velocimetry for Full-Scale Plume Characterization
Abstract
Proposed is equipment and supplies for purchase to advance the time-resolved Doppler global velocimetry (TRDGV) technology for aeroacoustically-relevant measurements in full-scale afterburning engines operating on the ground. Such measurements are crucial to advancement along the road-map for tactical engine jet noise reduction, an ultimate goal that addresses sailor health and community noise concerns confronting the Navy. The ONR Hot Jet Noise Reduction Basic Research Challenge (BRC, grants N00014-11-1-0754 and N00014-12-1-0803) resulted in a refined measurement technology capable of three velocity component measurements at 32 points in a flow and with frequency resolution of at least 125 kHz (250 kHz repetition). This measurement technique has been applied in lab scale jets at Virginia Tech and is currently being used at NASA Glenn Research Center (GRC) with a measurement region expanded to 7 inches lateral scale. Further up-scaling of the instrumentation is immediately possible, with efforts described herein that would result in fundamental advances in the technology and reduced risk for full-scale applications. Successful continued efforts would provide the first time-resolved view of the correlated flow motions responsible for peak noise radiation in tactical aircraft engine plumes. There are three challenges to applying the instrumentation to full-scale afterburning engines which are to be addressed via the purchase of the proposed equipment. These challenges include 1. Further instrumentation scaling following the lessons learned from the NASA GRC tests 2. Equipment hardening 3. Flow seeding requirements The purchases planned address each of these items, while activities identified to be funded by NAVAIR will provide risk reduction activities for the instrumentation and methods for measurements in the vicinity of tactical aircraft engines. A total of $163, 900 of equipment (lasers, AOMs) is requested along with $35, 000 of supplies (enclosures, optics and mounts, plus $21, 350 indirect) bringing the total budget to $220, 250.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512836
Entities
People
- Kevin Lowe
Organizations
- Office of Naval Research
- United States Navy
- Virginia Tech