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Walter F. O'Brien
Researcher at Virginia Tech
Publications - 126
Citations - 1558
Walter F. O'Brien is an academic researcher from Virginia Tech. The author has contributed to research in topics: Distortion & Turbofan. The author has an hindex of 22, co-authored 126 publications receiving 1458 citations.
Papers
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Journal ArticleDOI
Plasma torch igniter for scramjets
TL;DR: A small uncooled plasma torch was developed and used in combination with an injector designed to study ignition and flameholding in hydrogen-fueled supersonic flows as discussed by the authors.
Journal ArticleDOI
Improved Aerodynamic-Ramp Injector in Supersonic Flow
TL;DR: In this paper, an experimental study was performed in the Virginia Polytechnic Institute and State University supersonic wind tunnel on a simplified and revised multiport aerodynamic-ramp injector array.
PatentDOI
Active control of aircraft engine inlet noise using compact sound sources and distributed error sensors
TL;DR: In this paper, an active noise control system using a compact sound source is used to reduce aircraft engine duct noise using an adaptive filtered-x algorithm, which is based on an array of identical thin, cylindrically curved panels (125) with an inner radius of curvature corresponding to that of the engine inlet.
Journal ArticleDOI
Active control of fan noise from a turbofan engine
TL;DR: In this paper, a three-channel active control system is applied to an operational turbofan engine to reduce tonal noise produced by both the fan and the high-pressure compressor.
Journal ArticleDOI
Integration of an Aeroramp Injector/Plasma Igniter for Hydrocarbon Scramjets
TL;DR: In this paper, an aerodynamic-ramp injector and a DC plasma torch was designed for a scramjet vehicle operating from Mach 4 to Mach 8. The injector consisted of two rows of two holes, angled downstream, and toed in to create additional vorticity and enhance mixing.