Hydroxyl Tagging Velocimetry for Rocket Plumes

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX08CD52P
Agency Tracking Number: 070025
Amount: $100,000.00
Phase: Phase I
Program: STTR
Awards Year: 2008
Solicitation Year: 2007
Solicitation Topic Code: T9.01
Solicitation Number: N/A
Small Business Information
MetroLaser, Inc.
2572 White Road, Irvine, CA, 92614-6236
DUNS: 188465819
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Thomas Jenkins
 Principal Investigator
 (949) 553-0688
 tjenkins@metrolaserinc.com
Business Contact
 Christina Arnold
Title: Director of Administration
Phone: (949) 553-0688
Email: carnold@metrolaserinc.com
Research Institution
 Vanderbilt University
 Not Available
 110 21st Avenue South, Baker Bldg. #937
Nashville, TN, 37203
 (615) 322-3979
 Domestic nonprofit research organization
Abstract
To address the need for non-intrusive sensors for rocket plume properties, we propose a laser-based velocity diagnostic that does not require seeding, works in high or low temperature flows, and can be used over a broad range of velocities. Hydroxyl tagging velocimetry (HTV) "writes" a line of OH molecules into the flow and interrogates them after a short delay to determine the velocity. Since the markers are molecules, the method measures the gas velocity directly, avoiding errors due to particle drag associated with seeded techniques. The only requirement is that H2O molecules must be present in the flow, which is easily met by most rocket plume applications. Because OH molecules survive at high temperatures for appreciable lifetimes, it is anticipated that the HTV technique will work in even the highest temperature rocket plumes. The proposed diagnostic will provide measurements not obtainable by current methods, and will enable experimental data that can be used for validating computer models for rocket engine performance predictions.

* information listed above is at the time of submission.

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