Heat transfer intensification using acoustic waves in a cavity

Rulik, Sebastian; Wróblewski, Włodzimierz; Nowak, Grzegorz; Szwedowicz, J.

doi:10.1016/j.energy.2015.04.088

Cited by 12 publications

(11 citation statements)

References 12 publications

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“…When operating with the gasoline PPC concept, (d p/dα) max is one order of magnitude larger compared to that obtained when operating with the CDC concept even at earlier values of SoE2. The high RoHR generated by the gasoline PPC concept explains this fact, as indeed the pressure time-derivative is strongly influenced by this parameter [61]. On the contrary, lower local temperatures attained during the premixed combustion allow to reduce high frequency oscillations in the pressure profile until a certain SoE2 (-38 cad aTDC).…”

Section: Comparative Frequency Analysis Of Cdc and Gasoline Ppc Conceptsmentioning

confidence: 99%

Combustion noise analysis of partially premixed combustion concept using gasoline fuel in a 2-stroke engine

Broatch

Margot

Novella

et al. 2016

Energy

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ElsevierBroatch Jacobi, JA.; Margot, X.; Novella Rosa, R.; Gómez-Soriano, J. (2016). Combustion noise analysis of partially premixed combustion concept using gasoline fuel in a 2-stroke engine. Energy. 107:612-624. AbstractIn the last decade, different advanced combustion concepts based on generating totally or partially premixed conditions have been investigated in CI engines with the aim of achieving lower NOx and soot emissions. Most of the drawbacks inherent to this type of combustions, such as the combustion phasing control or combustion stability, can be mitigated by combining the PPC concept fueled by gasoline and a small 2-stroke HSDI engine. However, combustion noise issue remains unsolved while it is a critical aspect due to its strong influence in the customer purchasing decision and compliance of more stringent regulations. In this work, an analysis of the combustion noise generated by PPC combustion concept is performed in order to identify the most influential parameters and to define key paths for controlling the noise level. In addition, 3D CFD simulations have been performed to further understand the combustion noise generation mechanisms. Results evidence how the strong impact of the maximum pressure time-derivative achieved during combustion process renders all other sources of noise generation irrelevant. The trade-off between combustion noise and combustion efficiency of this PPC concept has been confirmed, while the intrinsic relation between such parameters and the engine efficiency has been also evaluated.

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Section: Comparative Frequency Analysis Of Cdc and Gasoline Ppc Conceptsmentioning

confidence: 99%

Combustion noise analysis of partially premixed combustion concept using gasoline fuel in a 2-stroke engine

Broatch

Margot

Novella

et al. 2016

Energy

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“…Many studies investigated the enhancement of heat transfer using acoustic waves, Legay et al [23] summarized the studies that use ultrasound in order to enhance the heat transfer or the cooling process across cavities. A new approach was presented by Rulik et al [24][25][26][27] to study the impact of acoustic waves on heat transfer intensification. The first approach Rulik et al proposed was implemented in a study that aimed at im-proving the performance of gas turbines, through an appropriate cooling technique of the turbine components [24].…”

Section: Acoustic Waves Effect On Heat Transfer In Cavitiesmentioning

confidence: 99%

Review-Heat Transfer Inside Cavity Flows Trends

Jabado

Assoum

Hammoud

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The complex cavity flow represented by the feedback mechanism and self-sustained oscillations of cavity shear layer are widely investigated in various publications either through analysing the aero-acoustic phenomenon occurring and its control or through examining the heat transfer mechanism in such a flow. Boundary layer separation, turbulence, unsteadiness, recirculation and reattachment complicate the flow phenomena at the cavity and may lead to substantial effects on heat transfer. Besides, in order to enhance the heat transfer in some applications, cavity flow was introduced, and thus the importance of understanding the cavity flow structure and its relation with heat transfer has become vital, where such a phenomenon occurs in many engineering applications. This paper presents a literature review on the studies that focus on examining heat transfer in cavity flow, by evaluating the effect of cavity geometry and inlet flow field on heat transfer at different cavity regions.

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“…Semlitsch et al [10] used LES and experimental studies to investigate the relationship between screech tone amplitude and the fluidic injection pressure of the non-ideal expanded supersonic jet. The research presented in this paper is an extension of the work presented in [11][12][13]. The purpose of these works was acoustic and flow analysis using CFD methods, as well as analysis of heat transfer conditions in the case of heated cavities.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of the Noise Generated in a Ducted Cavity Working in Various Conditions

2021

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Flow over a cavity or a gap may induce pressure fluctuations that are emitted as sound waves and perceived by a human as noise. This phenomenon may occur in different kinds of industrial machines or in everyday life devices, e.g., cars. For this reason, it is important to predict the flow conditions that intensify or attenuate the noise. This research paper presents the numerical and experimental analysis of the pressure fluctuations in a deep, ducted cavity. The experimental test stand made it possible to investigate the flow over a cavity with air velocity in the range of 30–80 m/s. The pressure fluctuations were measured using miniature microphones located in the duct and the cavity wall and processed with LabView software. The phenomena were also analysed using the computational fluid dynamics (CFD) technique. The several modelling approaches were tested and validated against the experimental data. The highest sound pressure levels were obtained for 40 and 70 m/s. The sound frequency increased with the flow velocity.

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Heat transfer intensification using acoustic waves in a cavity

Cited by 12 publications

References 12 publications

Combustion noise analysis of partially premixed combustion concept using gasoline fuel in a 2-stroke engine

Combustion noise analysis of partially premixed combustion concept using gasoline fuel in a 2-stroke engine

Review-Heat Transfer Inside Cavity Flows Trends

Numerical and Experimental Analysis of the Noise Generated in a Ducted Cavity Working in Various Conditions

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