Falconer, Benedict Peter (2020) A system for remotely taking high velocity, large scale, PIV measurements in a hostile environment. PhD thesis, University of Warwick.

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Abstract

This thesis presents the design rationale, implementation and evaluation of a novel measurement system designed for determining flow patterns in the very severe environment of the wake of a 1/16th scale jet engine. Its particular emphasis is on the automated control systems and operation of the system, rather than on the aerodynamics of the jet. It covers developments in both hardware and software. The design specifications and deployment conditions for the new measurement system were targeted explicitly at supporting cross-European research collaborations involving a series of tests known as Optitheck, SILOET, and Symphony, which were intended to investigate noise production and reduction in the area from 0.1 to 18 nozzle diameters downstream from the nozzle exit.

The first sections of this thesis discuss the design and construction of the various aspects of the measurement system, focusing especially on several unusual requirements of the target project that cannot be met by typical conventional Particle Image Velicometry (PIV) setups. The system needs special optical configurations, fully remote control and should be suitable for rapid installation and removal in the main test facility. Notably a streaming system is designed to handle the large volume of data created by the PIV camera. Once created, it is analysed, and refined.

The following sections go on to detail the testing of all the key aspects of the system to ensure that it will operate correctly when used for the Optitheck, SILOET, and Symphony tests. Discussion then focuses on the installation and operation of the system when put into practice on a real jet for the tests, attempting to verify its performance. Despite limited data being available for comparison, it is concluded that data created from these tests is sufficiently accurate and the overall system fit for its intended purpose.

A project of this type inevitably requires many pragmatic decisions about approaches, constrained by immediate needs of the wider consortium. Also, computer hardware continues to evolve rapidly. The thesis therefore ends with an extended exploration of potential improvements to the system, based on the knowledge gained and advancements in technology over the duration of the project. It thereby conceives of a more refined and robust system that could be implemented as a ‘permanent’ instrument to support a facility for this type of flow measurements. This system includes new software designs as well as updated hardware.

Item Type:	Thesis (PhD)
Subjects:	Q Science > QA Mathematics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TL Motor vehicles. Aeronautics. Astronautics
Library of Congress Subject Headings (LCSH):	Jets -- Fluid dynamics, Particle image velocimetry, Turbulence -- Measurement, Air flow, Wakes (Aerodynamics)
Official Date:	April 2020
Dates:	Date Event April 2020 UNSPECIFIED
Institution:	University of Warwick
Theses Department:	School of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Bryanston-Cross, P. ; Timmerman, Brenda
Sponsors:	Rolls-Royce plc ; Airbus Industrie
Format of File:	pdf
Extent:	xxi, 525 leaves : illustrations (chiefly colour)
Language:	eng

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