Laser Doppler Anemometer Measurements in an Internal Combustion Engine

This research demonstrates the capability of the Laser Doppler Anemometer (LDA) for making measurements inside a piston-engine cylinder. The backscatter mode of LDA operation, requiring only a single window in the cylinder, was used. An ensemble-average data-processing technique has been developed t...

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Bibliographic Details
Published in:SAE transactions 1979-01, Vol.88, p.371-382
Main Author: Rask, Rodney B.
Format: Article
Language:English
Subjects:
Cylinders
Data smoothing
Engines
Flow velocity
Instantaneous velocity
Lasers
Speed
Turbulence
Velocity
Velocity measurement
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Summary:This research demonstrates the capability of the Laser Doppler Anemometer (LDA) for making measurements inside a piston-engine cylinder. The backscatter mode of LDA operation, requiring only a single window in the cylinder, was used. An ensemble-average data-processing technique has been developed to analyze the raw velocity-crankangle data. Single-component measurements of mean velocity and rms velocity fluctuation at a single point are presented as functions of crankangle for three engine speeds. A comparison of motored and fired results is shown for one engine speed. Measurements of two components of velocity at several locations show the basic vortical nature of the flow field in this particular engine.
ISSN:0096-736X
2577-1531