So after some refinement, as well as component searching, the development of the jet turbine is still moving forward. Below are some images from the start till the current date.
The above are images of the original conceptualization of the Compressor and turbine fans, all mounted on the central shaft that runs through the entire engine. As I mentioned earlier, after further research it was discovered that a radial compressor fan, as opposed to an axial, (as we were first intending to use and as is seen above), would be a better choice if we had any hope of success. So we designed our first radial compressor fan from plywood, above right. This seems strange in a flame breathing jet engine, but when the engine is running or at least being spooled up to some rpm by an air compressor prior to running, all the flame will be directed out the backside and away from this compressor fan, so plywood has been used succesfully in the past on some small units. We unfortunately, misjudged the rapidity of our fuel delivery system, which lit in the combustion chamber much quicker, and more profusely than we expected, and again as mentioned earlier, by the time we got around to jetting in the compressed air for starting, the compressor was…….well, toast. Ahhhhh, live and learn. Add this to the list of things we figure out to do only once in life…..like licking 9-volt batteries……don’t ask. But I don’t recommend it. : )
On a side note, in the images above you can also see the internal shaft connector, just behind the fan blades to the right, that melted, and which we seem to have found a suitable replacement for. Turns out, it was made of aluminum. This is a no-no, as it will in no way withstand the temperatures inside this unit. At this point we are hoping the metals that we are intending to use here will withstand these temperatures. I’m not sure yet, and if they do, what their duration will be. But aluminum….no way.
You also may be asking yourself why a radial instead of an axial compressor. Our goal is simplicity, and quite simply a radial compressor is more simple and efficient than an axial. To get an axial that will produce the same pressure increase that we would get from a radial, we would need three fan blades in sequence and a specially shaped duct to accomplish the same thing we get from the single radial fan slamming the air outward against the sidewalls of the can housing. It still may not be enough to allow this unit to work, but it’s by far the best choice.
Anyway….some more shots.
These above shots are of the construction of the new all metal compressor fan unit. This one shouldn’t burn no matter how stupid I am in the starting process! All very simple to fabricate by the way out of the same tin can stock.
And finally above is the unit on the impromptu test stand we are using for run tests. The shot to the right shows the tail with the turbine fan clearly visible. The shot on the left is the intake where the new metal compressor will be inserted. The “horns” on the outside are the fuel inlet ports, the inserts in these regulate the fuel flow and have been adjusted to reduce this flow so that the next run won’t be quite so flooded. If, and thats a big if, we can even get this unit to self sustain and run, I will then work on attaching a compressing exhaust tube to the tail of the unit in an attempt to gain some thrust and efficiency. First things first though……if this thing will even self sustain and not burn up or mechanically fail in the process…..I will be amazed and impressed.