Thermal effects on the diesel injector performance through adiabatic 1D modelling. Part I: Model description and assessment of the adiabatic flow hypothesis

Salvador, Francisco; Gimeno, J.; Martín, Javier Rodríguez; Carreres, Marcos

doi:10.1016/j.fuel.2019.116348

Cited by 16 publications

(6 citation statements)

References 50 publications

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“…The injection time of the CR injector is very short and scholars have suggested that this extremely short injection time leads to fuel heating caused by the pressure difference that occurs too late to be alleviated by heat transfer through the wall to the environment. The flow state of the fuel inside the injector is considered an adiabatic compressible flow under this assumption and related research has been carried out [9]. In this study, an adiabatic flow calculation model was developed based on the isothermal flow calculation model for the CR injector (Figure 2), as shown in Figure 4.…”

Section: Study On the Simulation Model Of Cr Injector Under Adiabatic...mentioning

confidence: 99%

“…This led to a change in the cavitation characteristics at the entrance of the injection hole, which significantly affected the injection quantity. Salvador et al [9] and Payri et al [10] used AMESim software to establish an adiabatic flow model for a CR injector and analyzed the variation in the fuel temperature increase at each orifice in the injector for different pre-main injection time intervals. They noted that the temperature increase in the fuel after flowing through an orifice was significantly affected by the initial fuel temperature and pressure difference.…”

Section: Introductionmentioning

confidence: 99%

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Study on Dynamic Injection Prediction Model of High-Pressure Common Rail Injector under Thermal Effect

Liu¹,

Li²,

Wu³

et al. 2022

Energies

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This study investigates a prediction model for the cycle injection quantity in a high-pressure common rail injector under a transient thermal boundary. The results show that the transient temperature increase curve calculated by the mathematical model of the common rail injector under adiabatic flow is significantly different from the experimental data. A non-isothermal model of the injector coupled with heat transfer is established, which considers the actual heat transfer phenomenon. The excellent agreement between the new calculation results and the experimental data confirms that the fuel injection process of a common rail injector comprises the coupled phenomena of fuel heating and heat transfer. Based on the established simulation model, it is found that in the continuous injection process of the injector, owing to the thermal effect of injection, the cycle injection quantity decreases gradually with an increase in the injector working time and then stabilizes. Under the condition of an injection pulse width of 1.2 ms and frequency of 100 Hz, when the injection pressure increases from 140 MPa to 300 MPa, the reduction in the cycle injection quantity increases from 3.9% to 7.8%, because the higher injection pressure results in higher transient heat at the nozzle holes. In the work of common rail injector assemblies, to achieve more accurate control of the cycle injection quantity, it is necessary to include the correction of a decreasing cycle injection quantity caused by transient heat in the electronic control system.

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Section: Study On the Simulation Model Of Cr Injector Under Adiabatic...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Injection Prediction Model of High-Pressure Common Rail Injector under Thermal Effect

Liu¹,

Li²,

Wu³

et al. 2022

Energies

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show abstract

“…Injection rate simulations are a valuable tool for the reduction of experimental time and error reduction, allowing the simulation of operating conditions that would be dangerous for the experimental equipment. Simulations of injection rates can be performed with zero-dimensional (0D) models [30,31], or multidimensional models in combination with other mathematical and software tools [32][33][34]. 0D models are simple to implement and require limited experimental trials [29].…”

Section: Introductionmentioning

confidence: 99%

Zero-Dimensional Modeling of the Rate of Injection with a Diesel Common Rail System Using Single-Hole Nozzles with Neat Low-Carbon Fuels

Rojas-Reinoso,

Mata,

Soriano

et al. 2024

Applied Sciences

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This paper presents a fuel injection rate predictive model based on zero-dimensional correlations from experimental results. This model estimates the fuel injection rate behavior with varying parameters such as fuel injection pressure-injector energizing, the injection nozzle geometrical characteristics, and fuel viscosity. The model approach was carried out with diesel fuel. Then, the model was applied to the use of two alternative low-carbon fuels without diesel. An experimental methodology was used under controlled conditions, employing an injection rate indicator to measure the injection parameters in real time. The setup was carried out on a pump test bench using a common rail injection system. The results show that the model can be adapted to different injection conditions and fuels.

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“…By introducing adiabatic flow assumption into the isothermal injector calculation model, the local fuel temperature variation along the flow direction in the injector was calculated. [18][19][20] Results showed significant changes in fuel temperature across some injector restrictions, and thermal effects also influenced the injection rate and duration. Bae et al 21 experimentally analyzed the influence of fuel temperature on the transient needle movement and fuel injection speed, and the researchers believed that the increase of fuel temperature would lead to a reduced injection duration and fuel injection speed.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of fuel injection performance of a common rail injector

Fan

Lan

et al. 2023

International Journal of Engine Research

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The improvement of injector performance is important for the operation of common rail (CR) fuel systems. In this study, the optimization work has been carried out on a large-flow common rail injector. First, to simulate the injection process, a one-dimensional (1-D) model was developed and validated against the experimental data. The mathematical approximation model was also established to correlate the injection performance with the factors. Then, a multi-objective model by taking three design objectives into account was established and solved. Finally, Pareto front was obtained and the final optimization solution was determined. Furthermore, an extensive validation and analysis for the optimized results under various operating conditions was also carried out. Results shows that the three objectives, total response time, injection pressure fluctuation and injection pressure drop respectively, are improved by 11.75%, 39.12%, and 10.03% under the typical condition. And the proposed multi-objective optimization program based on design of experiment (DOE) technique, response surface methodology (RSM) and Elitist Non-dominated sorting genetic algorithm (NSGA-II) in present work can exhibit a good capability to optimize the problem of the injection performance in a CR fuel system.

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Thermal effects on the diesel injector performance through adiabatic 1D modelling. Part I: Model description and assessment of the adiabatic flow hypothesis

Cited by 16 publications

References 50 publications

Study on Dynamic Injection Prediction Model of High-Pressure Common Rail Injector under Thermal Effect

Study on Dynamic Injection Prediction Model of High-Pressure Common Rail Injector under Thermal Effect

Zero-Dimensional Modeling of the Rate of Injection with a Diesel Common Rail System Using Single-Hole Nozzles with Neat Low-Carbon Fuels

Multi-objective optimization of fuel injection performance of a common rail injector

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