レーザシート法によるシリンダ内流れの三次元測定(熱工学,内燃機関,動力など)

概要

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Analysis of the cycle-by-cycle variation of combustion in an internal combustion engine can be aided by the cycle-resolved measurement of the in-cylinder gas velocity. This paper describes the principle and operation of, and results obtained from, a particle coded-pulse velocimeter (PCPV) which measured the three components of velocity within normal planes to the axis of cylinder. The PCPV was applied to a 1.5 litre lean-burn engine in order to record the flow pattern. The intake air was seeded with light microcapsules of approximately 50μm diameter which scattered light from a system of up to two sets of three plane laser sheets, distinguished by colour and thickness and pulsed by acousto-optic modulators, illuminating planes in the bore of the engine. The magnitudes of the axial and cross bore components of the velocity vector were found from the measured lengths and the duration of the particle tracks. The results from the PCPV measurements are time-resolved and instantaneously three-dimensional and thus the PCPV is capable of identifying the transition from a disordered flow, such as the intake prosess, to well-ordered flows such as occur during a compression process. The derived swirl and tumble ratios were relatively in good agreement with those measured by an inpulse swirl meter.
社団法人日本機械学会の論文
1997-01-25