Theory of Solid-Propellant Nonsteady Combustion. Vasily B. Novozhilov

_{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

, 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, 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