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Can Water-Injected Turbomachines Provide Cost-Effective Emissions and Maintenance Reductions?An investigation has been performed to evaluate the effect of water injection on the performance of the Air Force Research Laboratory (AFRL, Wright-Patterson Air Force Base (WPAFB)) experimental trapped vortex combustor (TVC) over a range of fuel-to-air and water-to-fuel ratios. Performance is characterized by combustor exit quantities: temperature and emissions measurements using rakes, and overall pressure drop, from upstream plenum to combustor exit. Combustor visualization is performed using gray-scale and color still photographs and high-frame-rate videos. A parallel investigation evaluated the performance of a computational fluid dynamics (CFD) tool for the prediction of the reacting flow in a liquid fueled combustor (e.g., TVC) that uses water injection for control of pollutant emissions and turbine inlet temperature. Generally, reasonable agreement is found between data and NO(x) computations. Based on a study assessing the feasibility and performance impact of using water injection on a Boeing 747-400 aircraft to reduce NO(x) emissions during takeoff, retrofitting does not appear to be cost effective; however, an operator of a newly designed engine and airframe might be able to save up to 1.0 percent in operating costs. Other challenges of water injection will be discussed.
Document ID
20110012888
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Hendricks, Robert C. (NASA Glenn Research Center Cleveland, OH, United States)
Daggett, David L. (Boeing Commercial Airplane Group Seattle, WA, United States)
Shouse, Dale T. (Air Force Research Lab. Wright-Patterson AFB, OH, United States)
Roquemore, William M. (Air Force Research Lab. Wright-Patterson AFB, OH, United States)
Brankovic, Andreja (Flow Parametrics, LLC Ivoryton, CT, United States)
Ryder, Robert C., Jr. (Flow Parametrics, LLC Ivoryton, CT, United States)
Date Acquired
August 25, 2013
Publication Date
May 1, 2011
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
141-ISROMAC-11
NASA/TM-2011-214039
E-15396-2
Meeting Information
Meeting: 11th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
Location: Honolulu, HI
Country: United States
Start Date: February 26, 2006
End Date: March 2, 2006
Funding Number(s)
WBS: WBS 561581.02.08.03.16.03
Distribution Limits
Public
Copyright
Public Use Permitted.

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