3D Numerical Simulation on the Variable Swirl Intake Process of Diesel Engine

2013 ◽  
Vol 273 ◽  
pp. 143-147
Author(s):  
Yu Fan ◽  
De Xin Liu ◽  
Li Wang
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Three Dimensional ◽  
Control Valve ◽  
Valve Lift ◽  
Opposite Case ◽  
Flow Capacity ◽  
The Comparative Study ◽  
Intake Flow ◽  
Tangential Inlet

To study the flow and swirl characteristics in the variable swirl intake system of a four-valve diesel engine, a numerical simulation with using the three dimensional CFD software AVL-FIRE, was calculated on the intake flow in three types of inlet of the engine. Two swirl-control valve plans are posed and a better plan was selected through the comparative study. The result shows that with a lager valve lift the flow characteristic of spiral inlet is better than that of tangential inlet, and in the opposite case the results are also opposite. The double inlets make the swirl torque increase. When a swirl-control valve is set in the spiral inlet, the variable swirl effect is better, and it ensures better flow capacity and larger swirl ratio range.

scholarly journals CFD Numerical Simulation for Intake Flow Field Design and Effects on Combustion and Emissions of DI Diesel Engine

2019 ◽  
Vol 8 (6S4) ◽  
pp. 287-294
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Flow Field ◽  
Numerical Results ◽  
Excessive Weight ◽  
Di Diesel Engine ◽  
Cfd Numerical Simulation ◽  
Intake Flow ◽  
Flow Field Design

The article takes a gander at inevitable results of logical leisure with whirl enhancing modifications on a right away Injection diesel engine. 4 holes at a diversion over every chamber with estimations of the outlet start from 2, 2.five, 3 and 3.5 mm are through within the chamber with affordable tendency concerning the chamber center factor Numerical guesses are the first-class change to provide clean enduring of the fluid circulate wonder in a DI Diesel Engine. outcomes discover that the unessential beginning of two.five mm (2nd) bypass on an unequalled begin and excessive weight. Spin development just motor vitality massiveness increment with the changing starting widths. The chamber with 2.five mm establishing make a most vital execution improvement while the chambers with excessive broadness than second hole bypass on a to a few diploma chop down execution. whilst the development in partition transversely over develops the move discipline characteristics like spin, the execution decays beyond 2.five mm. considering the execution attitude an ensuing hole gives improved ingesting and finally most outrageous load for the proportional gas implanted. alternate ultimate holes have to a few diploma more fiery debris launch. in view that numerical results exhibited that ensuing hole offers a transcendent. Of all of the splendid numerical modifications the resultant chamber gives stepped forward presentation and lessens the fee and dreary experimentation tests.

Numerical Simulation on Effect of Nozzle-Hole Layout on Spray Characteristics and Combustion in a DI Diesel Engine

2012 ◽  
Vol 476-478 ◽  
pp. 448-452
Author(s):  
Jun Zhang ◽  
Chang Pu Zhao ◽  
Nai Zhuan Chen ◽  
Da Lu Dong ◽  
Bo Zhong
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Direct Injection ◽  
Combustion Process ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Spray Characteristics ◽  
Fuel Atomization ◽  
Di Diesel Engine ◽  
Nozzle Hole

Diesel spray characteristics are closely related to the combustion of the engine where the spray tip penetration and the fuel atomization play a key role especially for direct injection (DI) diesel engine. With different nozzles, the fuel atomization and evaporation will be different thereby affecting the combustion and emission characteristics. A three-dimensional model is built based on the parameters of a DI diesel engine, and its validation is also validated. Three nozzle-hole layouts are designed in this research, including the conventional hole, multi-hole, and group-hole. The spray characteristics and combustion process are studied with three different nozzle-hole layouts by the way of numerical simulation. Further more, the effect of inter-hole spacing of group-hole nozzle on the evaporation rate and combustion process is researched here.

Three-Dimensional Flow Separations in the Diffuser of a Steam Turbine Control Valve

2011 ◽  
Author(s):  
Manuel B. Clari ◽  
Thomas Polklas ◽  
Franz Joos
Keyword(s):  
Steam Turbine ◽  
Flow Separation ◽  
Transient Flow ◽  
Flow Behavior ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Control Valve ◽  
Valve Lift ◽  
Three Dimensional Flow ◽  
Dimensional Flow

A test rig for Steam Turbine Control Valves is operated at the Laboratory of Turbomachinery of the Helmut-Schmidt-University in Hamburg. The control valve unit containing four independently operable valves is a mockup of a typical steam turbine design converted for the use of compressed air with a maximum of 4 bar. The investigations focus on the transient flow behavior and fluid-structure interaction in connection to valve lift and pressure ratio. Validated by the pressure measurements, transient CFD simulations have been conducted identifying the flow separation structures and the transient behavior of the flow inside the valve throat and diffuser in detail. Similar to published separation structures in compressor cascades the transonic flow inside the valve shows three-dimensional flow separation structures and vortices which can be identified by the two-dimensional streamlines on a plane with a constant and infinitesimal distance to the wall. Furthermore a transient development of these patterns can be identified.

Three-Dimensional Simulation of the Intake Port Combination Effect on Intake Flow Characteristic in a Highly Intensified Diesel Engine

2013 ◽  
Vol 744 ◽  
pp. 211-214
Author(s):  
Hong Meng Li ◽  
Guo Xiu Li ◽  
Yuan Jing Hou ◽  
Yu Song Yu
Keyword(s):  
Diesel Engine ◽  
Flow Characteristic ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Intake Port ◽  
Intake Process ◽  
Instantaneous Flow Field ◽  
Dimensional Simulation ◽  
Cfd Method ◽  
Intake Flow

In this paper, the three-dimensional CFD method is used in numerical simulation of the highly intensified diesel engine intake process. The effect of different intake flow compound modes on the highly intensified diesel engine is studied (Including compounded port with helical and tangential intake port, compounded port with two helical intake ports and compounded port with two tangential intake ports). By contrasting the instantaneous flow field, flow characteristic and inlet ability of the three compound modes, the pattern of influence on the inlet flow characteristics by compound modes is analyzed. The results indicate that the combinations of the intake port greatly affect the swirl rate and the inlet ability. The interference of the two helical intake ports is serious, causing more inlet loss. The two helical intake ports have the weakest inlet ability among the three types of intake ports. However, two helical intake ports can cause higher swirl rate. Two tangential intake ports inlet ability is the most excellent, but its swirl rate is the lowest.

NOX and Soot Emissions Numerical Simulation of Diesel Engine Fueled with Biodiesel

2011 ◽  
Vol 337 ◽  
pp. 603-607 ◽  
Author(s):  
Jian Lin Ge ◽  
Dong Tang ◽  
Huan Chen ◽  
Sheng Ji Liu
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Three Dimensional ◽  
Swirl Ratio ◽  
Model Based ◽  
Technical Programs ◽  
Soot Emissions

The three dimensional numerical simulation on NOX and soot emissions was carried out on 186 FA diesel engine fueled with pure diesel and B20 fuel using CFD software Fire v2008 and the generating rule and distribution of NOX and soot of two fuel was described. Through comparison of the measured indicator diagrams, it verified the accuracy of the model. Based on the simulation of the original diesel engine fueling with B20 fuel, the swirl ratio and injection advance angle are optimized and it proposes technical programs to reduce two kinds of emissions simultaneously, which is optimized of NOX and soot emissions, when the swirl ratio is 2.7 and injection advance angle is 352.5°.

Simulation on Combustion Process of 16V240ZJ Diesel Engine

2011 ◽  
Vol 467-469 ◽  
pp. 1499-1504
Author(s):  
Juan Wang ◽  
Feng Wang ◽  
Ming Hai Li
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Flow Field ◽  
Cfd Simulation ◽  
Fuel Injection ◽  
Combustion Process ◽  
Three Dimensional ◽  
Prediction Method ◽  
Limited Information ◽  
Traditional Performance

Three-dimensional computation of spray and combustion in 16V240ZJ diesel engine was performed by CFD numerical simulation tool FIRE. Because of the unceasing change of the temperature and the mixture in the cylinder, traditional performance-prediction method can only supply the limited information. The appearance of numerical simulation brought a bright future for the design and development of the new diesel engine. Combustion is an extremely complex process ,involving flow field, fuel injection and various combustion reactions. By calculus simulation, we have a thorough understanding of the combustion process of 16V240ZJ diesel engine. Through the flow field and concentrative analysis in the cylinder, the effect of advance angle of fuel on combustion process and formation of NOx and soot was investigated. The results show that the advance angle of fuel has a great effect on spray atomization and fuel-air mixture, and consequently influences the combustion and emission. By simulating , we can get the optimal advance angle of fuel for 16V240ZJ diesel engine is 15°BTDC, namely 345°CA, at which, the emissions are fewer ,and the efficiency is better .The CFD simulation has a direct value for optimizing the chamber’s structure and improving the combustion system.

scholarly journals Numerical Study of Intake Flow Optimization using Genetic Algorithm and Artificial Neural Networks

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Neural Network ◽  
Genetic Algorithm ◽  
Diesel Engine ◽  
Internal Combustion Engines ◽  
Direct Injection ◽  
Valve Lift ◽  
Swirl Ratio ◽  
Data Set ◽  
Artificial Neural ◽  
Intake Flow

An easy way to comply with the conference paper formatting requirements is to use this document as a template and simply type your text into it. The increase in the performance of internal combustion engines for diesel engines has driven to follow alternative ways in order to improve the flow characteristics. This paper presents the computational fluid dynamics (CFD) modeling to study the effect of intake flow condition on the swirl ratio and volumetirc efficiency of a direct injection (DI) diesel engine. A single cylinder direct injection diesel engine with two directed intake ports whose outlet is tangential to the wall of the cylinder has been considered. The numerical results from this geometry are validated with the experimental results and published in the literature. In order to enhance the swirl ratio, intake flow in different components are adjusted instead of modifying the intake manifold shape and profile. The experiments are designed by full factorial approach for 3 variables (three components of intake velocity) to study the turbulent flows in a computational way and accomplished using OpenFOAM software. The induced swirl and tumble at the end of compression stroke are also computed and visualized. Numerous computations have been performed in this work during maximum intake valve lift and closed exhaust valve positions. To estimate the reliable data for predicted results, machine learning techniques such as artificial neural network is employed. Information is gathered for different combinations of intake velocity on swirl ratio and volumetric efficiency. Genetic algorithm is applied to fund the fittest data-set for several generations thereby the best optimal flow components are determined. The results from design of experiments approach and neural network techniques are compared.

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