The effect of density ratio on the near field of a naturally occurring oscillating jet

England, G.; Kalt, P.; Nathan, Graham J.; Kelso, Richard

doi:10.1007/s00348-009-0706-6

Cited by 7 publications

(15 citation statements)

References 18 publications

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“…In this section, we first verify the LES predictions using limited experimental data from England et al [9] and then characterize respectively the mean and instantaneous OTJ flow fields produced by the LES modeling.…”

Section: Resultsmentioning

confidence: 97%

“…The SIMPLEC method was employed for the pressure-velocity coupling. Figure 1 shows a schematic diagram of the OTJ nozzle used in present study and also by England et al [9]. It comprises a circular chamber of diameter D = 26.5 mm and length L = 2.5D with an equally triangular inlet of equivalent diameter d e1 = D/3.5 and chamber exit diameter d 2 = 0.82D.…”

Section: Computational Detailsmentioning

confidence: 98%

“…To mimic the experimental case of England et al [9], the velocity profile of a fully developed turbulent pipe flow was given upstream from the inlet at x = −L o . That is, the velocity profile was determined by the empirical 1/7th power-law, i.e.,…”

Section: Computational Detailsmentioning

confidence: 99%

“…To our best knowledge, this is the first study of the OTJ flow by LES. Following the experimental investigations by England et al [9] on the OTJ flow, the present study is aimed at examining both the mean and instantaneous OTJ flow structures mainly inside the chamber under the same initial and boundary conditions. The simulation was performed for Re 1 = 17,900, the same Reynolds number as for the flow of England et al [9], where Re 1 ≡ U 1 d e1 /v with U 1 being the mass-averaged velocity at the orifice-inlet, d e1 the orifice equivalent diameter and v the kinematic viscosity of the fluid.…”

Section: Introductionmentioning

confidence: 99%

“…A designer therefore has the flexibility not only to accommodate a much lower supply pressure but also to choose the jet spreading angle. England et al [9] investigated the effect of the density ratio of the OTJ fluid to ambient fluid on the resulting OTJ flow downstream from the nozzle. The initial spread and decay of the emerging jet were found to depend upon the density ratio while the dominant oscillation frequency decreases with increasing the density ratio.…”

Section: Introductionmentioning

confidence: 99%

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Large Eddy Simulation of an Initially-Confined Triangular Oscillating Jet

2011

Flow Turbulence Combust

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This paper reports the first large eddy simulation (LES) of a self-excited oscillating triangular jet (OTJ) issuing from a fluidic nozzle that consists of a small triangular orifice inlet followed by a large circular chamber and an orifice outlet. The case simulated is identical to that measured experimentally by England et al. (Exp Fluids 48 (1):69-80, 2010). The present prediction agrees well with the previous measurement. The simulation reveals that the central oscillating jet exhibits axisswitching in the cross-section and rotates by 60 • approximately over a downstream distance of x = 0.5D (chamber diameter). Three strong longitudinal vortices occur associated with the three vertices of the inlet triangle. These vortices strongly interact with the central jet and also the surroundings, in the region at x/D ≤ 1, and appear to merge finally with the outer secondary swirling flow. These observations are consistent with the deduction from previous experiments.

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Section: Resultsmentioning

confidence: 97%

Section: Computational Detailsmentioning

confidence: 98%

Section: Computational Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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