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Greek
| 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, L2T−1 |
| λ | thermal conductivity, MLT−3θ−1; oscillation damping decrement, nondimensional |
| μ | sensitivity coefficient, nondimensional |
| μ b | sensitivity coefficient, nondimensional |
 |
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 |
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r
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