Simulations and Measurements of a Two-Stage Turbocharged Heavy-Duty Diesel Engine Including EGR in Transient Operation

2008 ◽  
Author(s):  
Niklas Winkler ◽  
Hans-Erik Ångström
Keyword(s):  
Diesel Engine ◽  
Transient Operation ◽  
Heavy Duty ◽  
Two Stage ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

Influence of rail pressure on a two-stage turbocharged heavy-duty diesel engine under transient operation

2016 ◽  
Vol 18 (1) ◽  
pp. 19-29 ◽  
Author(s):  
Z. C. Liu ◽  
K. B. Yu ◽  
J. Tian ◽  
Y. Q. Han ◽  
S. L. Qi ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Rail Pressure ◽  
Transient Operation ◽  
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.

scholarly journals Study of dual-fuel (diesel + natural gas) particle matter and CO2 emissions of a heavy-duty diesel engine during transient operation

2013 ◽  
Vol 153 (2) ◽  
pp. 3-11
Author(s):  
Pedro Barroso ◽  
Xavier Ribas ◽  
Mario Pita ◽  
Judith Do
Keyword(s):  
Diesel Engine ◽  
Natural Gas ◽  
Dual Fuel ◽  
Transient Operation ◽  
Heavy Duty ◽  
Particle Matter ◽  
Heavy Duty Diesel Engine ◽  
Unburned Hydrocarbons ◽  
Heavy Duty Diesel ◽  
The Impact

The aim of this study is to describe the impact on particle matter and co 2 emissions of converting an existing heavy-duty diesel engine for on-highway truck applications to a dual-fuel engine (diesel + natural gas), especially in transient operation. A dual-fuel engine with homogeneous gas charge injection in the intake line before turbocharger was considered. The results showed the feasibility of this kind of technology for transient operation reaching a significant reduction of particle matter plus a decrement in co 2 emissions at the expense of a small decrement of brake fuel conversion efficiency and an increment of unburned hydrocarbons in the exhaust gases.

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
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