The document discusses turboshaft engines. It explains that turboshaft engines are a type of gas turbine optimized for shaft power rather than thrust. They are commonly used in helicopters, ships, tanks, and other applications requiring sustained high power output. The key components of a turboshaft engine are the compressor, combustion chamber, turbine, and gearbox. The compressor increases air pressure, the combustion chamber adds energy through combustion, the turbine extracts power, and the gearbox transfers power to the rotors or propellers. Recent tests show that GE's new turboshaft engine is meeting fuel burn and maintenance cost reduction targets.

1. TURBOSHAFT ENGINE
Presented
by
THIRUMALVALAVAN
B.TECH-AEROSPACE
AMITY UNIVERSITY
2013-2017

2. • A turboshaft engine is a form of gas turbine which is optimized to produce
shaft power rather than jet thrust.
• Turboshaft engines are very similar to turbojets and turboprop.
• Turboshaft engines are commonly used in applications that require a sustained high
power output, high reliability, small size, and light weight. These
include helicopters, auxiliary power units, boats and ships, tanks, hovercraft, and
stationary equipment.
TURBOSHAFT ENGINE

3. PRINCIPLE
• All jet engines, which are also called gas turbines, work on the same principle.
The engine sucks air in at the front with a fan.
• The burning gases expand and blast out through the nozzle, at the back of the
engine. As the jets of gas shoot backward, the engine and the aircraft are thrust
forward. As the hot air is going to the nozzle, it passes through another group of
blades called the turbine.
• The turbine is attached to the same shaft as the compressor. Spinning the turbine
causes the compressor to spin.

4. How does the power get from the engine to the rotors?
• The power is transferred from the engine using a main gearbox which changes the
power from the engine and sends it to the transmission.
• In the transmission RPM is reduced from thousands of RPM to hundreds of RPM.
By doing this the torque is increased and the rotation is slowed to an acceptable
level for the rotor system.
• The transmission drives the mast which gives direct rotation to the rotors. Often
another shaft will come out of the transmission to directly drive the tail rotor as
well.
• An accessory gearbox mounted on the engine draws little engine power to drive
things like the oil pump, the generator and the fuel control for the engine itself.

5. STAGES IN TURBOSHAFT ENGINE
• Gas compressor: A gas compressor is a mechanical device that
increases the pressure of a gas by reducing its volume. An air
compressor is a specific type of gas compressor.
Axial flow compressor

6. • Combustion chamber: The combustion process increases the internal
energy of a gas, which translates into an increase in temperature, pressure, or
volume depending on the configuration.
For example a jet engine combustor, the pressure is controlled and the
combustion creates an increase in volume. This increase in pressure or volume can
be used to do work. If the gas velocity changes, thrust is produced, such as in
the nozzle of a rocket engine.
Combustion chamber of jet engine

7. •Nozzle: A nozzle is a device designed to control the direction or characteristics
of a fluid flow (especially to increase velocity) as it exits (or enters) an enclosed
chamber or pipe.
Nozzles are frequently used to control the rate of flow, speed, direction, mass,
shape, and/or the pressure of the stream that emerges from them. In nozzle
velocity of fluid increases on the expense of its pressure energy.

8. • Turbine: A turbine is a turbo machine with at least one moving part
called a rotor assembly, which is a shaft or drum
with blades attached. Moving fluid acts on the blades so that they
move and impart rotational energy to the rotor.

9. • Gear box: A transmission is a machine that consists of a power source
and a power transmission system, which provides controlled application of
the power. Often the term transmission refers simply to the gearbox that
uses gears and gear trains to provide speed and torque conversions from a
rotating power source to another device.

10. RECENT ACTIVITIES
• The new GE -8 turbo shaft has completed component tests and is being run as a
full unit. The engine will have a five-stage axial flow compressor followed by a
last-stage centrifugal. It will have a pressure ratio of 18.6. The target is for the
new turbo shaft to have a 20 percent lower fuel burn and a 30 percent lower
maintenance cost. The GE unit will benefit from the military funding in the
development of the GE 38 designated for the new US Marine Corps Sikorsky CH-
53K Super Stallion helicopter. Tests show that the targets are being met.
GE3000 TURBOSHFT ENGINE