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TITLE AND SUBTITLE: A Reduced Model for Prediction of Thermal and Rotational Effects on Turbine Tip Clearance
AUTHOR(S): Kypuros, Javier, A.; Melcher, Kevin, J.
REPORT DATE: 2003-03-xx
FUNDING NUMBERS: WBS-22-708-87-06
PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES): National Aeronautics and Space Administration John H. Glenn Research Center at Lewis Field Cleveland, Ohio 44135-3191
PERFORMING ORGANIZATION REPORT NUMBER: E-13846
SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES): National Aeronautics and Space Administration Washington, DC 20546-0001
REPORT TYPE AND DATES COVERED: Technical Memorandum
SPONSORING/MONITORING AGENCY REPORT NUMBER: NASA/TM-2003-212226
SUPPLEMENTARY NOTES: Javier A. Kypuros, University of Texas, Pan American University, Edinburg, Texas 78539; Kevin J. Melcher, NASA Glenn Research Center. Responsible person, Kevin J. Melcher, organization code 5530, 216-433-3743.
ABSTRACT: This paper describes a dynamic model that was developed to predict changes in turbine tip clearance-the radial distance between the end of a turbine blade and the abradable tip seal. The clearance is estimated by using a first principles approach to model the thermal and mechanical effects of engine operating conditions on the turbine subcomponents. These effects are summed to determine the resulting clearance. The model is demonstrated via a ground idle to maximum power transient and a lapse-rate takeoff transient. Results show the model demonstrates the expected "pinch point" behavior. The paper concludes by identifying knowledge gaps and suggesting additional research to improve the model.
SUBJECT TERMS: Clearances; Active control; Turbine
NUMBER OF PAGES: 32
PDF AVAILABLE FROM URL: 2003/TM-2003-212226.pdf ( 1198 KB )
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