Flow Field Analysis of Jet Impinging on an Inclined Flat Plate at High Plate Angles

Ito, Masato; Oyama, Akira; Fujii, Kozo; Hayashi, Koichi

doi:10.2514/6.2006-1047

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…9 from Ref. [18], which shows how the large, sharp peak for nozzle positions close to the target rapidly becomes more diffuse at larger L/Ds, with a smaller peak remaining on the right only because that side is much closer to the nozzle lip. The first row of Fig.…”

Section: Exitmentioning

confidence: 81%

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Analysis Methods for High Energy Line Break Jet Flows in Nuclear Power Plants

Charrouf

Kauffman

Yoon

et al. 2020

Journal of Nuclear Engineering and Radiation Science

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The effects of postulated accidents, including dynamic effects of pipe ruptures, must be analyzed for licensing of nuclear power plants (NPPs). Applicants and licensees of NPPs have struggled to address U.S. Nuclear Regulatory Commission (NRC) expectations to assess if high energy line break (HELB) jet impingement on structures and components can lead to dynamic amplification, and to accurately simulate blast wave-induced loadings. In this paper, evaluation of the potential for load amplification and occurrence of resonance conclusively demonstrates that the phenomenon does not occur. In a HELB, several physical parameters of jets issuing from a ruptured pipe - such as non-equilibrium condensation of steam, unsteady separation between the jet exit and target, non-orthogonal alignment of jet axis to impingement surface, uneven impingement surfaces, or mismatch of jet excitation frequency and target natural frequency - prevent occurrence of the phase lock conditions needed to initiate and maintain a resonance. The analytical approach to evaluate the blast wave-induced loading applied a pressure vessel burst (PVB) correlation instead of performing time consuming CFD analysis for all break locations. Three dimensional CFD analysis of blast wave transient propagation provided the basis to develop benchmarking factors for use with the PVB correlation. The simplified methodology utilizes shockwave reflection, shape, and environment factors for application to impacted targets, which significantly reduces the amount of time to evaluate all break locations. The modified PVB method is also more appropriate than an explosion-type correlation to model the blast wave pressures from steam pipe breaks.

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Section: Exitmentioning

confidence: 81%

“…This causes excitation that is out of phase, which prevents synchronization. Experimental and simulation work involving gas jet impingement on inclined target plates reported in various papers [18,19] shows that the radial pressure distribution is skewed. This is shown conceptually in Fig.…”

Section: Exitmentioning

confidence: 99%

Analysis Methods for High Energy Line Break Jet Flows in Nuclear Power Plants

Charrouf

Kauffman

Yoon

et al. 2020

Journal of Nuclear Engineering and Radiation Science

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“…They determined that two types of acoustic waves were generated in this impingement region, with propagation directions of 30 and 75 from the plane of the plate. Ito et al 14 classified a particular jet impingement flow as "Type 1 with Bubble", which occurs when the plate angle is greater than 50 and x p D À1 is approximately 0.5-1.5. Krothapalli et al 15 investigated the role that large-scale structures and the feedback mechanism play in a loss of lift phenomena, which may occur for vertical take-off and landing aircraft near the ground.…”

Section: Experimental Researchmentioning

confidence: 99%

“…Ito et al. 14 classified a particular jet impingement flow as “Type 1 with Bubble”, which occurs when the plate angle is greater than 50º and xpD−1 is approximately 0.5–1.5. Krothapalli et al.…”

Section: Experimental Researchmentioning

confidence: 99%

Theoretical investigation of alteration and radiation of large-scale structures due to jet impingement

Miller

Carr

2018

International Journal of Aeroacoustics

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Jet flows impinge on launch pad structures and aircraft carrier deck blast deflectors. Turbulent structures are deformed and acoustic radiation is reflected by the deflector. The coupling of reflected acoustic waves with the instability waves of the jet turbulence increases their amplitude and causes a feedback loop. Resultant far-field acoustic radiation is amplified. This amplification results in additional tones with significant spectral broadening occurring at frequencies corresponding to the constructive interference. We present a simple prediction methodology in the form of an acoustic analogy. The analogy accounts for reflected acoustic waves through a tailored Green's function and models the large-scale structures as spatially and temporarily growing and decaying instability waves. The predictions are compared with two experimental datasets. Predictions compare favorably with measured frequencies and spectral broadening in the far-field.

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“…Heat transfer for a pair of rectangular jets impinging upon inclined surface was studied by Patel and Roy, (2002) [20]. Flow field analysis of jet impinging on an inclined flat plate at high angles was investigated by Ito,et al(2006) [11].…”

mentioning

confidence: 99%

Study of Air Jet Impinging on Curved Surfaces

Abou-Taleb

Abdel-Fattah

Moustafa

2008

ERJ. Engineering Research Journal

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This study reports experimental and numerical results exposing the effect of the impingement surface geometry on the flow field for impinging low and high speed jets. Air jets from convergent circular nozzle of 10 mm exit diameter have been allowed to impinge normally on a flat plate, hemispherical, and conical surfaces. Experiments were done with varying the stagnation pressure from 1.2 to 2 bar. The Reynolds number based on the nozzle exit diameter for this range of stagnation pressure was changed from 7.5 x 10 5 to 3 x 10 6. The distance between the nozzle exit plane and the test surface was varied from 10 to 80 cm. Measurements of static and total pressure were made by the help of pressure taps made on the test surfaces and a pitot tube. The numerical simulations were performed by the solution of Navier-Stokes equations with a k-ε model. Behaviors of the impinging jets were compared with those of a free jet. The flow field was found to be depend on the stagnation pressure, spacing between the nozzle and impinging surface, as well as the impinging surface geometry. A comparison of the predicted behavior of the jet with those obtained from experimental results gives a good agreement.

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Flow Field Analysis of Jet Impinging on an Inclined Flat Plate at High Plate Angles

Cited by 6 publications

References 7 publications

Analysis Methods for High Energy Line Break Jet Flows in Nuclear Power Plants

Analysis Methods for High Energy Line Break Jet Flows in Nuclear Power Plants

Theoretical investigation of alteration and radiation of large-scale structures due to jet impingement

Study of Air Jet Impinging on Curved Surfaces

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