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Temperatures and Stresses on Hollow Blades For Gas TurbinesThe present treatise reports on theoretical investigations and test-stand measurements which were carried out in the BMW Flugmotoren GMbH in developing the hollow blade for exhaust gas turbines. As an introduction the temperature variation and the stress on a turbine blade for a gas temperature of 900 degrees and circumferential velocities of 600 meters per second are discussed. The assumptions onthe heat transfer coefficients at the blade profile are supported by tests on an electrically heated blade model. The temperature distribution in the cross section of a blade Is thoroughly investigated and the temperature field determined for a special case. A method for calculation of the thermal stresses in turbine blades for a given temperature distribution is indicated. The effect of the heat radiation on the blade temperature also is dealt with. Test-stand experiments on turbine blades are evaluated, particularly with respect to temperature distribution in the cross section; maximum and minimum temperature in the cross section are ascertained. Finally, the application of the hollow blade for a stationary gas turbine is investigated. Starting from a setup for 550 C gas temperature the improvement of the thermal efficiency and the fuel consumption are considered as well as the increase of the useful power by use of high temperatures. The power required for blade cooling is taken into account.
Document ID
20030066157
Acquisition Source
Langley Research Center
Document Type
Other - NACA Technical Memorandum
Authors
Pollmann, Erich (Zentrale fuer Wissenschaftliches Berichtswesen Berlin, Germany)
Date Acquired
September 7, 2013
Publication Date
September 1, 1947
Publication Information
Publication: Zentrale fuer Wissenschaftliches Berichtswesen der Luftfahrtforschung des Generalluftzeugmeisters Berlin-Adlershof
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NACA-TM-1183
Forschungsbericht-1879
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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