Experimental study and numerical simulation on in-cylinder flow of small motorcycle engine

Wahono, Bambang; Setiawan, Ardhika

doi:10.1016/j.apenergy.2019.113863

Cited by 12 publications

(4 citation statements)

References 31 publications

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“…The discharge coefficient remained constant once the valve opening lift reached approximately 5 mm. Wahono et al [36] presented a similar conclusion by investigating the discharge coefficients measured in steady-state flow bench experiments and simulations for various valve lifts of a small motorcycle engine.…”

Section: Error Analyses By Comparing the U-adolph Predictions And The...mentioning

confidence: 64%

Experimental and Numerical Study on the Dynamic and Flow Characteristics of a Reciprocating Pump Valve

Wen-shu

Líu

et al. 2022

Processes

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The structure and dynamics of a reciprocating pump liquid end affect the volumetric efficiency and net positive suction head. To match the kinematics with theoretical parameters, reciprocating pump valve motion and flow visualization tests and computational fluid dynamics (CFD) analyses were performed on a wing-guided bevel discharge valve in a horizontal quintuple single-acting reciprocating pump. The valve motion test results showed that the maximum pump valve displacement and the pump valve opening and closing durations were approximately 8.3 mm, 29 ms, and 38 ms, respectively. The corresponding flow visualization test results were 11.4 mm, 9.5 ms, and 35.5 ms. The valve closing durations obtained from the valve motion and flow visualization tests are approximately twice as high as the U-Adolph prediction. The maximum displacement obtained from the valve motion test is consistent with the U-Adolph prediction. Three-dimensional CFD analyses were performed to investigate the flow states, pressure, and velocity characteristics of the discharge valve opening. Finally, the proposed method was applied to develop a new horizontal quintuple single-acting reciprocating pump with a rated flow rate of 1250 L/min and pressure of 40 MPa. This developed pump exhibited good performance and excellent reliability.

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Section: Error Analyses By Comparing the U-adolph Predictions And The...mentioning

confidence: 64%

Experimental and Numerical Study on the Dynamic and Flow Characteristics of a Reciprocating Pump Valve

Wen-shu

Líu

et al. 2022

Processes

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“…Experimental studies on in-cylinder flow in combustion engines often focus on one or two specific planes, such as the symmetry plane, tumble plane, parallel planes, cross-tumble plane (orthogonal to the symmetry plane), or horizontal planes [7,54,[58][59][60][61]. While there are various optically accessible engine test rigs that enable the application of different optical techniques, occasionally, there is a need for ad-hoc test rigs to replicate specific air flows or to provide better accessibility [19,[33][34][35]40,[62][63][64][65][66][67]. However, a drawback of such engine test benches is frequently lower flexibility regarding the operating parameters, such as the intake pressure and temperature, as well as the limitation to stationary flows with constant valve lifts.…”

Section: Introduction 1motivationmentioning

confidence: 99%

Investigation of Flow Fields Emanating from Two Parallel Inlet Valves Using LES, PIV, and POD

Hoffmann,

Vera-Tudela,

Mirsch

et al. 2023

Energies

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Understanding cycle-to-cycle variations (CCV) is of practical importance for the combustion of fossil and renewable fuels, as increasingly stringent emission regulations require reductions in the negative effects of such variations. The subject of this study is the flow around inlet valves, since oscillations of such inlet flows affect the flow structure in the cylinder and are thus one of the causes of CCV. To this end, a parametric analysis of the influences of the mass flow rate and valve lift of two parallel engine intake valves on the flow structures is performed. This follows on from an earlier similar study where the flow around a single intake valve was investigated. To analyse the flow behaviour and, in particular, the interactions of the flow leaving these two valves, an optical test rig for 2D particle image velocimetry (PIV) and a large eddy simulation (LES) are used. Proper orthogonal decomposition (POD), together with a quadruple decomposition and the Reynolds stress transport equations, are used to study the turbulence phenomena. The PIV and LES results are in good agreement with each other. The detailed LES analysis of the flow structures shows that, for small valve lifts, the flow separates along the whole perimeter of the intake valve, and for larger valve lifts, the flow escapes only to one side. This is, for combustion engines with the tumble concept, the stage at which the tumble movement develops. Moreover, the flow structures are strongly influenced by the valve lift, while they are unaffected by the variation in the mass flow. The turbulent kinetic energy in the flow field increases quadratically with a decreasing valve lift and increasing mass flow. The large, high-energetic flow structures are particularly dominant near the jet, and the small, low-energetic structures are homogeneously distributed within the flow field. The specific Reynolds stress transport equation shows the limitations of two-dimensionality and large timesteps in the PIV results and the limitations of the LES model.

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“…The engine intake pipe is an important part of the automobile intake system and the first channel to guide the air flow into the combustion chamber for mixed fuel transformation (Li, 2018;Gao et al, 2017). Although the electronically controlled fuel injection engine simplifies the structure of the intake pipe to a certain extent and reduces design considerations, the structural design of its inner wall directly affects the flow law of the air flow and thus the amount of intake air (Zhang et al, 2019;Yi et al, 2018;Wahono et al, 2019). When designing the intake pipe, in addition to considering the performance requirements of different engines, we should also pay attention to the economy and emission of the engine, and consider the atomization and evaporation effect of the fuel and fuel distribution.…”

Section: Introductionmentioning

confidence: 99%

Structural optimization on the design of an automobile engine intake pipe

Xie¹,

Liu²

2022

Journal of Theoretical and Applied Mechanics

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The engine intake pipe is an important part of the engine. A reasonable layout of the intake pipe can prolong service life of the engine and improve engine power. The optimization of design of the intake pipe has a great impact on the overall performance of the engine. The design of the intake pipe based on experience is subjective and unilateral, and the design cycle and experimental period are long. Ansys Fluent software is used to simulate the design, which can more intuitively reflect the air flow condition of the intake pipe and enable selection of the best layout. First of all, a three-dimensional model of the intake pipe is simulated and the airflow characteristics are studied and analyzed. The streamline diagram and velocity contour under various conditions are obtained. Then, compared with the simulation results, the position of the intake pipe is optimized. Finally, the optimized intake pipe is simulated and verified. According to the experimental results, the intake performance of the optimized intake pipe is greatly improved.

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Experimental study and numerical simulation on in-cylinder flow of small motorcycle engine

Cited by 12 publications

References 31 publications

Experimental and Numerical Study on the Dynamic and Flow Characteristics of a Reciprocating Pump Valve

Experimental and Numerical Study on the Dynamic and Flow Characteristics of a Reciprocating Pump Valve

Investigation of Flow Fields Emanating from Two Parallel Inlet Valves Using LES, PIV, and POD

Structural optimization on the design of an automobile engine intake pipe

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