Simulation Study on Different Composition Fuels in Lean-Burn CNG Engine

2013 ◽  
Vol 448-453 ◽  
pp. 3430-3433
Author(s):  
Chang Qing Song ◽  
Jun Li ◽  
Da Wei Qu ◽  
Qi Jie Liu
Keyword(s):  
Three Dimensional ◽  
Hydrocarbon Fuel ◽  
Simulation Software ◽  
Combustion Model ◽  
Lean Burn ◽  
Maximum Heat ◽  
Cng Engine ◽  
Valve Opening ◽  
Dimensional Simulation ◽  
Combustion Processes

The Paper has Established a Combustion Model of Lean-Burn CNG Engine by Three-Dimensional Simulation Software AVL FRIE. Based on Test Validation in the Model, the Combustion Processes of Seven CNG Samples were Simulated and Compared from the Intake Valve Closed to the Exhaust Valve Opening. the Effects on Different Composition Fuels for CNG Engine were Researched. the Results Showed that: the Maximum Average Pressure within the Cylinder , the Highest Average Temperature, the Maximum Heat Release Rate, the Initial Mass Fraction of Fuels, CO and NO Formation Increased with the Hydrocarbon Fuel Ratio C/H, the Composition of Heavy Paraffin in CNG Directly Affected the Performance and Service Life of the Engine.

Effect of Different Ignition Methods on Combustion Characteristics of a Turbocharging Lean Burn LPG Engine

2012 ◽  
Vol 443-444 ◽  
pp. 1026-1031
Author(s):  
Da Wei Qu ◽  
Jun Li ◽  
Ying Gao ◽  
Dong Qing Zhou ◽  
Lu Yan Fan ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Three Dimensional ◽  
Propagation Speed ◽  
Propagation Distance ◽  
Spark Ignition ◽  
Simulation Software ◽  
Combustion Model ◽  
Power Performance ◽  
Working Process ◽  
Lean Burn

A turbocharging lean burn LPG engine combustion model is set up by using three-dimensional simulation software. And the numerical simulation of the engine working process is done. Based on the model validation, the effect of the engine working process is calculated and analyzed by comparing with different ignition models (single spark ignition and dual spark ignition) and the simulation results are validated by experiments. The results show that: dual spark ignition (DSI) model as compared to single spark ignition (SSI) model can reduce flame propagation distance, form the stronger swirl rapidly, accelerate the flame propagation speed, reduce knock phenomena, reduce the emission temperature and improve the engine efficiency. Therefore, the engine has better power performance and fuel economy.

Application of the Mechanical Impedance of Body Arm Movement Based on the Virtual Tennis System

2013 ◽  
Vol 791-793 ◽  
pp. 1436-1440
Author(s):  
Ling Hang Yang
Keyword(s):  
Virtual Reality ◽  
Three Dimensional ◽  
Arm Movement ◽  
Mechanical Impedance ◽  
Simulation Software ◽  
Computer Hardware ◽  
Calculation Results ◽  
Virtual System ◽  
Dimensional Simulation ◽  
Theoretical Results

With the development of computer hardware and software technology, virtual reality technology of computer has been widely used in various fields. Virtual teaching process is one of the main applications of virtual reality computer technology. Tennis is one of the most common sports. Tennis process mainly includes the process of catching a ball, serving a ball and hitting a ball. Virtual process of tennis system must establish an accurate numerical simulation model to calculate the mechanical impedance during the arm movement of human. According to this, it builds a model of the mechanical impedance of human arm in tennis virtual system using three-dimensional simulation software in this paper and gets the curve of mechanical impedance through the simulation. Finally, the article compares calculation results with the theoretical results and concludes that the theoretical results and simulation results are basically consistent which provide a theoretical reference for the design of the development of virtual system for the human.

Predicting the Performance and Emissions Characteristics of a Medium Duty Engine Retrofitted with Compressed Natural Gas System Using 1-Dimensional Software

2014 ◽  
Vol 699 ◽  
pp. 702-707
Author(s):  
Ahmad Jais Alimin ◽  
Muhammad Yusri Ismail ◽  
Shahrul Azmir Osman
Keyword(s):  
Natural Gas ◽  
Alternative Fuel ◽  
Simulation Software ◽  
Compressed Natural Gas ◽  
Operational Conditions ◽  
Performance And Emissions ◽  
Power Models ◽  
Cng Engine ◽  
Experimental Process ◽  
Dimensional Simulation

The rise of crude oil price and the implications of exhaust emissions to the environment from combustion application call for a new reliable alternative fuel. A potential alternative fuel for compression ignition (C.I.) engine is the compressed natural gas (CNG). For C.I. engines to operate using CNG, or to be converted as a retrofitted CNG engine, further modifications are required. Previous works reported loss in brake power (BP) and increase in hydrocarbon (HC) emission for C.I. engine retrofitted with CNG fuelling. Verification of performance characteristics for CNG retrofitted engine through experimental analysis requires high cost and is very time consuming. Thus, a 1-Dimensional simulation software, GT-Power, was introduced in this study to reduce the experimental process and setup. A 4-cylinder medium duty C.I. engine (DE) and CNG retrofitted engine (RE) GT-Power models were used in this simulation work over various operational conditions: low, medium and high load conditions. As compared with DE model, results from RE model showed that RE model achieved an average 4.9% improvement for brake specific fuel consumption (BSFC) and loss in BP by 37.3%. For nitrogen oxides (NOX) and carbon dioxides (CO2) RE model predicted reduction of 48.1% (engine mode 1-9) and 33.4% (all engine modes), respectively. Moreover, RE produced 72.4% more carbon monoxide (CO) and 90.3% more HC emission.

Development and validation of a novel quasi-dimensional combustion model for un-scavenged prechamber gas engines with numerical simulations and engine experiments

2020 ◽  
pp. 146808742095133 ◽  
Author(s):  
Konstantinos Bardis ◽  
Panagiotis Kyrtatos ◽  
Guoqing Xu ◽  
Christophe Barro ◽  
Yuri Martin Wright ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Design Parameters ◽  
Combustion Model ◽  
Experimental Investigations ◽  
Computationally Efficient ◽  
Lean Burn ◽  
Dimensional Models ◽  
Three Dimensional Models

Lean-burn gas engines equipped with an un-scavenged prechamber have proven to reduce nitrogen oxides (NOx) emissions and fuel consumption, while mitigating combustion cycle-to-cycle fluctuations and unburned hydrocarbon (UHC) emissions. However, the performance of a prechamber gas engine is largely dependent on the prechamber design, which has to be optimised for the particular main chamber geometry and the foreseen engine operating conditions. Optimisation of such complex engine components relies partly on computationally efficient simulation tools, such as quasi and zero-dimensional models, since extensive experimental investigations can be costly and time-consuming. This article presents a newly developed quasi-dimensional (Q-D) combustion model for un-scavenged prechamber gas engines, which is motivated by the need for reliable low order models to optimise the principle design parameters of the prechamber. Our fundamental aim is to enhance the predictability and robustness of the proposed model with the inclusion of the following: (i) Formal derivation of the combustion and flow submodels via reduction of the corresponding three-dimensional models. (ii) Individual validation of the various submodels. (iii) Combined use of numerical simulations and experiments for the model validation. The resulting model shows very good agreement with the numerical simulations and the experiments from two different engines with various prechamber geometries using a set of fixed calibration parameters.

IBSIMU: A three-dimensional simulation software for charged particle optics

2010 ◽  
Vol 81 (2) ◽  
pp. 02B703 ◽  
Author(s):  
T. Kalvas ◽  
O. Tarvainen ◽  
T. Ropponen ◽  
O. Steczkiewicz ◽  
J. Ärje ◽  
...  
Keyword(s):  
Charged Particle ◽  
Three Dimensional ◽  
Simulation Software ◽  
Charged Particle Optics ◽  
Dimensional Simulation ◽  
Particle Optics

Simulation Study about Dual Spark Plug Position for the CNG Engine Combustion Process

2013 ◽  
Vol 712-715 ◽  
pp. 1197-1200 ◽  
Author(s):  
Chang Qing Song ◽  
Jun Li ◽  
Da Wei Qu ◽  
Kai Yu
Keyword(s):  
Flame Propagation ◽  
Combustion Process ◽  
Three Dimensional ◽  
Propagation Distance ◽  
Simulation Software ◽  
Flame Surface ◽  
Flame Kernel ◽  
Spark Plug ◽  
Cng Engine ◽  
Combustion Speed

The paper has modeled and simulated the combustion process of big bore CNG engine by three-dimensional simulation software AVL FRIE. Based on test validation in the model, the effect on position of the dual spark plug for cylinder initial flame kernel development and flame propagation process was researched. The results showed that: When A=0.5, the flame propagation distance shortened by half, a certain intensity of turbulence formed when the compression stroke ended, the combustion speed was the fastest, the combustion duration was the shortest. If dual spark plug spacing is too small, the two flames meet prematurely will cause interfere with each other, and reduce the combustion speed of the overlapping region of the flame surface, increase the heat losses. Otherwise,if the distance is too large , close to the combustion chamber wall, the combustion space is narrow, the flame propagation space is restricted, then flame development is slow.

scholarly journals Automatic Generation of Locomotion Patterns for Soft Modular Reconfigurable Robots

2019 ◽  
Vol 10 (1) ◽  
pp. 294 ◽  
Author(s):  
Xin Sui ◽  
Hegao Cai ◽  
Dongyang Bie ◽  
Yu Zhang ◽  
Jie Zhao ◽  
...  
Keyword(s):  
Parametric Design ◽  
Three Dimensional ◽  
Structural Complexity ◽  
Automatic Generation ◽  
Simulation Software ◽  
Modular Robots ◽  
Simulation Platform ◽  
Modular Robot ◽  
Dimensional Simulation ◽  
Multi Body

In recent years, soft modular robots have become popular among researchers with the development of soft robotics. However, the absence of a visual 3D simulation platform for soft modular robots hold back the development of the field. The three-dimensional simulation platform plays an important role in the field of multi-body robots. It can shorten the design cycle, reduce costs, and verify the effectiveness of the optimization algorithm expediently. Equally importantly, evolutionary computation is a very effective method for designing the controller of multi-body robots and soft robots with hyper redundancy and large parametric design space. In this paper, a tradeoff between the structural complexity of the soft modular robot and computational power of the simulation software is made. A reconfigurable soft modular robot is designed, and the open-source simulation software VOXCAD is re-developed to simulate the actual soft robot. The evolutionary algorithm is also applied to search for the most efficient motion pattern for an established configuration in VOXCAD, and experiments are conducted to validate the results.

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