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Evaluation of spray-induced turbulence during the induction stroke of a four-stroke single-cylinder optical engine
| Content Provider | Semantic Scholar |
|---|---|
| Author | Peterson, Brian Baum, Elias Ding, Carl-Philipp Michaelis, Dirk Dreizler, A. Böhm, Benjamin |
| Copyright Year | 2016 |
| Abstract | Spray-induced turbulence proceeding injection augments mixing, thus playing an important role in engine performance and stability, while also important for controlling pollutant formation. This work presents an application of tomographic PIV (TPIV) to resolve the 3-dimensional, 3-component (3D3C) spray-induced turbulent flow within a spray-guided direct-injection spark-ignition (SG-DISI) optical engine. TPIV measurements were obtained after a single-injection from a hollow-cone spray when particle densities were suited for accurate TPIV particle reconstruction. The injection strategy resembled the first-injection from a multi-injection strategy. Highspeed PIV (HS-PIV) measurements (4.8 kHz) were combined with phase-locked TPIV measurements (3.3 Hz) to provide the time-history of the 2D2C flow preceding TPIV imaging. HS-PIV is also used to validate TPIV measurements within the z = 0mm plane. TPIV uncertainties of 12% are assessed for non-injection operation. TPIV was used to spatially resolve spray-induced turbulent kinetic energy (TKE), shear (S), and vorticity (Ω) distributions. The added 3D3C velocity information is capable of resolving 3D shear layers that produce spatiallycoherent 3D turbulent vortical structures, which are anticipated to augment fuel-air mixing. Measurements spatially quantify the increase of these parameters from injection and quantity distributions revealed significant differences to non-injection operation. The isosurface density <ρ>, defined as the volume percentage for which a flow parameter exceeds a given value, identified distributions of the largest TKE, S, and Ω magnitudes, which indicated the highest turbulence levels. Distributions quantify the increase of TKE, S, and Ω from injection and describe the decay of spray-induced turbulence with time. At <ρ> values below 10%, fuel injection increases TKE, S, and Ω magnitudes up to 70% compared to the engine flow without injection. Measurements and analyses provide insight into spray-induced turbulence phenomena and are anticipated to support predictive model development for engine |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/finalworks2016/papers/04.1_3_55paper.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
