LES numerical study on in–injector cavitating flow

• Autorzy: Pyszczek R. , Kapusta Ł. J. , Teodorczyk A.
• Języki publikacji: EN

Abstrakty

EN

In this paper a computational study on hexane flow in a fuel injector is presented. Large Eddy Simulation (LES) was used to capture the turbulent patterns present in the flow. The main aim was to investigate the cavitation phenomenon and its interaction with turbulence as well as the influence of injection pressure and backpressure on fuel mass flow and flow conditions. Analysis of the approach to define the outlet boundary conditions in terms of convergence time and fluid mass outflow oscillations formed a crucial part of the study. Numerical simulations were performed with AVL Fire CFD (Computational Fluid Dynamics) software. The Euler-Euler approach and multifluid model for multiphase flow modelling were applied. Injector needle movement was included in the simulation. Results show that the additional volumes attached to the nozzle outlets improved the convergence of the simulations and reduced mass outflow oscillations. Fuel mass flow at the outlets was dependent on inlet pressure, position of the needle and backpressure, while the influence of backpressure on fuel mass flow was negligible. The presence of the vapor phase at the exit of the nozzles did not affect average fuel mass flow. All the simulations showed interaction between the gaseous phase distribution and the turbulence of the flow.

Słowa kluczowe

EN

cavitation; cavitating flow; in-injector flow; Eulerian multiphase; multiphase flow; numerical simulation; Large Eddy Simulation; LES

PL

kawitacja; przepływ kawitacyjny; przepływ wtryskiwacza; przepływ wielofazowy; symulacja numeryczna; metoda dużych wirów

• Wydawca: Institute of Heat Engineering, Warsaw University of Technology
• Czasopismo: Journal of Power Technologies
• Rocznik: 2017
• Tom: Vol. 97, nr 1
• Strony: 52--60
• Opis fizyczny: Bibliogr. 32 poz., rys., wykr.

Twórcy

autor

Pyszczek R.

• Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska Street 21/25, 00-665 Warsaw, Poland

autor

Kapusta Ł. J.

• Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska Street 21/25, 00-665 Warsaw, Poland

autor

Teodorczyk A.

• Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska Street 21/25, 00-665 Warsaw, Poland

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).