Chemical Cooling-Heat Soak aid

[Killerbee]

Quoting here to keep the other thread OT.:hug:

Do yall think a standard 220 psi water/meth pump with lines plumed preturbo will atomize the water enough to not cause turbo erosion at the wheel?

No...I mean yes. I don't think that the pressure is terribly important, location is.

The biggest mistake made with pre-C w/i, and where most of its bad rap stems, is locating nozzles far upstream, in the large intake tube. Regardless of pressure, all this does is promote agglomeration of the water drops on the opposite wall, and form a steady stream that reaches and erodes the higher velocity blade tips. The higher the pump pressure, it could be argued, the faster it reaches the opposite wall.

I believe that done correctly, the nozzle must be located within a couple inches of the compressor. If using a stock mouthpiece, for example, there is a 300+ mph flow at the compressor. This is comparable to the water nozzle exit velocity. When combined, the drops travel in an arc, never reaching the opposite wall.

This conveniently allows for changing the pressure to change the nozzle exit velocity, at attempt to strategize the drop distribution on the compressor. The shear destructive nature of 120,000 rpm on the water drop, plus the 400 degrees on the other side, should permit explosive latent heat absorbtion.

Doing this negates the stream, and allows more penetration into the slower center portion. Very little erosion can occur IMO. Too little to be a practical concern, especially when compared to things like the material stress of 35 psi, etc.

Also, worst case scenario, the compressor is relatively affordable to replace, IIRC it bolts on. (anybody done this?)

I designed a center discharge nozzle mount last year, then chose to abandon because of my concerns over material fatigue, from flutter and vibration, iow FOD concern. I will probably go ahead with something this year, likely mounted on the mouthpiece wall, right next to the compressor. This has the safest compromise of features IMO, and no added restriction from something else in the high velocity airstream. i say let the compressor do the mixing, there is no better blender.

The only safer alternative IMO, is a fog array of 10 or more nozzle under 1000 psi, this is complicated and riddled with practical design issues.

 

[SmokeShow]

nice post... thanks for sharing!


any benefit to injecting POST-charger or even post-INTERCOOLER???


I'd think it may be alright to inject pre-intercooler as it would help the intercooler actually cool the air charge and take longer or eliminate heat soak of the intercooler. Does that make sense???


C-ya

 

[Turbotug]

That all sounds familiar.

 

[dmaxtruck]

nice post... thanks for sharing!


any benefit to injecting POST-charger or even post-INTERCOOLER???


I'd think it may be alright to inject pre-intercooler as it would help the intercooler actually cool the air charge and take longer or eliminate heat soak of the intercooler. Does that make sense???


C-ya

I would think that pre-IC would eventually create a buildup of crud in the bottom of the IC. I know, I know, I know, it's pressurized... but still, the ability for water to get into places it's not -supposed- to be and create corrosion etc is phenominal.

Waterproof interlocking vinyl sheet-pile on bulkheads is a great example. You couldn't get water to come through the interlocking seams on those things if you had a firehose aimed at the seam. Yet you excavate behind one and the water is there.... crazy stuff that H20 crap!

 

[Killerbee]

any benefit to injecting POST-charger or even post-INTERCOOLER???

to egt perhaps, but nothing else IMO. Agglomeration still applies.

Even if you could design around this, the other problem is time. An ingested air parcel at WOT spends under .5 seconds from airbox to exhaust manifold. getting a water drop evaporated in less than this, is a practical non-event. In theory, the blade collision pulverizes a 100 micron drop into, say, 5 micron drops, 8000 of them (it may it reality be smaller than 5 micron). When this happens, the air/water interface surface area goes up by a factor of 20. or 20 times the evaporation rate. When exposed to the 400 degrees, evap can perhaps be completed before the drop even reaches the CAC. And even if it doesn't, w/i is not a full time event. I personally don't think it possible for water to collect in the CAC under WOT conditions. The velocity and high temps just don't pose a hospitable environment for water in liquid state.

Brandon, I'll have to dig up those photos, I just remembered we did pics with the leafblower, LOL.

 

[Turbotug]

Almost time to get it back out. Kept the garage pretty cool too.

 

[bullfrogjohnson]

I believe i am going to try this

Micheal I will be in touch on specifics

 

[Brayden]

I think a very good place for a water nozzle is drilled and tapped into the turbocharger compressor backplate You get all the high pressure air coming from the compressor exducer without introducing it to the comp wheel.

But it does still have a very long trip to get to the cylinders so it may become agglomerated by then.

Good post KillerBee

 

[Killerbee]

yesterdays RH was 3%, highest wildfire danger in a long time.

There are studies that advocate benefits to humidification, and the torque quality. IIRC, makes the combustion more consistent as to LPP.

What I really want to see is if MAF increases by virtue of the quasi-isothermal compression. All the numbers and those pics from last year seem to be MIA.