Command-line runner · RustPEP docs

The RustPEP project includes propep, a command-line runner built on the same solver and data as the desktop application.

The 0.1.0 download packages contain the desktop application only. How the command-line runner will be distributed has not been finalized, so treat this page as a reference for the tool rather than something you can install today.

Finding an ingredient

Ingredients are referred to by their code number. find searches by name:

propep find "ammonium perchlorate"

  137  AMMONIUM PERCHLORATE (AP)       dHf    -602 cal/g  rho  1.949 g/cc  Oxidizer

Running a recipe

Give each ingredient as code=grams:

propep run --pc 1000 137=68 845=20 63=12

Option	Meaning	Default
`--db legacy\|cea`	Product database	`cea`
`--pc <psi>`	Chamber pressure	`1000`
`--pe <psi>`	Exit pressure	`14.7`
`--ions`	Include ionized species	off
`--legacy-compat`	Legacy atomic weights and enthalpy basis	off
`--json`	Print the result as JSON instead of the text report	off
`--nozzle`	Also print the expansion-ratio table	off

Sample output

The text report follows the layout of the original PEP program. This is the output for the command above, with the chamber and exhaust species tables left out:

  CODE                                   WEIGHT    D-H  DENS      COMPOSITION
   137 AMMONIUM PERCHLORATE (AP)         68.000   -602  0.07040    1CL  4H   1N   4O
   845 R45 HTPB (UTC)                    20.000      5  0.03360  981H 654C   6O
    63 ALUMINUM (PURE CRYSTALINE)        12.000      0  0.09760    1AL

THE PROPELLANT DENSITY IS 0.05938 LB/CU-IN OR  1.6436 GM/CC
THE TOTAL PROPELLANT WEIGHT IS  100.0000 GRAMS

****************************CHAMBER RESULTS FOLLOW*****************************

  T(K)  T(F)  P(ATM)   P(PSI) ENTHALPY  ENTROPY   CP/CV     GAS   RT/V
  2749  4488   68.02  1000.00   -40.84   241.97  1.2211  4.310   15.782

****************************EXHAUST RESULTS FOLLOW*****************************

  T(K)  T(F)  P(ATM)   P(PSI) ENTHALPY  ENTROPY   CP/CV     GAS   RT/V
  1326  1927    1.00    14.70  -113.10   241.97  1.2583  4.296    0.233

**********PERFORMANCE:  FROZEN ON FIRST LINE, SHIFTING ON SECOND LINE**********

 IMPULSE   IS EX      T*      P*      C*    ISP*  OPT-EX  D-ISP      A*M   EX-T
   248.8  1.2204    2473   38.08  4987.5            8.43  408.8  0.15505   1283
   250.8  1.2023    2506   38.41  5022.7   193.3    8.56  412.2  0.15615   1326

238 product species considered (cea database)

These are ideal thermochemical predictions for an example recipe, not measured results.