磁电机双电容能量叠加点火电路的设计与研究

基于摩托车上广泛采用的磁电机CDI(电容放电式)点火系统,针对现有磁电机CDI点火电路的火花放电持续时间短,电容放电能量低等缺点,结合多电容能量叠加点火系统可以提高点火能量,延长火花放电时间的优点,设计了一种磁电机双电容能量叠加点火电路,并在MATLAB中进行了仿真研究。     

190F汽油机无触点磁控管点火系统

介绍190F汽油机无触点磁控管点火系统（简称MI）的结构特点、工作原理，并与目前广泛使用的无触点电容放电式点火系统（简称CDI）进行比较。     

GJ85型链锯的电容放电式无触点磁电机

本文拟重点介绍“GJ85”电容放电式无触点磁电机充电电路的特点、可控硅的选用、触发线圈和点火线圈的特点等,以期得到有关同志们的指教,共同推动电容放电式无触点磁电机的设计研究工作向前发展。     

双级锂电池-超级电容混合储能的协调控制及功率分配

为平抑直驱式永磁同步风电机组功率波动,文章采用双级锂电池-超级电容混合储能的分层控制策略。首先,通过双向DC/DC变换器控制各储能单元充、放电;其次,将混合储能系统分为协调管理层和功率优化层,协调管理层充分利用锂电池和超级电容优势互补,功率优化层以锂电池荷电状态和最大充、放电功率为约束,建立锂电池功率分配策略及充、放电模式切换;最后,将实测风速数据导入仿真模型,并对比单级锂电池系统的充、放电次数。仿真结果表明,文章所提混合储能系统分层控制策略可很好地实现平滑风电系统出力,且减少了锂电池的充、放电次数,延长锂电池的使用寿命。     

基于MC68HC908单片机的数字点火系统的设计与实现

本文以MC68HC908JK3芯片为核心设计了一种二冲程发动机数字点火系统(DCI),解决了电容放电点火(CDI)系统低速断火和高速失火问题,并且具有降低油耗的功能。     

基于内置差分电容的电缆接头局放检测技术研究

实时准确测量电缆局部放电对电缆运行状态的评估意义重大,目前电缆局部放电主要运用高频互感技术,通过高频电流传感器检测电缆局部放电,但极易受环境噪声干扰,无法准确判断电缆局部放电。本文介绍一种基于差分电容的内置差分容式局放检测技术,该技术可以精确测量电缆局部放电。根据GB/T 7354-2003、IEC 60270:2000标准,通过模拟电缆典型缺陷,对基于差分电容的电缆接头局放检测技术的有效性进行试验验证,试验证明了本技术与实验室局部放电系统的放电相位及响应趋势完全一致,验证了该技术的可靠性和有效性。并将该技术应用于工程实践,极大地提高了电缆局放检测水平。     

基于MC68HC908单片机的数字点火系统的设计与实现

本文以MC68HC908JK3芯片为核心设计了一种二冲程发动机数字点火系统（DCI），解决了电容放电点火（CDI）系统低速断火和高速失火问题，并且具有降低油耗的功能。     

大型煤气机多次放电点火系统

上图为多次放电(CIMD)的 Pulstronic1000简化电路,说明如何经过简单的改接,作为多火花的组件也可以获得单次放电。有 CIMD 线路的 Pulstronic 1000点火系统有一个自备的发电机,被设计成带变压器的完全对称的电容放电点火系统。只要拆去一根连线就可以由多次放电装置 CIMD 变成单次放电点火。为了用最高的效率和最低的能量去获得希望的火花特性,转换为高压火花塞能量的     

点燃式发动机点火能量对火核生成和初期发展的影响

摘要本文研究了点燃式发动机点火能量对火核生成和初期发展的影响.发现增加点火时的击穿能量,可使火核的初始尺寸有效地增加,从而加快火焰的形成和初期发展,并且可以燃烧更为稀薄的混合气,而仅仅增加电容和电感放电阶段的点火能量却没有显著的效果.     

高能点火放电方式对全烧式沼气发动机性能的影响

在全烧式沼气发动机上，对采用两种不同放电方式的高能点火系统进行了实验研究，结果表明：通过延长放电持续期所实现的高能点火，对改善全烧式沼气发动机必的作用不大，而增大放电初期的放电电压和电流可明显是全烧式沼气发动机的性能。     

汽油机点火系故障单片机检测诊断系统

介绍一种利用单片机检测、诊断汽油机点火系故障的分析系统，主要特点是通过检测点火初级线圈在充电、放电时的电流波形，分析诊断出汽油机点火系统故障点部位。同时介绍该系统在分电器在试验台上的实验情况。结果表明，该系统诊断断点系故障快速准确。     

Thermal performance of a two-phase thermosyphon energy storage system

This article presents an energy storage system, which can be readily integrated with the building structure. It stores heat supplied by solar energy via the two-phase closed loop thermosyphon to storage tank and releases stored heat in energy storage material via two-phase closed thermosyphon to the heat exchanger through the flow of transport fluid. The functions of such energy storage system have three operating modes, i.e., heat charge, heat discharge, and simultaneous charge and discharge. The thermal performance of the system with alcohol and water as working fluid is experimentally investigated. The results show that the storage system employing alcohol as working fluid in the loop thermosyphon provides better performance; the system gives optimum heat charge and discharge performance under 35–40% fill ratio, regardless whether the working fluid is water or alcohol. The system displays optimum charge efficiency of 73% and optimum discharge efficiency of 85% with alcohol as working fluid.     

等离子点火系统在燃气轮机上的应用

介绍了等离子点火系统的组成、工作原理和应用效果。等离子点火器与电火花点火器相比，具有放电能量大，耐污垢的优点，特别是点火的同时对燃烧具有强化作用。分析了不同机组对系统的配置要求以及使用中需注意的若干问题。     

Nano-NiOOH prepared by splitting method as super high-speed charge/discharge cathode material for rechargeable alkaline batteries

The present paper introduces a new method to prepare nano-NiOOH by oxidizing and cracking spherical Ni(OH)₂ of nano-structure in NaClO–NaOH solution. The prepared samples were characterized by X-ray powder diffraction (XRD), field emission scan electronic microscope (FESEM) and transmission electron microscopy (TEM). Results indicate that the synthesized sample is nano-NiOOH rod of 60–150 nm in width. The charge/discharge tests show that the nano-NiOOH cathode shows good cycling reversibility at high current density of 10,000 mA g⁻¹, provides a high capacity of 276 mAh g⁻¹ and reduces the charge time to as short as 1.83 min. Furthermore, the nano-NiOOH still keeps a reversible capacity of 93.7% after 120 cycles at a super high charge/discharge current of 10,000 mA g⁻¹, showing a good charge/discharge property.     

Modelling battery charge regulation for a stand-alone photovoltaic system

A new model for the charge and discharge characteristics of a lead–acid battery is presented which aims to model the effect on capacity of variable charge and discharge rates. This model has been implemented using the circuit simulator PSPICE, and is used to investigate the effect of the charge controller strategy on the performance of a stand-alone PV system. It is shown that a simple limit on charging voltage is probably adequate to achieve a high state of charge, although a two-level regulator may be needed to maintain battery condition. The benefits of maximum power point tracking are also investigated.     

Numerical study of the effects of non-equilibrium plasma on the ignition delay of a methane–air mixture using detailed ion chemical kinetics

Researches on non-equilibrium plasmas in ignition and combustion processes have drawn attention of many scientists, because a non-equilibrium plasma-assisted approach provides a useful method to ignite a combustible mixture and stabilize the combustion process. The ignition delay times of methane–air mixtures have been investigated experimentally and numerically; however, the influence of non-equilibrium plasma on the ignition of argon-free methane–air mixtures has seen relatively little discussion. Here, we investigate the ignition delay time of methane–air mixtures via numerical analysis using detailed chemical kinetics. Discharge process and following ignition process are simulated separately, because of significant differences in their time scales and mechanisms. Data on the concentration of atoms and radicals produced in the discharge processes were used as the initial input data to determine the subsequent ignition process because they play an important role in the subsequent ignition process. We focus on the effects of the strength of the reduced electric field, the discharge duration, and the initial temperature on the ignition delay time for zero-dimensional and axisymmetric one-dimensional models. The simulation results showed that the reduced electric field was important in promoting chemical reactions for both the one-dimensional model and the zero-dimensional model; for a constant reduced electric field, longer discharge durations provided more energy to excite the nitrogen, leading to a larger mole fraction of excited nitrogen species during discharge; the gaps between ignition delay times for E/N = 0 and E/N ? 50 Td were very small at high initial temperatures; however they became very large at low initial temperatures.     

Self-ignition of hydrogen releases through electrostatic discharge induced by entrained particulates

The potential for particulates entrained in hydrogen releases to generate electrostatic charge and induce electrostatic discharge ignitions was investigated. A series of tests were performed in which hydrogen was released through a 3.175-mm diameter orifice from an initial pressure of 140 bar. Electrostatic field sensors were used to characterize the electrification of known quantities of iron oxide particulates deliberately entrained in the release. The ignition experiments focused on using charged particulates to induce spark discharges from isolated conductors and corona discharges. A total of 12 ignition events were observed. The results show that electrification of entrained particulates is a viable self-ignition mechanism of hydrogen releases.     

初始进气充量成分对末端气体自燃化学特性的影响

本文介绍了在一台单缸二冲程爆震实验发动机上，研究进气充量中不同的残余气体成分对焰前反应及自燃的影响的实验结果。结果表明，初始进气充量中含有一定量的残余废气时，抑制了自燃；在残余废气中含有一定量的部分氧化产物时，促进了低温化学反应和自燃。低温化学反应所释放的热量以及活性中间产物的积累导致了终燃混合气的自燃。ＲＯＮ５３汽油的自燃过程表现为两阶段着火特征。     

预混合压燃式天然气发动机燃烧性能的初步试验研究

对影响单一燃料天然气发动机压缩着火运转范围和排放特性的相关因素进行了试验研究．设计开发的新型燃烧系统采用球形涡流室式燃烧室配以电控天然气复合供气系统,通过台架试验,研究了不同的天然气供气方式、涡流室结构参数、进气空气加热温度及陶瓷电热塞温度对着火燃烧及排放的影响．试验结果表明,天然气低压进气道供气方式有利于天然气的压缩着火;在一定范围内适当增加涡流室与主室通道尺寸,有利于缓解预混合压燃的敲缸现象;辅助加热温度受到敲缸与部分燃烧现象的制约,应当精确控制．