Cycle Resolved LDV Measurements on a Fired SI-Engine at High Data Rates Using a Conventional Modular LDV-System

Lorenz, M.; Prescher, K.

doi:10.4271/900054

Cited by 18 publications

(2 citation statements)

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“…This assumption is considerably weaker than the assumption of isotropic turbulence, which is usually adopted to calculate a turbulent length-scale from one or zero dimensional velocity fields, obtained from LDV measurements [5,7].…”

Section: Analysis Of the Velocity Datamentioning

confidence: 99%

“…The compression of turbulence is performed in a piston engine with a pancake chamber. In the literature the determination of turbulent length-scales and turbulence intensities in a piston engine using laser doppler velocimetry (LDV) have been detailed by Hüppelshäuser [5], Hong and Tarng [6], and Lorenz and Prescher [7] to name only a few. In order to determine turbulent length-scales the LDV technique is applied simultaneously at two points in space.…”

Section: Introductionmentioning

confidence: 99%

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Non-Isotropic Length Scales During the Compression Stroke of a Motored Piston Engine

Breuer

Oberlack²,

Peters³

2005

Flow Turbulence Combust

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For the case of axial compression the two-point velocity correlation equations of axisymmetric homogeneous turbulence are derived. Appropriate integrations then lead to equations for the components of the Reynolds stress tensor as well as to those for the two independent integral length-scales characterizing axisymmetric homogeneous turbulence. These equations contain a certain number of empirical constants. Values for these constants are taken from the literature, or were adjusted from the present data.The resulting model is validated using data from a motored piston engine. The flow field, which has negligible swirl and tumble, has been measured using particle image velocimetry (PIV). Since turbulence is axisymmetric and homogeneous in the counter region, two-dimensional PIV provides the time history of the axial and radial length-scales. The experimental data are compared with the mathematical model.

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Section: Analysis Of the Velocity Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%