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 ?
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, decrease engine efficiency.
The objective is to develop validated models, methods and best practices for prediction of film cooling.
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
com) will also display innovations in the areas of dies, film cooling, and winding, as well as new multi-wrap technology for stretch films, designed to seamlessly integrate with existing Gloucester winders.
This enables more accurate control of film cooling, resulting in more precise and more uniform thickness.
Film cooling is by far the most sophisticated applied technique available and consequently used for high temperature gas turbine systems.
The temperature of compounding section was adjusted at 210[degrees]C and screw speed was fixed at 100 rpm For film cooling (besides natural air cooling), a fan was installed to supply air to the film surface right at the exit of the die.
Forming, film unwinding and positioning the film cooling plates are all fully controlled by brushless motors.
First of all, it concerns the sub-assemblies of a guiding unit of turbines and combustion chambers, having a system of perforated holes providing the film cooling of surface of parts being repaired, flaps of an adjustable nozzle, etc.
Options for the machine include side-mounted film rack, film cooling section, pre-spacing conveyor, casters and spare-parts kit.