A Survey of Unsteady Hypersonic Flow Problems

A.R.C. C.P. No.901
Harch. 1%5
Wood, B. M.
A.R.C. C.P. NO.901
March, 1965
W o o d , 8. U.
A SURVEY OF UNSTEADY HYPERSONIC FL&’ PRoBUM A SURVEY OF UNSTEADY HYPERSONIC FWW PRXUXB
Arter glv,ng general lnronnatlo” on hypersonic rl”ws, rllghc condltlons lircer giving general im~ati0n on hypersonic riws. night .20”dltl0”3
and Vehicles. the repolZ ~‘evlews work on the analysis Of “nvteady hypersonic and vehicles. the report revlwa woe on the analysis of unsteady hypenonlc
fldws, analytical studies or the dy”e,!Mc stablllty or hypenO”lc vehicles, riw.9. a”alyt1ca1 studies 0r the dynamic stablllty or hypeno”lc PehlCl.%,
Bnd experlmentel and analytical work on rl”tter at hypersonic speeds. 0” and arperlmmtal and analytlcalwork on rlutter at hypersonic speeds. On
this bsSls it then examines the need r”r research and suggests lines that thls basis lt then examines the need ror research end su&ests lines that
research should rollow. research shollld r0lloA.
The chief conclusion 1s that the qwsl-steady analysis of unsteady
hypersonic fl‘ws may be adequate ror the practical purpOse.3 Of dynamic
stablllty and flutter analyals. ,It is s”&?zsted that research should be
directed to rlndlng the degl’ee or lnacc~recy involved I” quesl-Steady
estimates or the unsteady aemdynamlc forces. and the se”sltlvlty or
dynamic stablllty alYf rlurter analyses t” lnaccuracles I” these io,.Xs.
The tiler concl”slon 18 that the quasi-steady analysis or ““ste*dy
hypersonic rlows may be adequate rcr the practical purpcees or dy”amlc
.m.b*lity and riutm- analysis. It 1s suggeSted that research should be
directed to rlndlng the desee Or l”XCUIXCY Involved 1” quasi-Steady
estlmtes or the ““steady ae~le Iores. znd the 9elsltlrlty or
dynsmlC stablllty and rimer mlalyses to l”aCCuraCleS I” these rorce.9.
P.T.O. P.T.O.
A.&C. C.P. No.901
uamh. 1965
Wood, 8. U.
A SUIWEY OF UNSTEADY “YPERBONIC Fu;w PROEUHB
The chief conclusion 18 that the quasi-steady enalysls or unsready
hypersonic rim may be adsquare r0r the pl-act&J purposes or dynamic
stablllcy end riutter a”alys1s. It 1s suggested that research should be
directed to rl”dlng the degree or l”wcw.wy Involved 1” quesl-stesdy
estim.ma or the unsteady aerodynami0 r0me3, md t h e ~e~ltl~lty 0r
dynamic stablllty and rlutter analyses t” l”a”curscles in these rorces.
P.T.O.