ON THE CENTERLINE POSITION OF A SUPERSONIC JET IN A SUPERSONIC STREAM AT AN ANGLE OF ATTACK,
Abstract
The inclination of the centerline of a supersonic jet in a supersonic stream is studied from numerical calculations based on a theory of the author and T. Strand. For a two dimensional jet, the centerline is a piecewise linear function of the axial variable depending upon a single parameter containing the Mach numbers and dynamic pressures of the two streams. For relatively small values of this parameter, most of the turning takes place close to the jet exit. Unlike the two dimensional jet, the axially symmetric jet does not necessarily align itself with the exterior stream far downstream of the exit. For a vanishingly short engine, the jet approaches the direction of the outside stream only when the dynamic pressure of the outside stream is very large compared to that of the jet. When the jet and outside streams are identical, the jet stream from a vanishingly short engine turns immediately to one half the angle of attack of the outside stream and remains almost straight. For the limiting case of an infinite length jet engine, the jet is undeflected by the outside stream. One important feature of the supersonic jet in a supersonic stream at an angle of attack is the dominating influence of engine length on the jet direction. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1968
- Accession Number
- AD0675384
Entities
People
- F. Edward Ehlers
Organizations
- Boeing