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THE BATTALION
WEDNESDAY, JULY 9, 1975
Page 7
!|
m.
Thursday
July 10 in the Grove
From 9 to Midnite
to
SOUTHBOUND”
I
Solution sought
for turbine surg
Turbines supply us with everything from light in our homes
to jet transportation. However, they are subject to a phenom
enon known as surge which can cause them to explode or dis
integrate.
A number of oil companies and Howell Instruments have
funded the Gas Turbine Laboratories at TAMU to develop
a surge warning device that could save industry thousands of
dollars.
Laboratory Director Dr. M. P. Boyce, said that “surge
consists of the reversal of flow in a compressor. Instead of the
air or water or whatever going in the correct direction, it goes
opposite. ”
A compressor can surge because of dirt or vibration. This
can destroy the bearings and cause unscheduled downtime of
the equipment.
If the surge-caused vibration gets violent enough it could
cause the turbine to throw the compressor blades and dis
integrate, Boyce said. “The same problem also occurs in air
craft turbines, and the research could be applied there as well.
“The program has as its main goal the design of a surge-
detection control device and a secondary goal of extending the
surge-to-stall margin in these compressors, which means in
creasing the operational range of the compressor.
“The device will increase compressor life and reduce costly
repair time while making the compressor more efficient,”
Boyce said.
Student developing
gas saving ideas
An aerospace engineering stu
dent at TAMU is developing ways
for truckers to save gas by cutting
drag on tractor-trailer rigs.
Robert Milburn, a senior from
San Angelo, has used the TAMU
wind tunnel to find five major areas
of high-drag conditions.
“Because fuel has been plentiful
and inexpensive, little attention has
been given to altering the shapes
and performance of trucks to reduce
fuel consumption,” Milburn said.
“Now, in order to return a profit to
the operator the trucks must oper
ate with minimum possible fuel
consumption.
“At highway speeds aerodynamic
drag is the major force on the
truck,” he said. “Before, the higher
drag was overcome by more power-
ful engines, resulting in increases in
fuel consumption. Efforts are now
being made to reduce aerodynamic
drag by reshaping the truck design
rather than using large engines.
“We have just finished the initial
phase of wind-tunnel testing to de
termine where the drag could most
easily be reduced,” Milburn said.
“Three models were tested: a con-
[ventional cab, a ‘cab-over-engine,’
jand a conventional cab with a
[sleeper.
“Five areas were found that pre
sented high drag conditions,” he
said. “The areas were: in front of the
radiator, between the tractor and
trailer, under the cab, behind the
trailer and under the trailer.
“The log-drag truck of the future
will have to be a streamlined body,
but the immediate need is for drag-
reduction devices that can be added
to existing vehicles,” Milburn said.
“The gap between the tractor and
trailer produces a very high drag,”
he said. “If the gap were sealed so
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that no air could enter, this problem
would be eliminated. The seal could
be made of canvas and could be at
tached by means of snaps on the
trailer and tractor. This would effec
tively seal the gap and would still
allow existing turning radii.
“At the rear of the trailer a device
is needed to reduce the wake be-
jhind the vehicle,” Milburn said.
[“This could be done by attaching a
[base plate a short distance behind
(the trailer. This device was tested
in the wind tunnel by taping a bottle
cap on the end of a rod and placing it
behind the trailer.
“Thus, the wake is smaller and
the forward flow of air behind the
trailer is greatly reduced, thereby
reducing the drag, he said.
“Another problem area is under
the trailer,” Milburn said. “One de
vice which might reduce the drag is
a flexible skirt attached under the
cab extending almost to the ground.
The air flowing under the cab would
be forced out to the side of the
truck. This would produce a low-
pressure region underneath the
trailer and the air would be forced
back under the vehicle.
“This would improve the flow
under the trailer; it woidd also con
tribute more flow into the wake be
hind the truck and would reduce the
spillover to the sides of the trailer,”
he said.
Submarine
probe shows
reef safe
A TAMU submarine research
team says its investigations of dril
ling operations near the East
Flower Garden Reef off Galveston
show “no evidence of mortality or
damage to biota of the bank that
could be attributed to drilling oper
ations.”
Dr. Thomas Bright, head of the
team, said he and his associates ran a
submarine transect from the crest of
the reef to the edge of the bank
nearest the drilling site.
“Now we’ve got to fill out a lot of
reports and do the analyses of the 1 '
material we’ve obtained,” Bright
said.
The team used the TAMU re
search vessel “Gyre” and the sub
“Diaphus to map oil lands on the
floor and continental slope of the
Texas Gulf of Mexico. The total sur
vey included areas from Galveston
to Corpus Christi.
The Bureau of Land Management
contracted with TAMU scientists to
map offshore fishing banks in areas
offered for auction to oil companies.
The results of the cruise will be
reported to the bureau for use in
regulating oil and gas drilling near
the banks.
The next scheduled dive for the
“Diaphus” is set for Sept. 15 in the
Gulf in conjunction with research
for the U.S. Geological Survey.
Bilingual
institute set
A group of junior and community
college instructors will assemble
next week at TAMU for a four-week
bilingual-bicultural teaching insti
tute.
The teachers are picked from
schools with 10 per cent or more
enrollment from bilingual-
bicultural background.
The institute, which begins to
morrow, is geared to intense train
ing of about 25 such instructors in
specific teaching methods.
If you want the real
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| Dallas location-, ’i
13071 Northwest Hwy.
1382-8570