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Influence of diesel nozzle geometry on cavitation using eulerian multi-fluid method

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Abstract

Dependent on automatically generated unstructured grids, a comprehensive computational fluid dynamics (CFD)numerical simulation is performed to analyze the influence of nozzle geometry on the internal flow characteristics of a multi-hole diesel injector with the multi-phase flow model based on Eulerian multi-fluid method. The diesel components in nozzle are considered as two continuous phases, diesel liquid and diesel vapor respectively. Considering that both of them are fully coupled and interpenetrated, separate sets of governing equations are established and solved for each phase. The geometric parameters mainly include the length and exit diameter of nozzle, the rounded radius at inlet of nozzle orifice and the angle between axis of injector and axis of nozzle orifice, and they are individually taken into account to analyze the impact on the cavitating flow in nozzle. The results show that the geometrical characteristics of nozzle have a strong influence on the volume fraction of diesel vapor in nozzle and the outlet flow velocity of injector. So cavitation in nozzle orifice should not be neglected for the in-cylinder fuel atomization process, especially for the primary break-up of liquid jet.

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Authors and Affiliations

  1. Internal Combustion Engine Research Institute, Tianjin University, Tianjin, 300072, China

    Jun Zhang  (张 军), Qing Du  (杜 青) & Yanxiang Yang  (杨延相)

  2. State Key Laboratory of Engines, Tianjin University, Tianjin, 300072, China

    Qing Du  (杜 青)

Authors
  1. Jun Zhang  (张 军)
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  2. Qing Du  (杜 青)
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  3. Yanxiang Yang  (杨延相)
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Corresponding author

Correspondence to Qing Du  (杜 青).

Additional information

Supported by National Natural Science Foundation of China (No. 50876072) and Tianjin Municipal Science and Technology Commission (No. 07JCYBJC03900).

ZHANG Jun, born in 1982, male, doctorate student.

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Zhang, J., Du, Q. & Yang, Y. Influence of diesel nozzle geometry on cavitation using eulerian multi-fluid method. Trans. Tianjin Univ. 16, 33–39 (2010). https://doi.org/10.1007/s12209-010-0007-4

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  • DOI: https://doi.org/10.1007/s12209-010-0007-4

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