Author: S. S. KutateladzePublisher:
ISBN:
Category :
Languages : en
Pages : 16
Book Description
Film Cooling with a Turbulent Gaseous Boundary Layer
Author: S. S. KutateladzeEffects of Variable Properties in Film Cooled Turbulent Boundary Layers
Author: Alfred F. Jr WalzPublisher:
ISBN:
Category :
Languages : en
Pages : 76
Book Description
The effects of variable properties on heat transfer in a film-cooled turbulent boundary layer were investigated. A new procedure was developed to deduce adiabatic effectiveness from heat transfer coefficients based on the wall to freestream temperature difference, where both are representative of variable property flow conditions. The new technique was shown to be valid using data from the literature for injection into a turbulent boundary layer from one and two rows of injection holes. From these results, the variation of the coolant to mainstream density ratio was shown to have a significantly greater effect on heat transfer than variations of viscosity and thermal conductivity. Keywords: Gas turbine cooling; Film cooling; Turbulent boundary layers; Variable properties. (Theses).
Survey of Advantages and Problems Associated with Transpiration Cooling and Film Cooling of Gas-turbine Blades
Author: Ernst Rudolf Georg EckertPublisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 44
Book Description
Summary: Transpiration and film cooling promise to be effective methods of cooling gas-turbine blades; consequently, analytical and experimental investigations are being conducted to obtain a better understanding of these processes. This report serves as an introduction to these cooling methods, explains the physical processes, and surveys the information available for predicting blade temperatures and heat-transfer rates. In addition, the difficulties encountered in obtaining a uniform blade temperature are discussed, and the possibilities of correcting these difficulties are indicated. Air is the only coolant considered in the application of these cooling methods.
Multi-row Film Cooling Boundary Layers
Author: Greg NatsuiPublisher:
ISBN:
Category :
Languages : en
Pages : 320
Book Description
High fidelity measurements are necessary to validate existing and future turbulence models for the purpose of producing the next generation of more efficient gas turbines. The objective of the present study is to conduct several different measurements of multi-row film cooling arrays in order to better understand the physics involved with injection of coolant through multiple rows of discrete holes into a flat plate turbulent boundary layer. Adiabatic effectiveness distributions are measured for several multi-row film cooling geometries. The geometries are designed with two different hole spacings and two different hole types to yield four total geometries. One of the four geometries tested for adiabatic effectiveness was selected for flowfield measurements. The wall and flowfield are studied with several testing techniques. Pressure sensitive paint and discrete gas sampling taps are simultaneously used to measure adiabatic film cooling effectiveness by taking advantage of the heat and mass transfer analogy. All cooling regimes documented by Goldstein (1) for a single row are seen in the multi-row geometries studied. As the blowing ratio increases from 0, the laterally averaged effectiveness increases everywhere, until a point is reached at which upstream rows begin to drop in performance while the downstream rows increase in performance. Finally, a point is reached at which the cooling performance drops everywhere as the blowing ratio is increased.
Simulation of Film Cooling Flows for Gas Turbine Applications
Author: Christopher A. LemmonPublisher:
ISBN:
Category :
Languages : en
Pages : 410
Book Description
Combustor Liner Film Cooling in the Presence of High Free-stream Turbulence
Author: Albert J. JuhaszPublisher:
ISBN:
Category : Coatings
Languages : en
Pages : 60
Book Description
A Study of Film Cooling in the Compressible Turbulent Boundary Layer Induced by a Travelling Shock Wave
Author: Jiunn-Yih LiawFilm Cooling with Ejection from a Row of Inclined Circular Holes
Author: Christian LiessPublisher:
ISBN:
Category : Cooling
Languages : en
Pages : 116
Book Description
Full-coverage Film Cooling
Author: S. YavuzkurtPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 238
Book Description
Film Cooling and Turbine Blade Heat Transfer
Author: Publisher:
ISBN:
Category : Aircraft gas-turbines
Languages : en
Pages : 328
Book Description