Fast Running Models
OBJECTIVES:
- To explore FRM tutorial from GT-SUITE
- Build FRM Model for the following configurations using FRM builder approach:
- Bore 102mm stroke 115mm CR17
- no. of cylinder 6
- CI Engine
- Twin Scroll Turbine
- GT Controller
Exploration of FRM tutorial
Here the approach used is FRM converter i.e. conversion of a detailed model to FRM. The whole process is carried out in the following 8 steps. Briefly, for FRM model, we combine all the small volumes into a single volume. For e.g., in this case, 4 manifolds, 4 runners, etc... We need to combine all these into a single volume.
STEP1
This is a detailed 4 cylinder GDI Turbo model with 4 valve cylinder, 2 intakes and exhaust ports, with a separate runner for each cylinder.
STEP2
Here, the 2 exhaust valves, ports are converted to a single entity for each of the cylinders as seen in the model below. Also, small subvolumes after Turbine are merged into single volume.
STEP3
Like step 2, here, 2 intake ports and 2 valves are converted into a single valve and a port.
STEP4
After the compressor, many small subvolumes and intercooler are removed and are merged into a larger volume.
STEP5
Airbox in and Airbox out along with 3 to 4 pipe connections are removed between the end environment and compressor.
STEP6
In this step, the exhaust system is further reduced and all the 4 runners of the 4 cylinders are merged into a single runner which is connected to the Turbine.
STEP7
STEP8
To Build Fast Running Model with the given configuration
The main model consists of FRM Intake, Turbo-Charger, FRM Diesel, FRM Exhaust, FRM EGR Controller, ControllerDInj, Receive Signal Controller, Send Signal.
Below are some of the important detailed models of the components seen in the above image.
Simulations were run for 25 different cases with loads 100%,80%,60%,40%,20% along with 4000rpm, 3500rpm, 3000rpm, 2500rpm, 2000rpm for each load. Target boost pressure of 2.8bar for 100% load, 2.6bar for 80% load, 2.4bar for 60% load, 2.2bar for 40% load and 2bar for 20% load.
1. Compressor Map
Below is the compressor map with 25 operating points as described above from 100% load to 20% load. We observe a downward trend of operating point as we go from 100% load to 20% load.
2. Turbine Map
Almost all the operating points for the turbine map falls under the highest efficiency zone.
3. Pressure Plot