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Atomization and Sprays

Published 12 issues per year

ISSN Print: 1044-5110

ISSN Online: 1936-2684

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.2 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.8 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00095 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.28 SJR: 0.341 SNIP: 0.536 CiteScore™:: 1.9 H-Index: 57

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EXPERIMENTAL AND COMPUTATIONAL STUDY OF THE INFLUENCE OF PARTIAL NEEDLE LIFT ON NOZZLE FLOWIN DIESEL FUEL INJECTORS

Volume 22, Issue 8, 2012, pp. 687-714
DOI: 10.1615/AtomizSpr.2012005810
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ABSTRACT

This paper presents an experimental and computational study with the aim of developing a fundamental understanding of the nozzle internal flow behavior in a prototype piezo-stack injector with a multi-orifice nozzle, which allows controlling the needle position at different percentages of its maximum lift. In order to characterize the flow behavior, several measurements of mass flow rate and spray momentum flux have been carried out at different rail pressures (up to 200 MPa). Furthermore, to develop a deep understanding of the internal flow behavior, computational fluid dynamic simulations have been carried out using the software OpenFOAM in order to determine the pressure drop through the nozzle seat and estimate the real needle lift at different conditions. The experimental results demonstrate the nozzle flow behavior and the commonly used nondimensional coefficients; an interesting reduction in the nozzle discharge coefficient at partial lifts (needle positions smaller than the maximum lift) is shown. The computational results allow the estimation of the pressure and velocity profiles in the needle seat at different needle positions. Afterwards, the pressure drop through the needle seat and the real needle lift is determined for each test condition. Thus, with the velocity profiles obtained, the variation in both the dynamic pressure and flow directionality at the orifice inlet could be determined. Thus the decrease of effective area and its dependency on the lift were justified since the calculation of these nondimensional coefficients assumes only static pressure upstream the hole conditions.

CITED BY
  1. Payri Raul, Gimeno Jaime, Viera Juan P., Plazas Alejandro H., Needle lift profile influence on the vapor phase penetration for a prototype diesel direct acting piezoelectric injector, Fuel, 113, 2013. Crossref

  2. Payri R., Gimeno J., Marti-Aldaravi Pedro, Vaquerizo D., Momentum Flux Measurements on an ECN GDi Injector, SAE Technical Paper Series, 1, 2015. Crossref

  3. Payri Raul, Gimeno Jaime, Mata Carmen, Viera Alberto, Rate of injection measurements of a direct-acting piezoelectric injector for different operating temperatures, Energy Conversion and Management, 154, 2017. Crossref

  4. Marti-Aldaravi Pedro, Saha Kaushik, Gimeno Jaime, Som Sibendu, Numerical Simulation of a Direct-Acting Piezoelectric Prototype Injector Nozzle Flow for Partial Needle Lifts, SAE Technical Paper Series, 1, 2017. Crossref

  5. Fang Ming-Hui, Yu Tao, Xi Feng-Feng, Effect of back pressure on the grinding performance of abrasive suspension flow machining, Advances in Manufacturing, 10, 1, 2022. Crossref

  6. Viera Juan P., Payri Raul, Swantek Andrew B., Duke Daniel J., Sovis Nicolas, Kastengren Alan L., Powell Christopher F., Linking instantaneous rate of injection to X-ray needle lift measurements for a direct-acting piezoelectric injector, Energy Conversion and Management, 112, 2016. Crossref

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