Dynamic Transfer Function Measurements for Cavitating Pumps

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NAS8-03006
Agency Tracking Number: 023265
Amount: $69,996.00
Phase: Phase I
Program: SBIR
Awards Year: 2003
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Concepts ETI, Inc.
217 Billings Farm Road, White River Jct, VT, 05001
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Daniel Baun
 (802) 296-2321
Business Contact
 Penny Palmer
Title: Business Official
Phone: (802) 296-2321
Email: pjp@conceptsnrec.com
Research Institution
There are no analytical tools or experimental facilities in the world today that can quantify the dynamic transfer function for a cavitating inducer. The goal of this research is to fill this void. An innovative experimental technique is proposed where by a cavitating inducer's dynamic transfer function is quantified by mapping the flow and pressure fluctuations at the inducer exit as a function of harmonic perturbations at the inlet. A cavitating inducer can be a source of instability in a rocket engine. Due to cavitation dynamics, inlet flow perturbations maybe amplified by the inducer resulting in very large flow and pressure fluctuations in the fuel system. The resulting dynamic couplings can lead to vehicle instability (POGO) as well as generate intense dynamic loadings on the turbopump. The feasibility of implementing the technique on the Concepts NREC water flow test rig will be demonstrated in Phase I of the project. Implementation of the technique and inducer transfer function identification will occur in Phase II. The proposed dynamic transfer function characterization methodology is applicable to any high energy density turbomachine subject to impeller induced flow instabilities, such as boiler feed pumps or re-injection pumps and compressors.

* information listed above is at the time of submission.

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