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Vasanthakumar, Parthasarathy and Ebel, Paul-Benjamin (2012) Forced response analysis of a transonic fan. In: Proceedings of ASME Turbo Expo 2012. ASME Turbo Expo 2012, 11.-15. Juni 2012, Kopenhagen, Dänemark.
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Abstract
The forced response of turbomachinery blades is a primary source of high cycle fatigue (HCF) failure. This paper deals with the computational prediction of blade forced response of a transonic fan stage that consists of a highly loaded rotor along with a tandem stator. In the case of a transonic fan, the forced response of the rotor due to the downstream stator assumes significance because of the transonic flow field. The objective of the present work is to determine the forced response of the rotor induced as a result of the unsteady flow field due to the downstream stator vanes. Three dimensional, Navier-Stokes flow solver TRACE is used to numerically analyse the forced response of the fan. A total of 11 resonant crossings as identified in the Campbell diagram are examined and the corresponding modeshapes are obtained from finite element modal analysis. The interaction between fluid and structure is dealt with in a loosely coupled manner based on the assumption of linear aerodynamic damping. The aerodynamic forcing is obtained by a nonlinear unsteady Navier-Stokes computation and the aerodynamic damping is obtained by a time-linearized Navier-Stokes computation. The forced response solution is obtained by the energy method allowing calculations to be performed directly in physical space. Using the modal forcing and damping, the forced response amplitude can be directly computed at the resonance crossings. For forced response solution, the equilibrium amplitude is reached when the work done on the blade by the external forcing function is equal to the work done by the system damping (aerodynamic and structural) force. A comprehensive analysis of unsteady aerodynamic forces on the rotor blade surface as a result of forced response of a highly loaded transonic fan is carried out. In addition, the correspondence between the location of high stress zones identified from the finite element analysis and the regions of high modal force identified from the CFD analysis is also discussed.
| Item URL in elib: | https://elib.dlr.de/78979/ | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Document Type: | Conference or Workshop Item (Speech, Paper) | |||||||||
| Title: | Forced response analysis of a transonic fan | |||||||||
| Authors: |
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| Date: | 2012 | |||||||||
| Journal or Publication Title: | Proceedings of ASME Turbo Expo 2012 | |||||||||
| Refereed publication: | Yes | |||||||||
| Open Access: | No | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | No | |||||||||
| In ISI Web of Science: | No | |||||||||
| Status: | Published | |||||||||
| Keywords: | transonic fan, high cycle fatigue (HCF), turbomachinery | |||||||||
| Event Title: | ASME Turbo Expo 2012 | |||||||||
| Event Location: | Kopenhagen, Dänemark | |||||||||
| Event Type: | international Conference | |||||||||
| Event Dates: | 11.-15. Juni 2012 | |||||||||
| Organizer: | ASME International Gas Turbine Institute | |||||||||
| HGF - Research field: | Aeronautics, Space and Transport | |||||||||
| HGF - Program: | Aeronautics | |||||||||
| HGF - Program Themes: | Propulsion Systems (old) | |||||||||
| DLR - Research area: | Aeronautics | |||||||||
| DLR - Program: | L ER - Engine Research | |||||||||
| DLR - Research theme (Project): | L - Virtual Engine and Validation Methods (old) | |||||||||
| Location: | Göttingen | |||||||||
| Institutes and Institutions: | Institute of Aeroelasticity | |||||||||
| Deposited By: | Erdmann, Daniela | |||||||||
| Deposited On: | 19 Dec 2012 16:57 | |||||||||
| Last Modified: | 29 Mar 2023 00:16 |
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