The effects of swirl and tumble on combustion in spark-ignition engines

Hill, Philip G.; Zhang, D.

doi:10.1016/0360-1285(94)90010-8

Cited by 124 publications

(46 citation statements)

References 98 publications

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“…The flow circulation about the cylinder axis can be described as a swirl ratio and the perpendicular flow circulation around the axis can be denoted as a tumble ratio which is mainly orthogonal to swirl flow [166,167]. Kook et al [168] experimentally diagnosed the effect of swirl ratio and fuel injection pressure on CO emission of an optical engine under LTC.…”

Section: Swirl/tumble Ratio Injection Pressure and In-cylinder Turbumentioning

confidence: 99%

Recent development of biodiesel combustion strategies and modelling for compression ignition engines

Azad

Rasul

Khan

et al. 2016

Renewable and Sustainable Energy Reviews

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Section: Swirl/tumble Ratio Injection Pressure and In-cylinder Turbumentioning

confidence: 99%

Recent development of biodiesel combustion strategies and modelling for compression ignition engines

Azad

Rasul

Khan

et al. 2016

Renewable and Sustainable Energy Reviews

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“…Because the two motions have different characteristics and they interact differently with the piston motion, is has been concluded that an optimum rotating flow field may create through combination of the two kinds of rotational motion. In their paper the authors have reviewed the principal features of the mean velocity and turbulence fields associated with these rotational motions, the mechanisms for decay, generation, transport and enhancement of in-cylinder turbulence [4].…”

Section: Introductionmentioning

confidence: 99%

Influence of swirl and tumble motion inside the combustion chamber of a compression ignited engine on vertices formation

2018

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Abstract. In modern compression ignited engines, one of the key innovative directions is optimization of the burn process especially to reduce emissions. This optimization can be done by ensuring a better air-fuel mixture. To answer this problem, in the current paper, the authors analysed the vertices formation and velocity inside the combustion chamber in thirteen cases, by using numerical analysis (AVL FIRE Software), to generate pure tumble motion, pure swirl motion, no in-cylinder motion of the air, and other combinations on tumble and swirl motion. The cases that were chosen combine 0%, 50%, 70% and 100% tumble and swirl motion. The greatest velocity of the in-cylinder air motion was noted when a 100%tumble and 50% swirl motion was induced (77.2 m/s at 736 degrees CA), while the smallest velocity was noted at 100% swirl and 0% tumble (71.07 m/s at 736 degrees CA). Because of the different induced motions, the vertices that form inside the combustion chamber have a great influence on air-fuel mixture and implicitly on emissions.

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“…On the other hand, the flow with an axis perpendicular to that of the cylinder axis is denoted as tumble and is typically targeted in pent-roof, four-valve spark ignition engines [17]. These coherent structures, either swirl or tumble, are reliant on the particulars of the bore/stroke ratio, the intake the valve geometry, the inlet port profile, and the shape of the combustion chamber [18,19]. It is well known that one of the major issues with GDI engines is their ability to maintain stable mixture stratification.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Inlet Port Flow under Steady-State Conditions Using PIV and POD

et al. 2017

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Abstract:The current study demonstrates an experimental investigation of the tumble flow structures using Particle Image Velocimetry (PIV) under steady-state conditions considering the central vertical tumble plane. The experiments were carried out on a four-valve, pent-roof Gasoline Direct Injection (GDI) engine head at different valve lifts and with a pressure difference of 150 mmH 2 O across the intake valves. Furthermore, the Proper Orthogonal Decomposition (POD) analytical technique was applied to PIV-measured velocity vector maps to characterize the flow structures at various valve lifts, and hence the different rig tumble values. The results show that at low valve lifts (1 to 5 mm), 48.9 to 46.6% of the flow energy is concentrated in the large (mode 1) eddies with only 8.4 to 11.46% in mode 2 and 7.2 to 7.5 in mode 3. At high valve lifts, it can be clearly seen that some of the energy in the large eddies of mode 1 is transferred to the smaller flow structures of modes 2 and 3. This can be clearly seen at valve lift 10 mm where the values of the flow energy were 40.6%, 17.3%, and 8.0% for modes 1, 2, and 3, respectively.

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The effects of swirl and tumble on combustion in spark-ignition engines

Cited by 124 publications

References 98 publications

Recent development of biodiesel combustion strategies and modelling for compression ignition engines

Recent development of biodiesel combustion strategies and modelling for compression ignition engines

Influence of swirl and tumble motion inside the combustion chamber of a compression ignited engine on vertices formation

Characterization of the Inlet Port Flow under Steady-State Conditions Using PIV and POD

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