Fundamento
Equilibrium constant
Kp relates the partial activities of products and reactants at equilibrium.
\(K_p=\prod_i(P_i/P^\circ)^{\nu_i}\)
ThermoLab · Chapters 16 and 17
Chemical equilibrium and compressible flow
Interpolates Kp and solves Mach number, choking, critical area and normal shock in a De Laval nozzle.
Motor listo
Engineering results
NOT RUNDetailed calculation reportEquations · substitution · verification
Run the calculation to generate the report.
Engineering directory
13 linked modules on a single calculation base
Open any tool without losing your chosen unit system. Each page works on its own and keeps its navigation, report and export.
01
Appendices A-1 to A-28Universal property interpolator
→02Chapters 1 and 2Pressure, temperature and general energy balance
→03Chapter 3Pure substances and equations of state
→04Chapter 4Energy integrals for closed systems
→05Chapter 5Control volumes and the first law
→06Chapters 6 and 7Second law, Carnot and entropy
→07Chapter 8Exergy, destruction and second-law efficiency
→08Chapter 9Gas power cycles
→09Chapter 10Rankine steam power cycles
→10Chapter 11Refrigeration cycles
→11Chapters 12 and 13Gas mixtures and psychrometrics
→12Chapters 14 and 15Combustion and adiabatic flame temperature
→13Chapters 16 and 17Chemical equilibrium and compressible flow
→Engineering framework
Theory, equations and conditions of use
Chemical equilibrium minimises Gibbs energy, while compressible flow couples energy, continuity and the speed of sound. Both problems are non-linear.
Fundamento
Stagnation properties
Static temperature falls as enthalpy is converted into velocity.
\(T_0/T=1+(k-1)M^2/2\)
Fundamento
Area–Mach relation
A single A/A* admits both a subsonic and a supersonic solution.
\(\frac{A}{A^*}=\frac{1}{M}[\frac{2}{k+1}(1+\frac{k-1}{2}M^2)]^{\frac{k+1}{2(k-1)}}\)
Base documentalÇengel & Boles, 7th edition · SI appendices A-1 to A-28
USCS conversionA-1E to A-27E, via exact factors from the SI base
AlcancePreliminary design, teaching and independent verification
Engineering FAQ
Preguntas frecuentes
Why are there two Mach numbers?+
The subsonic branch corresponds to a converging duct; the supersonic branch, to expansion after a sonic throat.
When does a shock appear?+
When the back pressure forces the supersonic branch to adapt inside the nozzle.
Does Kp have units?+
It is formulated with normalised activities, so it is dimensionless.