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Combustion characteristics of a lean-burned CBM engine with hydrogen direction injection 定向喷氢稀燃煤层气发动机的燃烧特性
Pub Date : 2022-12-01 DOI: 10.54097/ije.v1i1.3227
W. Jia
A 3D model of a CBM engine was established, and the combustion modes under different injection parameters and ignition matching conditions were studied by using methane PFI+ hydrogen DI injection method. Flame propagation, flame structure and engine indication thermal efficiency under the three combustion modes were analyzed. The results show that when the interval between injection and ignition is less than 10°CA, the flame structure of plume ignition will be formed; when the interval between injection and ignition is greater than 10°CA and less than 16°CA, the flame form of concentration stratification will be formed; when the interval is greater than 16°CA, the homogeneous flame structure will be formed. The flame propagation speed of plume ignition is significantly higher than that of the other two combustion modes. Under the three combustion modes, the injection and ignition schemes are adjusted several times. When the injection time is -8°CA ATDC and the ignition time is -2°CA ATDC, the flame structure is the plume ignition structure. The indicated thermal efficiency is higher than the other two combustion modes, and the indicated thermal efficiency of the engine is up to 52.8%.
建立了某型煤层气发动机的三维模型,采用甲烷PFI+氢气DI喷射方式,研究了不同喷射参数和点火匹配条件下的燃烧模式。分析了三种燃烧模式下的火焰传播、火焰结构和发动机指示热效率。结果表明:当喷射与点火的间隔小于10°CA时,会形成羽流点火的火焰结构;当喷燃间隔大于10°CA小于16°CA时,会形成浓度分层的火焰形态;当间隔大于16°CA时,将形成均匀的火焰结构。羽流点火的火焰传播速度明显高于其他两种燃烧方式。在三种燃烧模式下,喷射和点火方案进行了多次调整。当喷射时间为-8°CA ATDC,点火时间为-2°CA ATDC时,火焰结构为羽流点火结构。指示热效率高于其他两种燃烧方式,发动机的指示热效率可达52.8%。
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引用次数: 0
Efficient use of solar energy 高效利用太阳能
Pub Date : 2022-12-01 DOI: 10.54097/ije.v1i1.3229
Jingshang Feng
This paper is mainly about the use of solar energy in life to make a summary, and how to improve the utilization of these aspects to make suggestions. Sunlight transmits electricity to the earth all the time. If the total radiation power from sunlight to the earth is converted into power generation power, it can reach 1.77× kW, which is several hundred million times larger than the current global per capita consumption of electricity. There are not only a lot of sunlight, but also all green energy sources from sunlight, such as wind energy, tidal energy, microbial energy, hydraulic energy, etc., all belong to renewable energy sources. As long as there is sunlight, renewable energy sources are as constant as sunlight. In the process of the efficient development and utilization of solar energy, the photovoltaic utilization of nuclear energy has become the fastest progress around the whole world in recent years, the most vitality of the scientific research field.
本文主要是对太阳能在生活中的利用做一个总结,并对如何提高这些方面的利用提出建议。阳光每时每刻都在向地球传递电能。如果将太阳光照射到地球的总辐射功率转换为发电功率,可达1.77× kW,比目前全球人均用电量大几亿倍。不仅有大量的阳光,而且所有来自阳光的绿色能源,如风能、潮汐能、微生物能、水能等,都属于可再生能源。只要有阳光,可再生能源就像阳光一样源源不断。在太阳能高效开发利用的过程中,光伏利用核能已成为近年来全世界进展最快、最具活力的科学研究领域。
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引用次数: 0
The research of the contribution of big data in enhancing power battery safety 大数据对提高动力电池安全性的贡献研究
Pub Date : 2022-12-01 DOI: 10.54097/ije.v1i1.3226
Yufan Wang
The use of oil and gas is the main cause behind the increased impact of severe weather over the past two decades. In the use of oil and natural gas, fuel powered vehicles account for a large part. Therefore, at present, countries are vigorously promoting the settlement of new energy vehicles. With the support of national policies, new energy manufacturers are springing up. There are also many large factories with good qualifications, but there are also many small factories mixed with other factories. With the increase of new energy vehicles, more and more traffic accidents caused by new energy vehicles, especially the self-destruction of new energy vehicles caused by power batteries. Therefore, this paper attempts to make suggestions and analysis on the production, charging, driving and handling of power batteries after accidents through big data monitoring.
石油和天然气的使用是过去二十年来恶劣天气影响增加的主要原因。在石油和天然气的使用中,燃料动力汽车占很大一部分。因此,目前各国都在大力推进新能源汽车落户。在国家政策的支持下,新能源制造企业如雨后春笋般涌现。资质好的大厂也有很多,但也有很多小厂混在一起。随着新能源汽车的增多,新能源汽车引发的交通事故越来越多,尤其是动力电池引发的新能源汽车自毁事故。因此,本文试图通过大数据监控,对事故发生后动力电池的生产、充电、行驶、处理等环节提出建议和分析。
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引用次数: 0
Safety of Lithium Battery for New Energy Vehicles: A Literature Review 新能源汽车锂电池安全性研究综述
Pub Date : 2022-12-01 DOI: 10.54097/ije.v1i1.3228
Congzheng Wu
An overview of the causes of lithium-ion battery fires, what types of extinguishing agents are used when a fire occurs, and how to effectively prevent fires from occurring. It describes in detail the potential factors required for lithium-ion battery fires and related real-world cases, the advantages and disadvantages of various extinguishing agents and whether they can be used in automobiles, and the lithium-ion battery safety systems that have been designed and how they work.
概述锂离子电池火灾的原因,火灾发生时使用的灭火剂类型,以及如何有效防止火灾的发生。它详细描述了锂离子电池火灾所需的潜在因素和相关的现实案例,各种灭火剂的优缺点以及它们是否可以用于汽车,以及已经设计的锂离子电池安全系统及其工作原理。
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引用次数: 0
Research on new energy Marketing innovation 新能源营销创新研究
Pub Date : 2022-11-01 DOI: 10.54097/ije.v1i1.2021
Qingfang Guo, Yuan Xia, Xinyue Zhang, Ziheng Wang
On September 22, 2021, the Party Central Committee, with General Secretary Xi as the core, made a major decision to achieve carbon peaking and carbon neutrality, with the following main objectives. By 2025, an economic system of green, low-carbon and cyclic development will take initial shape, laying a solid foundation for achieving carbon peaking and carbon neutrality. By 2030, the comprehensive green transformation of economic and social development has achieved significant results, and the energy utilization efficiency of key energy-consuming industries has reached the international advanced level. By 2060, a green low-carbon cycle development of the economic system and a clean, low-carbon, safe and efficient energy system will be fully established, carbon neutral goals will be successfully achieved, fruitful results will be achieved in the construction of ecological civilization, and a new realm of harmonious coexistence between man and nature will be created. In order to achieve the goal, "on the complete and accurate implementation of the new development concept to do a good job of carbon peak carbon neutral views" clearly mentioned, accelerate the construction of low-carbon transportation system, the promotion of energy-saving low-carbon transport, this advocacy brings opportunities for the development of new energy vehicles, new energy vehicles refers to is the use of non-conventional automotive fuel as a power source, integrated vehicle power control and drive aspects of the Advanced technology, formed with new technology, new structure, advanced technical principles of the vehicle. However, under the role of the market and external environment, although the sales of new energy vehicles are developing in an upward trend, a series of problems exist in them leading to a bottleneck to be broken through. This paper provides an in-depth analysis of this phenomenon and provides innovative points for the development of the new energy vehicle industry from the marketing perspective to promote the development of the new energy vehicle industry.
到2025年,绿色低碳、循环发展的经济体系初步形成,为实现碳调峰和碳中和奠定坚实基础。到2030年,经济社会发展全面绿色转型取得显著成效,重点耗能行业能源利用效率达到国际先进水平。到2060年,全面建立绿色低碳循环发展的经济体系和清洁低碳安全高效的能源体系,顺利实现碳中和目标,生态文明建设取得丰硕成果,创造人与自然和谐相处的新境界。为实现目标,《关于全面准确贯彻落实新发展理念做好碳峰碳中和意见》明确提到,加快建设低碳交通运输体系,推广节能低碳交通运输,这种倡导为新能源汽车的发展带来机遇,新能源汽车指的是使用非常规汽车燃料作为动力源,集成了整车动力控制和驱动方面的先进技术,形成了具有新工艺、新结构、先进技术原理的整车。然而,在市场和外部环境的作用下,新能源汽车的销售虽然呈上升趋势发展,但也存在一系列问题,瓶颈有待突破。本文对这一现象进行了深入的分析,并从营销的角度为新能源汽车产业的发展提供了创新点,以促进新能源汽车产业的发展。
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引用次数: 2
Five-level DTC-ANN with Balancing Strategy of DSIM 基于DSIM平衡策略的5级DTC-ANN
Pub Date : 2022-05-17 DOI: 10.46300/91010.2022.16.8
E. Benyoussef, S. Barkat
This paper presents an artificial neural networks controller devoted to improve the performance of direct torque control strategy of double star induction machine fed by two five-level diode-clamped inverters. The resulting control scheme presents enough degrees of freedom to control both torque and flux with very low ripple and high dynamics. Unfortunately, the diode-clamped inverter has an inherent problem of DC-link capacitors voltages variations. To overcome this problem, an artificial neural network based direct torque control with balancing strategy is proposed to suppress the unbalance of DC-link capacitor voltages. Simulations results are given to show the effectiveness and the robustness of the suggested control method.
本文提出了一种人工神经网络控制器,用于改善由两个五电平二极管箝位逆变器供电的双星感应电机直接转矩控制策略的性能。所得到的控制方案具有足够的自由度来控制转矩和磁链,具有非常低的纹波和高动态。不幸的是,二极管箝位逆变器具有直流电容电压变化的固有问题。为了克服这一问题,提出了一种基于人工神经网络的直接转矩控制与平衡策略,以抑制直流链路电容电压的不平衡。仿真结果表明了所提控制方法的有效性和鲁棒性。
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引用次数: 1
Analysing the Impact of the Monetary Policy Dynamics on Financial Imbalances- A Model Approach 分析货币政策动态对金融失衡的影响——一个模型方法
Pub Date : 2022-03-09 DOI: 10.46300/91010.2022.16.2
Wael Bakhit
This paper employs a quarterly time series to determine the timing of structural breaks for interest rates in USA over the last 60 years. The Chow test is used for investigating the non-stationary, where the date of the potential break is assumed to be known. Moreover, an empirically examination of the financial sector to check if it is positively related to deviations from an assumed interest rate as given in a standard Taylor rule. The empirical analysis is strengthened by analysing the rule from a historical perspective and look at the effect of setting the interest rate by the central bank on financial imbalances. The empirical evidence indicates that deviation in monetary policy has a potential causal factor in the build up of financial imbalances and the subsequent crisis where macro prudential intervention could have beneficial effect. Thus, my findings tend to support the view which states that the probable existence of central banks has been one source of global financial crisis since the past decade.
本文采用季度时间序列来确定近60年来美国利率结构断裂的时间。Chow检验用于调查非平稳性,其中假定潜在断裂的日期是已知的。此外,对金融部门进行实证检查,以检查它是否与标准泰勒规则中给定的假设利率偏差呈正相关。通过从历史角度分析这一规律,并考察央行设定利率对金融失衡的影响,加强了实证分析。实证证据表明,货币政策偏差在金融失衡的积累和随后的危机中具有潜在的因果因素,宏观审慎干预可能会产生有益的影响。因此,我的研究结果倾向于支持这样一种观点,即央行的可能存在是过去十年来全球金融危机的一个根源。
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引用次数: 0
Multiscale Convergence Optimization in Constrained Molecular Dynamics Simulations 约束分子动力学模拟中的多尺度收敛优化
Pub Date : 2022-03-09 DOI: 10.46300/91010.2022.16.7
N. Nafati, S. Antonczak, J. Topin, J. Gołȩbiowski
The energy analysis is essential for studying chemical or biochemical reactions but also for characterizing interactions between two protagonists. Molecular Dynamics Simulations are well suited to sampling interaction structures but under minimum energy. To sample unstable or high energy structures, it is necessary to apply a bias-constraint in the simulation, in order to maintain the system in a stable energy state. In MD constrained simulations of ""Umbrella Sampling"" type, the phenomenon of ligand-receptor dissociation is divided into a series of windows (space sampling) in which the simulation time is fixed in advance. A step of de-biasing and statistical processing then allows accessing to the Potential Force Medium (PMF) of the studied process. In this context, we have developed an algorithm that optimizes the DM computation time regarding each reaction coordinate (distance between the ligand and the receptor); and thus can dynamically adjust the sampling time in each US-Window. The data processing consists in studying the convergence of the distributions of the coordinate constraint and its performance is tested on different ligand-receptor systems. Its originality lies in the used processing technique which combines wavelet thresholding with statistical-tests decision in relation to distribution convergence. In this paper, we briefly describe a Molecular Dynamic Simulation, then by assumption we consider that distribution data are series of random-variables vectors obeying to a normal probality law. These vectors are first analyzed by a wavelet technique, thresholded and in a second step, their law probability is computed for comparison in terms of convergence. In this context, we give the result of PMF and computation time according to statistic-tests convergence criteria, such as Kolmogorov Smirnov, Student tTest, and ANOVA Tests. We also compare these results with those obtained after a preprocessing with Gaussian low-pass filtering in order to follow the influence of thresholding. Finally, the results are discussed and analyzed regarding the contribution of the muli-scale processing and the more suited criteria for time optimization.
能量分析对于研究化学或生化反应是必不可少的,而且对于描述两个主角之间的相互作用也是必不可少的。分子动力学模拟非常适合于在最小能量条件下对相互作用结构进行采样。为了对不稳定或高能量结构进行采样,有必要在模拟中应用偏置约束,以保持系统处于稳定的能量状态。在“伞形采样”型MD约束模拟中,将配体-受体解离现象划分为一系列窗口(空间采样),在这些窗口中模拟时间是预先固定的。一个去偏和统计处理的步骤,然后允许访问研究过程的势力介质(PMF)。在这种情况下,我们开发了一种算法,可以优化每个反应坐标(配体和受体之间的距离)的DM计算时间;从而可以动态调整每个US-Window的采样时间。数据处理包括研究坐标约束分布的收敛性,并在不同的配体-受体体系上测试其性能。其独创性在于将小波阈值与分布收敛性的统计检验决策相结合的处理技术。本文简要地描述了分子动力学模拟,然后假定分布数据是服从正态概率律的随机变量向量序列。首先用小波技术对这些向量进行阈值分析,第二步,计算它们的律概率,以比较收敛性。在这种情况下,我们根据统计检验的收敛准则,如Kolmogorov Smirnov, Student tTest和ANOVA检验,给出PMF的结果和计算时间。为了跟踪阈值的影响,我们还将这些结果与高斯低通滤波预处理后得到的结果进行了比较。最后,就多尺度处理的贡献和更适合的时间优化准则进行了讨论和分析。
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引用次数: 0
The Issues of the Improvement of the Methodology for the Assessment of Reforms 改革评估方法改进的若干问题
Pub Date : 2022-03-09 DOI: 10.46300/91010.2022.16.4
Samson Davoyan, A. Davoyan
The purpose of this article is to suggest a new methodology that will give us an opportunity to create an Integral Index of Reforms (IIR) that will include seven indexes: KOF Index of Globalization, The Democracy Index, The Corruption Perception, The Human Development, Doing Business, The Global Competitiveness Index and The Index of Economic Freedom. From both scientific and empiric perspective it is supposed that the quantitive assessment of various reforms implemented in different countries based on presented indicators of seven indexes despite the new methodology that we suggest give us the opportunity to include much more indexes.
本文的目的是提出一种新的方法,使我们有机会创建一个综合改革指数(IIR),该指数将包括七个指数:KOF全球化指数、民主指数、腐败感知、人类发展、营商环境、全球竞争力指数和经济自由指数。从科学和经验的角度来看,尽管我们建议采用新的方法,但假设基于七个指数的现有指标对不同国家实施的各种改革进行定量评估,使我们有机会包括更多的指数。
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引用次数: 0
Simulating System for Technical Characteristic Analysis in Power Generation by Wind Turbine Generator 风力发电技术特性分析仿真系统
Pub Date : 2022-03-09 DOI: 10.46300/91010.2022.16.1
W. Srisongkram, N. Phanthuna
This paper describes the design of the controlling and monitoring system for electricity quality from wind turbine. The 4-RMUT (Rajamangala University of Technology) network joined in this research in order to apply for educational learning as well. This research proposes two objectives as follows: firstly, inventing the prototype of wind turbine for generating electricity including analyses to increase and monitor its efficiency; finally, demonstrating the prototype with our students in order to increase more understanding in a class than ever. The conclusion and developing of this research were also transferred the technical knowledge to the electrical engineering student by discussion in the class. Furthermore, the technical discussion in the class was also improved the teaching efficiency and given more vision to the engineering student as well.
本文介绍了风力发电机组电能质量监控系统的设计。4-RMUT (Rajamangala University of Technology)网络也加入了这项研究,以便应用于教育学习。本研究提出两个目标:第一,发明用于发电的风力发电机原型,包括分析如何提高和监测其效率;最后,与我们的学生一起演示原型,以便在课堂上比以往任何时候都更多地理解。本研究的结论与发展,也透过课堂讨论的方式,将技术知识传递给电气工程系的学生。此外,课堂上的技术讨论也提高了教学效率,并为工科学生提供了更多的视野。
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引用次数: 0
期刊
International journal of energy science
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