Far Field Conditions in Steady Flows with a Free Stream Mach Number One

Item

Title
Far Field Conditions in Steady Flows with a Free Stream Mach Number One
Date
1981
Index Abstract
Coming Soon
Photo Quality
Not Needed
Report Number
AFWAL TR 81-3064
Corporate Author
University of Dayton Research institute
Extent
66
Identifier
ADA102174
Distribution Classification
1
Contract
AFOSR 78-3524
DoD Project
2304
DoD Task
2304N1
DTIC Record Exists
No
Distribution Change Authority Correspondence
None
Abstract
The far field in a steady flow with a free stream Mach number one is governed by the potential equation simplified by the assumption that the deviations from a sonic parallel flow are small. In a suitable system of coordinates the dominant expression has the form of a similarity solution. To formulate far field conditions (conditions imposed by far field to the computed part of the flow field at its outer edge) one considers perturbations to the dominant part of the distant field. The particular solutions of the linear partial differential equation so obtained have also similarity form. The far field conditions express the requirement that only such perturbations are admitted which die out more quickly than the basic flow as one moves toward infinity. The derivation uses a Laplace form technique; the absence of nonadmissible particular solutions expresses itself by the absence of certain poles of the Laplace transform. These conditions are ultimately formulated in terms of quantities available in the physical plane. One obtains integrals extended over the outer contour of the computed flow field which contain the potential and its gradient.
Report Availability
Full text available by request
Date Issued
1981-06-01
Provenance
IIT
Type
report
Format
66 pages ; 28 cm.
Creator
Guderly, K. G.