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Part I: For the nacelle at a steady incidence

Published online by Cambridge University Press:  04 July 2016

M. J. Sheu  and
G. J. Hancock
M. J. Sheu
Affiliation:
Department of Aeronautical EngineeringQueen Mary College, University of London
G. J. Hancock
Affiliation:
Department of Aeronautical EngineeringQueen Mary College, University of London
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Summary

A simple nacelle comprising a thin cylindrical shell of uniform diameter enclosing an engine, idealised by an actuator disc, is analysed at incidence to a low speed uniform stream for various engine mass flow rates on the basis of a vortex lattice model.

Loadings along the length of the nacelle are calculated, together with the overall normal force, the leading edge thrust on the nacelle nose, and the overall pitching moment. Most of the loading arises over the front part of the nacelle, which is well known. However, there is a significant contribution to the overall pitching moment from the nacelle nose for a nacelle, with engine, at incidence; this effect is absent from a through flow nacelle without an engine. Formulae for ∂CN/∂α and ∂CM/∂α as functions of mass flow rate are derived for a length/diameter ratio of 3:0.

Type
A simplified model for external loading on an engine nacelle enclosing an engine
Information
The Aeronautical Journal , Volume 88 , Issue 880 , December 1984 , pp. 431 - 439
Copyright
Copyright © Royal Aeronautical Society 1984 

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References

1. Sheu, M. J. and Hancock, G. J. A Simplified Model for External Loading on an Engine Nacelle, Enclosing an Engine. Part I: For the Nacelle at a Steady Incidence. QMC EP-1051, July 1983.Google Scholar
2. Sheu, M. J. and Hancock, G. J. Application of Vortex Lattice Method to Standard Euro-Mech Nacelle. QMC EP-1045, November 1982.Google Scholar