Outwash Measurements of a Dual Impinging Jet Scale Model

Myers, Leighton M.; McLaughlin, Dennis K.

doi:10.2514/6.2015-1937

Cited by 7 publications

(4 citation statements)

References 10 publications

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“…Pitot rake measurements in the outwash flow were previously reported by Myers and McLaughlin. 50 The exact radial position of Pitot rake measurements is indicated on each graph in red, italicized font. There is excellent agreement between the LDV and Pitot probe measurements in the outwash region, particularly above y=D r ¼ 0:5.…”

Section: Mean Velocity and Turbulence Measurements In Impinging Jet Omentioning

confidence: 99%

“…As such, the Pitot probes may not be able to accurately resolve the peak velocity in a wall jet of this scale. It is important to note that the authors of Myers and McLaughlin 50 believe the impinging jet apparatus may not have been oriented perfectly vertical at the time Pitot rake measurements were taken. This would introduce angularity in the resulting outwash flow such that there would be a non-negligible velocity component tangential to the Pitot rake that could not be measured.…”

Section: Mean Velocity and Turbulence Measurements In Impinging Jet Omentioning

confidence: 99%

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Unsteady velocity measurements of model-scale supersonic exhaust jets in military-relevant configurations

Hromisin

Powers

Myers

2018

International Journal of Aeroacoustics

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Of the utmost importance is the need to better understand the high temperature, high velocity flow fields generated by military tactical aircraft during ''run up'' and takeoff that gives rise to extremely hazardous conditions for personnel and equipment within the vicinity of the aircraft. The present study aims to fill the need for high frequency, two velocity component measurements throughout the flow fields produced by university-scale supersonic jets exhausting from nozzles in configurations relevant to practical, full-scale application. Specifically, this work focuses on studying the supersonic jets operating in two basic configurations: horizontal, free jets and jets impinging normal to a ground plane reminiscent of current short-takeoff and vertical landing aircraft. Experiments are conducted at nozzle operating conditions similar to those of full-scale aircraft. Both mean velocities and turbulence components are measured in both flow fields using a laser Doppler velocimeter. Axial components of the mean flow and turbulence are measured in the free jet. In the single impinging jet flow field two-component mean velocity and turbulence components are measured in the jet plume, impingement region, and outwash flow. Free jet velocity measurements show good consistency with 50% increase in jet Reynolds number. Turbulence intensities up to 15% of the mean jet exit velocity are observed at the nozzle exit plane. Laser Doppler measurements in the outwash of an impinging jet show turbulent fluctuations produce unsteady velocities well above the mean value. Two-component impinging jet unsteady velocity spectra show a distinct peak at the same frequency as the impingement tone observed in prior impinging jet acoustic field measurements.

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Section: Mean Velocity and Turbulence Measurements In Impinging Jet Omentioning

confidence: 99%

Section: Mean Velocity and Turbulence Measurements In Impinging Jet Omentioning

confidence: 99%

Unsteady velocity measurements of model-scale supersonic exhaust jets in military-relevant configurations

Hromisin

Powers

Myers

2018

International Journal of Aeroacoustics

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“…Consequently, model scale impinging jets have presented a practical means of studying the fundamental physics, and have been a focus of research for over four decades 9 . A few notable experimental studies include the works of Krothapalli et al 2,10 and Kumar et al 3 , which were mentioned previously; as well as Saddington et al 11 , who considered the effect splayed jets have on vertical landing and fountain flow; and the works of Myers et al 12 , who studied dual model scale jets, which will be further investigated in this paper. Additionally, Alvi et al 4 , noted that it is possible to gain further insight into the complex physics involved in jet impingement through computational modeling, and used Computational Fluid Dynamics (CFD) Reynolds-averaged Navier-Stokes (RANS) models to repeat the experimental investigations of Krothapalli et al 2,10 .…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the experimental model of Myers et al 12 will be investigated computationally using both RANS and DDES models. In order to gain a further perspective on the impact several parameters have on the adverse jet impingement effects, a simple reduced-order model (ROM) based on CFD will be developed.…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis, Model Reduction, and Experimental Comparison of Model Scale Impinging Jets

Crowell

Myers

2016

54th AIAA Aerospace Sciences Meeting

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Computational fluid dynamics models and corresponding reduced-order models are compared with the results of a recent set of experiments on dual model scale impinging jets conducted at the Pennsylvania State University high speed jet aeroacoustics facility. Two studies are conducted comparing CFD and experiment: (1) supersonic jet plume analysis and (2) comparison of the pressure distributions on the underside of a lift plate as a function of nozzle pressure ratio and height above the ground. Results generally show good agreement between CFD and the experiment. However, there is clear room for improvement with CFD, specifically related to over predicting the strength of the pressure differential due to fountain flow impingement on the underside of the lift plate. Additionally, reduced-order modeling techniques are applied to CFD solutions in order to conduct a large scale parametric study. This study revealed the effect various parameters have on specific outputs of interest, including: suckdown force, peak heat flux, outwash velocity, and several others. A computational cost analysis demonstrates the parametric study would have been impractical without the reduced-order modeling effort.

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Unsteady Velocity Measurements of Model-Scale Supersonic Exhaust Jets in Military-Relevant Configurations

Hromisin

Powers

Myers

et al. 2016

34th AIAA Applied Aerodynamics Conference

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Outwash Measurements of a Dual Impinging Jet Scale Model

Cited by 7 publications

References 10 publications

Unsteady velocity measurements of model-scale supersonic exhaust jets in military-relevant configurations

Unsteady velocity measurements of model-scale supersonic exhaust jets in military-relevant configurations

Computational Analysis, Model Reduction, and Experimental Comparison of Model Scale Impinging Jets

Unsteady Velocity Measurements of Model-Scale Supersonic Exhaust Jets in Military-Relevant Configurations

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