Automotive Optimizing Fluid Flow for Diesel Heads with Pressurized Intake Systems

[Fahlin Racing]

So recently I have started a project of porting diesel heads and see how well I can improve them and of course diving into fluid flow. Now, I know we are dealing with a different beast being pressurized dry-flow system, and I was told the valve job changes when you are turbocharged or supercharged. I was just wondering if somebody could teach me some fluid flow in N/A and forced induction siutuations. I have been told as well that its 'just get the air in and out like a N/A engine' but I just want to cover all points and view it from the physics side of things.

I had read Charles Fayette Taylor's ICE in Theory and Practice, the short appendix in his Vol 1. Throughout either volume of his (1 or 2) I haven't really seen much of anything specifying specifically to forced induction as far as fluid flow, however I could have missed something though, I am not exactly sure.

Realizing our CSA, layout and shape can effect the flow as well as the valve job (including valve) the convergent and divergent sides are equally if not most important using any style of valve. In this case just your basic poppet valve.

:D

 

[Fahlin Racing]

A thought I had was looking at how the Venturi works and how the De Laval Nozzle does too. From what I am told, flow, the only real difference is the density of the charge but improving the general idea is the same as a N/A application.

 

[Highspeed]

Supercharged engines run hotter, so seat width needs to be adjusted. Diesels are fuel-based performance, not air-based, so consider that you can get a lot more exhaust with the same amount of air when the fuel supply jumps up. Overall though, it's just an air passage, but the exhaust has to work harder in diesels. HTH

 

[Fahlin Racing]

After some reading of gas dynamics the mentioning of internal energy referring to the simple gases rely on energy within the system. Example given was temperature and pressure of what a gas inside a port depends on. After that they mention what is known as a 'body force', would a turbocharger produce the body force the gas relies on? would that be a good correlation since gravity can be used as body force?