Effect of heat transfer on an angled cavity placed in supersonic flow

Vishnu, A.S.; Aravind, G. P.; Deepu, M.; Sadanandan, Rajesh

doi:10.1016/j.ijheatmasstransfer.2019.07.058

“…The heat transfer of a cavity exposed to a supersonic flow with an inclined rear wall of φ=60° and applying heat to the cavity walls (using hot oil supply to achieve the desired heat flux) was investigated experimentally and numerically by Vishnu et al [47]. It was also shown that the consecutive events driven by the fluid dynamic and acoustic mechanisms inside the cavity were altered by the increase in the fluid temperature.…”

Section: Heat Transfer From a Bottom-heated Cavitymentioning

confidence: 99%

Review-Heat Transfer Inside Cavity Flows Trends

Jabado

¹

,

Assoum

²

,

Hammoud

³

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

1

0

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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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“…The time trace of the heat transfer coefficients is shown in Figure 13. In Figure 13, X/L represents the normalized axial distance, which is calculated by equations ( 17) and (18). As described in equations ( 17) and ( 18), a negative value means that the fuel is in an endothermic state; on the contrary, positive heat transfer coefficients mean that the fuel is in an exothermic state.…”

Section: Heat Transfer Characteristics Figure 11 Describes the Regres...mentioning

confidence: 99%

“…A previous study [2] suggested that the regression rate was sensitive to the geometries [3][4][5], flight conditions [6], and the fuel types [7][8][9]. The thermodynamic performance of SFRJ, scramjet, and hybrid rockets were extensively investigated and reported in the literature [10][11][12][13][14][15][16][17][18][19][20]. A systematic investigation on a small-scale solid fuel ramjet and the combustion characteristic of boronfueled SFRJ were conducted in the Israel Institute of Technology, via both experimental and numerical approaches [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Inlet Thermodynamic Conditions on Solid Fuel Ramjet Performances

Li

¹

,

Zhao

²

,

Chen

³

et al. 2021

International Journal of Aerospace Engineering

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In this work, 2D numerical RANS (Reynolds Average Navier-Stokes) simulations were carried out to investigate the thermodynamic performance of a solid fuel ramjet (SFRJ) with different inlet conditions. This is achieved by using an in-house FORTRAN code to simulate a 2D turbulent, reacting, unsteady flow in the ramjet engine. The inlet conditions are characterized by three key parameters: (1) swirl number ( S N ), (2) mass flow rate ( m ̇ air ), and (3) inlet temperature ( T in ). With the code numerically validated by benchmarking with a number of computed cases, it is applied to perform systematic studies on the turbulent flow recirculation, combustion, and heat transfer characteristics. It is found that increasing S N , m ̇ air , or T in can dramatically enhance the combustion heat release rate, regression rate, and combustor average temperature. Furthermore, the analysis on the chemical reaction intermediate (CO) reveals that the chemical reaction is more sufficient with increased m ̇ air , but S N = 0 . In addition, a secondary vortex is generated at the corner of the backward facing step in the presence of a swirl flow resulting from the instability of the shear layer. Finally, the nonlinear correlations between the heat transfer, combustion characteristics, and flow field characteristics and the corresponding inlet thermodynamic parameters are identified.

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“…In a double lid‐driven porous cavity, the aspiration of surrounding fluid results in heightened HT compared to a nonaspirated cavity, with enhancements of up to 180% depending on the specific parameters 47 . Conducting both experimental and numerical studies, Vishnu et al 48 investigated the impact of HT on an open cavity exposed to supersonic crossflow. The observations revealed that the introduction of aspiration induces alterations in flow dynamics, including the expansion of the recirculation region and oscillation of the shear layer.…”

Section: Introductionmentioning

confidence: 99%

Enhanced thermal performance and entropy generation analysis in a novel cavity design with circular cylinder

Saha,

Jihan,

Ahammad

et al. 2024

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Analyzing fluid dynamics and heat transfer holds significant importance in the design and enhancement of engineering systems. The current investigation utilizes the finite element method to explore natural convection and heat transfer intricacies within a novel cavity containing an inner circular cylinder under steady and laminar flow conditions. The principal aim of this study is to assess the impact of Rayleigh number (Ra), Bejan number (Be), and the presence of adiabatic, hot, and cold cylinders on heat transfer, entropy generation, and fluid flow. The range of Ra considered in this investigation spans from 103 to 106, while the Prandtl number for the air is fixed at 0.71. The findings illustrate that the presence of a cylinder leads to higher Be as Ra increase, compared to scenarios where no cylinder is present. This observation suggests that buoyancy forces dominate in the absence of a cylinder, resulting in significantly enhanced convective heat transfer efficiency. However, the presence of a heated cylinder within the tooth‐shaped cavity exerts a substantial influence on the overall thermal performance of the system. Notably, the average Nusselt Number (Nu) experiences a remarkable increase of 41.97% under the influence of a heated cylinder, when compared to situations where a cold cylinder is present. This elevated average Nu signifies improved heat transfer characteristics, ultimately resulting in an overall improvement in the thermal system's efficiency.

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Effect of heat transfer on an angled cavity placed in supersonic flow

Cited by 16 publications

References 22 publications

Review-Heat Transfer Inside Cavity Flows Trends

Review-Heat Transfer Inside Cavity Flows Trends

Numerical Investigation of Inlet Thermodynamic Conditions on Solid Fuel Ramjet Performances

Enhanced thermal performance and entropy generation analysis in a novel cavity design with circular cylinder

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