Lift and moment coefficients expanded to the seventh power of frequency for oscillating rectangular wings in supersonic flow and applied to a specific flutter problem / Herbert C. Nelson, Ruby A. Rainey, and Charles E. Watkins.
Linearized theory for compressible unsteady flow is used to derive the velocity potential and lift and moment coefficients in the form of power series in terms of the frequency of oscillation for a harmonically oscillating rectangular wing moving at a constant supersonic speed. Closed expressions fo...
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| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
National Advisory Committee for Aeronautics,
1954.
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| Series: | Technical note (United States. National Advisory Committee for Aeronautics) ;
3076. |
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| Summary: | Linearized theory for compressible unsteady flow is used to derive the velocity potential and lift and moment coefficients in the form of power series in terms of the frequency of oscillation for a harmonically oscillating rectangular wing moving at a constant supersonic speed. Closed expressions for the velocity potential and lift and moment coefficients associated with pitching and translation are given to the seventh power of the frequency. These expresssions extend the range of usefulness of NACA Repror 1028 in which similar expressions were derived to the third power of the frequency of oscillation. For example, at a Mach number of 10/9 the expansion of the potential to the third power is an accurate representation of the potential for values of the reduced frequency only up to about 0.08; whereas the expansion of the potential to the seventh power is an accurate representation for values of the reduced frequency up to about 0.2, a value of this parameter large enough to cover most rectangular-wing flutter cases likely to occur at this Mach number. |
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| Item Description: | "April 1954." NACA TN Number 3076. |
| Physical Description: | 53 pages : illustrations ; 28 cm. |
| Bibliography: | Includes bibliographical references. |