A REVIEW OF THE THEORY OF TRAILING EDGE NOISE. CONTRACTOR REPORT

Literature on the theory of the generation of sound by the interaction of low Mach number turbulent flow with the edge of a semi-infinite rigid plate is critically reviewed. Three different approaches to the subject are identified, consisting of theories based on (1) Lighthill's acoustic analogy; (2) the solution of special, linearized hydroacoustic problems; and (3) ad hoc aerodynamic source models. When appropriately interpreted, all relevant theories produce essentially identical predictions in the limit of very small Mach numbers. None of the theories discusses the implications of the Kutta condition, however, nor of the effect of forward flight and source motion relative to the trailing edge. An outline of a redevelopment of the theory is included to give a unified view of the problem, exhibit the significance of the various approximations, and incorporate the effect of mean motion and of the Kutta condition.

• Corporate Authors:

  Bolt, Beranek and Newman, Incorporated

  50 Moulton Street
  Cambridge, MA  United States  02138
• Authors:
  • Howe, M S
• Publication Date: 1978-6

Media Info

• Pagination: 67 p.

Subject/Index Terms

• TRT Terms: Acoustic generators; Acoustic measuring instruments; Acoustics; Aerodynamic noise; Airfoils; Boundary layer; Boundary layer flow; Flow; Sound transmission; Trailing edges; Turbulence; Turbulent boundary layer
• Candidate Terms: Turbulent flow
• Old TRIS Terms: Acoustic measurements; Airfoil profiles; Flight mechanics; Kutta-joukowski condition; Lighthill method; Sound generators
• Subject Areas: Aviation; Vehicles and Equipment;

Filing Info

• Accession Number: 00185748
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: NASA-CR-3021, BBN-3679
• Contract Numbers: NAS1-14611
• Files: TRIS
• Created Date: Dec 29 1979 12:00AM