THREE-DIMENSIONAL EFFECTS IN SONIC BOOM THEORY
Examining the validity and applicability in sonic boom calculations of (a) the Whitham-Walkden theory and (b) the first order approximation of a perturbation theory, based on the method of characteristics, it was found by Oswatitsch and Sun that the two methods yield different pressure signatures in the far field of a supersonic delta wing. The reason for the differences is discussed; by means of a simple procedure the reliability of both theories is compared in case they give different results. From these considerations it becomes evident that in the near field of planar systems the method under (b) should be used, that in the midfield a second order approximation is sometimes necessary, and that in the far field the Whitham-Walkden method is reliable and simple.
Technische Hogeschool Delft, NetherlandsDepartment of Aerospace Engineering
- Hendriks, TPM
- Publication Date: 1975-9
- Pagination: 41 p.
- TRT Terms: Airfoils; Approximation (Mathematics); Far field; Near field; Perturbation theory; Pressure; Reliability; Sonic boom; Three dimensional flow
- Old TRIS Terms: Delta wings; Method of characteristics; Pressure signatures; Supersonic; Whitham rule; Whitham-walkden theory
- Subject Areas: Aviation; Environment;
- Accession Number: 00154358
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: VTH-196
- Files: TRIS
- Created Date: May 31 1977 12:00AM