Characteristics of Exhaust Gas Pulsation of Constant Pressure Turbo-Charged Diesel Engines

1980 ◽  
Vol 102 (4) ◽  
pp. 827-835 ◽  
Author(s):  
T. Azuma ◽  
Y. Tokunaga ◽  
T. Yura
Keyword(s):  
Diesel Engines ◽  
Gas Flow ◽  
Flow Model ◽  
Constant Pressure ◽  
Simulation System ◽  
Exhaust Gas ◽  
Effective Pressure ◽  
Charge System ◽  
Turbo Charge ◽  
Marine Diesel

The constant pressure turbo-charge system has now been increasingly adopted for marine diesel engines because of its higher thermal efficiency in the range of higher mean effective pressure. However, it seems that there has been no paper published on the exhaust gas pulsation of this sytem. In this study, a gas flow model of the constant pressure turbo-charged diesel engines was assumed as a basic and fundamental one, and an investigation was made of it. As a result, some characteristics of the exhaust gas pulsation of this system have been clarified and a mathematical simulation system has been established. It must be emphasized that the filling and emptying method which neglects wave propagation cannot simulate the pulsation, although it can simulate the average exhaust gas pressure and temperature of this system.

Some Aspects of Constant Pressure Turbocharged Marine Diesel Engines of Medium and Low Speed

1983 ◽  
Vol 105 (3) ◽  
pp. 697-711 ◽  
Author(s):  
T. Azuma ◽  
T. Yura ◽  
Y. Tokunaga
Keyword(s):  
Unsteady Flow ◽  
Diesel Engines ◽  
Thermal Efficiency ◽  
Constant Pressure ◽  
Pressure Fluctuations ◽  
Characteristic Method ◽  
Exhaust Gas ◽  
Effective Pressure ◽  
Flow Equations ◽  
Marine Diesel

The constant pressure turbocharge system is widely used in marine diesel engines because of its high thermal efficiency. This study has been made to establish a simulation system for exhaust gas pulsation of the constant pressure turbocharge system and to clarify its characteristics. The previous paper reported that the pressure fluctuations measured on test units and some engines agreed very well with those simulated by the scheme developed in this study. The study used the characteristic method for solving the differential equations of unsteady flow. This report will first discuss the high thermal efficiency of this turbocharge system in the range of high mean effective pressure, then it will show the advantages of the two-step Lax-Wendroff’s method in solving the unsteady flow equations in comparison with the characteristic method. Furthermore, it will present some characteristics of the pulsation and the unique pulsation resonance in this turbocharge system.

Exhaust Gas Pulsation of Constant Pressure Turbo-charged Marine Diesel Engines

1981 ◽  
Vol 16 (2) ◽  
pp. 96-104
Author(s):  
Tadanori Azuma ◽  
Yoshiro Tokunaga ◽  
Tadayoshi Yura
Keyword(s):  
Diesel Engines ◽  
Constant Pressure ◽  
Exhaust Gas ◽  
Marine Diesel

scholarly journals Exhaust Gas Pulsation of Constant Pressure Turbocharged Marine Diesel Engines

1981 ◽  
Vol 16 (12) ◽  
pp. 1001-1010
Author(s):  
Tadanori Azuma ◽  
Tadayoshi Yura ◽  
Yoshiro Tokunaga
Keyword(s):  
Diesel Engines ◽  
Constant Pressure ◽  
Exhaust Gas ◽  
Marine Diesel

scholarly journals Development of On-Board In-Cylinder Gas Flow Model for Heat Loss Estimation of Diesel Engines

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Mitsuhisa Ichiyanagi ◽  
Kazuki Kojima ◽  
Hayao Joji ◽  
Hiroki Matsui ◽  
Takashi Suzuki
Keyword(s):  
Heat Loss ◽  
Diesel Engines ◽  
Gas Flow ◽  
Flow Model ◽  
Loss Estimation

MV “CRYSTAL STAR” Diesel Turbocharger Surge Cause Analysis and Troubleshooting

2014 ◽  
Vol 672-674 ◽  
pp. 1562-1567
Author(s):  
Bin Li ◽  
Shou Jun Zhang
Keyword(s):  
Working Conditions ◽  
Diesel Engines ◽  
Preventive Measures ◽  
Fuel Oil ◽  
Marine Diesel Engine ◽  
Exhaust Gas ◽  
Oil Consumption ◽  
Cause Analysis ◽  
Shipping Costs ◽  
Marine Diesel

Currently shipping costs are increasing sharply due to the rising oil prices. In order to reduce shipping costs, most low-speed two-stroke diesel engines run at low speeds to reduce fuel oil consumption, and this measure might result turbocharger surge. For modern marine diesel engines, the exhaust gas turbochargers are becoming more and more important; their working conditions have a direct impact on the performance of diesel engines, consequently affecting the operation of the ship. Surge will fail a turbocharger to achieve the supercharging ratio, damage the turbocharger components and even lead to a damage accident of the whole turbocharger. Therefore, a good understanding of the reasons for marine diesel engine turbocharger surge will help to prevent and eliminate turbocharger surge in operation. This paper is to make an analysis on the special surge mechanism occurred to the turbocharger on MV "Crystal Star", and propose some appropriate supervisory and preventive measures against the problem.

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