Study of power-jet dynamics in fluid amplifiers

122 Pages·2017·13.12 MB·English

by  R. C. Sekhar

Lehigh University
Lehigh Preserve
Theses and Dissertations
1972
Study of power-jet dynamics in fluid amplifiers
R. C. Sekhar
Lehigh University
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Recommended Citation
Sekhar, R. C., "Study of power-jet dynamics in fluid amplifiers" (1972).Theses and Dissertations. 4051.
https://preserve.lehigh.edu/etd/4051
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pivotally oscillated at the point of entry was studied
annlytically and experiner.tally. 'I'he e:{perimentally
observed velocity of the pro1Jofatinr cisturbances is
n1uch less than the velocity of the jet itself·. ThP. ratio
decreases for decreasinr Strauhal numbers for a riven
R·eyn:o:,l.d·s number of the flov.;. In the linear re-gion near
t-he. n·ozz.le the amplitude gr:ov1:s a 1-:l:ttle "f~s-te:r than lin
early ifi mo~t cases~
\i.ri,th thes:e resu·Its --e.x.c,e··pt that a rnuc.:h .fas.t-er grovit·h- rate-
i~l- p.:·:r.edicted,. Ini tj~:,ai r.esu.lts a tr1.e.o,ry· v1hicb irttr.c;,
of
ciu.c.es· vi,scos·r_·t;y ·via :a·n a,-s:s-um·.e.d, rn:o·del f·o:r t·he velcrcit_y .d:ec.ay-
,an·ct en.trai_nmeil.t· of th'e_'. jie:t, sµ.g_g.e:·.$.t ttrat the·se· :ado~ci: :eff:e.c·t,.s
:suppr.ess ·the grcvrth, r-a_te.·· ·P. . ·bet-te·r ·model for trte v,e1ooit.y-
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- ··~,- and-"en-trainment of -the jet v.1as ,.deduced, inc.lud·inr v-iall
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effects 1-ri-the thlrd di-men-sJ.-on, Vlh.ich :ma.y· lea·d tovrard a
more definitive inaiysis.
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i-i Thesis
}resented to the Graduate Co~~ittee
of Lchifh University
i.n ·C·andidacy for the Legree of·
I.-iaster of Science .~
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Reynolds nunter of the flov,. I~ the linear region near
t}1e nozzle trie ar;1-ol i tu de -Frows a little faster than lin-
early in most cases.
An idealized inviscid analysis aerees· qualitati.vely
with these results exo~pt that a nuch faster
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i·s predicted. .Lnitial .results of a the:.t>.r·~r v.;hich intro-
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suppre.t;s the gr-ov:t'h .rat-~·.
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