The Science and Design of the Hybrid Rocket Engine by Richard M. Newlands

Author:Richard M. Newlands [Newlands, Richard M.]
Language: eng
Format: epub
Publisher: Lulu.com
Published: 2017-04-20T16:00:00+00:00

and a graph of:

versus mole concentration n bottoms-out at a minimum. So the software would vary the mole proportions of all the main reactions and side reactions it expects to occur (it’s given some intelligence to guess which will occur) until the free energy graph curve is minimised at:

Energy balance

The software is almost there, however, the proportions of the individual gasses derived from minimising Gibbs free energy change with temperature, so the temperature of the gas mix in the combustion chamber now has to be calculated.

Fortunately, this is reasonably straightforward using the conservation of energy principle.

The enthalpy of reaction calculations described earlier assume that the products are formed at the standard temperature of 25 degrees C. The heat released is now used to heat the gas mix up to an initial guess at the chamber temperature.

First, calculate the heat of reaction, using the minimisation of Gibbs free energy to determine the mole concentrations of the constituent gasses in the mix.

Then add the energy released as the reactant parts of the mix are raised from 25 degrees C to the assumed combustion temperature.

Now subtract the heat absorbed by the products parts of the mix as they’re raised from 25 degrees C to the assumed combustion temperature.

Is the answer zero (an energy balance)? If not, alter the guessed temperature and try again: if the answer was +ve, increase the temperature. If –ve, decrease the temperature.

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