What are the pressure difference and temperature condition for the nozzles (orifices) sized by scfm air.
If you know those conditions for the air and the Gas constant and the isentropic exponent "k' and the temperature of the steam then you can translate between air flow rate and steam flow rate.
I have the gas constants "R" and the isentropic exponent "k' for air and steam but you need to supply the steam temperature and the orifice air calibration conditions.