Systems and methods for automatic control and measurement of oxygen concentration for combustion conditions

A system comprising:

• a gas mixing apparatus configured to:
• generate a gas mixture;
• and
• fill a gas reservoir with the generated gas mixture;
• a combustion chamber configured to:
• receive the gas mixture from the gas mixing apparatus;
• and
• perform a combustion test on a test sample using the received gas mixture;
• and
• a controller configured to:
• select a target oxygen concentration for the gas mixture for the combustion test;
• measure an oxygen concentration in an inlet air gas source received by the gas mixing apparatus;
• control a nitrogen gas flow and an inlet air gas flow from the inlet air gas source to fill the gas reservoir with the gas mixture having the selected target oxygen concentration, based on the measured oxygen concentration in the inlet air gas;
• and
• control outlet of the gas mixture from the gas reservoir for use in the combustion test.

A method comprising:

• selecting, by a controller of a gas mixing system, a target oxygen concentration for a gas mixture for a combustion test;
• measuring, by the controller and using an oxygen sensor, an oxygen concentration in an inlet air gas source or ambient air source received by the gas mixing apparatus;
• controlling, by the controller, a nitrogen gas flow and an inlet air gas flow from the inlet air gas source or ambient air from an ambient air source to fill a gas reservoir of the gas mixing system with the gas mixture having the selected target oxygen concentration, based on the measured oxygen concentration in the inlet air gas or the ambient air;
• and
• outputting, by the controller, the gas mixture from the gas reservoir for use in the combustion test.