Appeal 2007-0113
Application 10/353,776
is a term of degree. Appellants’ Specification provides no other hint
as to what is meant by “substantially uniform.”
6. Appellants’ Specification provides no working examples of
Appellants’ invention.
7. Crow discusses an investigation directed to the problem of jet noise
and, in particular, a study of whether jet turbulence is orderly in any
sense, and whether the order can be enhanced and controlled by
periodic surging imposed at the jet exit (Crow 548). Crow does not
disclose optimizing thrust per se.
8. Crow investigates the effects of Strouhal number, St=fD/Uo, on
amplification of velocity at organized modes triggered by background
turbulence, where f is the frequency of induced oscillations or puffs
(Crow 556), and finds that a Strouhal number of 0.30 yields the
highest accessible amplitude (Crow 550).
9. Crow also studies how the jet responds to periodic forced surging at
Strouhal numbers ranging from 0.15 to 0.60 (Crow 560, Table 3). We
understand the Strouhal numbers of periodic forced surging to be
calculated using the surging frequency f, which corresponds to
Appellants’ frequency f=1/T, where T is the period between two
adjacent surges or pulses. According to Crow, “[t]he mode having a
Strouhal number of 0.30 is preferred in the sense that it can obtain the
highest possible amplitude under the combined effects of linear
amplification and non-linear saturation” (Crow 567-568). Crow
concludes from the study that “the preferred mode having a Strouhal
number of 0.30 is in some sense the most dispersive wave on a jet
column, the wave least capable of generating a harmonic, and
7
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Next
Last modified: September 9, 2013