Steady-State Experiment and Simulation of Intake Ports in a Four-Valve
                        Direct Injection Diesel Engine

Jia, Dewen; Deng, Xiwen; Lei, Jilin

doi:10.29252/jafm.11.01.27494

Cited by 6 publications

(5 citation statements)

References 10 publications

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“…The cavity diameter of the chamber was 51.6 mm and the engine had a compression ratio of 16.3. One helical and one tangential intake port were used as this combination generates a higher swirl ratio compared to two tangential or two helical ports [21]. The location of the ports as seen from the top of the cylinder and the coordinate axes in the x, y and z directions are shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Airflow Characteristics Investigation of a Diesel Engine for Different Helical Port Openings and Engine Speeds

Anggono

Ichiyanagi

Saito

et al. 2021

J. Eng. Technol. Sci.

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Intake airflow characteristics are essential for the performance of diesel engines. However, previous investigations of these airflow characteristics were mostly performed on two-valve engines despite the difference between the airflow of two-valve and four-valve engines. Therefore, in this study, particle image velocimetry (PIV) investigations were performed on a four-valve diesel engine. The investigations were conducted under different engine speeds and helical port openings using a swirl control valve (SCV). The results suggest that the position of the swirl center does not significantly shift with different engine speeds and helical port openings, as the dynamics of the flow remained closely similar. The trends of the airflow characteristics can be best observed during the compression stroke. A higher engine speed increases the angular velocity of the engine more compared to the increase of the airflow velocity and results in a lower swirl ratio of the flow. On the other hand, a higher engine speed leads to a higher mean velocity and the variation of velocity results in a larger turbulence intensity of the flow. Increasing the helical port opening brings a reduction in the swirl ratio and turbulence intensity as more airflow from the helical port disturbs the airflow from the tangential port.

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Section: Methodsmentioning

confidence: 99%

Airflow Characteristics Investigation of a Diesel Engine for Different Helical Port Openings and Engine Speeds

Anggono

Ichiyanagi

Saito

et al. 2021

J. Eng. Technol. Sci.

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“…4 (a). Automatic mesh generation was conducted using the AVL FAME Hybrid pretreatment function module for the ports (Jia et al 2018). To accurately analyze the gas flow around the valve section, refining the mesh of the cylinder and the valve seat was necessary.…”

Section: Simulation Model and Verification (1) Construction And Verif...mentioning

confidence: 99%

Influence of Intake Valve Structure Combined with Valve Lift Dissimilitude on Intake Performance of Diesel Engine

2023

JAFM

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For diesel engines equipped with a combined spiral/tangential inlet, the main object of the valve structure and valve lift dissimilitude strategies is the valve, the changes of both will alter the motion state of the in-cylinder airflow, which has an important impact on the formation and combustion of the mixture. In order to investigate the flow performance of valve structure and valve lift dissimilitude, this paper used computational fluid dynamics (CFD) numerical simulation and multi-parameter regression methods to optimize the dual intake valve structure and obtained three valve structures with better intake performance first. Then, the optimized intake valve structure models were combined with the valve lift dissimilitude schemes to conduct steady-flow tests for the intake port. Through the reasonable combining of the two, the intake performance of the original engine was further improved. The results show that the valve structure has a relatively small influence on the intake mass, while it has a greater effect on the formation of the swirl in the cylinder, increasing the swirl ratio by 8.0%. The optimized valve structure model was combined with the valve lift dissimilitude scheme. It was found that the valve structure with optimal intake mass combined with the dissimilitude scheme of the largest valve lift of the spiral inlet could increase the flow coefficient by a maximum of 1.9%. The valve structure of the optimal swirl ratio combined with the dissimilitude scheme of the largest valve lift of the tangential inlet could increase the swirl ratio by a maximum of 9.7%. This study can guide diesel engines with combined intakes to increase the intake mass and improve the intake performance.

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“…4,13 However, it should be noted that the database used for training the ANN is commonly built by the numerical simulation results due to the cost, thus the accuracy of the numerical simulation is critical to the results of ports optimization, so a lot of research work on port simulation has been done by researchers. Table 1 gives the accuracy of the simulation results in the past decade, [30][31][32][33][34][35][36] in which the T-port means tangential port and the H-port means helical port. In the previous work, 30,31 the simulation of intake ports mainly aimed to predict the flow coefficient, and the predicted result of swirl ratio was only used to reflect the changing trends along with the increased valve lifts.…”

Section: Introductionmentioning

confidence: 99%

“…In the previous work, 30,31 the simulation of intake ports mainly aimed to predict the flow coefficient, and the predicted result of swirl ratio was only used to reflect the changing trends along with the increased valve lifts. In the later work, [32][33][34][35][36] the prediction accuracy of the swirl ratio was improved under the medium and high valve lifts, but the prediction accuracy of the flow coefficient still cannot be accurately predicted. Besides, the same numerical simulation strategy had a great difference in the simulation results of different ports.…”

Section: Introductionmentioning

confidence: 99%

The full-parametric development of the intake ports by using genetic algorithm in a four-valve diesel engine

Gao

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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In-cylinder flow characteristics, which are mainly determined by the intake ports, have a decisive influence on the mixture formation and combustion process of internal combustion (IC) engines. To develop the optimum intake ports in a four-valve diesel engine, the full-parametric design method coupled with genetic algorithm (GA) and artificial neural network (ANN) was adopted in this study. Different from previous studies, the full-parametric templates for the tangential and helical ports were established. Then, to improve the precision of the CFD result which was used to train the ANN, the near-wall region affected by viscosity was resolved by the “enhanced wall treatment” during the simulation process. Besides, considering the interaction between the outlets of adjacent intake ports in the four-valve engine, the ANN was divided into three parts to better predict the flow performance of the combined intake ports. Finally, the developed intake ports based on ANN and GA were machined to the flow box and validated by the steady flow test. The low deviation of 4.71% in swirl ratio between the design target and the experiment result confirms that this method can be well applied to the development of the intake ports in a four-valve diesel engine.

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Steady-State Experiment and Simulation of Intake Ports in a Four-Valve Direct Injection Diesel Engine

Cited by 6 publications

References 10 publications

Airflow Characteristics Investigation of a Diesel Engine for Different Helical Port Openings and Engine Speeds

Airflow Characteristics Investigation of a Diesel Engine for Different Helical Port Openings and Engine Speeds

Influence of Intake Valve Structure Combined with Valve Lift Dissimilitude on Intake Performance of Diesel Engine

The full-parametric development of the intake ports by using genetic algorithm in a four-valve diesel engine

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