Modeling and Computational Analysis of Diesel Engine Working Process in Plateau Environment

2014 ◽  
Vol 496-500 ◽  
pp. 804-807
Author(s):  
Xian Cheng Wang ◽  
Ruo Ting Li ◽  
Xing He ◽  
Jun Biao Hu
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Simulation Model ◽  
Process Simulation ◽  
Computational Analysis ◽  
Simulation Software ◽  
Maximum Deviation ◽  
Working Process ◽  
Simulation Experiments ◽  
External Characteristics

Using simulation software, numerical simulation and plateau tests are combined to create the plateau diesel engine process simulation model. External characteristics tests of the diesel engine, plateau simulation experiments and plateau vehicle tests are combined to verify the model. The maximum deviation of the results is less 10%. The simulation model is accurate, which provides a way to study plateau environmental adaptation of diesel engines.

The Influence of Measured Trajectory Based Model Parameters Correcting on Simulation Precision of Power System Dynamic Frequency

2013 ◽  
Vol 448-453 ◽  
pp. 2545-2550
Author(s):  
Gang Mu ◽  
Ming Li ◽  
Jun An ◽  
Xing Wei Xu ◽  
Shuai Shao
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Process Simulation ◽  
Northeast China ◽  
Operation Mode ◽  
Measured Data ◽  
Model Parameters ◽  
Conservative Operation ◽  
Generator Frequency ◽  
Dynamic Frequency

Although numerical simulation is an important method of researching dynamic frequency process, obvious deviations have been found between numerical simulation and the measured trajectory in many accidents. And the existing simulation model and parameters cannot describe the actual dynamic process of frequency accurately. Research was carried out on the influence of four parameters to the dynamic frequency process, which based on the WSCC system. The four parameters include the inertia constant of generator, generator frequency coefficient, dead band and turbine intermediate superheating coefficient. Northeast China power grid and measured data are used to verify the above research conclusion. Checking the dynamic frequency process simulation model and parameters can improve the accuracy of dynamic frequency process simulation on the base of the measured trajectory and the physical characteristics of the parameters. It can also give efficient foundation for the setting work of UFLS, overcoming the previous conservative operation mode and so on.

Flow Field Numerical Simulation of Diesel Engine Working Process

2012 ◽  
Vol 468-471 ◽  
pp. 1781-1784
Author(s):  
Zhi Feng Dong ◽  
Yin Song ◽  
Yong Zheng Gu ◽  
Wei Fu
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Flow Field ◽  
Working Condition ◽  
Particle Trajectory ◽  
Fluid Model ◽  
Working Process ◽  
Intake Process ◽  
Transient Numerical Simulation ◽  
Distribution Of Flow

The spatial fluid model in diesel engine was built, and multiphase flow transient numerical simulation of working process of diesel engine was done based on computational fluid dynamics. The visualized result of simulation shows the distribution of flow field, press and particle trajectory which can hardly tested direct under the actual working condition. Swirl formed during the intake process and accompanied the whole working process of diesel engine. Keywords: Diesel engine; Numerical simulation; Flow field; Particle trajectory

Simulation and Experiment Research of Working Process of Exhaust Turbocharged and Intercooled Diesel Engine

2013 ◽  
Vol 744 ◽  
pp. 13-17
Author(s):  
Meng Xiang Liu ◽  
Peng Wang ◽  
Fang Yuan
Keyword(s):  
Diesel Engine ◽  
Characteristic Curve ◽  
Maximum Error ◽  
Simulation Software ◽  
Experiment Research ◽  
Working Process ◽  
Engine Exhaust ◽  
Design And Optimization ◽  
Simulating Calculation ◽  
Simulation And Experiment

In this paper, the working process mathematical models of in-cylinder of the diesel engine, exhaust turbocharger and intercooler are established, as well as the simulating model using simulation Software GT-POWER. Through parameters modification, we built the Map of efficiency characteristic curve of compressor and turbocharger. Targeted at the turbocharged intercooled diesel engine of YC4F92 type, simulating calculation and experimental verification are conducted. It turned out that the simulating value and experimental value matches well and the maximum error value is not more than 5%, which demonstrated the accuracy and reliability of the established model. The established model can works as a tool for the design and optimization of diesel engine.

Dynamics Analysis and Cam Profile Optimal Design of the Valve Train in the Diesel Engine with High Specific Power

2011 ◽  
Vol 308-310 ◽  
pp. 1636-1640 ◽  
Author(s):  
Li Wei Sun ◽  
Tie Xiong Su ◽  
Jun Feng Xu ◽  
Qiang Wang ◽  
Chun Long Xu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Optimal Design ◽  
Dynamic Analysis ◽  
Process Simulation ◽  
Valve Train ◽  
Specific Power ◽  
Intake Port ◽  
Working Process ◽  
High Specific Power ◽  
Cam Profile

The study carries out optimal design for the cam profile of the valve train in a high-specific-power diesel engine. The dynamic analysis on the original cam reveals that the original one, which leads to adequate fullness coefficient, is designed far from the material margins. The fullness coefficient and time area value are selected as the optimization objective, and the piecewise fucntion method is utilized to optimally design the cam profile. The restrictive contidons are applied to each section on the cam. Thus the function and the optimal coeficients are obtained. Then the dynamic analysis and working process simulation on the optimal valve train are carried out, and it proves that the dynamic and intake port performaces of the optimized one are greatly impoved.

Numerical Simulation of Air Flow Arrangement and Energy Conservation of Air-Condition

2012 ◽  
Vol 588-589 ◽  
pp. 1341-1345 ◽  
Author(s):  
Jun Qiang Yang ◽  
Hong Bo Wei ◽  
Ming Jun Li
Keyword(s):  
Numerical Simulation ◽  
Energy Conservation ◽  
Simulation Model ◽  
Energy Saving ◽  
Energy Efficient ◽  
Research Team ◽  
Simulation Software ◽  
Air Distribution ◽  
Small Space ◽  
Energy Effect

In this paper, we study the building air-conditioned room in the small space and establishment the mathematical numerical simulation model which is for the designing and energy saving of the air distribution, We analysis the energy effect on five types of the airflow organization based on simulation software developed by our research team to study the designing and energy saving of the air distribution, and the results show that considering both the two ways of the air distribution is more reasonable and energy-efficient.

3D transient numerical simulation of a helical roots air compressor for FCVs

2021 ◽  
pp. 095440622110145
Author(s):  
Huan Wei ◽  
Linfen Xing ◽  
Bingqi Wang ◽  
Jianmei Feng ◽  
Xueyuan Peng
Keyword(s):  
Numerical Simulation ◽  
Fuel Cell ◽  
Simulation Model ◽  
Pressure Field ◽  
Volumetric Efficiency ◽  
Tip Clearance ◽  
Maximum Deviation ◽  
Air Compressor ◽  
Air Compressors ◽  
Transient Numerical Simulation

Oil-free helical Roots air compressors which have great application potential in air circulation systems for high-power fuel cell systems, such as commercial fuel cell vehicles (FCVs), have the advantages of active adaptation, low cost, large flow rate and high reliability. In this study, a three-dimensional transient numerical simulation model of a helical Roots air compressor was established by considering all leakage clearances. In this study, hexahedral structured dynamic grids were generated in the working chamber and the rotating angle was updated at an increment of 1° to ensure the mesh quality of the entire solving domain. The accuracy of the simulation model was validated using experimental data, and the maximum deviation was less than 4.0%. Based on the simulated results, the pressure field and variation of the pressure field with the rotation angle are presented. It shows that the pressure fluctuation at the discharge side was larger than that at the suction side. The influence of various leakage clearance on the volumetric efficiency was analyzed comparatively. Additionally, the flow field characteristic of clearance was revealed. It is found that the rotor tip clearance was the major factor for the reduction of volumetric efficiency when the size was larger than 0.12 mm instead of the interlobe clearance. It is suggested that more attention should be paid to control the clearance size to ensure the performance of helical Roots air compressors.

A Numerical Simulation of the Working Process of Diesel Engine

2011 ◽  
Vol 291-294 ◽  
pp. 3359-3362
Author(s):  
Qian Wang ◽  
Jing Wang ◽  
Heng Song Ji ◽  
Chen Gu
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Temperature Distribution ◽  
Computational Model ◽  
Optimum Design ◽  
Diesel Engines ◽  
Cylinder Pressure ◽  
Multidimensional Model ◽  
Working Process

Based on the in-cylinder hydrokinetics and by coupling the multidimensional model of in-cylinder combustion and verifying the rationality of the computational model, this thesis uses KIVA-3V program, which has been added a new subprogram, to provide a numerical simulation of the in-cylinder pressure, the temperature and the NOXdistribution and emission of a diesel engine in different injection advance angles, so as to analyze the change of in-cylinder pressure and temperature, and to find out the rules of temperature distribution, the NOXdistribution and emission condition. This thesis is of guiding significance to the better understanding of the performance of diesel engines and to the optimum design and research of the diesels.

Numerical Simulation of Filtration Process of Long Fiber Bundle Filter

2013 ◽  
Vol 791-793 ◽  
pp. 1541-1545
Author(s):  
Zhong Bin Liu ◽  
Huan Wang ◽  
Juan Tang
Keyword(s):  
Numerical Simulation ◽  
Simulation Model ◽  
Simulation Software ◽  
Fluid Simulation ◽  
Fiber Bundles ◽  
Filtration Process ◽  
Effluent Concentration ◽  
Filtration Cycle ◽  
High Efficient ◽  
Filter Layer

on the base of dynamic model of long fiber high efficient filter, simulation model of filtration process of long fiber high efficient filter was established. Fluid simulation software was utilized to do the numerical simulation of filtration process of long fiber high efficient filter and the curve of filter effluent concentration, porosity distribution along the height of filter layer and filtering precision vary with time was obtained. The simulation results showed that simulation model can be used to measure and calculate the filtering precision, effective filtration cycle and filter effluent concentration of long fiber bundles filter under the conditions of different initial filter speed, other fiber diameter, and various fiber bundles loading quantity.

Simulation Model for Cooling Panels with Integrated Latent Thermal Storage System

2021 ◽  
Author(s):  
◽  
Renārs Millers
Keyword(s):  
Experimental Study ◽  
Literature Review ◽  
Simulation Model ◽  
Storage System ◽  
Thermal Storage ◽  
Simulation Software ◽  
Passive Cooling ◽  
Maximum Deviation ◽  
Experimental Measurements ◽  
Study Results

This Thesis focuses on the development of an experimentally validated equation based simulation model of a cooling panel with integrated latent thermal storage system for utilization in Nearly Zero-Energy Buildings (NZEB) buildings. Development of such model is necessary in order for this technology to achieve industry-readiness. The Thesis is composed of a literature review and an experimental study. The literature review focuses on NZEB requirements in the European Union (EU) member countries, previous research in the field of passive cooling technologies and latent thermal storage systems. The passive cooling technologies described in the literature review are considered potential cooling energy sources to be coupled with the researched cooling panel. A combination of these technologies may be used to address overheating issues in NZEB buildings. The experimental study is focused on the development and validation of the aforementioned cooling panel simulation model. The numerical model is developed by using dynamic simulation software IDA ICE and is composed of sub-models written in Neutral Model Format (NMF). The simulation model is validated against experimental measurements carried out in a test chamber that was developed specially for this study. Moreover, a comparative study is carried out where the results generated by the developed and validated simulation model are compared against a previous CFD simulation study results acquired by a different research team. The accuracy of the results generated by the simulation model when compared with experimental measurements is a maximum deviation of 2.2 °C and a root mean square error of 1.01 °C. The results indicate that the accuracy reached by the simulation model is equal or higher than reported in other similar studies, therefore the accuracy is considered suitable for energy, thermal comfort and cooling load simulation in whole building scale simulation studies. The experimental study also provides several limitations for the proposed simulation model that shall be respected in order to reach the accuracy claimed in this study.

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