Proposal for Equipment for Intelligent Aeroelastic Systems: Advanced Instrumentation for Unsteady Aerodynamic and Aeromechanics of Multi-Stage Turbomachinery Blading

摘要

High Cycle Fatigue (HCF) is a fundamental weakness in the technology base for turbine engines. To avoid surprise HCF failures or to design blades for longer life, accurate vibratory stress predictions are crucial. This requires validated design systems. As multistage blade row interactions drive most HCF problems the key barrier research issue is MultiStage Interaction Steady and Unsteady Aerodynamics. Hence, multistage forcing functions, their mutual interaction, and the resultant blade row steady and unsteady aerodynamic response, including three-dimensional and transonic flow conditions, must be addressed. To validate or direct the development of advanced models and the complete aeroelastic design system, data obtained in an appropriate multistage flow environment are required. Of particular interest is defining these three- dimensional blade row flow fields with enough detail for use in CFD code verification and development, thereby enabling the limits of applicability and the modeling inherent in the various codes to be addressed. To accomplish this, first appropriate experimental facilities which experimentally model the fundamental three dimensional steady and unsteady flow' phenomena are required. These are either currently available or are in progress funded by AFOSR at Purdue University. Hence, the key experimental issue is nonintrusive instrumentation capable of three-dimensional whole flow field measurements. Under this grant, instrumentation has been acquired to be utilized to quantify the three-dimensional blade row steady and instantaneous blade-to-blade velocity field.