Laser Doppler Anemometer Measurements in an Internal Combustion Engine

Rask, Rodney B.

doi:10.4271/790094

Cited by 83 publications

(7 citation statements)

References 13 publications

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“…Laser Doppler Velocimetry (LDV) has been previously applied to obtain single and two-point measurements in premixed internal combustion engines [4,5]. The development of PIV as a robust optical diagnostic technique allows the recording of instantaneous, two-dimensional, velocity field data from which relevant flow field quantities (e.g.…”

Section: Particle Image Velocimetrymentioning

confidence: 99%

PIV, high-speed PLIF and chemiluminescence imaging for near-spark-plug investigations in IC engines

Fajardo

Smith

Sick

2006

J. Phys.: Conf. Ser.

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Measurements of the local flow and mixture condition near the spark plug of internal combustion engines are important to characterize their influence on ignition and combustion performance. This is especially true for direct-injection engines where limited time is available for mixture formation and optimum stratification of the fuel/air mixture to achieve best performance. Transient processes need to be visualized in an optically challenging environment. The application of digital Particle Image Velocimetry (PIV) for flow field measurements along with crank angle-resolved planar laser induced fluorescence (PLIF) and chemiluminescence imaging is discussed in the context of investigations of a highly stratified sprayguided direct-injection engine. Flow fields were captured in a firing optical single-cylinder engine to study the interaction of the fast spray and the underlying in-cylinder tumble flow. The impingement of the fuel spray on the spark plug electrodes and subsequent dispersion of the fuel cloud was filmed at a rate of 12kHz with a new PLIF technique using a diode-pumped Nd:YAG laser. Subsequent flame development and combustion progress could be followed via high-speed imaging of OH * chemiluminescence. This approach was also combined with double-pulse PLIF imaging of fuel distributions.

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Section: Particle Image Velocimetrymentioning

confidence: 99%

PIV, high-speed PLIF and chemiluminescence imaging for near-spark-plug investigations in IC engines

Fajardo

Smith

Sick

2006

J. Phys.: Conf. Ser.

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“…Combustion quality depends on the turbulent mixing of fuel and air; turbulence defines the flame speed, burning temperature and the emission of pollutants from combustion processes. Much research has been undertaken to study the in-cylinder flow fields using many different experimental techniques [2], including hotwire anemometry [3], particle tracking velocimetry (PTV) [4][5][6][7], particle image velocimetry (PIV) [7][8][9] and LDV [10][11][12][13][14][15][16][17][18]. Among these techniques, LDV has been widely used since LDV can be easily adapted to study flow fields within hard to reach geometries such as the valve exit flow or, the flow inside complex bowl-piston configurations [19].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Velocity Decomposition Methods for Internal Combustion Engines

Ölçmen

Ashford²,

Schinestsky³

et al. 2012

OJFD

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Different signal processing technique performances are compared to each other with regard to separating the mean and fluctuating velocity components of a simulated one-dimensional unsteady velocity signal comparable to signals observed in internal combustion engines. A simulation signal with known mean and fluctuating components was generated using experimental data and generic turbulence spectral information. The simulation signal was generated based on observations on the measured velocity data obtained using LDV in a motored Briggs-and-Stratton engine at about 600 RPM. Experimental data was used as a guide to shape the simulated signal mean velocity variation; fluctuating velocity variations with specified spectrum and standard deviation was used to mimic the turbulence. Cyclic variations were added both to the mean and the fluctuating velocity signals to simulate prescribed cyclic variations. The simulated signal was introduced as input to the following algorithms: ensemble averaging; high-pass filtering; Proper-Orthogonal Decomposition (POD); Wavelet Decomposition (WD) and Wavelet Decomposition/Principal Component Analysis (WD/PCA). The results were analyzed to determine the best method in correctly separating the mean and the fluctuating velocity information, indicating that the WD/PCA performs better compared to other techniques.

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“…Such a model has been developed for application in this work. Rask [27] studied the in-cylinder turbulence during the intake and the early part of the compression stroke and noted anisotropic behaviour at such times. However, turbulence has been noted to become approximately homogeneous and isotropic in both swirling [28±31] and tumbling flows [32±34] as top dead centre (TDC) is approached.…”

Section: In-cylinder Flow Modellingmentioning

confidence: 99%

Modelling the effects of combustion and turbulence on near-wall temperature gradients in the cylinders of spark ignition engines

Jenkin

James

Malalasekera

1998

Proceedings of the Institution of Mechanical Engineers, Part D:

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• This is an article from the journal, Proceedings of the IMechE, Part D: Abstract: An existing quasi-dimensional engine cycle model has been modified to enable accurate prediction of the near-wall temperature field in the burned and unburned gases. This has been achieved by dividing the cylinder into a number of discrete masses, each of which has a unique state. These discrete masses are assumed to remain stacked in layers adjacent to the cylinder walls in both the unburned gas and in the discrete segments generated during the sequential burning process. A kÀå turbulence model has been incorporated into the engine cycle simulation, providing information on the nature of the instantaneous in-cylinder turbulence for input to a fractal flame model to depict the flame propagation process. When this approach is applied to the prediction of the flame propagation rate, excellent comparison is afforded between simulated and measured pressure±crank angle diagrams. Further validation is provided by comparison of near-wall temperature predictions with measured ones and the essential features of the observed boundary layer behaviour are reproduced.

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Laser Doppler Anemometer Measurements in an Internal Combustion Engine

Cited by 83 publications

References 13 publications

PIV, high-speed PLIF and chemiluminescence imaging for near-spark-plug investigations in IC engines

PIV, high-speed PLIF and chemiluminescence imaging for near-spark-plug investigations in IC engines

Comparative Analysis of Velocity Decomposition Methods for Internal Combustion Engines

Modelling the effects of combustion and turbulence on near-wall temperature gradients in the cylinders of spark ignition engines

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