Hot Side Turbine Generator/Motor

A

AES

New member
Hey All,

I've been playing with the idea of using a 2-stroke Detroit Diesel for a generator prototype and for those not familiar with a 2 stroke diesel, a blower/supercharger is needed to function and is considered "naturally aspirated" until turbos are used along with the blower.

Eliminating the blower and using an e-charger to provide minimum levels of boost to run at idle and a belt assist generator from a kia to provide continuous power needed to maintain the energy storage system.

However, what if we added exhaust "hot" side turbines connected to motor/generators where at low engine speed they operate as motors providing the scavenging effect needed. High engine speed, high power situations this same system can be used to extract energy to power the intake e-chargers or charge the energy storage system.
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I primarily want to explore using a "push-pull" system where exhaust gasses are "forcefully scavenged" in addition to boost on the intake should make for a very potent combination when maximum power demand is needed.

I'll be testing this system first on something like an LS or chevy straight 6 Atlas but am also looking at the 3800 gm engine.

This is for a client project that owns a salvage yard and we would rather see this type of technology shared and developed instead of squandered.
 
Sounds interesting. I wonder if the generating side will generate enough power to charge the batteries to justify the loss of scavenging? It does sound promising. How big of a diesel are you thinking of putting this thing on? It's going to take one big alternator to provide enough electrical power to run a turbo continuously on a 5.3L LS with any real boost, but I'm not sure you need much. Basically, think of it in terms of horsepower. Between torqamp's results and my tests, we have enough to infer that it takes approximately 4,000 watts to support 200 hp in the 4-6 psi region of boost, if that helps. You'd need about a 350 amp alternator to support 200 hp - the relationship appears to be pretty linear. So to support 600 hp, you'd need a ~1,000 amp alternator.
 
AlexLTDLX said:
Sounds interesting. I wonder if the generating side will generate enough power to charge the batteries to justify the loss of scavenging? It does sound promising. How big of a diesel are you thinking of putting this thing on? It's going to take one big alternator to provide enough electrical power to run a turbo continuously on a 5.3L LS with any real boost, but I'm not sure you need much. Basically, think of it in terms of horsepower. Between torqamp's results and my tests, we have enough to infer that it takes approximately 4,000 watts to support 200 hp in the 4-6 psi region of boost, if that helps. You'd need about a 350 amp alternator to support 200 hp - the relationship appears to be pretty linear. So to support 600 hp, you'd need a ~1,000 amp alternator.
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The detroit diesel is a 16L V8, but I've also got a 2.0L TDI for testing as well. I'm really not a fan of traditional alternator tech and if i'm already going to run a high voltage dc pack it makes sense to run a high voltage brushless motor to ensure efficient charging. Hyundia hybrid alt is good for 20kw at 200-300V and can be had on ebay for under $100, I'll use one for charging and use a dc-dc for the 12V system. In addition, one combined with a planetary gearset would work well on the compressor side of things.
 
Can you send a link to the alternator you're talking about? The one I saw was just a (admittedly high capacity alternator - 250 amp) regular alternator. That has definitely piqued my interest for charging my pack.
 
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