Challenge

Week 9.1: Turbo Charger Simulation Project

RReethu G23 Dec 2021

Turbo charger

Introduction:

Turbo charger is a forced induction device that increases a internal combustion engine power output by forcing extra compressed air into the combustion chamber.

A turbocharger consists of three main components which are as follows:

Turbine
Compressor
Housing

Turbine & Compressor are placed in separate chambers & they are connected by a common shaft. This shaft is supported by pair bearing & the bearing is lubricated by the engine oil. When it comes to location turbocharger is placed close to the engine exhaust manifold in order to avoid engine loss.

Objective:-

To Simulate the fluid flow through the Turbocharger in order to find the impeller speed for the following 3 different pressure ratios :

Pressure ratio = 2
Pressure ratio = 2.5
Pressure ratio = 3

Geometry:

The Turbo charger geometry was imported into converge.

Grid Control:

Element size:dx = 4e-3m, dy = 4e-3m & dz = 4e-3m

Case setup:

Application: General Flow
Solver: Transient solver
Simulation Type: Liquid
Material: Air
Species: H2O
Simulation mode: Full hydrodynamic
Simulation time parameters:
Start time:0 sec
End time:0.006 sec
Region & Initialization:
Created a region for initializing the setup
Boundary conditions
Inlet - Inflow - Pressure - 300000 pa and Temperature 800k
Pressure ratio- 2,2.5 and 3
Outlet - Outflow - Pressure - 100000 pa and Temperature 300k
Turbine - Wall - motion type - FSI at 300k
Casing - Wall - Law of wall at 400k
Turbulence Model - K epsilon
The time interval for writing 3D output data files: 6e-5 sec
The time interval for writing text output:1e-5 sec
The time interval for writing restarting output:6e-5sec
Maximum number of restart file saved:3