Notation

Variables with dimensions

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Dimensionless variables

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Subscripts

b relating to boundary layer
cr value at critical point
d unswept, or ‘dead’
c, C relating to compression space
e, E relating to expansion space
e relating to excitation (or free-stream) conditions
g relating to working gas (or fluid)
L, R left, right
L, U lower, upper
0 (zero) ambient value of (e.g. T0)
opt optimum value of
r relating to regenerator
ref reference value of
su relating to Sutherland equation for temperature dependence of fluid property
w relating to wall or wire (of regenerator)
x (heat) exchanger
xc relating to compression exchanger
xe relating to expansion exchanger
1, 2, 3 strategic points on cycle diagram
I, II I-wave (right-running) or II-wave (left-running) ...

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