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Simplified Method for Evalu-ating Aerodynamic Interactions between Vane/Blade Rows—Mas-sachusetts Institute of Technol-ogy. Reducing efficiency losses, due to aerodynamic interactions be-tween adjacent rows of stationary vanes and rotating blades, is another important approach to improving gas turbine performance. However, the computer codes that are capable of aerodynamic analyses of the un-steady effects and complex geom-etry of adjacent airfoil rows require extensive manpower efforts to set up, multiple computer runs, and very long run times. Such analyses often require resources and time in excess of those available for a tur-bine development program. In a project coordinated with Solar Tur-bines, Massachusetts Institute of Technology (MIT) has been develop-ing a relatively simple aerodynam-ics analysis approach to represent the unsteady effects on compressor rotor blades resulting from their relative motion with respect to the downstream stationary stator vanes. MIT has conducted computer aero-dynamic analyses to show that this unsteadiness effect is negligible and the downstream stators can be rep-resented by a time-averaged pres-sure profile for the conditions analyzed. MIT is now seeking to delineate the general conditions un-der which this observation holds. For those conditions, the signifi-cance of the MIT results is that multiple expensive computer runs representing adjacent blade-vane rows will not be needed to deter-mine rotor aerodynamic perfor-mance. Only a single run, using a time-averaged downstream pressure profile, is needed.
Materials Research
Non-Destructive Evaluations of Thermal Barrier Coatings— University of Connecticut and University of California, Santa Barbara. The University of Con-necticut (UCONN) and University of California, Santa Barbara (UCSB) are developing NDE methods for TBCs. NDE methods are needed to improve TBC manufacturing qual-ity and operational lifetime incon-sistencies, which have impeded the full implementation of the turbine power and efficiency benefits de-rived from TBCs. The need is so great and the results from a past AGTSR project are so promising that several of the U.S. gas turbine manufacturers, a coating supplier, and an instrument maker are provid-ing a substantial in-kind and direct cost-share for this current AGTSR project. One expected output from this project is a low-cost and por-table prototype NDE instrument for TBCs, which will be used by tur-bine manufacturers, overhaul fa-cilities, and coating suppliers. In separate coordinated efforts, UCONN and UCSB are using laser tech-niques differently for NDE evalua-tions. UCONN uses laser techniques to measure stresses in coated labo-ratory specimens cycled to failure and coated engine parts from the field. Correlation of the laser sig-nals with TBC stress degradation is used to assess remaining TBC life. UCSB complements laser measure-ments of degraded materials prop-erties with mechanistic modeling to predict remaining life. Both projects have demonstrated laser signal cor-relation with life-affecting properties.
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本文链接地址：Advanced Turbine Systems 先进的涡轮系统(16)
