中速大功率长冲程单缸柴油机平衡装置设计

详细介绍了某中速大功率长冲程单缸柴油机平衡装置中的平衡轮系平衡块、曲轴平衡重、飞轮的设计方法;通过AVL Excite Designer软件仿真软件,对单缸机的往复惯性力、离心惯性力的平衡状态进行了分析,并对单缸机回转不均匀度进行了计算校核.分析表明:所设计的平衡装置满足设计要求.     

单缸柴油机曲轴油封漏油问题的初探

单缸柴油机曲轴油封漏油是当前许多制造厂觉得比较棘手的问题,它直接影响柴油机的整机可靠性。本文对这个问题进行分析,探讨漏油的原因及改进办法。 1漏油原因分析曲轴油封漏油原因一般有四个方面: a.曲轴箱内压太高; b.机油压力太高; c.油封装配时压斜使唇口卷曲; d.油封本身质量不佳,如老化,唇口弹簧力失效。以上四方面可分别通过安装负压器,机     

单缸小型柴油机锻钢曲轴断裂原因分析及防治措施

分析单缸小型柴油机在用户使用过程中发生锻钢曲轴断裂的原因，介绍在柴油机实际生产过程中已采取并初见成效的几种防止曲轴断裂的措施，并提出了尚在研究之中的几种防止曲轴断裂的办法。     

小缸径柴油机迷宫式呼吸器

柴油机曲轴箱通风的好坏不仅直接影响其机油耗,而且与柴油机的性能、零件寿命等都有直接关系,所以必须及时排除曲轴箱内积存的高温废气,使曲轴箱保持一定的负压或零压. 笔者通过分析单缸机和多缸机工作过程的特点,以及解决480柴油机呼吸器通气管滴机油的实践,总结出设计柴油机曲轴箱通风呼吸器3个要点;     

曲轴连杆颈表面淬火

曲轴连杆颈表面淬火湖南滨湖柴油机总厂刘玉清单缸小型柴油机由于工作平稳性较差，因此曲轴一般都采用中碳钢模锻成型并进行整体调质。为增强耐磨性提高工作寿命和抗疲劳强度，绝大多数曲轴都是对连杆颈进行表面感应淬火。事实上，由于曲柄与连杆颈所构成的半封闭形状，使...     

单缸柴油机曲轴优化设计

在一台单缸柴油试验机的曲轴优化设计过程中,对曲轴的设计要点进行了阐述,并通过软件,AVL Excite Designer对单缸机的回转不均匀度和曲轴强度进行了计算校核。     

提高S185型柴油机平衡性能的探讨

单缸小型柴油机扩缸变型后，通常是因活塞组质量增加而导致往复惯性力增大、不平衡性增大。本文通过对Ｓ１８５型柴油机平衡机构的分析和试验，探讨了加重上下平衡轴要比加重曲轴平衡块对改善其平衡性能更有效。     

用列表计算法快速确定四冲程柴油机各缸相位角

<正> 1 前言柴油机各缸相位角的检查阳调整,无论是在柴油机总装、性能调试以及大修过程中是必然遇到的一项工作。本文所介绍的是应用一种简易的列表计算法确定各缸相位角所对应的曲轴转角值,用来作为检查和调整的依据。本方法的主要特点是:     

某型柴油机曲轴三维接触有限元分析

本文以力学和有限元理论为基础,以某型单缸柴油机曲轴为研究对象,利用大型CAD/CAE软件PRO/E和ANSYS,进行曲轴整体三维接触有限元计算。通过计算得出曲轴所受的应力值,找出危险截面即应力最大区域,并对该曲轴的设计及改进提出合理的建议。     

小型单缸柴油机飞轮锥孔加工方法的分析

小型单缸柴油机飞轮锥孔加工方法的分析湖南滨湖柴油机总厂刘玉清在我国小型单缸风冷柴油机中，飞轮与曲轴的联接是以锥面配合来实现动力传递的。由于在飞轮上都装有冷却风扇，飞轮的内外侧又分别装有导风底板和导风罩、引风圈等风冷系统构件，见图１，从整机设计的角度考...     

小型锅炉烟尘测试时锅炉出力的计算

锅炉烟尘测试时,必须对锅炉出力进行测试。但监测中,许多小型锅炉往往不具备相关的计量装置和仪表,为解决这一问题,文章提出了用烟气量和空气过剩系数来计算锅炉的出力的公式,在实际使用中,该方法简单易行,其结果和实测值具有很好的一致怀。     

Unerroric of control of mutual compliance of the efficiency of hydrogen engines of unmanned vehicles in the conditions of mass production

The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO₂ and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized.     

中国煤炭地下气化技术的发展

本文综述了煤炭地下汽化技术的国内外发展现状,对我国“长通道、大断面”煤炭地下气化新工艺给予了技术经济评述,并提出了发展煤炭地下汽化技术的政策建议。     

Review of theory of distortion and disintegration of liquid streams

Linear and nonlinear analyses of the instabilities and distortion of liquid streams injected into a gaseous media are discussed. The various fundamental mechanisms and the predictive capabilities for the distortions are emphasized. Round jets, planar sheets, annular sheets, and conical sheets are discussed in detail. The balance between capillary and inertial forces is primarily examined. The method for simplifying the analyses in the case of thin liquid sheets is discussed. The capabilities for representing the droplet size distribution that follows the stream disintegration are outlined.     

MgO膨胀剂细度对MgO水化和水泥浆体膨胀的影响

基于《水工混凝土掺用氧化镁技术规范》中的Ⅰ型氧化镁（MgO）,研究了该型MgO膨胀剂（MEA）细度对掺粉煤灰水泥浆体膨胀性能的影响。即采用X射线衍射分析(XRD)及同步热分析（TG DSC）分析了掺MEA水泥浆体中MgO的水化性。结果表明,养护温度相同时,MEA的细度对水泥浆体内MEA中MgO的水化和水泥浆体的膨胀无显著影响,产生的膨胀均能补偿水泥浆体的收缩;MEA的细度可从试验设计采用的45 μm筛筛余15%左右增加到30%左右,这将有利于MEA生产企业的节能降耗。     

机车车轮多轴疲劳强度安全评定的研究

使用ANSYS8.0软件对高速列车车轮进行了三维有限元分析,计算出车轮在直线、曲线和道岔条件下牵引、制动共6种工况时孔边薄弱部位的应力,分别通过Mises等效平均应力方法、Sines平均主应力方法和应力分量中考虑平均应力方法计算出应力在极值位置时的等效应力幅、等效平均应力,从而进一步算出车轮的安全系数,对其疲劳强度进行评定,并对3种方法进行了比较研究。     

Constructal optimization of the geometry of an array of micro-channels

This paper documents the geometric optimization of an array of circular and non-circular ducts. The optimization was carried out numerically using finite volume method. As optimal dimensions were independent of the array configuration, the numerical simulation was performed on a unit cell. Numerical optimization for circular, square and isosceles right triangle cross-sections of channels was performed. Based on the results of this investigation, some correlations were proposed to predict the optimal hydraulic diameter and dimensionless heat transfer per unit volume. In addition to examining the effect of pressure drop on these parameters, it was showed that among the different geometries of this study, square cross-section has the most efficiency for a given volume. The numerical results of the present study were compared with approximate results reported in the literature which a good agreement was observed.     

固体热辐射Yong性能分析

本文对漫灰均温物体在常物性条件下对外辐射传热的Ｙｏｎｇ值计算建立了数学模型。通过与物体内能Ｙｏｎｇ公式的数值计算比较,得出了辐射能量的Ｙｏｎｇ值不大于内能Ｙｏｎｇ值的结论。从初步的热射Ｙｏｎｇ值计算公式发现。Ｙｏｎｇ与物体表面辐射率有关。     

Measurements of concentration distribution of hydrogen jet using deflection of center of the laser spot

The main purpose of this work is to propose a new method to evaluate the concentration distribution of the hydrogen jet by using a He–Ne laser through the jet. This research attempts to apply the expression of concentration Gaussian distribution, the refraction formula of inhomogeneous refractive index medium, and the concentration inversion function to disclose the displacement of the center of the laser spot at different heights in the gas jet. The spot images of the laser beam passing through the gas jet at three vertical heights z = 10d, 20d, 30d, and different radial positions are obtained. The radial spatial asymmetry of the gas jet is also found in the experiment. Finally, the calculated concentration distribution curve and the fluent simulation curve, it is found that the two results are very similar. Our findings show that the error between the concentration distribution of this method and the simulated concentration distribution reaches 2.43%.     

Heat of vaporization of mixtures

General expressions for the heat of vaporization of mixtures at constant pressure; at constant temperature; and at constant pressure, temperature, and composition are proposed. The last one is related to the liquid-vapor interface where steady vaporization or condensation is taking place. Numerical examples by the proposed expressions are shown for binary mixtures of HCFC22(R22) and (HCFC123(R123) © 1997 Scripta Technica, Inc. Heat Trans Jpn Res, 25(1): 12–24, 1996