brmj said:
Back to the thrust calculation issues: I am begining to suspect that the gases are a critical part of the problem. As has been mentioned previously, the densities will be off because of the composition. If by any chance the gas coming out of the engine was modelled at room temperature through some oversight, I expect that would have significant effects as well.
You are correct. The temperature for the gas was set to 25 C. I was under the assumption that if this is considered a combusted gas that everything would fall into place. With that said, the correct gas should be used. There is a long list of things that can be changed. I don't know where to begin, so I will just give the options and what I have chosen or were by default are in red.
For the domain:
Morphology
-Option: Continuous Fluid, Dispersed Fluid, Dispersed Solid, Particle Transport Fluid, Particle Transport Solid, Polydispersed Fluid or Droplets (Phase Change)
- Minimum Volume Fraction: Enter a value. I have it unchecked
Reference Pressure: I have set to 1 atm
Buoyancy
-Option: Non Buoyant or Buoyant
Domain Motion
-Option: Stationary or Rotating
Mesh Deformation
-Option: None or Regions of Motion Specified
Heat Transfer
-Option: Isothermal, Thermal Energy or Total Energy
- Fluid Temperature: 25 deg C
Turbulence
-Option: none (laminar), k-Epsilon, Shear Stress Transport, BSL Reynolds Stress or SSG Reynold Stress
-Wall Function: Scalable
-Advanced Turbulence Control: Eddy Viscosity, BC TKI Factor, Cmu Coefficient, Compressible Production, Limit Turbulent Timescale, Curvature Correction, K Coefficients, Epsilon Coefficients, Production Limiter
Combustion
Option: None {That's all I can choose}
Thermal Radiation
Option: None, Rosseland, P 1, Discrete Transfer, Monte Carlo
Electromagnetic Model - I have unchecked
Domain Initialization – I have unchecked
For the material N2O:
Basic Settings:
Option: Pure Substance, Fixed Composition Mixture, Variable Composition Mixture, Homogeneous Binary Mixture, Reacting Mixture or Hydrocarbon Fuel
Material Group: Gas Phase Combustion, Air Data, CHT Solids, Calorically Perfect Ideal Gases, Constant Property Gases, Constant Property Liquids, Dry Peng Robinson, Dry Redlich Kwong, Dry Steam, IAPWS IF97, Interphase mass Transfer, Liquid Phase Combustion, Particle Solids, Peng Robinson Dry Hydrocarbons, Peng Robinson Dry regrigerants, Peng Robinson Dry Steam, Peng Robinson Wet Hydrocarbons, Peng Robinson Wet Regrigerants, Peng Robinson Wet Steam, Real Gas Combustion, Redlich Kwong Dry Hydrocarbons, Redlich Kwong Dry Refrigerants, Redlich Kwong Dry Steam, Redlich Kwong Wet Hydrocarbons, Redlich Kwong Wet Refrigerants, Redlich Kwong Wet Steam, Soot, User, Water Data, Wet Peng Robinson, Wet Redlich Kwong, Wet Steam
Material Description: Nitrous Oxide N2O
Thermodynamic State:
Thermodynamic State: Gas, Liquid, Solid
Coord Frame: I have unchecked
Material Properties:
Option: General Material or State
(Thermodynamic Properties) ->
Equation of State:
Option: Value, Real Gas
Molar Mass: 44.01 [kg kmol^-1]
Density: This is blank
Specific Heat Capacity:
Option: NASA Format, Value or Zero Pressure Polynomial
(Temp Limits) ->
lower temperature: 300 [K]
Midpoint Temperature: 1000[K]
Upper Temperature: 5000 [K]
(Upper Interval Coefficients) ->
NASA a1: There is a number value here
NASA a2: There is a number value here
NASA a3: There is a number value here
NASA a4: There is a number value here
NASA a5: There is a number value here
NASA a6: There is a number value here
NASA a7: There is a number value here
(Lower Interval Coefficients) ->
NASA a1: There is a number value here
NASA a2: There is a number value here
NASA a3: There is a number value here
NASA a4: There is a number value here
NASA a5: There is a number value here
NASA a6: There is a number value here
NASA a7: There is a number value here
Reference State:
Option: NASA Format
Ref. Temperature: 25 [C]
Table Generation: unchecked
Transparent Properties:
(Dynamic Viscosity) ->
Option: Value, Kinetic Theory Model, Non Newtonian Model
Dynamic Viscosity: 13.5E-06 [kg m^-1 s^-1]
(Thermal Conductivity) ->
Option: Value, Kinetic Theory Model
Thermal Conductivity: 151E-04 [W m^-1 K^-1]
(Radiation Properties) ->
Refractive Index: Checked
Option: Value
Refractive Index: 1.0[m m^-1]
(Absorption Coefficient) ->
Option: Value
Absorption Coefficient 1.0 [m^-1]
(Scattering Coefficient) ->
Option: Value
Scattering Coefficient: 0.0 [m^-1]
(Buoyancy Properties) -> Unchecked
(Electromagnetic Properties) ->
Electrical Conductivity: Unchecked
Magnetic Permeability: Unchecked
Then, I have the option to add a reaction, but I am unsure how to use this.
The only way I can see moving forward is to either change the temperature or the molar mass.
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