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Published online by Cambridge University Press: 05 May 2013
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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