Marine Ship Turbochargers:

Models and Experiments

Abstract:

Turbocharger is the most vital component in the engine, which could directly impact on the overall performance. So, it has a great realistic significance to research the operating regulation of turbocharger. However, because of the more complex structure of tur-bocharger, simulation model building and performance testing has been faced great challenges. This project is focus on the simu-lation model of turbocharger and evaluates the changing regulation of performance about main turbocharger component under different operating conditions.

1. Introduction

● The air inlet of turbocharger is connected with the exhaust manifold of the engine.

● After combustion in cylinder, the high temperature exhaust gas is vented out from the engine and piped to the inside of turbocharger.

● Under the impact of exhaust gas, the turbine starts to rotate with high speed and drives the coaxial impeller

in compressor to rotate together, which could forcibly compress the air into cylinder[1].

2. Characteristic curve

● Rotation rate, flow rate, pressure ratio and efficiency are the 4 primary parame-

ters in the characteristic curve. They are constantly changing and influence each

other.

● The 2D graph shows the relationship between pressure ratio and flow rate un-

der several different speeds.

● The relative error is shown to explain that whether the fitting method is feasible

or not, and how accurate could achieve about this fitting functional equation.

● The 3D graph could demonstrate the relationship among pressure ratio, rotation

speed and flow rate in fixed speeds.

● The 3D curve surface directly reveals the overall relation.

3. Simulink

The model of turbocharger is built on

the basis of physical process which is

including temperature, torque and

energy. The simulation model is es-

sentially the description of the ther-

mal physics of this system.

4. Results of performance

● The 2D graph shows the relationship between performance (including outlet

temperature, torque and energy) and flow rate under several different speeds.

● The 3D graph could demonstrate the relationship among performance, rotation

speed and flow rate in fixed speeds.

● The 3D curve surface directly reveals the overall variation tendency.

5. Conclusion

Turbocharger component has an important role to play in engine. The operating principle provides an evi-

dence for mathematical model. Based on the mathematical model, the fitting method about two-step one

variable has been proposed to fit characteristic curve. Then, the software of Matlab/Simulink has been util-

ized to build the simulation model. Eventually, the final results about changing rules of key parameters and

properties under the different operating conditions has been obtained.

Through the simulation analysis of turbocharger, it mainly researches the variation regulation of character-

istic curve and performance of compressor and turbine, and it has some reference significance to the

whole turbocharger component and relationship between the sub-systems.

Name: Hui Li

Supervisor: XianDong Ma

Department of Engineering Lancaster univer-

sity

Lancaster, Lancashire LA1 4YR, UK

h.li1@lancaster.ac.uk

Reference：

[1] Naonori, S., & Hiroki. M. (2014). Development of power supply system with hybrid turbocharger for marine application. JFE

Technical Report, No. 32, p. 91–94