FWIW ("for what it's worth") I thought I would relate to you the fueling (on propane) which I used quite successfully--and some other observations based on this general type of VPJ (flat head plate, like the Escopeta, etc.).Jutte wrote:Hi Pryo,
Do you have fuel going into each seperate intake.
That is main fuel line split into three - or do you place the fuel
directely into the combustion chamber?
I was very fortunate in many ways with the Kentfield project (which was also my first successful pulsejet project); in addition to finding a design which was accurately proportioned in the documentation I could access, I made several fortunate assumptions which turned out to be correct, or at least pretty nearly so.
One of the most important was my assumption of the location and proportions of the so-called "fuel injector"; in this case, I chose a simplified injector consisting of a centralized tube (between the 4 intakes) which had radial holes drilled into it and aligned closely with the centerlines of the intakes. This turned out to be quite adequate and even moderately optimal.
Further experience with the general design type reinforced a location for the fuel injector which appeared to focus on the "optimum" location. This seems to be the conjunction of the intake centerline with the inner face of the head plate. My best engines used an injector which faced forward from its mount point on the side of the combustion chamber at an angle of about 45 degrees--but which had its output end immersed in the intake airflow and which was geometrically aligned with the intersecting point described above.
IMO you could do a lot worse than to duplicate this location.
The testing required to find this location involves the construction of a lot of engines, with various experimental injector locations. Don't underestimate the importance of the fueling system and its installation in your engine.
I hope this post saves somebody a lot of time and effort in finding a good location for your fueling system.