Measurement of Surface Heat Flux Distribution on a Transpiration Cooled Wedge in a Supersonic High-Enthalpy Air Flow

2019 ◽  
Author(s):  
Stefan Loehle ◽  
Fabian Hufgard ◽  
Hannah Boehrk ◽  
Christian Dittert
Keyword(s):  
Heat Flux ◽  
Surface Heat Flux ◽  
Flux Distribution ◽  
Air Flow ◽  
Surface Heat ◽  
Heat Flux Distribution ◽  
High Enthalpy

Research on the Protection of Forward-Facing Cavity on the Flow Field of Low Total Pressure Opposing Jet

2014 ◽  
Vol 684 ◽  
pp. 335-340 ◽  
Author(s):  
Hai Bo Lu ◽  
Leng Han
Keyword(s):  
Heat Flux ◽  
Flow Field ◽  
Surface Heat Flux ◽  
Total Pressure ◽  
Flux Distribution ◽  
Surface Heat ◽  
Numerical Results ◽  
Cooling Effect ◽  
Heat Flux Distribution ◽  
Stable Flow

This paper focus on the detailed influence of forward-facing cavity on the opposing jet. The flow field of a hemisphere nose-tip with the combined configuration was simulated numerically and the surface heat flux distribution was obtained. The numerical results show that a suitable cavity is helpful for the opposing jet. With the same total pressure, the single opposing jet even can’t form a stable flow field and there is no cooling effect.

Numerical Simulation of the Thermal Performance of Cable Radiant Heating Floors with Different Structure

2012 ◽  
Vol 512-515 ◽  
pp. 3047-3050
Author(s):  
Quan Ying Yan ◽  
Li Li Jin
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Surface Heat Flux ◽  
Optimization Design ◽  
Flux Distribution ◽  
Heat Transfer Process ◽  
Surface Heat ◽  
Radiant Heating ◽  
Heat Flux Distribution ◽  
Ansys Software

In this paper, three kinds of mathematical models of cable heated radiant floors were established, and numerical simulation of heat transfer process for these heated floors were carried on by using finite element method and ANSYS software. The rule of temperature distribution, surface heat flux distribution and downward heat loss of these three floor structures were given and compared. The results can provide references for a further optimization, design and application of low temperature radiant heating floor.

scholarly journals Experimental Study of Forced- Convection from Horizontal Rectangular Fins Array into Air Duct

2019 ◽  
Vol 15 (1) ◽  
pp. 35-45
Author(s):  
Saad Najeeb Shehab
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Flow Velocity ◽  
Forced Convection ◽  
Surface Heat Flux ◽  
Rectangular Cross Section ◽  
Air Flow ◽  
Surface Heat ◽  
Wide Range ◽  
Air Flow Velocity

    In this work, an experimental study has been done to expect the heat characteristics and performance of the forced-convection from a heated horizontal rectangular fins array to air inside a rectangular cross-section duct. Three several configurations of rectangular fins array have been employed. One configuration without notches and perforations (solid) and two configurations with combination of rectangular-notches and circular-perforations for two various area removal percentages from fins namely 18% notches-9% perforations and 9% notches-18% perforations are utilized.  The rectangular fins dimensions and fins number are kept constant. The fins array is heated electrically from the base plate with five different magnitudes of power-inputs. Five several air flow velocity into a duct are utilized. The influence of fin geometry, air flow velocity, Reynolds number and the surface heat flux on the heat-performance of forced heat convection have been simulated and studied experimentally. The experimental data indicates that the combination of 18% rectangular-notched and 9% circular-perforated rectangular fins array gave best forced heat performance in terms of average heat transfer coefficient about (25% - 45%) and (7% - 20%) compared than solid and 9% notches with18% perforations fins array respectively. Five empirical correlations to predict the average Nusselt number for the 18% notches with 9% perforations rectangular fins array at wide range of surface heat flux are deduced. The present data are compared with previous works and a good closeness in behavior is noticed.

Numerical investigation of heat flux distribution in a deep gap based on chemical equilibrium

2017 ◽  
Vol 27 (8) ◽  
pp. 1662-1674 ◽  
Author(s):  
Guo Huang ◽  
Haiming Huang
Keyword(s):  
Heat Flux ◽  
Flow Field ◽  
Chemical Equilibrium ◽  
Flux Distribution ◽  
Thermal Protection ◽  
Air Flow ◽  
Hypersonic Vehicles ◽  
Heat Flux Distribution ◽  
Content Type ◽  
Gap Flow

Purpose The purpose of this paper is to perform the simulation to explore the gap flow field under a hypersonic air flow. Thermal protection systems of hypersonic vehicles generally consist of thermal insulation tiles, and gaps between these tiles probably cause a severe local aerodynamic thermal effect. Design/methodology/approach The discretizations of convection flux term and temporal term in the governing equation with chemical equilibrium, respectively, take AUSM+-up flux-vector splitting scheme and the implicit lower-upper symmetric Gauss–Seidel method. Based on these, the flow field in a deep gap is simulated by means of the computer codes that the authors have written. Findings The numerical results show that the heat flux distribution in a gap has a good agreement with experimental results. Importantly, the distribution of heat flux is “U” shaped and the maximum of the heat flux occurs at the windward corner of a gap. Originality/value To explore the gap flow field under a hypersonic air flow, which is a chemically reacting, all speed and viscous flow, a novel model with an equivalent ratio of specific heats is presented. The investigation in this paper has a guide for the design of the thermal protection system in hypersonic vehicles.

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