Path: SC/Actuator
% Compute the propellant mass and pressurant mass for a tank. The following equation is used: p = R*( mPressurant*T )/(V-mFuel/rhoFuel ) where p is the pressure, R is the gas constant of the pressurant, V is the tank volume, and rhoFuel is the density of the fuel. The mass of the pressurant is found by setting p=pMin and mFuel=0. The total mass of the fuel is then found by solving the above equation for "mFuel". Helium gas constant: 2079 J/(kg*K) Hydrazine density: 1010 kg/m^3 Convert PSI-to-metric: 1 PSI = 6895 N/m^2 -------------------------------------------------------------------------- Form: [mFuel,mPressurant] = PropellantMass( V, R, T, rhoF, pMax, pMin ); -------------------------------------------------------------------------- ------ Inputs ------ V (1,1) Tank volume (m^3) R (1,1) Gas constant of pressurant (J/kg/K) T (1,1) Temperature (K) rhoFuel (1,1) Density of fuel (kg/m^3) pMax (1,1) Maximum pressure (N/m^2) pMin (1,1) Minimum pressure (N/m^2) ------- Outputs ------- mFuel (1,1) Mass of the propellant (kg) mPressurant (1,1) Mass of the pressurant (kg) --------------------------------------------------------------------------
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