On the Interaction of Wall Jets and Fountain Formation.

reportActive / Technical Report | Accession Number: ADA081540 | Open PDF

Abstract:

An analysis of the fountain formation produced by the vertical impingement of two jets on a flat-ground surface is presented. A method has been developed for the determination of the upwash angle of the fountain in the plans of symmetry and the ground stagnation line. Comparison of the calculated results from the present analysis with tests data obtained by the Grumman Aerospace Corporation shows generally good agreement. The different methods of approach and results in some recent works regarding the upwash angle are discussed, and it is shown that the fountain should leave the ground surface in direction perpendicular to it, and approach the upwash angle asymptotically. Author

Author(s):
Yen, K. T.
Author Organization(s):
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIRCRAFT AND CREW SYSTEMS TECHNOLOGY DIRECTORATE
Descriptive Note:
Final rept.,
Pagination:
0024

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NADC-79275-60
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_1_Force Support
Communities of Interest:
Air Platforms
Descriptor(s):
*INTERACTIONS, *FLOW FIELDS, *JET FLOW, *AERODYNAMICS, *IMPINGEMENT, *POWERED LIFT, MATHEMATICAL MODELS, GROUND LEVEL, VISCOSITY, HOVERING, VERTICAL TAKEOFF AIRCRAFT, SHORT TAKEOFF AIRCRAFT
Field(s)/Group(s):
VSTOL, Fluid Mechanics
Keyword(s):
Fountain formation, Wall jets, LPN A320 3200 001A 9R02 302 000
Report Date:
1979 Sep 30