Accession Number : ADA309956

Title :   Bladed Disk Forced Response Augmentation for Research Training (AASERT).

Descriptive Note : Final rept. 15 Aug 94-14 Aug 95,

Corporate Author : PURDUE UNIV LAFAYETTE IN SCHOOL OF MECHANICAL ENGINEERING

Personal Author(s) : Fleeter, Sanford

PDF Url : ADA309956

Report Date : OCT 1995

Pagination or Media Count : 12

Abstract : Two AASERT students have actively participated in research in turbomachinery fluid dynamics and bladed disk forced response. The academic programs of the AASERT students were individually tailored. One AASERT student investigated nonlinear friction dampers for control of blade row aero-mechanics. The energy balance, harmonic balance, and time integration solution methods were applied to an unstable aero-mechanical model thereby requiring a dry friction damper for stability. The results showed that the linearized harmonic and energy balance solutions can be used in preliminary design or as first guesses for nonlinear methods. The second AASERT student experimentally investigated the fundamental unsteady flow interaction phenomena significant to forced response and unsteady turbine heat transfer. The technical approach involved a series of experiments performed in a low speed research turbine. The rotor blade wake generated unsteady flow field, i.e., the unsteady forcing function, were measured over a range of turbine steady aerodynamic loading conditions. In addition, the unsteady heat transfer to the stator vane row was measured.

Descriptors :   *VIBRATION, *DYNAMIC RESPONSE, *GAS TURBINE BLADES, HEAT TRANSFER, METHODOLOGY, INTEGRATED SYSTEMS, SCHOOLS, STUDENTS, INTERACTIONS, ENERGY, AUGMENTATION, HARMONICS, DAMPING, MOISTURE CONTENT, TIME, LOW VELOCITY, NONLINEAR SYSTEMS, SOLUTIONS(GENERAL), RESPONSE, BALANCE, LOW LEVEL, STATORS, TURBINES, DISKS, UNSTEADY FLOW, FLUID DYNAMICS, FRICTION, TURBOMACHINERY, GAS TURBINE ROTORS, GUIDE VANES.

Subject Categories : Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE