2 supercharging, which uses a prime mover to drive the compression device; and
turbocharging, a method which utilize the exhaust gas to drive the compression device. These methods are having the same objective that is to increase the intake
pressure and the amount of air into the combustion chamber; thus improving the efficiency of the engine. Generally speaking, a turbocharger is more efficient than a
centrifugal supercharger. The scope of this study will be limited on the turbocharging method only.
This study will investigate how the design of a turbocharger’s turbine- compressor assembly affects the efficiency of a turbocharger and will try to improve
the design of the turbine-compressor assembly. Furthermore, finite element analysis will be done on the redesigned models of the assembly to validate the designs. This
study also included machining the prototype of turbine and compressor. 5-axis CNC machining will be used for the machining of the parts.
1.2 Problem Statement
One of the main problems with turbochargers is that they do not provide an immediate power boost when the accelerator pad is pressed, and the car accelerate
forward suddenly when the turbo gets moving. Usually a delay is produced between pressing on the accelerator pedal and the boost. This is due to the loss of energy to
overcome the rotational inertia of the turbine rotor. This problem is usually described as turbo-lag Nice, n.d..
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1.3 Objective of PSM
The aims of this project are to: a
Study and improve the design of a turbocharger turbine-compressor assembly.
b Fabricate a prototype of the design using 5 axis CNC machine.
1.4 Scope of Work
The automotive part chosen for this project is the turbine-compressor assembly inside a turbocharger. The purpose of this project is to study and improve
the design of the turbine-compressor assembly. The main focus is on the turbo-lag. The cause of Turbo-lag will be studied and improved in the project.
In addition, a prototype of the model will be fabricated by using 5-axis CNC machining. Before the real machining takes place, machining simulation will be
performed using CATIA; and the NC code will be generated. The parameters, for instance, feed, speed, and material removal rate MRR involved in the machining
will be recorded as well.
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1.5 Schematic of Project
Chapter 1 describes about the background of the study, project problem statement, and the objective and scope of the study.
Chapter 2 highlighted some literature reviews related to the study, which includes descriptions on turbocharger, turbo-lag, proposed technical solutions for
turbo-lag, CNC machining, CADCAM, and ANSYS CFX. Chapter 3 shows the methodology and the flow of this project in detail from
the beginning. Chapter 4 includes the result of the analysis and the presentation of data.
Chapter 5 provides a general discussion on the design, the results of the study, stressing the significance and implications of the findings of the study.
Chapter 6 makes a conclusion on the study. Suggestions for future study are included in this section as well.
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1.6 Gantt Chart
