Survey of Advantages and Problems Associated with Transpiration Cooling and Film Cooling of Gas-turbine Blades

Survey of Advantages and Problems Associated with Transpiration Cooling and Film Cooling of Gas-turbine Blades
Author: Ernst Rudolf Georg Eckert
Publisher:
Total Pages: 44
Release: 1951
Genre: Aerodynamics
ISBN:

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.

Survey of Advantages and Problems Associated With Transpiration Cooling and Film Cooling of Gas-turbine Blades

Survey of Advantages and Problems Associated With Transpiration Cooling and Film Cooling of Gas-turbine Blades
Author: Lewis Research Center
Publisher: Hassell Street Press
Total Pages: 44
Release: 2021-09-09
Genre:
ISBN: 9781013358746

This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Wire Cloth as Porous Material for Transpiration-cooled Walls

Wire Cloth as Porous Material for Transpiration-cooled Walls
Author: Ernst Rudolf Georg Eckert
Publisher:
Total Pages: 48
Release: 1951
Genre: Aerodynamics
ISBN:

Abstract: The permeability characteristics and tensile strength of a porous material developed from stainless-steel corduroy wire cloth for use in transpiration-cooled walls where the primary stresses are in one direction were investigated. The results of this investigation are presented and compared with similar results obtained with porous sintered metal compacts. A much wider range of permeabilities is obtainable with the wire cloth than with the porous metal compacts considered and the ultimate tensile strength in the direction of the primary stresses for porous materials produced from three mesh sizes of wire cloth are from two to three times the ultimate tensile strengths of the porous metal compacts.

Experimental Investigation of Air-flow Uniformity and Pressure Level on Wire Cloth for Transpiration-cooling Applications

Experimental Investigation of Air-flow Uniformity and Pressure Level on Wire Cloth for Transpiration-cooling Applications
Author: Patrick L. Donoughe
Publisher:
Total Pages: 32
Release: 1952
Genre: Aerodynamics
ISBN:

Abstract: An experimental investigation was conducted to obtain information on air-flow uniformity and pressure-level effects for various meshes of stainless-steel corduroy wire cloth, and permeability and strength data for a 20- by 20-mesh stainless-steel wire cloth. It was found that close control of the wire cloth thickness yielded sufficiently uniform air flow and that available methods may be used to predict the effect of pressure level. Permeability and strengths of the 20- by 20-mesh wire cloth were similar to those already available from other meshes. The reduced tensile strength of the 20- by 20-mesh wire cloth in the direction of the primary stresses is one and a half to three times as great as the strength of the best porous sintered materials presently available.

Wind-tunnel Investigation of Effects of Fuselage Cross-sectional Shape, Fuselage Bend, and Vertical-tail Size on Directional Characteristics of Nonoverlap-type Helicopter Fuselage Models Without Rotors

Wind-tunnel Investigation of Effects of Fuselage Cross-sectional Shape, Fuselage Bend, and Vertical-tail Size on Directional Characteristics of Nonoverlap-type Helicopter Fuselage Models Without Rotors
Author: James L. Williams
Publisher:
Total Pages: 736
Release: 1956
Genre: Helicopters
ISBN:

A low-speed investigatio was made in the Langley stability tunnel to determine the directional stability characteristics of tandem nonoverlap-type helicopter fuselages without rotors. The investigation consisted of a study of both bent and straight fuselages having either circular or essentially elliptical cross sections and with two vertical-tail sizes.