Computational assessment of temperature variations through calibrated orifices subjected to high pressure drops: Application to diesel injection nozzles

Salvador, Francisco; Carreres, Marcos; Morena, Joaquín De la; Martínez-Miracle-Muñoz, Enrique Carlos

doi:10.1016/j.enconman.2018.05.102

Cited by 17 publications

(7 citation statements)

References 39 publications

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“…It is important to note that, given the 1D approach followed in this work, the values of ΔT presented correspond to the fuel bulk temperature. A similar result has been reported in the literature through 3D CFD approaches by Theodorakakos et al [32] , Strotos et al [33] and the authors [34], showing that the fuel temperature is expected to vary in the radial direction, being heated in the wall vicinities where the friction losses are located (boundary layer) and being subcooled near the orifices axes. The transitional Cd among heating and cooling in steady-state conditions is slightly lower than the maximum discharge coefficient of the nozzle orifices.…”

Section: Analysis For the Nozzle Orificessupporting

confidence: 88%

Thermal effects on the diesel injector performance through adiabatic 1D modelling. Part II: Model validation, results of the simulations and discussion

Payri

Salvador

Carreres

et al. 2020

Fuel

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In this paper, a one-dimensional computational model of the flow in a common-rail injector is used to compute local variations of fuel temperature (including the temperature change produced upon expansion across the nozzle) and analyse their effect on injector dynamics. These variations are accounted through the adiabatic flow hypothesis, assessed in a first part of the paper where the model features are also described. They imply variations in the fuel properties and the flow

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Section: Analysis For the Nozzle Orificessupporting

confidence: 88%

Thermal effects on the diesel injector performance through adiabatic 1D modelling. Part II: Model validation, results of the simulations and discussion

Payri

Salvador

Carreres

et al. 2020

Fuel

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“…The injector ran with n-dodecane fuel, whose main physical properties are gathered on Table 1 for the experimental conditions used along the tests. These values have been obtained using similar expressions as the ones found in [32] as a function of pressure, but adapted for ndodecane based on the information in [33]. A constant duration of the electronic pulse to the piezoeletric valve of 2 ms is selected to ensure that the hydraulic duration of the injection event is long enough.…”

Section: Methodsmentioning

confidence: 99%

Experimental analysis of the injection pressure effect on the near-field structure of liquid fuel sprays

Salvador

Gimeno

Morena

et al. 2021

Fuel

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“…If a 2000 bar injection is considered, the maximum temperature difference in the flow can reach 80°C between the fluid at the core region and the one at the walls, which is a remarkable value if the temperature dependence of the fuel properties is taken into account. 27 All this highlights a significant role of thermal aspects in the hydraulic performance of a CR system.…”

Section: Introductionmentioning

confidence: 96%

Thermal effects on Common Rail injection system hydraulic performance

Ferrari

Vento

2023

International Journal of Engine Research

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The effect of the fuel temperature on the hydraulic performance of a Common Rail diesel injector has been investigated with an integrated experimental-numerical approach. An experimental campaign pertaining to single and double injections has been performed for fuel tank temperatures ranging from 28°C to 68°C. In general, an augment in the injected mass has been observed for increasing values of the fuel tank temperature. Moreover, the interaction between the main and after injection changes with the temperature and the dwell time threshold for fusion-free injections increases with the fuel temperature. The temperature at the injector nozzle has been measured and compared with that obtained with a thermo-fluid dynamics simple model, showing that the real temperature and the estimated one correlate well. The influence of the fuel temperature on the internal injector dynamic has been explored by means of a validated 1D numerical model of the injector thermo-fluid dynamics. The main direct effect of the temperature variation concerns the needle lift, which reaches a larger peak value for a higher fuel temperature: this explains the general increment in the injected mass and the augmented value of the injection fusion threshold for the main-after injections. The obtained results could allow more accurate open-loop control strategies for the injected mass, which include thermal effects, to be implemented.

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Computational assessment of temperature variations through calibrated orifices subjected to high pressure drops: Application to diesel injection nozzles

Abstract: Computational assessment of temperature variations through calibrated orifices subjected to high pressure drops: application to diesel injection nozzles.. Energy

Cited by 17 publications

References 39 publications

Thermal effects on the diesel injector performance through adiabatic 1D modelling. Part II: Model validation, results of the simulations and discussion

Thermal effects on the diesel injector performance through adiabatic 1D modelling. Part II: Model validation, results of the simulations and discussion

Experimental analysis of the injection pressure effect on the near-field structure of liquid fuel sprays

Thermal effects on Common Rail injection system hydraulic performance

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