Publications

A Pneumatic Probe for Measuring Spatial Derivatives of Stagnation Pressure

This paper introduces a pneumatic 9-hole probe which can measure flow angles, stagnation and static pressures, and spatial derivatives of stagnation pressure. It does this through direct measurement at a single location, rather than empirical corrections using measurements at multiple points. The new design resembles a 5-hole probe with 4 additional holes positioned around the side of the probe head. This arrangement enables the probe to distinguish between flows with stagnation pressure gradient and flows at an angle. Mapping between the inputs, the probe hole pressures, and outputs, the calibration reference measurements, is achieved with a trained neural network which takes the place of a conventional calibration map.

Authors:

C.J. Clark, S.D. Grimshaw

Publication:

Proceedings of ASME Turbo Expo 2019

Loss in Axial Compressor Bleed Systems

A new method for characterising bleed system loss is introduced, using research compressor test results as a demonstration case. A loss coefficient is defined for a control volume including only flow passing through the bleed system. The coefficient takes a measured value of 95% bleed system inlet dynamic head, and is shown to be a weak function of compressor operating point and bleed rate, varying by +/-2.2% over all tested conditions. This loss coefficient is the correct non-dimensional metric for quantifying and comparing bleed system performance.

Authors:

S.D. Grimshaw, J. Brind, G. Pullan, R. Seki

Publication:

Proceedings of ASME Turbo Expo 2019

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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Bleed Induced Distortion in Axial Compressors

Authors:

S. D. Grimshaw, G. Pullan, T. Walker

Publication:

Journal of Turbomachinery (2015) Vol. 137, Issue 9, Article 101009

DOI:

10.1115/1.4030809

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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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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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