Abstract
Transient dynamics of two injection flows, upstream and downstream a swirl injector, are investigated. Capillary n-heptane pipe flow is measured using laser Doppler anemometer 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 droplets velocity-size and number density into fuel spray. All measurements are employed at similar temporal resolution close to 30 μs. Results indicate that both flows are strongly time-dependent and well correlated in time-phases. Initial transitions are completed by 100 μs. Opening or closing of the injector valve affects both flows as strong delta oscillation causes spray penetration dynamics and a post injection effect. A combination of intrusive laser-based techniques allows indication of the basic injection and spraying characteristics need to optimize high-pressure fuel injectors and combustion late injection mode at a high speed.
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Received: 19 December 1998/Accepted: 13 August 1998
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Ismailov, M., Obokata, T., Kobayashi, K. et al. LDA/PDA measurements of instantaneous characteristics in high pressure fuel injection and swirl spray. Experiments in Fluids 27, 1–11 (1999). https://doi.org/10.1007/s003480050323
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DOI: https://doi.org/10.1007/s003480050323