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HARDBACK
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CTl

-

thrust loading coefficient; CTl=T/(1/2ρV02zcl)

CTn

-

thrust loading coefficient based on waterjet nozzle area An

D

-

diameter of blade circle

D

-

hydrodynamic drag

e

-

non-dimensional eccentricity; e=a/R

ēφ

-

unit normal vector along blade orbit

-

unit normal vector in direction of heading

KFy

-

transverse force coefficient; KFy=Fy/(ρD4n2)

KQ

-

torque coefficient; KQ=Q/(ρD5n2)

KT

-

thrust coefficient; KT=T/(ρD4n2)

J

-

advance ratio; J (or Λ)=V0/(nD)

L

-

hydrodynamic lift

l

-

span of blade

n

-

propulsor rotation rate

R

-

radius of blade circle

T

-

total thrust by propulsor

t

-

maximum thickness of profile

Va

-

speed of advance

VR

-

resultant velocity kinematic

V0

-

free stream velocity

z

-

number of blades

αF

-

kinematic angle of inflow relative to (horizontal) x-axis

β

-

geometric pitch angle

β0

-

hydrodynamic pitch angle without effect of induced velocities

ΔUa

-

local increase in axial velocity due to thrust production

η0

-

open water efficiency

λ

-

velocity ratio; λ=V0/(ωR)

ρ

-

mass density of water

φ

-

blade orbit angular position

ω

-

angular rotation rate [rad/s]

All quantities in SI-units



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