Dear Gordon and Jim,
With thanks for your attention, our aims from designing this gun are;
1) reducing cost of fuel consumption in thermal spray procedure by designing a LPG based HVOF
2) increasing pressure of combustion chamber up to 8 bar (with consumption of less than 10 gr/s oxygen-LPG mixture)
3) New design of nozzle which results in higher velocities for obtaining higher density in coatings
4) Replacing the conventional conical converging-diverging nozzles, used for gas fueled HVOFs, by a new design of D-Laval nozzle which is specially designed for LPG usage
5) Obtaining less sensitivity of flame to coolant temperature (inlet water temperature is 20 C)
With Best Regards