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A Blade-by-Blade Tip Clearance Measurement System for Gas Turbine Applications
Journal of Engineering for Gas Turbines and Power, 1994It is difficult to make a reliable measurement of running clearance in the hostile environment over the blading of a modern gas turbine. When engine manufacturers require the measurement to be made over every blade during live engine tests, system reliability, ruggedness, and ease of operation are of primary importance.
A. G. Sheard, B. Killeen
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AIP Conference Proceedings, 2014
A simultaneous blade tip timing (BTT) and blade tip clearance (BTC) measurement system enables the determination of turbomachinery blade vibrations and ensures the monitoring of the existing running gaps between the blade tip and the casing. This contactless instrumentation presents several advantages compared to the well-known telemetry system with ...
R. Tomassini, G. Rossi, J.-F. Brouckaert
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A simultaneous blade tip timing (BTT) and blade tip clearance (BTC) measurement system enables the determination of turbomachinery blade vibrations and ensures the monitoring of the existing running gaps between the blade tip and the casing. This contactless instrumentation presents several advantages compared to the well-known telemetry system with ...
R. Tomassini, G. Rossi, J.-F. Brouckaert
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Applied Thermal Engineering, 2022
Abstract The blade tip region of the gas turbine is exposed to an extreme operating condition with a high heat load. The conventional cooling concept that places cooling holes on the tip would consume a lot of cooling air and lead to a reduction in thermal efficiency.
Feng Li +4 more
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Abstract The blade tip region of the gas turbine is exposed to an extreme operating condition with a high heat load. The conventional cooling concept that places cooling holes on the tip would consume a lot of cooling air and lead to a reduction in thermal efficiency.
Feng Li +4 more
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Turbine Blade Tip Clearance Improvement
Volume 1: Turbomachinery, 1991A recently developed non-traditional design concept addressing turbine blade tip clearance reduction to provide long-term engine performance improvement and stability is presented. The concept is based on the direct attachment of the diaphragm, which supports Stage 1 integral nozzle and tips shroud segments, to the bearing housing, thus providing a ...
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A Microwave Blade Tip Clearance Sensor for Active Clearance Control Applications
40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 2004Active clearance control has been used to improve efficiency and performance in commercial aircraft engines. Technologies implemented to date rely on compressor bleed air to control clearances based on open loop control and the flight regime (takeoff, cruise, etc.).
Jonathan Geisheimer +2 more
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Turbine Blade Tip Clearance Measurement Utilizing Borescope Photography
Volume 1B: General, 1978In this paper, a technique is presented for the detrmination of turbine rotor bade tip-to-stationary shroud clearance requirements utilizing fiber optics. To accomplish these tip clearance determinations, special rub pins were installed in the turbine shrouds, or tip-shoes, of a 10,000-hp engine.
A. L. Chandler, A. R. Finkelstein
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Measurement of blade tip clearance using an ultrasonic sensor
35th Aerospace Sciences Meeting and Exhibit, 1997This paper describes a development and evaluation of a blade tip clearance measurement system using an ultrasonic sensor. Special features of this system are; (i) it is adequate for metal and non-metal blade; (ii) it permits measurement without contact; (iii) it can work in dirty environment; and (iv) it is easy to install. Experimental results using a
Takeshi Tagashira +7 more
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Robust Compressor Blades for Desensitizing Operational Tip Clearance Variations
Volume 2A: Turbomachinery, 2014Robust design is a multi-objective optimization framework for obtaining designs that perform favorably under uncertainty. In this paper robust design is used to redesign a highly loaded, transonic rotor blade with a desensitized tip clearance. The tip gap is initially assumed to be uncertain from 0.5 to 0.85% span, and characterized by a beta ...
Pranay Seshadri +2 more
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Measurement Science and Technology
Abstract The rotor blade tip clearance (BTC) of an aeroengine is a critical parameter that significantly impacts its performance and safety. Accurately determining dynamic BTC has been a focal point of research in experimental testing. Among the effective measurement methods for dynamic BTC, the laser triangulation method based on blade ...
Xiaolei Guo, Huoxing Liu, Zhihong Zhou
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Abstract The rotor blade tip clearance (BTC) of an aeroengine is a critical parameter that significantly impacts its performance and safety. Accurately determining dynamic BTC has been a focal point of research in experimental testing. Among the effective measurement methods for dynamic BTC, the laser triangulation method based on blade ...
Xiaolei Guo, Huoxing Liu, Zhihong Zhou
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Key Technique of Tip Clearance Measurement for Rotational Blades
Key Engineering Materials, 2008It’s an important problem for power industry; energy industry, aviation and shipping to real-time measure the rotating blades’ tip clearance of engine. The conventional measurement techniques have different limitations. To achieve applied level for tip clearance measurement technique, according to the use request and application environment of tip ...
Yu Zhen Ma +4 more
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