Study on the flow field and concentration characteristics of the multiple tandem jets in crossflow

Li, Zhiwei; Huai, Wenxin; Zhou, Qian

doi:10.1007/s11431-012-4964-9

Cited by 41 publications

(12 citation statements)

References 15 publications

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“…It is found that the length scale l mb can accurately represent the influence of both R jc and R wc on the trajectories. Using the least-square fitting method, the equation for the trajectories of twin buoyant jets in the wave and current environment is expressed as: z l mb = 4.40 x l mb 0.46 (15) and it is illustrated in Figure 12…”

Section: Empirical Formula Of Trajectorymentioning

confidence: 99%

“…As for the multiple jets, the penetration of leading jet in the cross-flow was found to be comparable to that of the single jet in the near field [13], indicating that it is independent of the sequential rear jets. The leading jet has a sheltering effect on the rear jets, which leads to a smaller bending degree and a deeper penetration for these rear jets [14,15]. The shielding effect of the leading jet will decline with the increase of adjacent jet spacing [15].…”

Section: Introductionmentioning

confidence: 99%

“…The leading jet has a sheltering effect on the rear jets, which leads to a smaller bending degree and a deeper penetration for these rear jets [14,15]. The shielding effect of the leading jet will decline with the increase of adjacent jet spacing [15]. The trajectory of rear jet was found to be influenced by the leading jet as it restricts the cross-flow, and the trajectories of all the jets, downstream of the leading jet, are found to be similar [16].…”

Section: Introductionmentioning

confidence: 99%

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2D PIV Measurement of Twin Buoyant Jets in Wavy Cross-Flow Environment

Otoo

Chen

et al. 2019

Water

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The multiport diffuser effluent discharge facilities constructed beneath the coastal waters were simplified in the laboratory as twin buoyant jets in a wavy cross-flow environment. The near-field flow structure of twin jets was studied by series of experiments conducted in a physical wave–current flume. The particle image velocimetry (PIV) system was used to measure the velocity field of the jets in various cross-flow-only and wavy cross-flow environments. By means of flow visualization, the distinctive “effluent cloud” (EC) phenomenon was clearly observed and the jet penetration height was found to be notably increased compared with that of cross-flow-only environment at the downstream position. It was found that the wave-to-current velocity ratio Rwc is a very important parameter for effluent discharge. A new characteristic velocity uch and the corresponding characteristic length scale lmb for twin buoyant jets in the wavy cross-flow environment were defined. Using curve-fitting, a new equation to estimate the effects of the jet-to-current velocity ratio (Rjc), wave-to-current velocity ratio (Rwc) and Strouhal number (St) on the jet trajectory were derived to enhance understanding the physical processes underpinning the rise and the dilution of buoyant jets, which is critical to the design of discharge facilities.

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Section: Empirical Formula Of Trajectorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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2D PIV Measurement of Twin Buoyant Jets in Wavy Cross-Flow Environment

Otoo

Chen

et al. 2019

Water

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“…9) (Lee, 2006a), and this is due to the strong interactions among the injection flows, various shock wave structures and vertical flows around the injection flows. An efficient injection system setup must include the selection of many parameters, i.e., the position of the injection port, the distribution of the mass flow rate and momentum flux, the injection angle, and the combination of the injection angles (Kovar and Schulein, 2006;Lee, 2006a;Li et al, 2012;Pudsey et al, 2012). Fig.…”

Section: Effect Of the Number Of Injection Portsmentioning

confidence: 99%

Progress in research on mixing techniques for transverse injection flow fields in supersonic crossflows

Huang

Yan

2013

J. Zhejiang Univ. Sci. A

110

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The transverse injection flow field has an important impact on the flowpath design of scramjet engines. At present a combination of the transverse injection scheme and any other flame holder has been widely employed in hypersonic propulsion systems to promote the mixing process between the fuel and the supersonic freestream; combustion efficiency has been improved thereby, as well as engine thrust. Research on mixing techniques for the transverse injection flow field is summarized from four aspects, namely the jet-to-crossflow pressure ratio, the geometric configuration of the injection port, the number of injection ports, and the injection angle. In conclusion, urgent investigations of mixing techniques of the transverse injection flow field are proposed, especially data mining in the quantitative analytical results for transverse injection flow field, based on results from multi-objective design optimization theory.

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“…The flow characteristics and mixing process of jets are affected by the receiving environment (e.g., still water, density stratification, and crossflow). Numerous experimental and numerical investigations have been conducted on the flow characteristics of jets, and some typical phenomena have been identified [1][2][3][4][5]. The situation in which a jet is injected horizontally to the ambient fluid in an opposite direction is called a jet in counterflow, which is found in wastewater outfalls, particularly a rosette jet group [6].…”

Section: Introductionmentioning

confidence: 99%

Verification and Validation of URANS Simulations of the Round Buoyant Jet in Counterflow

Xiao

Huai

et al. 2018

Water

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This paper presents a study on the verification and validation (V&V) of numerical solutions for round buoyant jets in counterflow. The unsteady flow was simulated using an unsteady Reynolds-averaged Navier–Stokes (URANS) solver with a two-phase mixture model. This work aimed to quantitatively investigate the reliability and applicability of various uncertainty estimators in the simulation of a buoyant jet in counterflow. Analysis of the discretization uncertainty estimation results revealed that the factor of safety (FS) and the modified FS (FS1) methods were the appropriate evaluation estimators in the simulation of a buoyant jet in counterflow. Validation by comparison with the experimental data indicated that the area without achieving the validation at the validation level was strongly related to the shear layer between the jet flow and the ambient fluid. Moreover, the predicted concentration contours, coherent structures, and centerline concentration were strongly affected by the grid resolution.

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Study on the flow field and concentration characteristics of the multiple tandem jets in crossflow

Cited by 41 publications

References 15 publications

2D PIV Measurement of Twin Buoyant Jets in Wavy Cross-Flow Environment

2D PIV Measurement of Twin Buoyant Jets in Wavy Cross-Flow Environment

Progress in research on mixing techniques for transverse injection flow fields in supersonic crossflows

Verification and Validation of URANS Simulations of the Round Buoyant Jet in Counterflow

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