Experimental and Modeling Study of the Effect of Manufacturing Deviations on the Flow Characteristics of Tangential Intake Port in a Diesel Engine

Lu, Zhen; Wang, Tianyou; Liu, Shuliang; Liu, Zhiqiang; Han, Yan

doi:10.1115/1.4027557

Cited by 6 publications

(8 citation statements)

References 20 publications

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“…The experiment measurements and predicted results determined by equation (5) for different combustion chambers were presented in Figure 10, which shows that the model can satisfactorily predict the trend of the swirl ratio during the compression stroke, even though there is a certain estimation error. The reasons for the errors of the compression swirl ratio may lie in the underestimation of the swirl ratio at IVC.…”

Section: Prediction Of the Swirl Ratio Inside The Piston Bowl During mentioning

confidence: 91%

“…Therefore, to study the correlation between the swirl decay and the SV, the decay coefficients of the seven combustion chambers (with different SVs) were measured in this work. According to Figure 8, in a diesel engine with the cylindrical piston bowl, SV could be expressed as Accordingly, by rearranging equation (5), the decay coefficient can be determined as…”

Section: The Swirl Decay During the Compression Strokementioning

confidence: 99%

“…Since the key problems for the prediction of the swirl ratio by equation (5) were discussed above, the prediction of the swirl ratio inside the piston bowl will be performed and verified in this section.…”

Section: Prediction Of the Swirl Ratio Inside The Piston Bowl During mentioning

confidence: 99%

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Prediction of the in-piston-bowl swirl ratio of diesel engines

Sun

Wang

Wen

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Steady flow tests are widely used to evaluate the performance of intake ports in generating swirl flow in diesel engines. Such test data, however, may deviate largely from the real in-piston-bowl swirl ratio due to the complex unsteady air motion in the compression stroke. In this study, a new method is proposed to predict the unsteady in-piston-bowl swirl ratio of diesel engines from steady flow test data by focusing on three key steps, including the swirl field at intake valve close timing, swirl enhancement due to squish flow, and swirl decay during the compression stroke. Experimental results on an optically accessible diesel engine under non-firing conditions show that, at intake valve close, the relationship between the swirl ratio and the vertical location was approximately linear and the mean swirl ratio could be fitted by a Bessel function; the correlation between the swirl decay coefficient and surface-to-volume ratio was built by fitting the experiment data. Furthermore, the in-piston-bowl swirl ratio during the compression stroke could then be derived according to the conservation of angular momentum.

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Section: Prediction Of the Swirl Ratio Inside The Piston Bowl During mentioning

confidence: 91%

Section: The Swirl Decay During the Compression Strokementioning

confidence: 99%

See 1 more Smart Citation

Prediction of the in-piston-bowl swirl ratio of diesel engines

Sun

Wang

Wen

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

Self Cite

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“…Moreover, intake flow characteristics are affected by different shapes of the intake port structure, port position in the cylinder head, and the combination patterns of the two ports. Therefore, in order to develop high efficiency and low emissions four-valve DI diesel engines, it is important to systematically study the effects of different combinations of intake ports on intake flow characteristics (Kawaguchi at al .,2009, Andreatta et al,2008, Li Yufeng at al .,2001, Li Yufeng and Wang Zhong,2004,Lu Z. et al,2014,and Cui L.et al,2015.…”

Section: Introductionmentioning

confidence: 99%

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

Jia

Deng

Lei

2018

JAFM

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In order to analyze intake port flow characteristics of a four-valve direct injection (DI) diesel engine, steadystate flow bench experiments and numerical simulations method were coupled to investigate the following four combined intake ports: (1) helical port (left) and tangential port (right); (2) tangential port (left) and helical port (right); (3) helical port (left) port and helical (right); and (4) tangential port (left) and tangential (right) port. Results show that the simulation of port flow coefficients matches experimental findings very well, and the port coefficients of the above four combinations do not vary much, but their swirl ratios are very different. Specifically, when the valve lift is the maximum, the swirl ratio of the combination of "helical and tangential" is the greatest among the four combinations, and the swirl ratio of "tangential and tangential" is the minimum. And the3D fluid simulation method and steady-state experiment are important means to investigate the flow characteristics of the combined intake ports.

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“…The four main problems that notably influence in the cylinder head ports intake flow in consequence of casting or machining process [9]:  Inclination;  Eccentricity;  Swelling;  Deformation;…”

Section: Introductionmentioning

confidence: 99%

Swirl Number Measurements Using Intake Ports Produced by Additive Manufacturing

Martioli¹,

Massarani²

2017

Blucher Engineering Proceedings

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The present work proposes to execute bench test swirl number measurements using a modular device and cylinder head intake ports from a diesel engine manufactured via additive manufacturing (AM). Swirl number measurements with intake ports produced by AM, bring the following advantages: Tests reproducibility, since having the geometric model (CAD) of tested models is enough to re-build the geometry analyzed in the bench test. Easy to measure the swirl number variances in consequence of potential manufacturing process deviations and time reduction to the development of new intake ports geometry. The research is experimental, one sample of the investigated cylinder head was sent to the Polytechnic School of Sao Paulo (EPUSP) laboratory, and the swirl number was measured and recorded for later results comparison with proposed method. This cylinder head sample was then sectioned and digitalized as to know to have the same internal geometry in the intake ports produced via AM. All tests were performed in the same rig and with the same control system aiming to reduce the external variables during data acquisition. When the swirl number results between the complete cylinder head and modular device using AM were compared, no statistically significant changes were found.

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Experimental and Modeling Study of the Effect of Manufacturing Deviations on the Flow Characteristics of Tangential Intake Port in a Diesel Engine

Cited by 6 publications

References 20 publications

Prediction of the in-piston-bowl swirl ratio of diesel engines

Prediction of the in-piston-bowl swirl ratio of diesel engines

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

Swirl Number Measurements Using Intake Ports Produced by Additive Manufacturing

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