[mohsinmkhan]

can anybody tell me how to Vary AFR in CONVERGE,particularly in which part of case setup?

[KapilO8]

You can change the fuel mass injected during the spray modelling setup according to the AFR needed.

It will vary for Direct injection & port injection setups where you have to find out fraction injected mass inside the combustion chamber if it is PFI

[mohsinmkhan]

but where we have given mass of air? without it how can we decide AFR?

[KapilO8]

Originally Posted by mohsinmkhan

but where we have given mass of air? without it how can we decide AFR?

You can obtain it from 1. Experimental motored runs or 2. Cold flow analysis of the engine.

[mohsinmkhan]

but,in CONVERGE particularly where?

[mohsinmkhan]

Originally Posted by KapilO8

You can obtain it from 1. Experimental motored runs or 2. Cold flow analysis of the engine.

But in CONVERGE Particularly where we can do that?

[jetcheve]

Originally Posted by mohsinmkhan

But in CONVERGE Particularly where we can do that?

Good morning!

As mentioned previously there are several ways of varying AFR.

- In a premixed engine you can vary the boundary conditions at inflow in boundary.in to adjust the species mass fraction at the inflow to the engine.
- In a non-premixed, liquid fueled engine you can either change the boundary condition at inflow to adjust the mass flow rate of fresh air or adjust the total mass injected in the spray.in.

If you are running a different type of engine, please let us know and we'd be happy to give you some other options to vary AFR that appropriate for your case.

Please, let me know if this answers your question.

Thanks!

- John

[mohsinmkhan]

Originally Posted by jetcheve

Good morning!

As mentioned previously there are several ways of varying AFR.

- In a premixed engine you can vary the boundary conditions at inflow in boundary.in to adjust the species mass fraction at the inflow to the engine.
- In a non-premixed, liquid fueled engine you can either change the boundary condition at inflow to adjust the mass flow rate of fresh air or adjust the total mass injected in the spray.in.

If you are running a different type of engine, please let us know and we'd be happy to give you some other options to vary AFR that appropriate for your case.

Please, let me know if this answers your question.

Thanks!

- John

So sir, that means it is not possible to vary AFR for close cycle analysis where we are considering only compression and power stroke without intake and exhaust stroke for cases like direct injection. because there we can only give mass flow value for parcel coming from injector. Since inflow boundary is not there for closed chamber analysis, Is it right Sir? m having doubt over this, kindly correct me...

[mohsinmkhan]

Originally Posted by jetcheve

Good morning!

As mentioned previously there are several ways of varying AFR.

- In a premixed engine you can vary the boundary conditions at inflow in boundary.in to adjust the species mass fraction at the inflow to the engine.
- In a non-premixed, liquid fueled engine you can either change the boundary condition at inflow to adjust the mass flow rate of fresh air or adjust the total mass injected in the spray.in.

If you are running a different type of engine, please let us know and we'd be happy to give you some other options to vary AFR that appropriate for your case.

Please, let me know if this answers your question.

Thanks!

- John

And Sir m working on a different case where air is coming through intake manifold as usual but gaseous fuel is coming through injector. So this is the case of non premixed but with gaseous fuel through injector (Direct injection).so in such case, how to vary AFR??