NASA Technical Reports Server (NTRS) 19950003832: Flutter Analysis Of Supersonic Axial Flow Cascades Using A High Resolution Euler Solver. Part 1: Formulation And Validation - Info and Reading Options
By NASA Technical Reports Server (NTRS)
"NASA Technical Reports Server (NTRS) 19950003832: Flutter Analysis Of Supersonic Axial Flow Cascades Using A High Resolution Euler Solver. Part 1: Formulation And Validation" and the language of the book is English.
“NASA Technical Reports Server (NTRS) 19950003832: Flutter Analysis Of Supersonic Axial Flow Cascades Using A High Resolution Euler Solver. Part 1: Formulation And Validation” Metadata:
- Title: ➤ NASA Technical Reports Server (NTRS) 19950003832: Flutter Analysis Of Supersonic Axial Flow Cascades Using A High Resolution Euler Solver. Part 1: Formulation And Validation
- Author: ➤ NASA Technical Reports Server (NTRS)
- Language: English
Edition Identifiers:
- Internet Archive ID: NASA_NTRS_Archive_19950003832
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"NASA Technical Reports Server (NTRS) 19950003832: Flutter Analysis Of Supersonic Axial Flow Cascades Using A High Resolution Euler Solver. Part 1: Formulation And Validation" Description:
The Internet Archive:
This report presents, in two parts, a dynamic aeroelastic stability (flutter) analysis of a cascade of blades in supersonic axial flow. Each blade of the cascade is modeled as a typical section having pitching and plunging degrees of freedom. Aerodynamic forces are obtained from a time accurate, unsteady, two-dimensional cascade solver based on the Euler equations. The solver uses a time marching flux-difference splitting (FDS) scheme. Flutter stability is analyzed in the frequency domain. The unsteady force coefficients required in the analysis are obtained by harmonically oscillating (HO) the blades for a given flow condition, oscillation frequency, and interblade phase angle. The calculated time history of the forces is then Fourier decomposed to give the required unsteady force coefficients. An influence coefficient (IC) method and a pulse response (PR) method are also implemented to reduce the computational time for the calculation of the unsteady force coefficients for any phase angle and oscillation frequency. Part 1, this report, presents these analysis methods and their validation by comparison with results obtained from linear theory for a selected flat plate cascade geometry. A typical calculation for a rotor airfoil is also included to show the applicability of the present solver for airfoil configurations. The predicted unsteady aerodynamic forces for a selected flat plate cascade geometry and flow conditions correlated well with those obtained from linear theory for different interblade phase angles and oscillation frequencies. All the three methods of predicting unsteady force coefficients, namely, HO, IC, and PR, showed good correlations with each other. It was established that only a single calculation with four blade passages is required to calculate the aerodynamic forces for any phase angle for a cascade consisting of any number of blades, for any value of the oscillation frequency. Flutter results, including mistuning effects, for a cascade of stator airfoils are presented in Part 2 of the report.
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