α |
linear absorption coefficient, L −1; numerical parameter (Chapter 7), nondimensional |
β |
burning rate temperature sensitivity coefficient, θ −1 |
γ |
specific heat ratio, nondimensional; frequency (Chapter 9), nondimensional |
 |
frequency, T −1 |
δ |
Jacobian, nondimensional; Feigenbaum constant, nondimensional |
δ m, n |
Kronecker delta |
ε |
erosion ratio (coefficient), nondimensional |
ζ |
channel coefficient of resistance, nondimensional; acoustic admittance, nondimensional |
,  |
nozzle gain coefficient, nondimensional |
η |
pressure, nondimensional; relative concentration of the product, nondimensional; progress variable of chemical transformation, nondimensional |
θ |
temperature, nondimensional |
Θ |
response function of temperature of combustion products to oscillating pressure, nondimensional |
ϑ |
surface temperature, nondimensional |
ι |
sensitivity coefficient, nondimensional |
κ |
propellant thermal diffusivity, L 2 T −1 |
λ |
thermal conductivity, MLT −3 θ −1; oscillation damping decrement, nondimensional |
μ |
sensitivity coefficient, nondimensional |
μ b |
sensitivity coefficient, nondimensional |
, μ g |
molecular weight, MN −1 |
ξ |
cartesian coordinate, nondimensional |
ρ |
density, ML −3 |
σ |
ratio of instantaneous nozzle cross‐sectional area to its initial value, nondimensional; ratio of relaxation times of the gas and condensed phases, nondimensional |
τ |
time, nondimensional |
τ U, V, r |
lag times, nondimensional |
ϕ |
temperature gradient at the surface, at the condensed phase side, nondimensional |
χ |
apparatus constant, nondimensional |
ψ |
phase shift, nondimensional; velocity potential, L 2 T −1; auxiliary function of time (Chapter 7) |
ω ,  |
complex frequency, nondimensional |
Ω |
complex frequency, T −1, or no‐dimensional (Chapter 9) |
a |
ambient; acoustic |
b |
burning; combustion temperature |
bl |
boiling |
c |
condensed phase |
ch |
combustion products efflux from the chamber |
cr |
chemical reaction |
cs |
condensed phase side, at the surface |
d |
delay |
e |
correction to steady‐state value (Chapter 4); entropy; extremum |
f |
final; position of flame front; flame |
g |
gas; mass velocity |
gs |
gas phase side, at the surface |
i |
initial; infinite |
I |
radiation conditions |
na |
nonacoustic |
p |
pressure; products; time scale of unsteady process (e.g. a period of pressure variation); response to variable pressure |
r |
radiation; reference; relaxation |
s |
surface; solid; position of liquid–gas interface |
ε |
erosion; erosive combustion regime |
ϕ |
nondimensional temperature gradient at the surface (condensed phase side) |
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