Publications

Modeling Nonuniform Bleed in Axial Compressors

Authors:

S.D. Grimshaw, G. Pullan, T.P. Hynes

Publication:

Journal of Turbomachinery (2016) Vol. 138, Issue 9, Article 091010

DOI:

10.1115/1.4032845

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Stall, Surge, and 75 Years of Research

Work on rotating stall and its related disturbances have been in progress since the Second World War. During this period, certain "hot topics" have come to the fore-mostly in response to pressing problems associated with new engine designs. This paper will take a semihistorical look at some of these fields of study (stall, surge, active control, rotating instabilities, etc.) and will examine the ideas which underpin each topic. Good progress can be reported, but the paper will not be an unrestricted celebration of our successes because, after 75 years of research, we are still unable to predict the stalling behavior of a new compressor or to contribute much to the design of a more stall-resistant machine. Looking forward from where we are today, it is clear that future developments will come from CFD in the form of better performance predictions, better flow modeling, and improved interpretation of experimental results. It is also clear that future experimental work will be most effect

Authors:

Day, IJ

Publication:

Journal of Turbomachinery

DOI:

10.1115/1.4031473

Direct Numerical Simulations of a High-Pressure Turbine Vane

In this paper, we establish a benchmark data set of a generic high-pressure (HP) turbine vane generated by direct numerical simulation (DNS) to resolve fully the flow. The test conditions for this case are a Reynolds number of 0.57 x 10(6) and an exit Mach number of 0.9, which is representative of a modern transonic HP turbine vane. In this study, we first compare the simulation results with previously published experimental data. We then investigate how turbulence affects the surface flow physics and heat transfer. An analysis of the development of loss through the vane passage is also performed. The results indicate that freestream turbulence tends to induce streaks within the near-wall flow, which augment the surface heat transfer. Turbulent breakdown is observed over the late suction surface, and this occurs via the growth of two-dimensional Kelvin-Helmholtz spanwise roll-ups, which then develop into lambda vortices creating large local peaks in the surface heat transfer. Turbulent

Authors:

Andrew P. S. Wheeler et al

Publication:

Journal of Turbomachinery

DOI:

10.1115/1.4032435

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A study of trailing-edge losses in organic Rankine cycle turbines

In this paper, vane trailing-edge losses which occur in organic rankine cycle (ORC) turbines are investigated. Experiments are performed to study the influence of dense gas effects on trailing-edge loss in supersonic flows using a novel Ludwieg tube facility for the study of dense-gas flows. The data is also used to validate a computational fluid dynamics (CFD) flow solver. The computational simulations are then used to determine the contributions to loss from shocks and viscous effects which occur at the vane trailing edge. The results show that dense gas effects play a vital role in the structure of the trailing-edge flow, and control the extent of shock and viscous losses

Authors:

Francisco J. Durá Galiana, Andrew P.S. Wheeler and Jonathan Ong

DOI:

10.1115/1.4033473

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Loss and Deviation in Windmilling Fans

Authors:

Gunn, Ewan J.; Hall, Cesare A.

Publication:

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME Volume: 138 Issue: 10

DOI:

10.1115/1.4033163

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Novel usage of five-hole probes: Tidal channel turbulence measurements

Authors:

Young, A., Guion, R., Atkins, N. and Costan, J.,

Publication:

In proceedings of the XXIII Biannual Symposium on Measurement Techniques in Turbomachinery

Competing 3D Mechanisms in Compressor Flows

Authors:

Taylor JV, Miller RJ

Publication:

Journal of Turbomachinery

DOI:

10.1115/1.4034685

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Wireless RF telemetry for rotating frame data acquisition and control

Obtaining measurements in the rotating frame of reference requires either real-time communication between the rotating and stationary frames, or temporary data storage in the rotating frame. Rotating telemetry systems must be low-noise and high-bandwidth, which is hard to achieve using traditional slip-ring arrangements, while using temporary data storage introduces synchronisation issues. In this paper, the use of wireless telemetry for real-time data acquisition is demonstrated for two applications: tidal turbine load control and large-scale turbine pressure measurements.

Authors:

Farman, J.R.

Publication:

In proceedings of the XXIII Biannual Symposium on Measuring Techniques in Turbomachinery

DOI:

https://doi.org/10.17863/CAM.40671

A Computational and Experimental Compressor Design Project for Japanese and British High-School Stud

This paper describes an innovative, three-day, turbomachinery research project for Japanese and British high-school students. The project is structured using modern teaching theories that encourage student curiosity and creativity. The experience develops teamwork and communication and helps to break down the cultural and linguistic barriers between students from different countries and backgrounds. The approach provides a framework for other hands-on research projects that aim to inspire young students to undertake a career in engineering. The project is part of the Clifton Scientific Trust's annual UK–Japan Young Scientist Workshop Programme.

Authors:

S. D. Grimshaw, C. L. Sequeira and M. Hewkin-Smith

Publication:

Journal of Engineering for Gas Turbines and Power

DOI:

10.1115/1.4035208

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Fast Settling Millimetre-Scale Five-Hole Probes

Authors:

S.D. Grimshaw, J.V. Taylor

Publication:

ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, Volume 6

DOI:

10.1115/GT2016-56628

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