An Experimental and Numerical Study of the Steady-State Flow of a SI-Engine Intake Port

Bensler, Henry; Freek, C.; Beesten, B.M.J.; Ritter, A. H.; Hentschel, A. W.

doi:10.4271/982470

Cited by 6 publications

(1 citation statement)

References 6 publications

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“…Previous investigations have provided noteworthy flow measurements that have resolved global flow parameters (swirl-or tumble ratio (Fitzgeorge and Allison 1962)), evaluated local inlet flow details with respect to inlet port geometries and fixed valve positions (Bicen et al 1985;Khalighi et al 1986;El Tahry et al 1987;Tindal et al 1988;Cheung et al 1990;Chen et al 1995;Mahmood et al 1996;Pajković and Petrović 2008), influence on the resulting in-cylinder flow (Cheung et al 1990;Chen et al 1995;Mahmood et al 1996;Bensler et al 1998;Nadarajah et al 1998;Fan et al 1999), as well as identify potential causes for cyclic variability (Justham et al 2006). Such measurements reveal that the inlet flow is highly dependent on the inlet and in-cylinder geometry, but have also revealed inlet flow orientations that can enhance the tumble or swirl motion.…”

Section: Introductionmentioning

confidence: 99%

Volumetric intake flow measurements of an IC engine using magnetic resonance velocimetry

et al. 2014

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Magnetic resonance velocimetry (MRV) measurements are performed in a 1:1 scale model of a singlecylinder optical engine to investigate the volumetric flow within the intake and cylinder geometry during flow induction. The model is a steady flow water analogue of the optical IC-engine with a fixed valve lift of 9:21 mm to simulate the induction flow at crank-angle 270 bTDC. This setup resembles a steady flow engine test bench configuration. MRV measurements are validated with phaseaveraged particle image velocimetry (PIV) measurements performed within the symmetry plane of the optical engine. Differences in experimental operating parameters between MRV and PIV measurements are well addressed. Comparison of MRV and PIV measurements is demonstrated using normalized mean velocity component profiles and showed excellent agreement in the upper portion of the cylinder chamber (i.e., y ! À 20 mm). MRV measurements are further used to analyze the ensemble average volumetric flow within the 3D engine domain. Measurements are used to describe the 3D overflow and underflow behavior as the annular flow enters the cylinder chamber. Flow features such as the annular jet-like flows extending into the cylinder, their influence on large-scale in-cylinder flow motion, as well as flow recirculation zones are identified in 3D space. Inlet flow velocities are analyzed around the entire valve curtain perimeter to quantify percent mass flow rate entering the cylinder. Recirculation zones associated with the underflow are shown to reduce local mass flow rates up to 50 %. Recirculation zones are further analyzed in 3D space within the intake manifold and cylinder chamber. It is suggested that such recirculation zones can have large implications on cylinder charge filling and variations of the in-cylinder flow pattern. MRV is revealed to be an important diagnostic tool used to understand the volumetric induction flow within engine geometries and is potentially suited to evaluate flow changes due to intake geometry modifications.

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Section: Introductionmentioning

confidence: 99%

Volumetric intake flow measurements of an IC engine using magnetic resonance velocimetry

et al. 2014

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An experimental investigation of two different methods for swirl induction in a multivalve engine

Pipitone

Mancuso

2005

International Journal of Engine Research

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This paper describes an experimental investigation aimed at comparing the swirl effect induced by unbalancing the mass flow through the two intake ports of a multivalve engine head using two different methods: the first one reduced the curtain area of one of the intake valves [different lifts (DL) method]; the second one adopted a sluice-gate-shaped valve, installed upstream of the intake valves [swirl control valve (SCV) method] in order to cause a pressure drop. A steady-flow test rig (equipped with instrumentation for the discharge coefficient and swirl intensity measurement) was realized in order to compare and evaluate the results of both methods and determine their respective validity and limitations; the procedures used for both experimental methods are discussed in detail. The flow characteristics were analysed through changes of lift difference or SCV position; it was found that both DL and SCV methods are effective in swirl induction but the DL mechanism, acting on the valve curtain area, is more effective in flow unbalancing between intake ports, since the flowrate depends linearly on the curtain area. The SCV method, instead, controls the port flowrate, inducing a localized pressure drop, whose intensity depends on the flow velocity in a non-linear manner. For this reason the SCV method can achieve strong swirl intensity only with high obstruction levels, in a narrow regulation window close to full-obstruction conditions.

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Some Critical Technical Issues on the Steady Flow Testing of Cylinder Heads

Xu¹

2001

SAE Technical Paper Series

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An Experimental and Numerical Study of the Steady-State Flow of a SI-Engine Intake Port

Cited by 6 publications

References 6 publications

Volumetric intake flow measurements of an IC engine using magnetic resonance velocimetry

Volumetric intake flow measurements of an IC engine using magnetic resonance velocimetry

An experimental investigation of two different methods for swirl induction in a multivalve engine

Some Critical Technical Issues on the Steady Flow Testing of Cylinder Heads

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