汽车发动机多参量测试系统

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北京欧兰科技发展有限公司

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综合汽车及零部件其他机械设备石油/化工交通

重型预混合压缩点火（PCCI）发动机中曲轴角分辨流场表征检测方案(粒子图像测速)
To achieve PCCI combustionwith limited heat release rates, the influence of charge stratification on combustion should be investigated. In this paper a method is presented to achieve and measure charge stratification. As a first attempt to investigate the mixing, we measure the in-cylinder velocities using particle image velocimetry (PIV). From these velocities the turbulence intensities are derived, which give an indication of the mixing of charge. First results indicate that the turbulence is homogeneous and that the swirl center shifts towards the center of the combustion chamber. Future measurements will also entail time resolved PIV measurements.
交通 2012-01-27
真实发动机,缸内流动结构,发动机中流场,速度场检测方案(粒子图像测速)
In-cylinder PIV measurements have been made during the latter half of the intake stroke on a plane between the inlet valves for a single cylinder optical engine operating at engine speeds of 750, 2000 and 3500 rpm. Mean vector fields for an area of 42 mm by 34 mm have been produced with vectors at approximately 1 mm resolution. The vector fields show the development of the flow field in 1.6°, 2.4° and 3.2° steps for the three respective engine speeds. Tumble ratios have been calculated from these vector fields which show that a change in the flow regime occurs between 2000 and 3500 rpm. This is caused by one of rotating vortices becoming detached from the descending piston at the highest engine speed.
汽车及零部件 2011-05-08
单缸,发动机,进气歧管,倾角,进气门中流动特性,速度场,速度矢量场检测方案(粒子图像测速)
Abstract—In-cylinder flow field structure in an internal combustion (I.C) engine has a major influence on the combustion, emission and performance characteristics. Fluid enters the combustion chamber of an I.C engine through the intake manifold with high velocity. Then the kinetic energy of the fluid resulting in turbulence causes rapid mixing of fuel and air, if the fuel is injected directly into the cylinder. With optimal turbulence, better mixing of fuel and air is possible which leads to effective combustion. A good knowledge of the flow field inside the cylinder of an I.C engine is very much essential for optimization of the design of the combustion chamber for better performance especially in modern I.C engines like gasoline direct injection (GDI), homogeneous charge compression ignition (HCCI) engines.The main objective of this work is to study the incylinder fluid flow field characteristics of a single-cylinder engine to see the effect of intake manifold inclination at equivalent rated engine speed using Particle Image Velocimetry (PIV) under various static intake valve lift conditions. To facilitate the PIV experiments, the metal cylinder of the engine was replaced by a transparent one. For every operating test condition, 50 image pairs were captured and processed using DAVIS software. From the results, it is seen that the in-cylinder flow structure is greatly influenced by the intake manifold inclinations irrespective of intake valve lift. Maximum Turbulent Kinetic Energy (TKE) was highest at full intake valve lift irrespective of the inclination. Also, the maximum TKE was the highest for 600 intake manifold inclination compared to other inclinations irrespective of the intake valve lift at equivalent rated engine speed. Finally, it is concluding that the analysis carried in this work is useful in predicting the flow and inturn optimizing combustion chamber of modern I.C engines.
其他 2011-03-10
柴油燃料喷雾中碳烟体积分数,碳烟初级粒径检测方案(尾气检测)
Laser-induced incandescence can be applied to raw exhaust at the open tailpipe, or along the exhaust train using either an in situ optical cell or by extractive sam-pling to an external cell. While in situ measurements are preferable to avoid artifacts caused by extractive sam-pling, the experimental setup may be complex and thus more expensive to implement. In this paper we make a direct comparison of time-resolved in situ versus ex-tracted-sample measurements for rapid engine tran-sients of load and speed. In addition, we compare meas-urements for exhaust extracted from three different loca-tions: 1) at the turbocharger output; 2) at the muffler entrance; 3) at the muffler exit. The results show that extractive sampling sufficiently replicates in situ meas-urements obtained at the muffler entrance, and that rapid transients in soot concentration vary to a small but detectable degree with the measurement location.
石油/化工 2009-12-27

柴油JP-8喷嘴中燃料注入喷嘴结构对JP-8喷雾性能的影响检测方案(激光粒度仪)
采用LaVision公司的高速相机和多参量数据采集和分析处理软件平台DaVis，对柴油JP-8喷雾的性能进行了测量分析。获得了喷雾的米氏散射和纹影成像数据。
汽车及零部件 2018-01-25
火花塞中点火过程中燃烧可变性检测方案(粒子图像测速)
采用LaVision公司特色的以DaVis软件平台为基础构成汽车发动机时间分辨多参两成像测试系统，研究了确定火花辅助压缩点火过程中燃烧可变性原因所需要的实验度量指标。
汽车及零部件 2017-09-14
直接喷射火花塞引燃（DISI）引擎进气道中流动不稳定性检测方案(粒子图像测速)
采用LaVision公司特色的以DaVis软件平台为基础构成的粒子成像测速（PIV）系统对直接喷射火花塞引燃（DISI）引擎进气道产生的流动不稳定性进行了测试和研究。
汽车及零部件 2017-09-14
喷雾导引火花塞引燃直接喷射发动机（SGSIDI）中高速成像诊断检测方案(粒子图像测速)
采用LaVision公司特色的以DaVis软件平台和高速相机为基础构成的喷雾高速成像诊断测量系统（SprayMaster）对喷雾导引火花塞引燃直接喷射发动机（SGSIDI）内部燃料混合，注入等过程进行了测试和研究。
汽车及零部件 2017-09-14

喷嘴中直径对火焰举升长度的影响检测方案(尾气检测)
采用LaVision公司的增强型CCD相机对火焰喷射对象进行了测量。研究了喷嘴直径对火焰举升长度的影响。
其他 2017-09-08
流体中PLIF,平面激光诱导荧光,浓度场,速度场检测方案(流量计)
A concept for dynamic mixture formation investigations of fuel/air mixtures is presented which can equally be applied to several other laser induced fluorescence (LIF) applications. Double-pulse LIF imaging was used to gain insight into dynamic mixture formation processes. The setup consists of a modified standard PIV setup. The ‘‘fuel/air ratio measurement by laser induced fluorescence (FARLIF)’’ approach is used for a quantification of the LIF images in order to obtain pairs of 2D fuel/air ratio maps. Two different evaluation concepts for LIF double pulse images are discussed. The first is based on the calculation of the temporal derivative field of the fuel/air ratio distribution. The result gives insight into the dynamic mixing process, showing where and how the mixture is changing locally. The second concept uses optical flow methods in order to estimate the motion of fluorescence (i.e., mixture) structures to gain insight into the dynamics, showing the distortion and the motion of the inhomogeneous mixture field.
其他 2012-08-22
发动机中流场,速度场检测方案(粒子图像测速)
1.The HARVEST Project 2.2D-2C PIV Measurements 3.NumericalComputation 4.Results 1.ComparisonsPIV / CFD 2.Characterizationof dynamicstall 5.Conclusions ---------------------------------------------------------- Objective:Convertcineticenergyof riversor of tidal flow Specificity:Vertical axis turbine, radial flux, new generationof Darrieusand Gorlovturbine
其他 2012-07-19
流体中评价比较分析手段的方法检测方案(粒子图像测速)
In this report we present the methodology we are using in the AMI group to compare optic flow estimation methods in the context of the FLUID Specific Targeted Research Project - Contract No 513633 founded by the CEE. The main goal of this report is to try to unify comparison criteria between the different parnerts in order to share information and conclusions. We think that it is one of the topics we have to address in Las Palmas Meeting December next. In order to describe the methodology we use, we divide it in five steps: 1. We choose a number of optic flow estimation methods 2. We choose an image sequence dataset to apply the methods. 3. We apply the methods and we store the results in a ASCII file using an standard format 4. We define a number of statistics to compare the methods (we use the ASCII files as basic information to compare). 5. We compute the statistics for each pair of methods and we generate tables with the information. To help result interpretation we use arrow images and in the case we know the optic flow groundtruth we generate image to provide the information about what method perform better in the different areas of the image. To illustrate this approach and to fit ideas we present the results of this approach in a particular image sequence provided by LaVision in sections from 1.1 to 1.4. Then, in section 2 we remark some of the difficulties we have found in our work, which should be discussed in order to be able to compare results provided by all the partners of the FLUID project.
其他 2012-07-01

内燃机缸内的滚流中滚流粒子成像检测方案(粒子图像测速)
Now-a-days, the stratified and direct injection spark ignition engines are becoming very popular because of their low fuel consumption and exhaust emissions. But, the challenges to them are the formation and control of the charge which is mainly dependent on the in-cylinder fluid flows. Today, an optical tool like particle image velocimetry (PIV) is extensively used for the in-cylinder fluid flow measurements. This paper deals with the experimental investigations of the in-cylinder fluid tumble flows in a motored internal combustion engine with a flat piston at different engine speeds during intake and compression strokes using PIV. The two-dimensional in-cylinder flow measurements and analysis of tumble flows have been carried out in the combustion space on a vertical plane at the cylinder axis. To analyze the fluid flows, ensemble average velocity vectors have been used. To characterize the tumble flow, tumble ratio has been estimated. From the results, it is found that the tumble ratio mainly varies with crank angle positions. At the end of compression stroke, maximum turbulent kinetic energy is more at higher engine speeds. Present study will be very useful in understanding the effect of engine speeds on the in-cylinder fluid tumble flows under real engine conditions.
机械设备 2012-08-22
发动机中缸内傅里叶变换红外光谱学检测方案(尾气检测)
We have adapted a standard Fourier-transform infrared (FTIR) spectrometer (Thermo-Scientific Nexus 670) for in-cylinder measurements of gas spectra. During engine operation, the engine shaft encoder signal is logged continuously along with the FTIR’s He–Ne laser signal and infrared interferogram signal. The engine piston and FTIR mirror move in an uncorrelated fashion, so that after many minutes of engine operation, a complete interferogram is populated at each piston position. Afterward, the data are compiled into a series of spectra versus crank-angle degree. Here, we present a near-infrared H2O thermal emission spectrum measured through a fiber-optic spark plug connected to an engine
机械设备 2012-01-27

柴油燃料喷雾中碳烟体积分数,碳烟初级粒径检测方案(尾气检测)
Laser-induced incandescence can be applied to raw exhaust at the open tailpipe, or along the exhaust train using either an in situ optical cell or by extractive sam-pling to an external cell. While in situ measurements are preferable to avoid artifacts caused by extractive sam-pling, the experimental setup may be complex and thus more expensive to implement. In this paper we make a direct comparison of time-resolved in situ versus ex-tracted-sample measurements for rapid engine tran-sients of load and speed. In addition, we compare meas-urements for exhaust extracted from three different loca-tions: 1) at the turbocharger output; 2) at the muffler entrance; 3) at the muffler exit. The results show that extractive sampling sufficiently replicates in situ meas-urements obtained at the muffler entrance, and that rapid transients in soot concentration vary to a small but detectable degree with the measurement location.
石油/化工 2009-12-27
碳烟中体积分数,初级粒径检测方案(烟气分析仪)
• Motivation – Support increased technical productivity by developing process technology to more effectively and efficiently estimate concentrations of particulate matter (PM) in Diesel engine exhaust – This will enable the further development of emissions compliant engine products • Develop efficient and effective soot management and dosing strategy for DPF’s (diesel particulate filters) • Develop effective engine calibrations for reducing PM levels at different engine conditions • Facilitate further development of emissions compliant engine products
石油/化工 2009-12-27

直喷发动机中涡旋对空燃混合过程的影响检测方案(尾气检测)
The effect on fuel consumption and emissions of switching from two-valve to single-valve EIVC operation in order to generate swirl intake structures in a four-valve, pent-roof gasoline direct injection (GDI) engine has been investigated. Mie imaging of the fuel spray propagation, along with PIV measurements of the intake flow field have been taken in an optical engine, and fuel economy and emissions measurements have been made on a thermodynamic engine with identical geometry and ancillary systems. The measurements show that fuel economy can be improved substantially when EIVC valve operation is employed, and results differ when only a single inlet valve is activated. Bulk swirl structures are generated in the engine cylinder which affect the atomisation and transportation of the fuel spray and engine performance. For fuel injection after the inlet valve closing point, the reduction in shear forces and mixing from the intake air structures is sufficient to cause engine misfires.
交通 2012-02-28
重型预混合压缩点火（PCCI）发动机中曲轴角分辨流场表征检测方案(粒子图像测速)
To achieve PCCI combustionwith limited heat release rates, the influence of charge stratification on combustion should be investigated. In this paper a method is presented to achieve and measure charge stratification. As a first attempt to investigate the mixing, we measure the in-cylinder velocities using particle image velocimetry (PIV). From these velocities the turbulence intensities are derived, which give an indication of the mixing of charge. First results indicate that the turbulence is homogeneous and that the swirl center shifts towards the center of the combustion chamber. Future measurements will also entail time resolved PIV measurements.
交通 2012-01-27