Highly boosted engine - University Project

[hunker7]

Hi guys. I am currently doing project on engine modelling, more specifically highly boosted engines (EcoBoost for instance). I have chosen a 5 cylinder 2.2 we are all familiar with

My projects' aim is to model the engine using GT-Suite software, and then explore the operating limits of such highly boosted engine.

Currently I'm doing my literature review, and I need to look into things that limit how much you can boost the engine (knock, EGT...anything else?) and come up with suggestions in regards to downsizing the engine?

Any help would be appreciated

[Kryptonite]

Hey,

do you have a good combustion model of the engine? This is the main step to do such analysis.
You need a lot of engine measurements with cylinder pressure analysis to calibrate your GT model regarding knocking.
What`s your main target of the project? "Downsizing" the engine could have different targets like the low end torque, rated power or time to torque.

[hunker7]

Hey,

do you have a good combustion model of the engine? This is the main step to do such analysis.
You need a lot of engine measurements with cylinder pressure analysis to calibrate your GT model regarding knocking.
What`s your main target of the project? "Downsizing" the engine could have different targets like the low end torque, rated power or time to torque.

I have the engine model itself, but it hasn't been yet properly set up.



Project aim is to explore limitation such heavy turbocharging enforces on the engine operation (not entirely sure what they could be at this point).

[Error404]

I think what he is saying is that you will need some detailed flow data for the ports and combustion chamber, and flame front propagation etc in order for your model to be useful. I guess fir the purposes of the project it is kind of irrelevant as you are exploring the cause and effect rather than specific engine characteristics

[hunker7]

I think what he is saying is that you will need some detailed flow data for the ports and combustion chamber in order for your model to be useful. I guess fir the purposes of the project it is kind of irrelevant as you are exploring the cause and effect rather than specific engine characteristics

Oh I understand. Yes, I chose to base research on 5 cylinder engine, but it's not about this specific engine.

[andy10v]

Currently I'm doing my literature review, and I need to look into things that limit how much you can boost the engine (knock, EGT...anything else?) and come up with suggestions in regards to downsizing the engine?

Any help would be appreciated

Fuel octane, IAT; turbocharger heat/intercooler efficiency, pre ignition, detonation, compression ratio, material failure due to the forces exerted by increased boost pressure? Heat dissipation. Combustion chamber design.

What do you mean by downsizing? Smaller capacity, eg destroke it?

[hunker7]

Fuel octane, IAT; turbocharger heat/intercooler efficiency, pre ignition, detonation, compression ratio, material failure due to the forces exerted by increased boost pressure? Heat dissipation. Combustion chamber design.

What do you mean by downsizing? Smaller capacity, eg destroke it?

Thanks, had some of the thing you suggested written down, but now there are more to research

By downsizing I mean make it a smaller capacity engine but boost the hell out of.

For instance, 3 cylinder ecoboost runs 1.6bar boost.

[andy10v]

So are you currently doing a lit review on small capacity, high output engine boost limits, leading onto a project on 20vt modelling?

[hunker7]

Only small part of the lit review will be about highly boosted engine, majority is about turbo technology that's available, SI engines and background on software.

When talking about turbo technology I need to talk about limitations of turbocharging, things other people have found out and published in regards to this topic. After I go and do my own research and show my findings.

[diesel des]

Turbine drive pressure vs intake pressure is important. This is why many diesel setups use compound Turbos e.g. a large turbo compressor feeding a second smaller turbo compressor in series. And on the exhaust side a small turbine feeding a big turbine in series. This way the pressure ratio is compounded. Big boost with low back pressure.

I did this on a Tdi golf many years ago. When sizing Turbos approx a corrected flow rate factor of 2 is a good starting point for the bigger turbo e.g. the big turbo can flow about twice the smaller turbo.

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[Klobsters]

I won't be any help but may I ask you where are you studying?

[hunker7]

I won't be any help but may I ask you where are you studying?

University of Leeds

[Klobsters]

I'm not that far away in Newcastle then. Will be taking a plane from Leeds when going home for Christmas. BTW, I might send you some questions about driving a Latvian registered car here when I have some time.

[PRY4SNO]

One of the silent masses here.


Reading. Learning.

[Kryptonite]

Turbine drive pressure vs intake pressure is important. This is why many diesel setups use compound Turbos e.g. a large turbo compressor feeding a second smaller turbo compressor in series. And on the exhaust side a small turbine feeding a big turbine in series. This way the pressure ratio is compounded. Big boost with low back pressure.

I did this on a Tdi golf many years ago. When sizing Turbos approx a corrected flow rate factor of 2 is a good starting point for the bigger turbo e.g. the big turbo can flow about twice the smaller turbo.

Sent from my LG-H955 using Tapatalk

You can't compare any high boosted diesel- with a gasoline engine.
The combustion of those engines is very different, especially you haven`t any knock problem with diesel.
Basically leads a high turbine upstream pressure to a high level of knocking on gasoline engines.
Knocking is different from engine to engine. -> You need a very good combustion model from the engine including a knock controller.

I think in the first step, you should set up a few limitations:
-turbo speed
-compressor outlet temperature
-temperature intake manifold
-cylinder peak pressure
-pressure turbine upstream / peak pressure at the exhaust ports
-temperature turbine upstream


In GT-Power you could easily scale the turbo-maps up and down. Play with this function learning by doing