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, L2T−1
|
|
λ
|
thermal conductivity, MLT−3θ−1; oscillation damping decrement, nondimensional
|
|
μ
|
sensitivity coefficient, nondimensional
|
|
μ
b
|
sensitivity coefficient, nondimensional
|
|
, μg
|
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, L2T−1; auxiliary function of time (Chapter 7)
|
|
ω,
|
complex frequency, nondimensional
|
|
Ω
|
complex frequency, T−1, or no‐dimensional (Chapter 9)
|
Gothic
|
ℵ, ℵg, p
|
corrections (Chapter 9); nondimensional
|
|
𝔭g, p
|
complex amplitude (Chapter 9); nondimensional
|
Superscripts
|
a
|
analytical
|
|
c
|
tc approximation
|
|
cl
|
classical
|
|
f
|
final
|
|
i
|
initial; interval
|
|
I
|
radiation conditions
|
|
qs
|
quasi‐steady‐state
|
|
r
|
tr approximation
|
|
0
|
steady‐state regime
|
Subscripts
|
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
|
|
