scholarly journals Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection

Energies ◽  
2018 ◽  
Vol 11 (3) ◽  
pp. 515 ◽  
Author(s):  
Zhaojie Shen ◽  
Wenzheng Cui ◽  
Xiaodong Ju ◽  
Zhongchang Liu ◽  
Shaohua Wu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Numerical Investigation ◽  
Fuel Injection ◽  
Heavy Duty ◽  
Two Stage ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Aerodynamic Optimization of High Pressure Turbine and Interstage Duct in a Two-Stage Air System for a Heavy-Duty Diesel Engine

2017 ◽  
Author(s):  
Uswah Khairuddin ◽  
Aaron W. Costall
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Operating Point ◽  
Heavy Duty ◽  
Aerodynamic Optimization ◽  
High Pressure Turbine ◽  
Two Stage ◽  
Turbine Wheel ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Turbochargers are a key technology for reducing the fuel consumption and CO2 emissions of heavy-duty internal combustion engines by enabling greater power density, which is essential for engine downsizing and downspeeding. This in turn raises turbine expansion ratio levels and drives the shift to air systems with multiple stages, which also implies the need for interconnecting ducting, all of which is subject to tight packaging constraints. This paper considers the challenges in the aerodynamic optimization of the exhaust side of a two-stage air system for a Caterpillar 4.4-litre heavy-duty diesel engine, focusing on the high pressure turbine wheel and interstage duct. Using the current production designs as a baseline, a genetic algorithm-based aerodynamic optimization process was carried out separately for the wheel and duct components in order to minimize the computational effort required to evaluate seven key operating points. While efficiency was a clear choice for the cost function for turbine wheel optimization, the most appropriate objective for interstage duct optimization was less certain, and so this paper also explores the resulting effect of optimizing the duct design for different objectives. Results of the optimization generated differing turbine wheel and interstage duct designs depending on the corresponding operating point, thus it was important to check the performance of these components at every other operating point, in order to determine the most appropriate designs to carry forward. Once the best compromise high pressure turbine wheel and interstage duct designs were chosen, prototypes of both were manufactured and then tested together against the baseline designs to validate the CFD predictions. The best performing high pressure turbine design, wheel A, was predicted to show an efficiency improvement of 2.15 percentage points, for on-design operation. Meanwhile, the optimized interstage duct contributed a 0.2 and 0.5 percentage-point efficiency increase for the high and low pressure turbines, respectively.

Application of Common Rail Fuel Injection System to a Heavy Duty Diesel Engine

1994 ◽  
Author(s):  
Yoshihisa Yamaki ◽  
Kazutoshi Mori ◽  
Hiroshi Kamikubo ◽  
Susumu Kohketsu ◽  
Kohji Mori ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Common Rail ◽  
Injection System ◽  
Fuel Injection System ◽  
Heavy Duty ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel
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