Abstract
In this paper we introduce a mapping procedure which facilitates the simulation of flow-induced vibrations in turbomachinery. The transient steady state pressure fluctuations in the flow field (which excite vibrations) are computed in the frequency domain by what are generally referred to as “harmonic CFD” methods where the pressure oscillations are expressed by complex amplitudes. They are mapped using the Fraunhofer software FSIMapper to a structural vibration analysis. A main focus lies in the provision of mapping methods for cyclic symmetric models. The process provides a fast numerical assessment of flow-induced vibrations where the resulting vibration amplitudes can be used for realistic fatigue estimations of flow-excited turbine components. The procedure is applied to a ceramic impeller of a micro gas turbine.
Highlights
Turbomachinery is deployed in a variety of industrial systems
The presented mapping procedure has been applied during an internal Fraunhofer research project called MAVO TurboKeramik
This paper presents a mapping procedure for the analysis of flow-induced vibrations in turbomachinery applications
Summary
Turbomachinery is deployed in a variety of industrial systems. Flow-induced vibrations can lead to a high noise emission and to blade fatigue which can endanger the integrity of the whole system. Design optimisation for the reduction of product size and weight leads inter alia to a reduction of the distance between rotor blades and stationary guide vanes. This increases the unsteady interactions and thereby the excitation of the already highly loaded blading in the whole flow channel. Numerical simulations of those excitation forces and vibration responses lead to time- and cost-savings in the prototyping and testing of products since the design process is moved to earlier development phases. A faster simulation approach – the Nonlinear Harmonic method – and its application in a new mapping process are the topic of this paper
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