Three Dimensional Visualization for Calculated Distributions of Diesel Spray and Flame in the Combustion Chamber of a D.I. Diesel Engine

1997 ◽  
Author(s):  
Hirofumi Imanishi ◽  
Takuo Yoshizaki ◽  
Taka'aki Satoh ◽  
Keiya Nishida ◽  
Hiroyuki Hiroyasu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Three Dimensional ◽  
Diesel Spray

Model Verification of the Evaporating Diesel Spray Distribution in the Combustion Chamber of a D.I. Diesel Engine

1996 ◽  
Author(s):  
Takuo Yoshizaki ◽  
Keiichiro Yuzaki ◽  
Hiroyuki Hiroyasu ◽  
Hideo Yamashita ◽  
Kazufumi Kaneda ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Model Verification ◽  
Diesel Spray ◽  
Spray Distribution

Air supply system design of a Diesel–Brayton combined cycle engine

2018 ◽  
Vol 233 (4) ◽  
pp. 545-555
Author(s):  
Yuzhi Jin ◽  
Yuping Qian ◽  
Yangjun Zhang ◽  
Weilin Zhuge
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Gas Turbine ◽  
Operation Mode ◽  
Three Dimensional ◽  
Engine Performance ◽  
Supply System ◽  
Combined Cycle ◽  
Air Supply ◽  
Startup Performance

The Diesel–Brayton combined cycle engine was proposed previously to achieve the goal of lower fuel consumption, higher power density and good startup performance under low-temperature conditions. The prototype engine was designed and tested based on an off-the-shelf gas turbine and a diesel engine. To achieve a more compact and lighter design, the air supply system was designed based on the centrifugal compressor of the gas turbine. In the coupling operation mode aiming to generate the maximum power, a large amount of compressed air must be extracted into the diesel engine. The present paper presents the design methodology of the compact air supply system. The bleeding slot configuration was selected based on a parametric study and proven by systematic experiments. Three-dimensional simulations were conducted to investigate the performance and flow field of the compressor. Backflow appeared in several passages of the axial diffuser caused by air bleeding, which further distorted the air flow in the combustion chamber. Such distortion may cause compressor and combustion instabilities. In the future, the combustion chamber and the axial diffuser must be designed in combination with an air bleeding system to improve the engine performance.

Effect of Combustion Chamber Geometry on Emissions From a Single-Cylinder Diesel Engine

2005 ◽  
Author(s):  
Boggavarapu V. V. S. U. Prasad ◽  
R. V. Ravikrishna
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Direct Injection ◽  
Three Dimensional ◽  
Cfd Simulations ◽  
Government Regulations ◽  
Single Cylinder ◽  
Piston Bowl ◽  
Computational Fluid Dynamics Cfd ◽  
Valve Part

Many of the stationary power generation and agricultural pumping applications in India utilize diesel engines. Recently, as per Government regulations, these engines are required to satisfy stringent emissions norms. This forms the motivation for the present study on a stationary, direct-injection, single cylinder, 10 HP diesel engine. The selected engine was not satisfying the norms. The engine has a hemi- spherical piston bowl and an injector with a finite sac volume. The combustion chamber was made re-entrant and the injector was replaced with a sac-less injector. After these modifications, there is a significant change in emission levels. To understand clearly the effect of the combustion chamber geometry on the emission levels, three-dimensional computational fluid dynamics (CFD) simulations have been performed for the complete suction and closed-valve part of the cycle. Comparisons of turbulent kinetic energy and swirl levels of old and new geometries were systematically conducted. In contrary to the expected, that the swirl and turbulence levels are consistently less in the modified geometry than that of original geometry. A third combustion chamber was proposed and tested computationally. It was found that the in the proposed combustion chamber swirl and turbulence levels are much higher than the baseline engine. Thus, the proposed combustion chamber geometry shows significant potential for the engine to meet the prescribed norms.

scholarly journals Combined effects of combustion chamber geometry and injection strategy on combustion and emissions of a diesel engine

2021 ◽  
Vol 268 ◽  
pp. 01026
Author(s):  
Jizhou Zhang ◽  
Fuwu Yan ◽  
Yu Wang
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Fuel Injection ◽  
Direct Injection ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Complete Combustion ◽  
Injection Strategy ◽  
Injection Duration ◽  
Chamber Volume

For a certain type of direct injection diesel engine, a three-dimensional model of a single-cylinder complete combustion chamber and in-take/exhaust port was established. Three-dimensional Computational Fluid Dynamics (CFD) analysis software CONVERGE was used for simulation. The effects of fuel injection strategy and combustion chamber geometry on combustion emissions of diesel engine were studied while the combustion chamber volume, engine compression ratio, total fuel injection quantity and total injection duration were kept unchanged. The results show that the strategy of multiple injection and reasonable shape of combustion chamber can effectively increase the turbulent kinetic energy in cylinder, improve the uniformity of oil-gas mixing, reduce the emission of pollutants, and increase the quality of after injection can further reduce the emissions of NOx and soot.

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