Relevant bibliographies by topics / Flow-excited Helmholtz resonator

Academic literature on the topic 'Flow-excited Helmholtz resonator'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Flow-excited Helmholtz resonator"

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MA, RUOLONG, PAUL E. SLABOCH, and SCOTT C. MORRIS. "Fluid mechanics of the flow-excited Helmholtz resonator." Journal of Fluid Mechanics 623 (March 6, 2009): 1–26. http://dx.doi.org/10.1017/s0022112008003911.

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A flow-excited Helmholtz resonator was investigated experimentally and theoretically. The analysis was focused on a simplified momentum balance integrated over the region of the orifice. The resulting expressions were used to guide an experimental programme designed to obtain measurements of the resonator pressure under flow excitation, as well as the dynamics of the shear layer in the orifice using particle image velocimetry (PIV). The pressure measurements indicated a number of distinctive features as the flow speed varied. The PIV results provided a detailed representation of the shear layer vorticity field, as well as the equivalent hydrodynamic forcing of the resonator. The forcing magnitude was found to be roughly constant over a range of flow speeds. A model was proposed that provides a prediction of the resonator pressure fluctuations based on the thickness of the approach boundary layer, the free stream speed and the acoustic properties of the resonator. The model was shown to provide an accurate representation of the resonating frequency as well as the magnitude of the resonance to within a few decibels.
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Dai, Xiwen. "Vortex convection in the flow-excited Helmholtz resonator." Journal of Sound and Vibration 370 (May 2016): 82–93. http://dx.doi.org/10.1016/j.jsv.2016.01.053.

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McManus, Thomas Neil, and Assed Haddad. "Surface Air Movement: An Important Contributor to Ventilation of Isolated Subsurface Structures?" Infrastructures 4, no. 2 (May 9, 2019): 23. http://dx.doi.org/10.3390/infrastructures4020023.

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This study reports on near-surface airspeed measured using a fast-responding thermoanemometer during an investigation of ventilation of an isolated subsurface structure induced by natural forces. Air speed changes continuously, rapidly, and unpredictably when assessed on the time base of one or two seconds. Zero, the most common air speed, occurred in almost all tests throughout the year but especially during cool and cold months. The most probable non-zero air speed, 10.7 m/min (35 ft/min), occurred in all tests. This air speed is below the level of detection by the senses. The number of zero values and the height of the peak at 10.7 m/min follow a repetitive annual cycle. Isolated subsurface structures containing manhole covers share the characteristics of Helmholtz resonators. Grazing air flow across the opening to the exterior induces rotational air flow in the airspace of a Helmholtz resonator. Rotational flow in the airspace potentially influences the exchange of the confined atmosphere with the external one. Ventilation of the airspace occurs continuously and without cost and is potentially enhanced by the unique characteristics of the Helmholtz resonator excited by surface air movement. These results have immense importance and immediate applicability to worker safety.
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Ghanadi, Farzin, Maziar Arjomandi, Benjamin Cazzolato, and Anthony Zander. "Understanding of the flow behaviour on a Helmholtz resonator excited by grazing flow." International Journal of Computational Fluid Dynamics 28, no. 5 (May 28, 2014): 219–31. http://dx.doi.org/10.1080/10618562.2014.922681.

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Li, Qin, Wei Sha, Fu Bao Li, and Shu Yi Xiao. "Oscillation Mechanism Analysis and Numerical Simulation for Tandem Self-Excited Oscillation Pulsed Jet Nozzle." Applied Mechanics and Materials 448-453 (October 2013): 3449–53. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3449.

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Self-excited oscillation pulsed jet is the new jet which is superior to the traditional continuous jet. In view of the insufficiency of the widely used organ pipe and Helmholtz resonator at present, firstly, with the actual needs of production as the background, a tandem Self-excited oscillation pulsed jet nozzles is presented in this paper. Then on the basis of previous studies, some new ideas are put forward after the cavity Self-excited oscillation mechanism is analyzed theoretically. Finally, numerical simulation of the nozzle flow field is carried out using FLUENT, then ideal pressure distribution contours and the streamline of the flow field are got, verifying the analysis of the oscillation mechanism.
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Ghanadi, Farzin, Maziar Arjomandi, Ben Cazzolato, and Anthony Zander. "Interaction of a flow-excited Helmholtz resonator with a grazing turbulent boundary layer." Experimental Thermal and Fluid Science 58 (October 2014): 80–92. http://dx.doi.org/10.1016/j.expthermflusci.2014.06.016.

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Zoccola, P. J. "Effect of opening obstructions on the flow-excited response of a Helmholtz resonator." Journal of Fluids and Structures 19, no. 7 (August 2004): 1005–25. http://dx.doi.org/10.1016/j.jfluidstructs.2004.04.013.

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Dai, Xiwen, Xiaodong Jing, and Xiaofeng Sun. "Flow-excited acoustic resonance of a Helmholtz resonator: Discrete vortex model compared to experiments." Physics of Fluids 27, no. 5 (May 2015): 057102. http://dx.doi.org/10.1063/1.4921529.

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Zoccola, Paul, Joseph Slomski, and Theodore Farabee. "Results of flow‐field quantities from computational fluid dynamics (CFD) analysis of a flow‐excited Helmholtz resonator." Journal of the Acoustical Society of America 119, no. 5 (May 2006): 3229. http://dx.doi.org/10.1121/1.4785956.

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Haiko, Hennadii, Oleksandr Zhivkov, and Lubov Pyha. "Application of resonant oscillatory systems for the seafloor gas hydrates development." E3S Web of Conferences 230 (2021): 01020. http://dx.doi.org/10.1051/e3sconf/202123001020.

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The prospects for the gas recovery from bottom gas hydrates are studied, and the necessity for the formation of an innovation environment and practical steps for conducting industrial experiments are formulated. The promising methods of shielded development of seafloor gas hydrate deposits are analyzed and the technical problems of their improvement are revealed. The possibilities of using resonant oscillatory systems for the shielded development of bottom gas hydrates are studied, in particular, a Helmholtz flow-excited resonator. The expediency of using high-quality oscillations of the “rotator” type has been substantiated in order to facilitate controlled gas hydrates dissociation over large areas of a gas hydrate field and to counteract the formation of new gas hydrates in the fractures of hydraulic reservoir fracturing. A method has been developed of gas recovery from bottom methane hydrates using a resonator device, which significantly reduces the energy consumption for the gas hydrates dissociation and contributes to the technological processes control.
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Dissertations / Theses on the topic "Flow-excited Helmholtz resonator"

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Ghanadi, Farzin. "Application of a Helmholtz resonator excited by grazing flow for manipulation of a turbulent boundary layer." Thesis, 2015. http://hdl.handle.net/2440/92808.

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In most industrial applications involving flow the Reynolds number is typically sufficiently high such that the boundary layer is turbulent. Flow instabilities within the turbulent boundary layer can result in an excessive drag penalty which is considered to be the main parameter affecting the aerodynamic efficiency in numerous applications including aircraft and pipelines. The aim of this research is manipulation of the turbulent boundary layer through the oscillatory flow created by a flow-excited Helmholtz resonator for the purpose of minimising the flow instabilities. Attention has been given here to a cylindrical Helmholtz resonator as a possible alternative flow control device. The energy required to activate the Helmholtz resonator comes from the grazing flow and it can be fitted to existing airframes with minimal manufacturing requirements. Hence it can potentially be an ideal solution for a wall-based flow control device. This research provides an insight into the behaviour of the flow in the vicinity of the resonator and assesses the capability of a flow-excited Helmholtz resonator for reduction of disturbances within the boundary layer. The excitation of flow in the vicinity of the Helmholtz resonator is associated with both the external pressure fluctuations within the turbulent boundary layer and the acoustic response of the resonator cavity. A model of the relationship between the pressure inside the cavity and the boundary layer was developed based on a momentum balance equation and combination of the vortex sheet with discrete vortex models. A parametric study of the resonator showed that when the orifice length is increased the pressure fluctuations within the resonator are reduced, potentially due to the larger skin friction inside the orifice. To understand the boundary layer features over a flow-excited Helmholtz resonator a Large Eddy Simulation (LES) of the three dimensional flow over a wide range of flow velocities was also conducted. It was demonstrated that when the boundary layer thickness equals the orifice length and is twice the orifice diameter, the flow suction within the orifice is greater than the flow injection area which results in a reduction in the turbulence intensity of up to 10%. Detailed investigation of the characteristics of the turbulent boundary layer downstream of the resonator has also been accomplished through an extensive experimental study in a subsonic wind tunnel with a low turbulence intensity level of 0.5%, for free stream velocities between 15 and 30m/s. Similar to the results of the numerical modelling, the experimental results showed that a resonator with an orifice length equal to the boundary layer thickness modifies near-wall structures such that the intensity of sweep is reduced by up to 5% and its duration by up to 8%. It was also demonstrated that when the orifice diameter approximately equals the thickness of the inner layer, ｙ⁺ ≈ 400, the velocity fluctuations normal to the grazing flow can penetrate the boundary layer, which in turn causes the large eddies to transfer their energy to the smaller eddies within the logarithmic region, resulting in attenuation of turbulence production. The results of this study provide an improved understanding for the further development of flow-excited Helmholtz resonators as a flow control device, an area that warrants further investigation in the future.
Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2015
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Conference papers on the topic "Flow-excited Helmholtz resonator"

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Buehn, Jacob, and Paul E. Slaboch. "Computational Study of Active Flow Control of a Flow-Excited Helmholtz Resonator." In 22nd AIAA Computational Fluid Dynamics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-3413.

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Slaboch, Paul, Ruolong Ma, and Scott Morris. "Vortical-acoustic interactions in a flow-excited Helmholtz resonator at low Mach numbers." In 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference). Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-2849.

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Ghanadi, Farzin, Maziar Arjomandi, Benjamin Cazzolato, and Anthony Zander. "EFFECTIVENESS OF FLOW-EXCITED HELMHOLTZ RESONATOR ON TURBULENCE STRUCTURES IN STREAMWISE AND SPANWISE DIRECTIONS." In Ninth International Symposium on Turbulence and Shear Flow Phenomena. Connecticut: Begellhouse, 2015. http://dx.doi.org/10.1615/tsfp9.410.

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Zhang, Man, Yuzhen Lin, and Wenjie Tao. "Analytical Study of Low-Frequency Helmholtz Mode Oscillation in a Model Combustor." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64130.

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The “growl” mode combustion instability is one of the most destructive phenomenon occurring in the lean burn aeroengine combustor at low power condition. This topic is widely investigated these years focusing on the mechanism of flame structures, oscillation modes and the development of prediction methods. Recently, an analytical prediction method which based on the linear solution of Helmholtz equation was successfully used to predict the inception of the growl instability. In this model, the flame tube and the inflow duct are modeled as individual cavities and connected through a swirler acting as the neck of Helmholtz resonators. However, in many applications, the inflow duct has more complex geometry and thus complex acoustic boundary condition. So there is the need to extend this approach in a more universal form. This is the motivation of the current work. This paper firstly presents the measured dynamic pressure and the flame motions in a single sector combustor. By changing the cross section area of the inflow duct, self-excited combustion instability was observed. This combustion instability mainly occurred at the frequency of 350HZ∼400Hz. The test results showed that flame front moves with the bulk flow in the axial direction while the pressure fluctuations in the inflow duct show a harmonic feature. It confirms that the combustion instability corresponds to the Helmholtz mode. This phenomenon was next analyzed with a new low-order linear acoustic method developed in this paper. The method integrates the model of Helmholtz resonator within harmonic oscillation (also called IM2H), and is validated by comparing with experimental data. By considering Helmholtz oscillation in the flame tube, the predicted frequency and mode agree well with experiments. The results show that the stability of the system is more sensitive to the geometry design parameter than the aerodynamics parameters.
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Macquisten, M. A., A. Holt, M. Whiteman, A. J. Moran, and J. Rupp. "Passive Damper LP Tests for Controlling Combustion Instability." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90874.

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The drive to low emissions from GT combustors has pushed manufacturers towards leaner combustion systems. Lean combustion systems are susceptible to thermo acoustic or combustion instabilities, which can significantly limit the operation of the GT in terms of performance and emissions. Combustion instability is the result of coupling between fluctuations in the heat release rate and pressure waves. The occurrence of instability dependent on (a) satisfying the Rayleigh criterion and (b) the growth must exceed the losses of acoustic energy. The growth of instability can be controlled by increasing the level of acoustic damping via a Helmholtz resonator and through viscous damping. Design rules for a passive damper have been developed through the EU funded project called PRECCINSTA (Prediction and control of combustion instabilities in tubular and annular combustion systems) by the University of Cambridge. These design rules are for a doubled-skinned perforated liner where a biasing flow is used to dissipated sound energy. The sound dissipation mechanism is via vortex formation. These design rules were then validated against atmospheric and intermediate pressure combustion tests at Rolls-Royce for self-excited and forced excited oscillations. This paper summaries these tests and gives the results for a simple perforated liner as a passive acoustic damper.
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He´mon, Pascal, Xavier Amandole`se, Franc¸oise Santi, and Jan Wojciechowski. "Study of the Acoustic Oscillations of Flow Over Cavities: Part 2 — Sound Reduction." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33376.

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We present experimental results obtained with a deep cavity, like an Helmholtz resonator, excited by an airflow. The resonance under the action of the vortices generated in the shear layer is well described and quantified. The mounting of actuators, based on a few piezo-electric elements, allows to generate a series of two-dimensional vortices forced at a frequency which is different than the natural resonance frequency. The sound level in the cavity is strongly decreased and the broadband noise of the turbulence only remains.
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