Analysis of Transient Compressible Gas Jets Using High Speed Schlieren Imaging

Johansen, Lars Christian Riis; Sienes, Eugenio de Benito; Dahlander, Petter

doi:10.4271/2013-01-0871

Cited by 11 publications

(3 citation statements)

References 14 publications

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“…Also, their model results were compared to experimental data. Furthermore, gas injection experiments have been conducted by many researchers [16][17][18][19]. Visualization of gaseous fuel injection can be performed using a laser system because gas injection is invisible to the naked eye.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of gaseous fuel injection for CNG direct injection

Choi

Lee

Park

2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of gaseous fuel injection for CNG direct injection

Choi

Lee

Park

2015

Fuel

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“…Studies on various aspects of gas and liquid sprays are abundant. A pertinent example is the study of a helium spray in an air chamber (Johansen et al [39]). Schlieren visualization was used to help investigate the mean coefficient of variation of the penetration length, jet width, and jet angle.…”

Section: Round Turbulent Jetsmentioning

confidence: 99%

Rapid compression machine study of a premixed, variable inlet density and flow rate, confined turbulent jet

Gholamisheeri

Thelen

Gentz

et al. 2016

Combustion and Flame

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The behavior of transient, compressible and combusting pre-mixed methane-air jets was experimentally studied with high speed imaging in a rapid compression machine. The jets were generated with a turbulent jet ignition system, which is a prechamber initiated combustion system. The absence of physical analyses of the characteristics of premixed turbulent jets was the motivation for the present study. Experiments were completed for turbulent jet ignition system orifice diameters of 2.0, 2.5 and 3.0 mm each at lean-to-stoichiometric equivalence ratios of φ=0.67, 0.8 and 1.0. The hot jet velocity at the orifice exit was calculated using mathematical correlations. The Mach number and Reynolds number were also computed. The high speed imaging shows the influence of orifice diameter on the flame propagation and the shape and structure of vortices resulting from the turbulent jet. Results revealed a direct relationship between orifice exit area reduction and a decrease in hot jet penetration speed. There was a reduction in hot jet penetration speed with an increase in the equivalence ratio. For the orifice diameters and equivalence ratios tested here, results showed that the jet evolved downstream of the orifice exit in partial agreement with existing correlations. Moreover, the jet was turbulent with calculated Reynolds numbers of around 20,000 or greater.

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“…Directly injected hydrogen assisted CNG (called HCNG) fuel to achieve a more reliable combustion, low NO x emissions, high thermal efficiency and lower hydrocarbon (HC) emissions. By applying hydrogen assisted jet ignition, HC emissions were reduced by a further 100 ppm without increasing CO and NO x [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Study on Performance and Exhaust Gas Characteristics of Directly Injected CNG Engine

Lee

Baik

Rogers

et al. 2014

IJBSBT

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There are two types of fuel supply method in CNG vehicles. One is premixed ignition and the other is gas-jet ignition. In premixed ignition, the fuel is introduced with intake air so that homogeneous air-fuel mixture may form. The ignitability of this method depends on the global equivalence ratio. In gas-jet ignition, CNG is introduced directly into the engine combustion chamber. The overall mixture is stratified by retarded fuel injection. In this study, a visualization technique was employed to obtain fundamental properties regarding overall mixture formation and combustion characteristics of direct injected CNG fuel inside a constant volume chamber and engine. For gas-jet visualization, Schlieren high speed imaging is used with the effects of ambient pressure and impingement wall on mixture formation being investigated.

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Analysis of Transient Compressible Gas Jets Using High Speed Schlieren Imaging

Cited by 11 publications

References 14 publications

Numerical and experimental study of gaseous fuel injection for CNG direct injection

Numerical and experimental study of gaseous fuel injection for CNG direct injection

Rapid compression machine study of a premixed, variable inlet density and flow rate, confined turbulent jet

Study on Performance and Exhaust Gas Characteristics of Directly Injected CNG Engine

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