15.7 EXHAUST

Question 1

what is the function of the exhaust

Answer 1

guide the gasses into the atmosphere

Question 2

what are the components of the exhaust section

Answer 2

exhaust cone, tailpipe, exhaust nozzle

Question 3

what are 2 common ways of protecting the fuselage structure

Answer 3

insulation blankets, shrouds

Question 4

what are the insulation blankets also used for

Answer 4

prevent heat loss from the exhaust system

Question 5

what are the 2 types of nozzle design

Answer 5

converging, converging-diverging

Question 6

which nozzle is used for what speed of air

Answer 6

converging - subsonic, converging-diverging - supersonic

Question 7

on a gas turbine what shape is the core airflow nozzle

Answer 7

converging nozzle

Question 8

what does a converging nozzle do to the airflow and thrust

Answer 8

increases airflow and generates thrust

Question 9

the exhaust nozzle opening can be either

Answer 9

fixed or variable

Question 10

when is a variable exhaust nozzle used

Answer 10

when an afterburner is used

Question 11

explain the shape of the exhaust and what it does to the airflow

Answer 11

first part of exhaust is divergent to reduce turbulence, then it goes into convergent where velocity is increased providing thrust

Question 12

what are the 3 sources of noise from a gas turbine engine

Answer 12

air intake, vibration, exhaust

Question 13

what is the effective noise reduction for a turbojet

Answer 13

altering the exhaust nozzle shape

Question 14

what do thrust reversers do

Answer 14

deflect the airflow in the opposite direction

Question 15

what are the 4 types of thrust reverser

Answer 15

fan type, clamshell, bucket, pivoting door

Question 16

describe what aircraft clamshell reversers are used on and how they operate

Answer 16

older aircraft, pneumatically

Question 17

describe what aircraft bucket reversers are used on and how they operate

Answer 17

older aircraft, hydraulically

Question 18

what reverser is used on modern aircraft

Answer 18

fan reverser

Question 19

how does a fan reverser operate

Answer 19

pneumatically or hydraulically

Question 20

what block the air from going the wrong direction on fan reversers

Answer 20

blockers doors

Question 21

whats the other reverser used on modern aircraft

Answer 21

pivoting door

Question 22

how is the pivoting reverser operated

Answer 22

hydraulically

Question 23

whats a disadvantage of thrust reversers

Answer 23

can cause disturbed airflow through the engines

Question 24

what happens if thrust reverse is on at low speeds

Answer 24

the engine ingests its own air and causes severe compressor stall

Question 25

how is ingesting and aircrafts own thrust reverse air prevented

Answer 25

positioning the thrust reversers in opposite direction from engine intakes

Question 26

what do military jets use for manoeuvring in flight

Answer 26

thrust vectoring

Question 27

what thrust reversers would cascade vanes be on

Answer 27

clamshell