Laboratory Infra-Red Thermal Assessment of Laser-Sintered High-Pressure Nozzle Guide Vanes to De-Risk Engine Design Programmes

2016 ◽  
Author(s):  
Benjamin Kirollos ◽  
Thomas Povey
Keyword(s):  
Thermal Performance ◽  
Cooling System ◽  
Experimental Tests ◽  
University Of Oxford ◽  
Engine Design ◽  
Infra Red ◽  
Nozzle Guide ◽  
Processing Techniques ◽  
The University ◽  
Nozzle Guide Vanes

The continuing maturation of metal laser-sintering technology (DMLS) presents the opportunity to de-risk the engine design process by experimentally down-selecting HPNGV cooling designs using laboratory tests of laser-sintered — instead of cast — parts to assess thermal performance. Such tests could be seen as supplementary to thermal-paint-test engines, which are used during certification to validate cooling system designs. In this paper, we compare conventionally cast and laser-sintered titanium alloy parts in back-to-back experimental tests at engine-representative conditions over a range of coolant mass flow rates. Tests were performed in the University of Oxford Annular Sector Heat Transfer Facility. The thermal performance of the cast and laser-sintered parts — measured using new infra-red processing techniques — is shown to be very similar, demonstrating the utility of laser-sintered parts for preliminary engine thermal assessments. We conclude that the methods reported in this paper are sufficiently mature to make assessments which could influence engine development programmes.

Laboratory Infrared Thermal Assessment of Laser-Sintered High-Pressure Nozzle Guide Vanes to Derisk Engine Design Programs

2017 ◽  
Vol 139 (4) ◽  
Author(s):  
Benjamin Kirollos ◽  
Thomas Povey
Keyword(s):  
High Pressure ◽  
Thermal Performance ◽  
Cooling System ◽  
Guide Vane ◽  
Experimental Tests ◽  
Laser Sintering ◽  
University Of Oxford ◽  
Engine Design ◽  
Nozzle Guide ◽  
Pressure Nozzle

The continuing maturation of metal laser-sintering technology (direct metal laser sintering (DMLS)) presents the opportunity to derisk the engine design process by experimentally down-selecting high-pressure nozzle guide vane (HPNGV) cooling designs using laboratory tests of laser-sintered—instead of cast—parts to assess thermal performance. Such tests could be seen as supplementary to thermal-paint test engines, which are used during certification to validate cooling system designs. In this paper, we compare conventionally cast and laser-sintered titanium alloy parts in back-to-back experimental tests at engine-representative conditions over a range of coolant mass flow rates. Tests were performed in the University of Oxford Annular Sector Heat Transfer Facility. The thermal performance of the cast and laser-sintered parts—measured using new infrared processing techniques—is shown to be very similar, demonstrating the utility of laser-sintered parts for preliminary engine thermal assessments. We conclude that the methods reported in this paper are sufficiently mature to make assessments which could influence engine development programs.

scholarly journals Determination of performance and parameters for turboprop and turboshaft engine for modification through change of gas temperature before turbine

2006 ◽  
Vol 127 (4) ◽  
pp. 34-43
Author(s):  
Stanisław ANTAS
Keyword(s):  
Engine Performance ◽  
Experimental Tests ◽  
Gas Temperature ◽  
Power Turbine ◽  
Methods Of Evaluation ◽  
Modification Method ◽  
Turboshaft Engine ◽  
Nozzle Guide ◽  
Nozzle Guide Vanes

The article presents the analysis of a commonly used performance modification method for turboprop and turboshaft engines with a free power turbine. The description of analytical and numerical methods of evaluation for a change of parameters and geometry of turbine assemblies are presented. There are also given the basic methods of changing throat area of turbine nozzle guide vanes and its influence on engine performance. The calculation methods are verified by experimental tests run by WSK “PZL-Rzeszów” S.A.

scholarly journals EXPERIMENTAL AND NUMERICAL ANALYSIS OF LOSS CHARACTERISTICS OF COOLED TRANSONIC NOZZLE GUIDE VANES

2021 ◽  
pp. 1-35
Author(s):  
Daniel Burdett ◽  
Thomas Povey
Keyword(s):  
Aerodynamic Performance ◽  
Loss Coefficient ◽  
Guide Vanes ◽  
Turbine Engine ◽  
University Of Oxford ◽  
Readiness Level ◽  
Exit Mach Number ◽  
Nozzle Guide ◽  
Engine Components ◽  
Nozzle Guide Vanes

Abstract This paper presents high-fidelity experimental traverse measurements downstream of an annular cascade of transonic nozzle guide vanes (NGVs) from a high-pressure (HP) turbine stage. The components are heavily-cooled real engine components from a modern civil gas turbine engine, operated at scaled engine conditions. Tests were conducted in the high technology readiness level (TRL) Engine Component Aerothermal (ECAT) facility at the University of Oxford. High resolution full-area traverse measurements of local kinetic energy (KE) loss coefficient are presented in several axial planes. In particular, we present: circumferential loss coefficient profiles at several radial heights; full-area traverses at three axial planes; and fully mixed-out loss calculations. Analysis of these data gives insight into particular loss structures, overall aerodynamic performance, and wake mixing rates. The effect of exit Mach number on performance is also considered. The data address a gap in the literature for detailed analysis of traverse measurements downstream of HP NGV engine components. Experimental data are compared with steady and unsteady RANS simulations, allowing benchmarking of typical CFD methods for absolute loss prediction of cooled components. There is relatively limited aerodynamic performance data in the literature for heavily cooled NGVs, and this study represents one of the most comprehensive of its type.

A New Experimental Facility to Investigate Combustor-Turbine Interactions in Gas Turbines With Multiple Can Combustors

2014 ◽  
Author(s):  
S. Luque ◽  
V. Kanjirakkad ◽  
I. Aslanidou ◽  
R. Lubbock ◽  
B. Rosic ◽  
...  
Keyword(s):  
Gas Turbines ◽  
High Speed ◽  
Cooling System ◽  
Guide Vane ◽  
Experimental Facility ◽  
Blow Down ◽  
Guide Vanes ◽  
Wide Range ◽  
Nozzle Guide ◽  
Nozzle Guide Vanes

This paper describes a new modular experimental facility that was purpose-built to investigate flow interactions between the combustor and first stage nozzle guide vanes of heavy duty power generation gas turbines with multiple can combustors. The first stage turbine nozzle guide vane is subjected to the highest thermal loads of all turbine components and therefore consumes a proportionally large amount of cooling air that contributes detrimentally to the stage and cycle efficiency. It has become necessary to devise novel cooling concepts that can substantially reduce the coolant air requirement but still allow the turbine to maintain its aerothermal performance. The present work aims to aid this objective by the design and commissioning of a high-speed linear cascade which consists of two can combustor transition ducts and four first stage nozzle guide vanes. This is a modular non-reactive air test platform with engine realistic geometries (gas path and near gas path), cooling system, and boundary conditions (inlet swirl, turbulence level and boundary layer). The paper presents the various design aspects of the high pressure blow down type facility, and the initial results from a wide range of aerodynamic and heat transfer measurements under highly engine realistic conditions.

Spray Cooling for Time Resolved Emission Measurements of ICs

2004 ◽  
Author(s):  
Rama R. Goruganthu ◽  
David Bethke ◽  
Shawn McBride ◽  
Tom Crawford ◽  
Jonathan Frank ◽  
...  
Keyword(s):  
Heat Flux ◽  
Thermal Performance ◽  
Flip Chip ◽  
Cooling System ◽  
Spray Cooling ◽  
Junction Temperature ◽  
Maximum Temperature ◽  
Uniform Heat Flux ◽  
High Heat Flux ◽  
Time Resolved

Abstract Spray cooling is implemented on an engineering tool for Time Resolved Emission measurements using a silicon solid immersion lens to achieve high spatial resolution and for probing high heat flux devices. Thermal performance is characterized using a thermal test vehicle consisting of a 4x3 array of cells each with a heater element and a thermal diode to monitor the temperature within the cell. The flip-chip packaged TTV is operated to achieve uniform heat flux across the die. The temperature distribution across the die is measured on the 4x3 grid of the die for various heat loads up to 180 W with corresponding heat flux of 204 W/cm2. Using water as coolant the maximum temperature differential across the die was about 30 °C while keeping the maximum junction temperature below 95 °C and at a heat flux of 200 W/cm2. Details of the thermal performance of spray cooling system as a function of flow rate, coolant

Matthew Cheung Salisbury, Worship in Medieval England. Past Imperfect Series. Croydon: ARC Humanities Press, 2018, 92 pages.

Mediaevistik ◽  
2020 ◽  
Vol 32 (1) ◽  
pp. 315-318
Author(s):  
Jane Beal
Keyword(s):  
English Translation ◽  
Recent Book ◽  
Medieval England ◽  
Late Medieval ◽  
Cambridge University ◽  
Liturgical Studies ◽  
University Of Oxford ◽  
Medieval Church ◽  
Late Medieval England ◽  
The University

Matthew Cheung Salisbury, a Lecturer in Music at University and Worcester College, Oxford, and a member of the Faculty of Music at the University of Oxford, wrote this book for ARC Humanities Press’s Past Imperfect series (a series comparable to Oxford’s Very Short Introductions). Two of his recent, significant contributions to the field of medieval liturgical studies include The Secular Office in Late-Medieval England (Turnhout: Brepols, 2015) and, as editor and translator, Medieval Latin Liturgy in English Translation (Kalamazoo: Medieval Institute Publications, 2017). In keeping with the work of editors Thomas Heffernan and E. Ann Matter in The Liturgy of the Medieval Church, 2nd ed. (Kalamazoo: Medieval Institute Publications, 2005) and Richard W. Pfaff in The Liturgy of Medieval England: A History (Cambridge University Press, 2009), this most recent book provides a fascinating overview of the liturgy of the medieval church, specifically in England. Salisbury’s expertise is evident on every page.

The Oxford Group and the Emergence of Animal Rights

2020 ◽  
Author(s):  
Robert Garner ◽  
Yewande Okuleye
Keyword(s):  
Animal Rights ◽  
Intellectual Development ◽  
Peter Singer ◽  
Animal Rights Movement ◽  
Friendship Group ◽  
University Of Oxford ◽  
Short Period ◽  
New Ideas ◽  
Oxford Group ◽  
The University

This book is an account of the life and times of a loose friendship group (later christened the Oxford Group) of ten people, primarily postgraduate philosophy students, who attended the University of Oxford for a short period of time from the late 1960s. The Oxford Group, which included—most notably—Peter Singer and Richard Ryder, set about thinking about, talking about, and promoting the idea of animal rights and vegetarianism. The group therefore played a role, largely undocumented and unacknowledged, in the emergence of the animal rights movement and the discipline of animal ethics. Most notably, the group produced an edited collection of articles published as Animals, Men and Morals in 1971 that was instrumental in one of their number—Peter Singer—writing Animal Liberation in 1975, a book that has had an extraordinary influence in the intervening years. The book serves as a case study of how the emergence of important work and the development of new ideas can be explained, and, in particular, how far the intellectual development of individuals is influenced by their participation in a creative community.

Dan Inman, The Making of English Theology: God and the Academy at Oxford (Minneapolis: Fortress Press, 2014). ISBN: 9781451469264

2017 ◽  
Author(s):  
Johannes Zachhuber
Keyword(s):  
Nineteenth Century ◽  
Early Nineteenth Century ◽  
University Of Oxford ◽  
History Of ◽  
History Of The University ◽  
The University

This chapter reviews the book The Making of English Theology: God and the Academy at Oxford (2014). by Dan Inman. The book offers an account of a fascinating and little known episode in the history of the University of Oxford. It examines the history of Oxford’s Faculty of Theology from the early nineteenth century to the middle of the twentieth. In particular, it revisits the various attempts to tinker with theology at Oxford during this period and considers the fierce resistance of conservatives. Inman argues that Oxford’s idiosyncratic development deserves to be taken more seriously than it often has been, at least by historians of theology.

‘The Laughter of Satan’

2018 ◽  
Author(s):  
Rosamund Oates
Keyword(s):  
Elizabeth I ◽  
University Of Oxford ◽  
The University ◽  
Established Church

This chapter explores the ideas at the heart of Puritanism, examining Tobie Matthew’s early radicalism. Using the controversies over vestments in 1564–6 and the visit of Elizabeth I to the University of Oxford in 1566, the chapter shows that the idea of ‘edification’ became a central principle of Puritanism. This chapter explores the spiritual demands of edifying reform and shows how it drove English Puritans into conflict with the monarch and the Established Church. It demonstrates that Matthew’s Puritanism was rooted in the experience of Marian exiles, and that he drew on their Calvinism and their resistance texts to justify his potentially seditious view of godly magistracy and rebellion.

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