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Low and High Speed STOVL Configurations in Ground Effect by Nasa Technical Reports Server (Ntrs), James D. Holdeman, Thomas J. Vukits

Low and High Speed STOVL Configurations in Ground Effect

by Nasa Technical Reports Server (Ntrs) , James D. Holdeman , Thomas J. Vukits
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Book cover type: Paperback
  • ISBN13: 9781287266778
  • Binding: Paperback
  • Subject: N/A
  • Publisher: Bibliogov
  • Publisher Imprint: Bibliogov
  • Publication Date:
  • Pages: 174
  • Original Price: GBP 15.99
  • Language: English
  • Edition: N/A
  • Item Weight: 323 grams
  • BISAC Subject(s): General

The problem of hot gas ingestion in V/STOL and STOVL aircraft has motivated a set of experimental studies. Two-, three-, and four-jet configurations in cross flow were studied in ground effect. The results presented here were based on a quantitative, concentration measurement technique know as marker nephelometry. The effects of configuration, velocity ratio (freestream over jet velocity), model height, and inlet suction were investigated. The experiments were conducted in three parts. In the first part, comparisons of low speed two-, three-, and four-jet configurations were made. Measurements were made in the planes beneath the models in ground effect. As the number of jets increased, the vortical structures in the flowfield were found to move further upstream due to the increased total momentum. In the second part of the experiments, measurements were made at the inlet entry plane of the low speed two- and three-jet configurations in ground effect. The results indicated that ingestion occurred intermittently, especially in the upper portions of the inlets. The highest levels of concentrations were measured at a model height of two jet diameters. As the model height increased, the concentration levels decreased. Finally, a high speed, two-jet configuration without inlet suction was studied. The flowfield structures were generally found to move further downstream as the jet velocity increased at a constant velocity ratio.

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