Click on the link to download the Combustion Triangle spreadsheet. All credit to Martin Johnson who reverse-engineered the calculations behind the triangle from a rough pencil sketch by Dante Porta. Any errors in the spreadsheet are mine (Chris Newman’s)!
Note: Most of the cells in the spreadsheet are “locked” to prevent inadvertent changes being made to their contents. The exceptions are the pale blue coloured cells which contain parameter values which can be changed. Changing any parameter value in these cells will change the calculated values in the locked cells, and will therefore change the plots at the bottom of the spreadsheet.
Users are free to unlock the spreadsheet as it is not password-protected.