1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | function air = igm_air(property1, value1, units, property2, value2)% -------------------------------------------------------------------------% igm_air% -------------------------------------------------------------------------% Fundamentals of Thermodynamics% A function that uses one independent property of air and the % ideal gas model (IGM) and determines as the output air, % a structure with all relevant properties at the same state. % Since one is using the IGM, only one temperature dependent% property is needed to properly fix the state.% -------------------------------------------------------------------------% Syntax: (using 3 input arguments) % air = igm_air(property1, value1, units)%% Inputs: property1 = the name of property1 ('T', 'h', 'u', 's0', % 'pr', or 'vr')% value1 = the value of property1% units = 1 (SI units) or 2 (English units)% Output: air = the structure with all relevant properties in relevant% fields (T, h, u, s0, pr, vr, cp, cv, k, M, R). % % Valid properties and units:% T - temperature (K or R)% h - specific enthalpy (kJ/kg or Btu/lb)% u - specific internal energy (kJ/kg or Btu/lb)% s0 - specific entropy at atm pressure (kJ/kg*K or Btu/lb*R)% pr - pressure ratio (unitless)% vr - specific volume ratio (unitless)% cp - specific heat at constant pressure (kJ/kg*K or Btu/lb*R)% cv - specific heat at constant volume (kJ/kg*K or Btu/lb*R)% k - specific heat ratio (unitless)% M - molecular weight (kg/kmol or lb/lbmol)% R - gas constant (TBD)% % Syntax: (using 5 input arguments)% air = igm_air(property1, value1, units, property2, value2)%% Additional Inputs: property2 = the name of property2 ('p' or 'v')% value2 = the value of property2%% Output: air = the structure with all relevant properties in relevant% fields (all above and p and v).% p - pressure (TBD)% v - specific volume (m^3/kg or ft^3/lb)% % -------------------------------------------------------------------------% Notes: Use consistent SI or English units. % All specific properties defined per unit mass. %--------------------------------------------------------------------------% Example% air = igm_air('T', 300, 1)% This example corresponds to air as an ideal gas at 300 degrees K.%--------------------------------------------------------------------------% Simon Ruiz, Undergraduate student, Mechanical Engineering% Dr.Priya Goeser, Professor% Robyn Callaghan, Undergraduate student, Mechanical Engineering% Chance Borgeson, Undergraduate student, Mechanical Engineering% Original: May 13, 2013% Modified: May 31, 2016% Copyright (c) 2013 Simon Ruiz, All Rights Reserved.% Engineering Studies Program, Armstrong State University.% ------------------------------------------------------------------------- |