LDA/PDA measurements of instantaneous characteristics in high pressure fuel injection and swirl spray

Transient dynamics of two injection flows, upstream and downstream a swirl injector, are investigated. Capillary n-heptane pipe flow is measured using LDA to obtain instantaneous time series of centerline velocity and to reconstruct series of instantaneous and integrated flow rates and pressure grad...

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Bibliographic Details
Published in:Experiments in fluids 1999-06, Vol.27 (1), p.1-11
Main Authors: Ismailov, M. M., Obokata, T., Kobayashi, K., Polayev, V. M.
Format: Article
Language:English
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Summary:Transient dynamics of two injection flows, upstream and downstream a swirl injector, are investigated. Capillary n-heptane pipe flow is measured using LDA to obtain instantaneous time series of centerline velocity and to reconstruct series of instantaneous and integrated flow rates and pressure gradient. A collimated laser sheet and a high-speed video camera visualize injected spray flow. Finally, the phase Doppler anemometer measurements are introduced to analyze instantaneous patterns of droplet velocity, size, and number density into fuel spray. All measurements are employed at similar temporal resolution close to 30 microsec. Results indicate that both flows are strongly time-dependent and well correlated in time phases. Initial transitions are completed by 100 microsec. Opening or closing of the injector valve affects both flows, as strong delta oscillation causes spray penetration dynamics and a post-injection effect. (Author)
ISSN:0723-4864
1432-1114
DOI:10.1007/s003480050323