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M15✅ > 15.7 EXHAUST👌🏼 > Flashcards

15.7 EXHAUST👌🏼 Flashcards

(42 cards)

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1
Q

In general, the exhaust system does what?

A
  • guides exhaust gases from rear of turbine into atmosphere
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2
Q

On a jet engine, what is the exhaust system for

A
  • to accelerate airflow coming from turbine
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3
Q

What is the main task of the exhaust system in the turboprop engine

A

Safely guide exhaust gases overboard

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4
Q

What is the exhaust system of the APU for

A

Guides exhaust gases overboard because all the gas energy will be absorbed by the turbine

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5
Q

How is the APU noise of the exhaust system reduced

A
  • through mufflers in the exhaust duct
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6
Q

List the 3 components of the exhaust section

A
  • exhaust cone
  • tailpipe
  • exhaust nozzle
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7
Q

Explain the exhaust cone

A
  • collects exhaust gases from turbine section
  • velocity of gases is decreased slightly, pressure increases
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8
Q

What is the function of the radial hollow struts in the exhaust cone assembly

A
  • support inner cone
  • straightens swirling exhaust gases that would leave turbine at 45* angle
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9
Q

What is the function of the small hole located at the exit tip of the cone

A
  • cooling air circulated from the aft end of cone
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10
Q

The tail-pipe is usually constructed so that it is semi-flexible (T OR F)

A

T

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11
Q

What are the 2 suitable methods of protecting fuselage structure

A
  • insulation blankets (most common)
  • Shrouds
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12
Q

What does the insulation blanket consist of

A
  • several layers of aluminium foil separated by a layer of fibreglass
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13
Q

What is the primary reason of the insulation blanket

A

Reduce heat loss from exhaust system

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14
Q

What are the 2 types of exhaust nozzles

A
  • Converging (subsonic)
  • Converging-diverging (supersonic)
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15
Q

Why is there a converging nozzle before exhaust gases are discharged

A
  • so velocity can be increased
  • producing 15%-20% extra thrust
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16
Q

Turboprop exhaust nozzle produce how much thrust

A

10%-15%

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17
Q

The turboprop nozzle is mainly used for what

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A

Discharge exhaust gases from aircraft

18
Q

On turboprop, the exhaust nozzle is also referred as ?

19
Q

When would a variable area exhaust nozzle be used

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A
  • when augmenter or afterburner is used
    -due to increased mass flow when afterburner is activated
20
Q

Convergent duct increases gas velocity, therefore providing more thrust (T or F)

21
Q

Why would you use a convergent-divergent duct

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A
  • when EPR is high (>MACH 1)
  • more thrust can be gained
22
Q

In a C-D nozzle, what is the convergent section for

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A

Designed to handle gases while they remain subsonic

23
Q

In a C-D nozzle, what is the divergent section for

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A
  • further increases velocity
  • becomes supersonic
24
Q

What is the common type of noise suppressor used

Study These Flashcards
A
  • integral, airborne part of aircraft engine installation
  • engine exhaust nozzle
25
How is the noise produced by the engine exhaust
- caused by high degree of turbulence of high velocity jet stream
26
Large engines operating at partial thrust are less noisy than smaller engines operating at full thrust
True
27
What are the 2 types of noise suppressors
- corrugated perimeter type - multi- tube type
28
In the engine nacelle, the area between engine and the cowl has what
- acoustic linings (converts energy into heat) -
29
Explain the construction of the acoustic linings
- consist of porous skin supported by honeycomb backing
30
Explain thrust reverser
- braking force by deflecting exhaust gas stream in opposite direction
31
On modern turbofan engines which airflow is reversed
- fan airflow reversed as this creates most of the engines thrust
32
What are the 2 types of thrust reverser
- Clamshell - bucket
33
Explain clamshell type thrust reverser
- older jets with low bypass ratio - usually pneumatically operated by bleed air
34
Explain bucket type thrust reverser
- older jets with low bypass ratio - usually hydraulically operated
35
On turbofan engines what air is deflected to give reverse thrust
Fan air
36
Fan reversers are most commonly what type of thrust reverser
Cascade type
37
In a turbo fan what are the blocker doors function
- ensure all fan air is discharged through cascade vanes
38
How are the pivoting door reversers operated
Hydraulically
39
Why should you not use thrust reversers at low speeds
- Engine will ingest its own reversed airflow - Cause compressor stall and high EGT
40
At what speeds should thrust reversers be activated
- high speeds
41
To minimise disadvantages caused by reverser operation, the reversed airflow is matched to engine position .(T or F)
True
42
Explain thrust vectoring
- for manoeuvring in flight to change direction

M15✅ (16 decks)

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