The use of whole engine finite element models has confirmed in impressive manner that they can simulate both the quasi static and the dynamic behaviour of aero-engines realistically. The deviations found in the validation phase are surprisingly small. A further step into the realistic modelling of a complete engine will be the coupling of structural and aerodynamic codes so that complete stages or even components can be tested in a 'virtual engine' test bed, long before the first metal is cut. Then the engineer would be able to study the effect of modifications on an extremely complex system at the screen already during the design phase. A first step into this direction is the extension and supplement of the non-linear transient program. Influences of the aerodynamic forces on blades of compressor and turbine were considered by means of the so-called Alford's forces, depending from the varying rotor speed. Curves of the oil temperature in the squeeze film dampers determined experimentally were incorporated into the program depending on the rotation speed, too. Simultaneously the height of the squeeze film gap is adjusted to the corresponding temperatures. Additionally the progress of the calculation can be directly monitored on the screen. This represents only one instantant in time. Depending on the required information, the following quantities can be monitored on-line: vibration velocity, gap clearance, signal analysis at each defined point. This first step is extended continuously. With the power of the computers increasing constantly, the models which increase in complexity will provide more precise forecasts in the future. (Contributions and author's replies in Vol. 7, p 1788)
Interdisciplinary design for aero-mechanical interaction in modern turbomachinery
Interdisziplinäre Auslegung zur Berücksichtigung der aerodynamisch-konstruktiven Wechselwirkung in modernen Strömungsmaschinen
1998
17 Seiten, 19 Bilder, 10 Quellen
(+ 1 p. Discussion)
Conference paper
English
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