slsi
ites ited’
“
cites
‘
Saat
ical
nett Sash
tind
etbieSiecet
eicbecctn
ramble dheasel th
sancti
ace tl
tion is presented (Reference 5) where the radius of complete evapora-
fic
Pena~—}
repent
saerae
"Pierre eonend
tion for rain is dependent only on charge weight.
Wis in lbs of TNT
ire
eon
nilets
ty
Cahatesanstotinernntaah
Where:
(4.1)
ce
The apparent yield obtained by BRL on the clear blast line was
fgp Kt.
This was established by use of the composite free air pres;sure curve and assuming the @W theory to be valid.
By the same method
uthe apparent yield on the Tare Complex was 110 Kt.
If 0.50 is used as
“the
WT blast equivalent energy and then the 2W theory applied for a
supfas ¢ burst, it gives an equivalent TNT yield of 150 Kt or 3.0 x
aprons—“,
testnanaein$
Seamemeeingy
i
“on
a
Ry = Se (wh/3yt-pg
10
Ips of TNT.
From Hartman's report (Reference 5) he predicts that
a charge weight ZW fired in clear weather gives the same shock energy
at a distanceR that a charge of weight W gives when fired in the
presence of fratn or fog.-
Theréfore, Z< 1 and is a function of R and W.
presented for Z is as follows:
fet
The equation
See
ZS —
9/a
(4,2)
28) 1-11.70 x 107 4 gil/3 |
a)
we
For calculatin St attenuation of pressure due to rain or fog
the usual procedure «tui: to choose a W and ¢ and calculate Z
versus R.
On this shot-the
lue of W along a clear line is known
and the values of pressure (Pr) along a rain blast line and the values
of pressure (P) along a cleay jline are known. ‘Therefore, the following procedure was used to detdrmine the amount of liquid water content
(c) present along the rain blast 1
substituted in Equation 4.2 and
First various values of c w
solved for Z.
When a value of Z w;
etermined for a particular ¢ it
was inserted in the following emperjical eguacion and checked for the
actual value of Pr obtained from thé
record.
This equation holds
rather closely between 4 and 20 psi basefljon TNT considerations.
Pr = p20
pac
In order to find the distance at sy
be completely evaporated, substitute (ZW)
(4.3)
iven rain drop will
pa
Equation 4.1 and
determine R,.
If the R used when substituting-+mm Equation 4,2 is
<Ry; then lhe value of Pris valid.
If R isi>R
athe assumption
is No longer valid because all of the water at that
tpnee has not
been evaporated.
3
i
A value of ¢ = 0.9 gm/m” seems to fit the experizient best and
it signifies that a rainfall of slightly less than 1 in/hr was falling
48
soar ash