Ceramic Heat Shields for Lifting Re-entry Vehicles

1968 ◽  
Author(s):  
James N. Krusos
Keyword(s):  
Heat Shields

Ablation of ceramic and metallic heat shields

1974 ◽  
Author(s):  
M. ZIERING
Keyword(s):  
Heat Shields

Experimental study of the reduction of high temperatures and radiation using heat shields associated with flare towers of offshore oil and gas platforms

2014 ◽  
Vol 9 (5) ◽  
pp. 540-549 ◽  
Author(s):  
Sang Jin Kim ◽  
Sung In Park ◽  
Jong Chan Lee ◽  
Jung Kwan Seo ◽  
Bong Ju Kim ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Temperatures ◽  
Oil And Gas ◽  
Heat Shields ◽  
Offshore Oil And Gas ◽  
Offshore Oil

Uncertainty Quantification of Thermocouple Air Temperature Measurement in Highly Radiative Environment: Application to Turbofan Engine Compartment

2016 ◽  
Author(s):  
Y. Sommerer ◽  
V. Drouin ◽  
X. Nicolas ◽  
B. Trouette
Keyword(s):  
Heat Flux ◽  
Temperature Measurement ◽  
Air Temperature ◽  
Data Bank ◽  
Heat Shield ◽  
Engine Compartment ◽  
Heat Shields ◽  
Air Speed ◽  
Thermocouple Temperature ◽  
The Impact

This paper focuses on thermocouple air temperature measurement uncertainty due to the radiative fluxes present in the engine compartment where engine case skin temperature can exceed 900 K. To really measure air temperature, the convective heat flux in the thermocouple bead must be predominant. This is why heat shields are used in order to reduce the radiative heat flux on the bead. However, in engine compartment, the heat shield orientation must be optimized since numerous hot walls surround the thermocouple. In order to evaluate the impact of badly oriented heat shields and to provide a data bank for numerical simulation validations, a heated wind tunnel has been used. It has been shown that the uncertainty on the thermocouple temperature can reach dozens of degrees depending on the air speed and the heat shield orientation. Furthermore a specific 3D thermocouple model has been build and validated by comparison with the lab measurements. Then this thermocouple 3D model has been integrated in the whole engine compartment aero-thermal model in order to quantify the uncertainty of the thermocouple air temperature measurement in the real engine environment.

Optimal Failure-Finding Intervals for Heat Shields in a Gas Turbine Combustion Chamber Using a Multicriteria Approach

2015 ◽  
Vol 137 (7) ◽  
Author(s):  
Alejandro Martínez ◽  
Gloria Lara ◽  
Rodrigo Pascual ◽  
Enrique López Droguett
Keyword(s):  
Combustion Chamber ◽  
Risk Level ◽  
Second Stage ◽  
Heat Shields ◽  
Potential Failure ◽  
System Breakdown ◽  
Novel Strategy ◽  
Two Stages ◽  
Risk And Reliability Analysis ◽  
Multicriteria Methodology

When a component, as heat shields, degrade, two stages can be distinguished. First, a potential failure appears, which could evolve to the second stage and become a functional failure. The time between these two stages is called delay-time, which has been widely studied in literature to determine when to inspect to avoid breakdown. These studies have shown only single analysis criteria to find failure finding interval (FFI). In order to overcome this limitation, we developed a novel strategy to apply multicriteria methodology to optimize FFI. Our approach considers availability, system breakdown risk and reliability analysis from a systemic perspective, studying heat shields as groups, according to their location in the combustion chamber, regardless of age defect. Hence, it is not necessary to check every one of the shields. Our results show an optimal FFI policy subject to a determined breakdown risk level. This analysis may be adaptable to other components that can be grouped together.

Composite Heat Shields in Intense Energy Fluxes with Diffusion

2019 ◽  
Vol 39 (9) ◽  
pp. 800-803 ◽  
Author(s):  
L. N. Rabinskii ◽  
O. V. Tushavina
Keyword(s):  
Energy Fluxes ◽  
Heat Shields ◽  
Composite Heat

scholarly journals Phototherapy and the use of heat shields.

1988 ◽  
Vol 63 (10) ◽  
pp. 1295-1296
Author(s):  
S C Bayliss ◽  
M J Moseley ◽  
B Hobbs ◽  
D A Curnock
Keyword(s):  
Heat Shields
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