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Author Pulliam, Wade ♦ Russler, Patrick
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Turbine Engine Component ♦ High Bandwidth ♦ Mem Pressure Sensor Technology ♦ Measurement Technique ♦ Skin Friction ♦ Test Rig Application ♦ Extrinsic Fabry-perot Interferometry ♦ Temperature Environment ♦ Optical Technique ♦ Harsh Condition ♦ High-speed Combustors ♦ High Frequency Pressure ♦ Operating Engine ♦ Optical Measurement Technology ♦ Combustion Instability ♦ Acquiring Pressure Measurement ♦ Pressure Fluctuation ♦ Turbine Engine Research Center ♦ Temperature Variation ♦ Transonic Fan ♦ Compressor Research Facility ♦ Blade-row Interaction ♦ Unsteady Aerodynamic Phenomenon ♦ Flow Environment ♦ Aerospace Propulsion Application ♦ High Temperature Environment ♦ Lifetime Wear Characterization ♦ Turbine Engine ♦ Advanced Microfabrication ♦ Lifetime Wear ♦ Signal Processing Electronics ♦ Transient Measurement ♦ General Functionality ♦ Luna Innovation ♦ Harsh Environment ♦ Basic Operating Principle ♦ Measurement Technology ♦ Available Measurement Technology ♦ Proof-of-concept Data ♦ Certain Property ♦ Point Measurement ♦ Minimal Measurement Interference
Abstract Acquiring accurate, transient measurements in harsh environments has always pushed the limits of available measurement technology. Until recently, the technology to directly measure certain properties in extremely high temperature environments has not existed. Advancements in optical measurement technology have led to the development of measurement techniques for pressure, temperature, acceleration, skin friction, etc. using extrinsic Fabry-Perot interferometry (EFPI). The basic operating principle behind EFPI enables the development of sensors that can operate in the harsh conditions associated with turbine engines, high-speed combustors, and other aerospace propulsion applications where the flow environment is dominated by high frequency pressure and temperature variations caused by combustion instabilities, blade-row interactions, and unsteady aerodynamic phenomena. Using micromachining technology, these sensors are quite small and therefore ideal for applications where restricted space or minimal measurement interference is a consideration. In order to help demonstrate the general functionality of this measurement technology, sensors and signal processing electronics currently under development by Luna Innovations were used to acquire point measurements during testing of a transonic fan in the Compressor Research Facility (CRF) at the Turbine Engine Research Center (TERC), WPAFB. Acquiring pressure measurements at the surface of the casing wall provides data that are useful in understanding the effects of pressure fluctuations on the operation and lifetime wear of a fan. This measurement technique is useful in both test rig applications and in operating engines where lifetime wear characterization is important. The measurements acquired during this test also assisted in the continuing development of this technology for higher temperature environments by providing proof-of-concept data for sensors based on advanced microfabrication and optical techniques.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study