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 Figure 10-14. Impulse Turbine
condition can change the pitch of the blades and render
the engine less efficient and dangerous to operate.
outward through the recouperator core into a collection
plenum that is connected to the vehicle exhaust duct.
Figure 10-13. Axial Flow Design
depending on engine size. These high rotational speeds
induce high-stress factors, which must be overcome for
safe and efficient operation. The turbine is constructed
of a disk and blades, each of which is carefully balanced
and weighed. The blades (sometimes called buckets)
are attached to the disk by a fir tree design (fig. 10-17).
This design provides for different rates of expansion
between blade and disk. The blades are attached axially
by fasteners or rivets (fig. 10-17). Turbine blades can be
open at the ends or constructed to form a shroud. The
Figure 10-15. Reaction Turbine
shroud is more desirable because of added strength and
additional air control. Turbine temperature must be
DISCHARGE VELOCITY INCREASED BY NOZZLE
monitored closely during operation. To exceed the
ACTION CAUSING REACTION WITH A COMPONENT
maximum operating temperature could result in changing
IN PLANE OF ROTOR ROTATION
the temper of the blades. This
TA233514
10-13
TM 9-8000
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