3a part2

26問 • 2年前

問題一覧

On a multi-spool engine, the low-pressure compressor (N1) will ___________ (speed up or slow down) with an increase in altitude.

speed up

What two factors determine the angle of attack of a compressor blade? a. ___________ b. ___________

inlet air velocity, compressor rpm

Compressor stalls may cause the air flowing in the compressor to __________, or stagnate. In some cases the air may reverse direction.

slow down

Design factors which contribute to the prevention of compressor stalls include: a. __________ b. __________ c. __________

variable inlet guide vanes, bleed valves, variable stator vanes

The special set of vanes located at the discharge end of the compressor form the outlet vane assembly. The purpose of this assembly is to help straighten the airflow and eliminate any __________.

swirling

To take advantage of the good points of both the centrifugal flow and axial flow compressors, some engines may use a __________ compressor.

High temperature, high pressure air taken from the compressor for various purposes is known as __________air.

hybrid

Some current applications of bleed air are: a. __________ b. __________ c. __________ d. __________ e. __________

cabin pressurization, heating, cooling, de-icing and anti-icing, pneumatic engine starting

The section of a turbine engine directly behind the compressor is known as the __________.

diffuser

The pressure in the __________ section of a gas turbine engine is the highest of any section in the engine.

diffuser

As primary air flow enters a combustor, it passes through a set of __________ __________, which give the air a radial motion.

swirl vanes

The three types of combustion chambers that may be found in turbine engines are: a. __________ b. __________ c. __________

multi can, can annular, annular or basket type

Annular combustors which reverse the direction of the airflow are __________ combustors.

reverse flow

The two types of flameout that can occur in a gas turbine engine are refered to as: a. _________ b. _________

lean die out, rich blow out

Approximately _________ (what percentage) of the total pressure energy from the exhaust gasses is absorbed by the turbine section is used to turn the compressor and drive the accessories.

60-80

What are the two functions of the turbine nozzle? a. _________ b. _________

convert some of the exhaust gases pressure energy into velocity energy, direct the flow of exhuast gasses to strike the turbine rotor at the correct

When turbine blades are installed on a turbine disk, the unit is known as a turbine _________.

wheel

The most common method of attaching turbine blades to the disk is the _________ _________method.

fir tree

The three classifications used to describe turbine blades are: a. _________ b. _________ c. _________

impulse, reaction, impulse-reaction

Turbine blades may be open or _________ at their tips.

shrouded

The primary air, or the air that enters into the combustion process, amounts to about _________ percent of the total air that flows through a gas turbine engine.

The jet nozzle imparts a final __________(increase or decrease) in the velocity to the gases.

increase

Afterburning can produce as much as a 100% increase in thrust, with fuel flows increasing by __________ to __________ times.

3, 5

Turbofan engines __________ (often or seldom) require noise suppression.

seldom

Gas turbine engine rotors are usually supported by either __________ or __________ (what type) bearings.

ball, roller

The turbine of a turboprop engine extracts up to __________ percent of the engines total power output to drive the propeller.

CHAPTER 1A

Dorian Pinuellas · 53問 · 2年前

CHAPTER 1A