Pressure Measurements on the Rotating Blades of an Axial-Flow Compressor

Sexton, Michael R.; O’Brien, Walter F.; Moses, H. L.

doi:10.1115/73-gt-79

Cited by 2 publications

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“…A circular polarized antenna was required to ensure 100% data transmission as the WPS rotated 360 • . As in [20], the dipole antenna was out of phase every 180 • thus causing data retrieval intermittent. The output signal of the WPS was transmitted to another antenna of the same type positioned roughly 1 meter away.…”

Section: Wireless Pressure Systemmentioning

confidence: 99%

“…However wireless sensor systems that can be used in rotational environments such as in compressors and turbine engines, where the sensing element actually rotates in a circular fashion at various temperature and pressure ranges have not been widely reported. Sexton, et al, offer one of the earliest reports on a wireless pressure sensor system for turbine applications [20]. The pressure sensor is attached to a rotor blade of a compressor and the data is transmitted to a stationary receive antenna.…”

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confidence: 99%

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Real-Time Wireless Pressure Sensing System for Stall and Loading Measurements in the Rotating Frame of Reference for a Low Speed Compressor

2022

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In this paper the fabrication and characterization of a novel wireless pressure sensor system that can monitor and report real-time changes in pressure on the rotor blade of a low speed axial compressor is demonstrated. The pressure sensor was positioned on the second-stage rotor at approximately the mid-span location on the pressure surface of the blade near the leading edge and hard wired to a circuit box located on the center line of the compressor drum. The output of the pressure sensor is converted from a voltage to a frequency and transmitted wirelessly via circularly polarized antenna to a stationary antenna that was approximately 1 meter away, mounted at the centerline location on the inlet cart. The output signal was recorded on a spectrum analyzer with a LabVIEW program for data acquisition. Compressor rotation was ramped from 0 RPM up to its design speed of 1000 RPM and the airflow was decreased by closure of downstream throttle valve until the compressor stalled. The measurements from the wireless pressure system show increasing pressure as compressor flow rate is decreased, until a precipitous drop in pressure occurs which signals that the compressor has stalled. Index Terms-Wireless pressure sensor system, pressure sensor, low speed axial compressor, cylindrical antenna. I. INTRODUCTIONG AS turbine engines are widely used in power generation and propulsion applications, and the industry is continually seeking to increase power density. End users require safety, robustness, long machine-on times and component lifetimes, and flexible duty cycles, in addition to fuel efficiency. In its Aeronautics Strategic Implementation Plan, NASA has defined goals to simultaneously reduce fuel consumption, emissions, and noise [1] for future generations of large commercial air transports. For far-term commercial air transport, fuel/energy consumption reductions of 60-80% relative to a 2005 best-in-class airplane are targeted. To meet this goal, future propulsion systems using turbofan engines are Manuscript

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Section: Wireless Pressure Systemmentioning

confidence: 99%

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confidence: 99%