film cooling

film cooling

[′film ‚kül·iŋ]
(thermodynamics)
The cooling of a body or surface, such as the inner surface of a rocket combustion chamber, by maintaining a thin fluid layer over the affected area.

film cooling

The injection of a coolant directly into a combustion chamber, usually through small orifices to provide a cooling film on the inner wall surface. When the coolant enters through the pores of a porous wall material, this is usually called sweat cooling or transpiration cooling.
References in periodicals archive ?
Manufacturer of patented blown film cooling air rings focused on high output, film quality, and operational simplicity, plus automatic and manual gauge controls, IBC.
The IP68 rated P30 Pro is powered by a 7nm Kirin 980 processor and a graphene film cooling system to keep the device temperature in check.
The company is using a graphene film cooling technology on the handset along with a vapor chamber design, according to(https://www.theverge.com/2018/10/16/17983328/huawei-mate-20-x-release-date-news-features) The Verge.
After an overview and chapters on turbine cooling design and turbomachinery clearance control, coverage includes internal cooling, film cooling, endwall aerodynamics and heat transfer, trailing-edge cooling, blade tip aerodynamics and heat transfer, nickel-based superalloys, thermal barrier coatings, nondestructive evaluation, and erosion, deposition, and their effect on performance.
Excessive use of compressor air for turbine film cooling can, however, reduce engine efficiency.
Film cooling technique is an effective way for the protection of these vanes and blades.
A wide variety of cooling technologies including film cooling and impinging cooling have been successfully used in cooling of these hot components for a few decades.
The topics include cross-injection film cooling on a curved surface with or without a vortical flow in the mainstream, the mixed convection boundary layer flow of viscoelastic fluids past a sphere, optimizing a thermoelectric air conditioning system, the alternating current magnetic heating of superparamagnetic iron and cobalt nanoparticles, and the numerical simulation and experimental validation of heat conductivity in metallic hollow sphere structures.
Track 2--Turbine blade tip heat transfer, internal, external, and film cooling
Film cooling technology using relative cooler air from the cooling holes to impede the blade from the higher temperature gas is widely applied in high-pressure turbine blade as an important heat protection method.
This enables more accurate control of film cooling, resulting in more precise and more uniform thickness.