Studies on scaling of flow noise received at the stagnation point of an axisymmetric body

Arakeri, V.H.; Satyanarayana, S.; Mani, Karthik V.; Sharma, S. D.

doi:10.1016/0022-460x(91)90701-k

Cited by 17 publications

(10 citation statements)

References 9 publications

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“…The results of the experimental measurement are true and reliable, but they could be affected by interference noise and be limited by experimental conditions [8]. Theoretical and experimental studies [9][10][11][12] have shown that the flow noise around the head of the axisymmetric body comes mainly from the radiated noise of the boundary layer transition region. The levels of pressure fluctuations in the transition region have been found to be significantly higher than those in the fully developed region of turbulent flow.…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, it is of great significance to study the flow noise of an axisymmetric body in a complex underwater environment. At present, there are two approaches used to research the flow noise of the axisymmetric body: experimental measurement [8][9][10][11][12] and numerical calculation [13][14][15]. The results of the experimental measurement are true and reliable, but they could be affected by interference noise and be limited by experimental conditions [8].…”

Section: Introductionmentioning

confidence: 99%

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The Flow Noise Calculation for an Axisymmetric Body in a Complex Underwater Environment

Huang

Yang

et al. 2019

JMSE

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The flow noise of a sonar platform is one of the main background interferences for sonar applications. This paper focuses on the flow noise of an axisymmetric body in a complex oceanic environment. Under the condition of a constant stream velocity which comes from the axial direction, an analytical method for computing the flow noise power spectrum in the transition region of the axisymmetric body is given in detail. The flow noise power spectrum computed by the analytical method is in agreement with the numerical simulation result. Then the flow noise physical features of the axisymmetric body in different incoming stream directions and velocity states caused by the complex oceanic environment are computed and analyzed by the numerical method. The results show that as the incoming stream direction changes, the transition region will migrate and the flow noise radiation direction of the axisymmetric body will also rotate at an angle which equals the stream direction variation. The flow noise energy generated by other directional incoming streams is slightly larger than that generated by the stream coming from an axial direction. When the incoming stream velocity is time-varying, the vorticity change on the axisymmetric body surface is obviously stronger than that under a constant stream, and the generated flow noise energy is also significantly larger. In addition, it indicates that there is a significant correlation between the intensity of flow noise energy and the magnitude of flow velocity.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

The Flow Noise Calculation for an Axisymmetric Body in a Complex Underwater Environment

Huang

Yang

et al. 2019

JMSE

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“…In addition, some scholars also conducted experiments on similarity studies of the flow-induced noise. Arakeri et al [10] found a similarity law where the flow-induced noise of the axisymmetric body was proportional to the seventh power of inflow velocity. Based on the same simplified landing gear model, Xing et al [11] obtained the sound pressure level spectrums of the flow-induced noise at different speeds and then normalized the amplitude according to the dipole characteristics and the frequency according to the Helmholtz similarity.…”

Section: Introductionmentioning

confidence: 99%

Similarity analysis of the flow-induced noise of a benchmark submarine

Yao

Zhang

et al. 2023

Front. Phys.

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As one of the three major noise sources of submarines, flow-induced noise plays a key role for the stealth capability of submarines. Several research studies based on experiment or simulation have evaluated the sound radiation from the scale model; however, it is still a great challenge to efficiently evaluate the flow-induced noise of a large-scale prototype. In order to solve this problem, the flow-induced noise of different scale submarines is analyzed, and both the similarity law and the scale effect are discussed in the dimensionless frequency St = 10–1089. The fully appended DARPA SUBOFF, a famous benchmark submarine model, is used in our research. The relationship between the sound power, scale variables, and the speed and scale variables is obtained using the Buckingham Pi theorem. Then, the sound pressure level and the sound power level of the SUBOFF, with the scale ratio of 1:24 and 1:48 and the speed of 2, 4, and 8 m/s, are calculated based on the large-eddy simulation (LES)/Lighthill hybrid method. Finally, the scale effect between a hypothetical prototype (actually, a benchmark SUBOFF model with a scale ratio of 1:8) and its scale models are discussed at the same speed. The numerical results show that the submarine’s sound power level conforms to the similarity relationship of dipole source within the cut-off frequency St = 100. The error of the sound power level is about 20 lg (φ) caused by scale effect when the dimensionless frequency is greater than the cut-off frequency, where φ is the scale ratio from the hypothetical prototype to the model. The scale error of the sound pressure level at different position and different frequency exist differently when extrapolating from model results to prototype according to the similarity law based on dipole source.

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“…Current researches on flow noises were mainly completed through experimental measurement and numerical simulation [2,3]. Martin [4] has adopted a self-propelled model experiment to obtain time-domain signals of submarine flow noises combining with an effective signal processing method.…”

Section: Introductionmentioning

confidence: 99%

Design on the fairwater shape and its influence on the radiation noise of submarines

Hua¹,

Fei²

2016

J. vibroeng.

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Firstly, a numerical computation model of submarine radiation noise was established to obtain the radiation noise of the submarine, which was compared with the experimental results, thus verifying the validity of the model. As indicated by the computational result, the submarine fairwater played a significant impact on radiation noise at the front section, whose structure was therefore necessary to be studied. In the paper, there were several different type submarine fairwaters. Large eddy simulation (LES) and boundary element method (BEM) were applied to conduct the numerical computation for the vortex flow field and acoustic characteristics of the original fairwater, the fairwater with fillet and the streamline fairwater. Furthermore, the impact and suppression effect of the fairwater's type on wall pressure fluctuations and flow-induced noise were analyzed. As shown from the research, the vertical fairwater with fillet or the streamline fairwater can significantly improve the flow quality, thus considerably reducing the pressure fluctuations and flow-induced noise. The paper is conductive to the academic research of flow noise of submarine as well as the new submarine design in the future.

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Studies on scaling of flow noise received at the stagnation point of an axisymmetric body

Cited by 17 publications

References 9 publications

The Flow Noise Calculation for an Axisymmetric Body in a Complex Underwater Environment

The Flow Noise Calculation for an Axisymmetric Body in a Complex Underwater Environment

Similarity analysis of the flow-induced noise of a benchmark submarine

Design on the fairwater shape and its influence on the radiation noise of submarines

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