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2 - Notation

Published online by Cambridge University Press:  05 May 2013

Wayne Johnson
Affiliation:
Aeromechanics Branch of NASA Ames Research Center
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Summary

This chapter summarizes the principal nomenclature to be used in the text. The intention is to provide a reference for the later chapters and also to introduce the basic elements of the rotor and its analysis. Only the most fundamental parameters are included here; the definitions of the other quantities required are presented as the analysis is developed. A number of the basic dimensionless parameters of helicopter analysis are also introduced. An alphabetical listing of symbols is provided at the end of the chapter.

Dimensions

Generally the analyses in this text use dimensionless quantities. The natural reference length scale for the rotor is the blade radius R, and the natural reference time scale is the rotor rotational speed Ω(rad/sec). For a reference mass the air density ρ is chosen.

For typographical simplicity, no distinction is made between the symbols for the dimensional and dimensionless forms of a quantity when the latter are based on ρ, Ω, and R. New symbols are introduced for t hose dimensionless parameters normalized using other quantities.

Nomenclature

Physical Description of the Blade

R = the rotor radius; the length of the blade, measured from center of rotation to tip.

Ω = the rotor rotational speed or angular velocity (rad/sec).

ρ = air density.

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Chapter
Information
Publisher: Cambridge University Press
Print publication year: 2013

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References

Gessow, A.Standard Symbols for Helicopters.” NACA TN 1604, June 1948.Google Scholar
Gessow, A., and Myers, G.C. Jr.Aerodynamics of the Helicopter. New York: The Macmillan Company, 1952.Google Scholar
Shapiro, J.Principles of Helicopter Engineering. London: Temple Press Limited, 1955.Google Scholar

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  • Notation
  • Wayne Johnson
  • Book: Rotorcraft Aeromechanics
  • Online publication: 05 May 2013
  • Chapter DOI: https://doi.org/10.1017/CBO9781139235655.003
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  • Notation
  • Wayne Johnson
  • Book: Rotorcraft Aeromechanics
  • Online publication: 05 May 2013
  • Chapter DOI: https://doi.org/10.1017/CBO9781139235655.003
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Notation
  • Wayne Johnson
  • Book: Rotorcraft Aeromechanics
  • Online publication: 05 May 2013
  • Chapter DOI: https://doi.org/10.1017/CBO9781139235655.003
Available formats
×