New Anti Lag Turbo System

[SIAhmad]

Hi everyone, this is my first post. I'm 18 years old, studying mechanical engineering and recently had an interesting idea. That was to use a micro jet engine to provide the exhaust gasses to spool the turbo, thus lag is eliminated and boost pressure is constantly maintained at maximum pressure and controlled via the wastegate. Rather than keep it an idea I went ahead and have built a prototype. In principle it shouldn't destroy the turbo like a Rally car anti lag system, and provides higher airflow at much higher pressures than a conventional 2litre race engine. [url|http://thumbsnap.com/sT0kE0fN[/url]


Looking forward to see what you think. Might be a pretty stupid idea that I wasted my time and money on but I had fun doing it.

[SIAhmad]

Hi everyone, thanks for the replies.
Of course there will be challenges in reducing the back pressure to the turbine which could cause it to cut out, but this can be fixed with incremental changes to the angle and distance it is from the turbo exhaust inlet. The turbine requires about 2.5s from idle to full throttle, mainly due to its lightweight titanium core. It could be incorporated with the actual turbo exhaust manifold to add additional exhaust flow on braking and gear changes to keep the turbo spooled up continuously. Fuel consumption is 195g/min at full throttle and turbine weight with ancillaries is about 855g. Need to get a CNC machined turbine mount to properly bolt the it on without pressure leaks, but am a bit low on cash at the moment being a student.

[SIAhmad]

Thanks for reply, what you are saying was my fear aswell, as Bernoulli's equation dictates a loss in pressure due to high velocity, and back pressure would cause the turbine to overheat. Looks like i'm going have to find a different way to do this. A way in which the pressure is increased before it enters the turbo, this could be done by finding a way to decrease the turbines exhaust velocity. Then I'll need to find a way of cooling the combustor so it dosen't melt. Bit more work than I imagined, but this is a good engineering exercise for me in terms of thermo and flow dynamics.

[SIAhmad]

Getting the jet to drive a supercharger is a exceptionally difficult task with the budget I'm on. I cant use the jet directly into the combustion chamber because the oxygen has been burnt out of the air.

[SIAhmad]

The goal I was going for was to basically keep the turbo spooled at all engine RPM ranges. Meaning the engine would respond as though it was naturally aspirated. As MaxTorque highlights this will only be possible using a much larger turbine due to thermal and flow constraints. To re configure the micro turbine system will require a major budget and lots of time which I don't have. So I am going to have to think of a new way round the problem. Electric I think probably will be the way to go, I could get something like a YASA-400 electric motor with a 20:1 planetary gearbox, which kicks in through a clutch to keep the turbo spooled up when it drops in speed. It will work much like an MGU-H in F1.

[SIAhmad]

Looks amazing max torque, I can imagine it being a pretty difficult task. Which part in designing it did you find the hardest?
Any idea why they aren't used more commonly in production vehicles? Is the cost prohibitive / reliability?

Edited by SIAhmad on Sunday 29th November 17:15