Experimental investigations of an underexpanded jet from a convergent nozzle impinging on a cavity

Sobieraj, G.; Szumowski, A. P.

doi:10.1016/0022-460x(91)90443-n

Cited by 26 publications

(19 citation statements)

References 15 publications

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“…The calculated dependence of the Strouhal number Sh of the self-oscillations in the Hartmann resonator on its depth h is plotted in Figure 15 as curve a ; the calculations were performed at N = 2 and 2.64. In this figure curves a3 and a4 indicate the boundaries of the scatter in the experimental data obtained in studies 16,46–51 and in the experiments of Hartmann himself. 11 These data were obtained for different values of the control parameters N and l; the ranges of their variation are given in Table 1.…”

Section: Interaction With a Cavitymentioning

confidence: 98%

“…Dependence of the self-oscillation Strouhal number on the nozzle/tube spacing l at h = 12.5 and N = 2.64; (1), our calculations and (2), experimental data. 46 …”

Section: Interaction With a Cavitymentioning

confidence: 99%

“…In this case, the self-oscillations are observable on the 3 ≤ l ≤ 6.6 range. In Figure 14 the experimental data on the fluctuation frequency obtained in Sobieraj and Szumowski 46 are also presented. The calculated and measured results are in good agreement, although in the experiment the range of self-oscillations is somewhat longer than in the calculations (up to l = 8.2).…”

Section: Interaction With a Cavitymentioning

confidence: 99%

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Self-oscillatory flow in the Hartmann resonator – Numerical simulation

Lebedev

Bocharova

2020

International Journal of Aeroacoustics

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Self-oscillatory flow in the Hartmann resonator is numerically calculated within the framework of ideal (inviscid and non-heat-conducting) gasdynamics. The calculations are performed for the case of a sonic jet impinging on a tube varying from that with a sealed inlet (rod) to a fairly deep cavity. The spacing between the tube and the nozzle and the nozzle pressure ratio are also varied in the calculations. On the basis of the calculated results the oscillation process is described in detail and its mechanism is revealed for both shallow and deep tubes. For shallow tubes and a rod it is due to an imbalance in the flow rate and momentum between two regions in the jet that impinges on the obstacle. For deep tubes the oscillations are due to the tube filling and evacuation somewhat reminiscent of the process occurring in a one-quarter-wave resonator. In any case no signature of a feedback loop in the external acoustic field of the jet was detected. The results of the calculations are in good agreement with experimental data. The effects of mounting a lip on the tube (transition from a low- to high-frequency operation mode) and heating in the Hartmann tube are also discussed.

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Section: Interaction With a Cavitymentioning

confidence: 98%

“…Dependence of the self-oscillation Strouhal number on the nozzle/tube spacing l at h = 12.5 and N = 2.64; (1), our calculations and (2), experimental data. 46 …”

Section: Interaction With a Cavitymentioning

confidence: 99%

Section: Interaction With a Cavitymentioning

confidence: 99%

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Self-oscillatory flow in the Hartmann resonator – Numerical simulation

Lebedev

Bocharova

2020

International Journal of Aeroacoustics

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“…Stand-off distance and nozzle pressure ratio was found to be the governing parameters in determining the location, strength, and frequency of the oscillating shock. Sobeiraj and Szumowsky [5] observed that while the shape of the cavity edge considerably affects the acoustical phenomena and oscillatory modes (switching between screech and regurgitant), the shape of the nozzle edge is insignificant. The frequency corresponding to the screech mode is also seen to be higher than that for the regurgitant mode in the range 2 < R < 3.5.…”

Section: Literature Reviewmentioning

confidence: 98%

Studies on conical and cylindrical resonators

et al. 2008

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“…Iwamato 12) could identify the necessary conditions for starting and maintaining the flow oscillations associated with JRM: a positive pressure gradient in front of the resonator and a low-pressure area near the cavity inlet edge. This can explain why neither the shape of the nozzle, nor the internal cavity geometry are relevant for achieving resonance 13) , while the geometry of the cavity inlet edge considerably affects oscillations 14) .…”

Section: Fundamental Hs Tube Flow Phenomenamentioning

confidence: 99%

Investigation of Stabilization Effects in Hartmann-Sprenger Tubes

Bauer

Hauser

Haidn

2016

AEROSPACE TECHNOLOGY JAPAN

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An experimental investigation has been conducted in order to evaluate whether it is possible to reduce the sensitivity of the heating effect observed in Hartmann-Sprenger Tubes by applying swirl to the nozzle flow. A reference configuration derived from literature is compared against modified cavities incorporating stems of various lengths and a setup utilizing swirl. A stem of ≈50% cavity length has been found to have a moderate effect on operating mode stability and heating effects. Subjecting a cylindrical resonator to swirling flow has demonstrated to considerably increase the amplitude of the flow oscillations, leading to detrimental effects on heating rate due to increased mass transfer from cavity to environment. The swirl configuration therefore shows potential for improving resonators used for active flow control and Hartmann-Sprenger tubes designed for larger pressure amplitudes.

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Experimental investigations of an underexpanded jet from a convergent nozzle impinging on a cavity

Cited by 26 publications

References 15 publications

Self-oscillatory flow in the Hartmann resonator – Numerical simulation

Self-oscillatory flow in the Hartmann resonator – Numerical simulation

Studies on conical and cylindrical resonators

Investigation of Stabilization Effects in Hartmann-Sprenger Tubes

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