[TOPIC 02] : NSV and other aero intabilities
NSV and other aero intabilities
motivation :
Non-synchronous vibration (NSV) is an aeroelastic phenomenon that can restrict the safe operating range of turbomachinery. Unlike synchronous vibrations, NSV occurs at frequencies unrelated to shaft speed and has been observed in fans, compressors, and turbines across varied conditions. Its effects range from destructive high-cycle fatigue to stable limit-cycle oscillations, both of which threaten durability and efficiency. NSV is driven by complex aerodynamic features—such as tip-clearance vortices, shock interactions, and flow separation—making prediction difficult. Alongside other instabilities like rotating stall, NSV remains a critical challenge requiring advanced modeling and design strategies to ensure reliable engine performance.
topics of interest :
Proposed research shall progress the understanding in one or more of these topics. Research may be analytical or experimental. Analytical work should be validated with existing data or through partnerships within GUIde 8.
- Compressor stall and/ or NSV
- NSV sensitivity to corrected speed (Nc) and variable stator vane angles
- Precursors to NSV in first-stage compressors (1D design parameters, blade loading metrics)
- Lock-in and limit-cycle prediction for convective NSV
- Shock-boundary layer interaction NSV
- Analytical techniques to predict structural response to surge
- Separated flow vibration response prediction
expected deliverables :
Deliverables may include the following, but other deliverables may be proposed.
- Experimental and/or analytical data
- Analytical and/or numerical approaches to predict the levels of vibrations
- Key-driven of aerodynamic instability / vibrations: operating conditions, blade design parameters, etc.
subtopics :
- Compressor NSV
- Compressor stall
- NSV sensitivity to corrected speed (Nc) and variable stator vane angles
- Precursors to NSV in first-stage compressors (1D design parameters, blade loading metrics)
- Lock-in and limit-cycle prediction for convective NSV
- Shock-boundary layer interaction NSV
- Analytical techniques to predict structural response to surge with experimental validation
- Separated flow vibration response prediction
Other contributors to RfP
- Atsushi Tateishi (IHI)
- Detlef Korte (MTU)
- Eijiro Kitamura (Honda)