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Effect of Geometry Variability on Transonic Fan Blade Untwist

Rolls-Royce Vibration UTC, Imperial College London, London SW7 2AZ, UK
Rolls-Royce plc, Derby DE24 9HY, UK
Author to whom correspondence should be addressed.
This paper is an extended version of our paper published in Proceedings of the European Turbomachinery Conference ETC13, Lausanne, Switzerland, 8–12 April 2019, Paper No. 224.
Current address: Imperial College London, South Kensington, London SW7 2AZ, UK.
Int. J. Turbomach. Propuls. Power 2019, 4(3), 24;
Received: 19 June 2019 / Revised: 29 July 2019 / Accepted: 31 July 2019 / Published: 5 August 2019
Due to manufacturing tolerance and deterioration during operation, fan blades in the same engine exhibit geometric variability. The absence of symmetry will inevitably exacerbate and contribute to the complexities of running geometry prediction as the blade variability is bound to be amplified by aerodynamic and centrifugal loading. In this study, we aim to address the fan blade untwist related phenomenon known as alternate passage divergence (APD). As the name suggests, APD manifests as alternating passage geometry (and hence alternating tip stagger pattern) when the fan stage is operating close to/at peak efficiency condition. APD can introduce adverse influence on fan performance, aeroacoustics behaviour, and high cycle fatigue characteristics of the blade. The main objective of the study is to identify the parameters contributing to the APD phenomenon. In this study, the APD behaviours of two transonic fan blade designs are compared. View Full-Text
Keywords: aeroelasticity; untwist; variability; shock sensitivity aeroelasticity; untwist; variability; shock sensitivity
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Lu, Y.; Lad, B.; Green, J.; Stapelfeldt, S.; Vahdati, M. Effect of Geometry Variability on Transonic Fan Blade Untwist . Int. J. Turbomach. Propuls. Power 2019, 4, 24.

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