Flutter analysis of advanced turbopropellers

Elchuri, V.; Smith, G. C. C.

doi:10.2514/3.8683

Cited by 9 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Section B presents a complete aeroelastic analysis in accordance with ref. 25 These two test cases represents the validation verification benchmarks of the proposed aeroelastic analysis technique. In Section C and in Section D the aeroelastic analyses are conducted without reference to any result available from the literature, but only on the base of the awareness gained from the previous benchmarks.…”

Section: Resultsmentioning

confidence: 99%

“…Ref. 25 uses this method to predict flutter boundaries and so it is a useful test case for validating the formulation proposed to carry out the aerodynamic transfer function H am . The results obtained are reported in next section.…”

Section: K-e(fficient) Methodsmentioning

confidence: 99%

“…It can be inferred that the S T solver provides results very similar to those obtained in ref. 25,39 In both cases there is a flutter of the second mode (i.e. the second bending one) at the asymptotic velocity of 190 m/s and 179 m/s for case 2 and case 3 respectively and for critical reduced frequencies between 0.2 and 0.3.…”

Section: Flutter Analysesmentioning

confidence: 97%

“…Ref. 37 Ref. Mach number is about 1.2 at the tip of the blade and the angle of attack at 75% of the span is 8°and 14°, respectively for case 2 and case 3.…”

Section: Structural Modal Analysismentioning

confidence: 99%

“…The structural grid is taken from ref. 36 The blade is discretized only with shell elements and is fully constrained at its base. Table 4 reports the first 6 normal frequencies for the rotating blade at an angular velocity of 6800 RPM.…”

Section: Structural Modal Analysismentioning

confidence: 99%

See 4 more Smart Citations

Flutter Analysis of Propfan–Open Rotors

Prederi¹,

Parrinello

Gadda

et al. 2018

Journal of Aircraft

View full text Add to dashboard Cite

The work aims at showing the importance of flutter predictions in the preliminary design of Propfan-Open Rotors. Both single rotating propellers and contra rotating open rotors are investigated. The related structural sub-systems are modelled through finite element analyses, the aerodynamic sub-systems exploit a finite volume full potential formulation suitable for unsteady transonic flows. An ad hoc technique is developed for simulating the flow field around a contra rotating open rotor configuration. The effectiveness of the proposed aeroelastic analysis is successfully assessed for single propellers through comparisons with reference numerical and experimental data available in the literature, as well as against Euler flow based solutions. Results for contra rotating open rotors cannot be validated because of the lack of corresponding open literature data.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: K-e(fficient) Methodsmentioning

confidence: 99%

Section: Flutter Analysesmentioning

confidence: 97%

“…Ref. 37 Ref. Mach number is about 1.2 at the tip of the blade and the angle of attack at 75% of the span is 8°and 14°, respectively for case 2 and case 3.…”

Section: Structural Modal Analysismentioning

confidence: 99%

Section: Structural Modal Analysismentioning

confidence: 99%

See 3 more Smart Citations

Flutter Analysis of Propfan–Open Rotors

Prederi¹,

Parrinello

Gadda

et al. 2018

Journal of Aircraft

View full text Add to dashboard Cite

show abstract

Flutter analysis of propfans using a three-dimensional Euler solver

Srivastava

Reddy

Mehmed

1996

Journal of Propulsion and Power

View full text Add to dashboard Cite

Analytical flutter investigation of a composite propfan model

Kaza

Mehmed

Narayanan³

et al. 1989

Journal of Aircraft

View full text Add to dashboard Cite

T h i s paper presents a t h e o r e t i c a l model and an a s s o c i a t e d computer program f o r p r e d i c t i n g subsonic bending-torsion f l u t t e r i n prcpfans. The model i s based on two-dimensional unsteady cascade s t r i p t h e o r y and three-dimensional steady and unsteady l i f t i n g s u r f a c e aerodynamic t h e o r y i n c o n j u n c t i o n w i t h a f i n i t e element s t r u c t u r a l model f o r t h e blade. The a n a l y t i c a l r e s u l t s compare w e l l w i t h p u b l i s h e d experimental data. A d d i t i o n a l param e t r i c s t u d i e s a r e a l s o presented i l l u s t r a t i n g t h e e f f e c t s on f l u t t e r speed o f steady a e r o e l a s t i c deformations, b l a d e s e t t i n g angle, r o t a t i o n a l speed, number o f blades, s t r u c t u r a l damping, and number o f modes. N; a l s o d i s t a n c e f r o m t h e a x i s o f r o t a t i o n b l a d e l e n g t h along t h e r e f e r e n c e 1 i n e t i m e v e c t o r o f b l a d e d e f l e c t i o n s a t g r i d p o i n t s 1 v e c t o r o f steady s t a t e d e f l e c t i o n s a t g r i d p o i n t s steady s t a t e d e f l e c t i o n s due t o c e n t r i f u g a l loads steady s t a t e d e f l e c t i o n s a f t e r t h e i -t h i t e r a t i o nf r e e stream v e l o c i t y r e 1 a t i v e v e l o c i t y modal m a t r i x expressed i n terms o f i n d i v i d u a l bending and t o r s i o n c o n t r i b u t i o n s about t h e r e f e r e n c e a x i s bending c o n t r i b u t i o n s o f m normal modes o f t h e r e f e r e n c e a x i sF values a t f l u t t e r p o i n t S u p e r s c r i p t s d i f f e r e n t i a t i o n w i t h r e s p e c t t o t irne T transpose I d i f f e r e n t i a t i o n w i t h r e s p e c t t o s p a t i a l c o o r d i n a t e INTRODUCTION

show abstract

Flutter analysis of advanced turbopropellers

Cited by 9 publications

References 1 publication

Flutter Analysis of Propfan–Open Rotors

Flutter Analysis of Propfan–Open Rotors

Flutter analysis of propfans using a three-dimensional Euler solver

Analytical flutter investigation of a composite propfan model

Contact Info

Product

Resources

About