In-Cylinder Flow Field of a Diesel Engine

2007 ◽  
Author(s):  
Ossi Kaario ◽  
Eric Lendormy ◽  
Teemu Sarjovaara ◽  
Martti Larmi ◽  
Pekka Rantanen
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Cylinder Flow

Computation and Validation of In-Cylinder Flow Field, Swirl and Flow Coefficients for a Naturally Aspirated Single Cylinder Diesel Engine

2016 ◽  
Author(s):  
Siva Krishna Reddy Dwarshala ◽  
Suryanarayana Vandana ◽  
Ghodke Pundlik Rambhaji
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Single Cylinder ◽  
Cylinder Flow

Numerical Simulation Study of the Influence of Structural Parameters of Combustion Chamber on In-Cylinder Flow Field of Diesel Engine

2013 ◽  
Vol 860-863 ◽  
pp. 1729-1732
Author(s):  
Guo Cheng Li ◽  
Ping Sun ◽  
Peng Hu
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Combustion Chamber ◽  
Structural Parameters ◽  
Volume Ratio ◽  
Initial Boundary ◽  
Swirl Flow ◽  
Swirl Ratio ◽  
Depth Ratio ◽  
Cylinder Flow

Based on the entity model of the type 4B26 diesel engine, calculated by CFD FIRE and combined with the software BOOST for the initial boundary conditions, the influence of combustion chamber structural parameters, such as boss height, surface-volume ratio and diameter-depth ratio of combustion chamber, on in-cylinder flow field of diesel engine was investigated. The results show that the influence of the boss height on flow field in the cylinder and the transient swirl ratio is obvious, and increasing the boss height is beneficial to urge the formation of mixture rapidly. Reducing the surface-volume ratio is beneficial for improving the maximum transient swirl ratio, and the air strength maintains well also, but has little influence to the retentivity of the swirl intensity. Meanwhile, reducing the diameter-depth ratio does not only improves the air flow movement strengthen in the combustion chamber, but also enhances the maximum transient swirl ratio, and the retentivity of swirl flow movement is satisfying.

In-Cylinder Flow Field Analysis of a Single Cylinder DI Diesel Engine Using PIV and CFD

2003 ◽  
Author(s):  
Wook Choi ◽  
Byung-Chul Choi ◽  
Hyung-Koo Park ◽  
Kyung-Jei Joo ◽  
Je-Hyung Lee
Keyword(s):  
Diesel Engine ◽  
Flow Field ◽  
Field Analysis ◽  
Single Cylinder ◽  
Di Diesel Engine ◽  
Flow Field Analysis ◽  
Cylinder Flow

Numerical Analysis of Swirl Control Strategies in a Four Valve HSDI Diesel Engine

2004 ◽  
Author(s):  
S. Fontanesi ◽  
E. Mattarelli ◽  
L. Montorsi
Keyword(s):  
Flow Field ◽  
Control Strategies ◽  
Cfd Simulations ◽  
Full Load ◽  
Partial Load ◽  
Swirl Intensity ◽  
Port Design ◽  
Current Production ◽  
Hsdi Diesel Engine ◽  
Cylinder Flow

Recent four value HSDI Diesel engines are able to control the swirl intensity, in order to enhance the in-cylinder flow field at partial load without decreasing breathing capabilities at full load. Making reference to a current production engine, the purpose of this paper is to envestiage the influence of port design and flow-control strategies on both engine permeability and in-cylinder flow field. Using previously validated models, 3-D CFD simulations of the intake and compression strokes are performed in order to predict the in-cylinder flow patterns originated by the different configurations. The comparison between the two configurations in terms of airflow at full load indicates that Geometry 2 can trap 3.03% more air than Geometry 1, while the swirl intensity at IVC is reduced (−30%). The closure of one intake valve (the left one) is very effective to enhance the swirl intensity at partial load: the Swirl Ratio at IVC passes from 0.7 to 2.6 for Geometry 1, while for Geometry 2 it varies from 0.4 to 2.9.

scholarly journals Effect of Engine Specifications on In-Cylinder Flow Field in a Spark-Ignited Natural Gas Engine

1999 ◽  
Vol 34 (11) ◽  
pp. 764-773
Author(s):  
Yukiyoshi Fukano ◽  
Kazuo Tachibana ◽  
Shigeo Kida ◽  
Toshikazu Kadota
Keyword(s):  
Natural Gas ◽  
Flow Field ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Cylinder Flow

Investigation of Swirl Ratio Impact on In-Cylinder Flow in a SIDI Optical Engine

2015 ◽  
Author(s):  
Hanyang Zhuang ◽  
David L. S. Hung ◽  
Jie Yang ◽  
Shaoxiong Tian
Keyword(s):  
Flow Field ◽  
Soot Formation ◽  
Flow Characteristics ◽  
Control Valve ◽  
Exhaust Emission ◽  
Swirl Ratio ◽  
Optical Engine ◽  
Crank Angle ◽  
Cylinder Flow ◽  
Intake Swirl

Advanced powertrain technologies have improved engine performance with higher power output, lower exhaust emission, and better controllability. Chief among them is the development of spark-ignition direct-injection (SIDI) engines in which the in-cylinder processes control the air flow motion, fuel-air mixture formation, combustion, and soot formation. Specifically, intake air with strong swirl motion is usually introduced to form a directional in-cylinder flow field. This approach improves the mixing process of air and fuel as well as the propagation of flame. In this study, the effect of intake air swirl on in-cylinder flow characteristics was experimentally investigated. High speed particle image velocimetry (PIV) was conducted in an optical SIDI engine to record the flow field on a swirl plane. The intake air swirl motion was achieved by adjusting the opening of a swirl ratio control valve which was installed in one of the two intake ports in the optical engine. Ten opening angles of the swirl ratio control valve were adjusted to produce an intake swirl ratio from 0.55 to 5.68. The flow structures at the same crank angle degree, but under different swirl ratio, were compared and analyzed using proper orthogonal decomposition (POD). The flow dominant structures and variation structures were interpreted by different POD modes. The first POD mode captured the most dominant flow field structure characteristics; the corresponding mode coefficients showed good linearity with the measured swirl ratio at the compression stroke when the flow was swirling and steady. During the intake stroke, strong intake air motion took place, and the structures and coefficients of the first modes varied along different swirl ratio. These modes captured the flow properties affected by the intake swirl motion. Meanwhile, the second and higher modes captured the variation feature of the flow at various crank angle degrees. In summary, this paper demonstrated a promising approach of using POD to interpret the effectiveness of swirl control valve on in-cylinder swirl flow characteristics, providing better understanding for engine intake system design and optimization.

Investigation of diesel engine in cylinder flow phenomena using CFD cold flow simulation

2019 ◽  
pp. 329-336
Author(s):  
A.K. Azad ◽  
Pobitra Halder ◽  
K. Nanthagopal ◽  
B. Ashok
Keyword(s):  
Diesel Engine ◽  
Flow Simulation ◽  
Cold Flow ◽  
Flow Phenomena ◽  
Cylinder Flow
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