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reilleya / openMotor

An open-source internal ballistics simulator for rocket motor experimenters
GNU General Public License v3.0
400 stars 78 forks source link

Use nozzle stagnation pressure for thrust #110

Open reilleya opened 5 years ago

reilleya commented 5 years ago

Use nozzle stagnation pressure for thrust instead of chamber pressure. See figure 16 of Chuck Roger's departures from ideal performance.

reilleya commented 5 years ago

The method given for correcting port pressure assumes that core area does not change over the length of the motor, so I'm not sure if it is appropriate for all motors oM allows users to make. Rogers does mention that section 6.5.2 of Space Propulsion Analysis describes a method for tapered cores.