問題一覧
1
Thrust in a gas turbine engine is produced by
Compressor (increase air pressure) and Combustor (increase gases acceleration
2
......... always maintain high pressure compressor speed constant.
Governor
3
As altitude increase air pressure (density) & temperature
decrease
4
Lower temperature gives
greater mass flow and greater thrust
5
The turbofan mixture of a
turbojet and a turboprop, literally handles a hot air mass and a cold air mass
6
At 400 knots Ram effect
increase
7
......... drives the output shaft which drives propeller in turbo-prop engine and rotor in turbo-shaft engines
Free turbine
8
Newton’s 2nd law used
to calculate the amount of thrust produced by the engine
9
the working cycle of the heat engine
as constant-pressure cycle
10
A high bypass engine is more efficient because it is similar to the
to the propeller by accelerating large mass of air at a low rate of acceleration
11
Pressure in combustion chamber
virtually constant.
12
Aircraft altitude & ambient temperature
affect the inlet air density.
13
By pass ratio 5:1
indicates that bypass flow is five times the hot stream
14
.... thrust increase with small increase in RPM
At higher engine speeds
15
The highest air pressure
at compressor outlet
16
Gas turbine engine efficiency increases at altitude
due to drag decrease
17
Thrust can be increased by increasing
increasing air mass flown to engine or gases acceleration through the engine
18
The rocket is
a non-air breathing engine means it does not use atmospheric air to support combustion
19
The specific fuel consumption
thrust produced per pound of fuel consumed
20
ESHP
= SHP + Jet Thrust Addition of SHP to jet thrust. 1hp=745.7
21
Easier starting (the small.... needs to be rotated by the starter
HP compressor only
22
Pulse Jet
it has additional spring loaded valves in the air intake
23
2nd digit represent to
engine core air
24
Propulsive efficiency
is the ability of engine to drive the aircraft in flight
25
..... is gas coupling with compressor.... mechanically connected.
Free turbine¬
26
As temperature increase air density decrease
which negatively effect engine thrust and vice versa
27
1st digit represent the
bypass air
28
gas inside the combustion section of gas turbine engine
reduce from front to rear
29
The output of the engine when the aircraft in flight is called
net thrust