Accession Number:

ADA136895

Title:

A Study of the Aerodynamic Interference Effects during Aerial Refueling

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1983-12-01

Pagination or Media Count:

100.0

Abstract:

This report investigated the feasibility of using an analytical approach and the vortex lattice method VLM to evaluate aerodynamic interference effects present during aerial refueling. While KC-10 tanker and a B-52 receiver were studied, the method applies to any tanker receiver combination. Major assumptions include linear potential flow tanker receiver are represented by wing planforms fuselage effects are small and the rolling- up process of the tankers wing tip vortices are not considered. The analytical approach uses a lifting line followed by a semi-infinite vortex sheet to represent the tanker. Three linear lift distributions for the tankers wing were used and equations were derived for the induced downwash at any point in space. Points on the receivers wing were selected to indicate the tankers effect on the receivers flowfield. Results of the analytical equations when compared with analytical predictions were found to overpredict the induced downwash by 25-35. VLM was used to study the effects of rectangular vs swept wings on induced downwash tanker tailplane on the receiver change of angle of attack of one aircraft due to the presence of the other and the presence of the tanker on th receivers pitching moment. VLM results varied from the Douglas prediction for induced downwash by only 5 and were even more accurate at lower tanker angles of attack.

Subject Categories:

  • Bombers
  • Transport Aircraft
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE