Week 10: Project 1 - FULL HYDRO case set up (PFI)

Objective
● To simulate t he Port f uel i njection engine using Converge t o determine i ts performance &
emissions
Port Fuel I njection:P ort f uel-injection systems l ong ago replaced carburettors i n cars because
of t heir efficiency and l ower maintenance requirements. With port f uel-injection, gasoline i s
sprayed i nto t he i ntake manifold, where i t mixes with air, and t hen i s sucked down i nto t he
cylinders. Direct i njection places an i njector on each cylinder, spraying gasoline i nto t he cylinder
itself. Direct i njection l eads t o more efficient engines, as t he gasoline-air mixture burns more
completely. The i ndividual i njectors also ensure t hat each cylinder gets t he same amount of f uel,
and t he spray can be more precisely t imed.
C ase
Step1. Geometry
Engine Geometric Parameters:
Bore=0.13761
Connecting Rod=0.263m
Stroke=0.1651m
Sector angle=60
Step1.Geometry
The geometry has been i mported i n Converge and i t has been diagnosis

From t he above i mage,after diagnosing we can see t hat geometry has multiple error i norder t o
eliminate t his error we will f irst f lag t he boundary & regions,so t hat i t became ease t o eliminate
the error
Regions Flagging
From t he below i mage t he reason behind dividing i ntake port i nto t wo regions i s t o give better
initial & boundary conditions

Boundary Flagging

Boundary Conditions
Now,after boundary & regions f lagging all t he errors have been eliminate using boundary f ence
& patch option which can seen i n t he below i mage.

Step2.Case Setup
● Application:Crank angle-based I C engine
● Analysis:Transient state
● Type:Pressure t ype
● Simualtion mode:Full hydrodynamic
Simulation time parameters:
● Start t ime:-480deg
● End t ime:240deg
● Initial t ime step:1e-7sec
● Minimum t ime step:1e-8sec
● Maximum t ime step:0.0001sec
Physical Model
● Turbulence Model:
○ K_e,RNG
Grid Control:
● Element size:d x = 0.004m, dy = 0.004m,dz = 0.004m
Events:

Temperature

Heat Release

From t he above plot a sudden rise i n t he pressure & t emperature i s because of combustion of
Air-Fuel mixture which l eads t o produce huge energy i n short t ime t his can been i n t he heat
release rate plot t hat maximum heat i s release i n t he comustion process.
Emission

From the above plot it quit clear that concentration of Carbon monoxide is much more higher
then t he other emissions t his because of i ncomplete conversion of carbon i nto f uel.
C onclusion
● Successfully did t he Fully Hyrdo simulation of Port f uel i njection engine.
● Sucessfully determined t he Emissions & t hermodynamic variables f or t he PFI engine.
● Since,our PFI engine i s designed engine not a real engine so,we cannot validated our
results with experimental one.