Exam 3 Questions Flashcards
In the inlet of a turbofan engine, the air ___________ and the pressure ____________
Slows / Increases
Exhaust gases turn a “free turbine” and power is measured by torque instead of thrust
Turboprop
Powers a gearbox or other device instead of producing thrust
Turboshaft
Has an inlet fan that begins the low pressure compression and may process bypass air
Turbofan
Produces the most thrust and noise than other aircraft turbine engines
Turbojet
The amount of force or thrust generated depends on the _________ of air moved through the engine and the extent of its ___________.
mass; acceleration
The force of the exhaust gases developed is a function of ____________.
Newton’s second law
The simplest of jet engines is the __________.
Ram Jet
Order the sections of a typical turbine engine in order from front to back.
Inlet N1
Compressor N2
Combustion
Turbine
Jet Nozzle
In a high-bypass Turbofan engine, as much as ____% of inlet air never goes through the engine core.
85%
What powers the N1 fan section?
First set of turbines in the turbine section of the engine.
The force of gravity on earth is _______.
32.2 ft./s2
The fan diameter of a turbofan is much _______ than a propeller but there are _________ blades and it has a higher ____________.
Smaller/More/Speed
The N1 and N2 sections are connected and spin at the same speed. T or F?
False
The basic cause of a compressor stall is _______?
Separation of air flow from the compressor blades
The Wa a turbine engine can process is most directly affected by _________.
Density
Thrust of a turbine engine decreases with altitude. T or F?
True
A turbine engine must be designed to operate in a wide range of ________ and ____________.
Temperatures; speeds
The relationship with fuel flow and altitude is?
It goes down as altitude goes up
What happens to airflow in the inlet of a turbine engine?
Velocity decreases and pressure increases
The result of Ram Effect is __________?
Wa is effectively increased
At low engine RPM’s thrust increases are _______ even with large increases in throttle/RPM’s
Small
T=Q(V2-V1) is an expression of what law of physics relative to thrust produced in turbine engines
Newton’s 2nd law
An auxiliary power unit “APU” is what type of turbine engine (hint: it doesn’t produce thrust - it drives something else)
Turboshaft
The airflow through the compressor section of a turbine engine is typically either ____________ flow or __________ flow
centrifugal; axial
The pressure of the airflow at the burner section has ________ pressure and _________ velocity than at the exit of the compressor section
Less/Greater
In about 100 B.C. in Egypt the ________ was developed
Aeolipile
The developer of the Stamping Mill was
Giovani Branca
A big invention in 1687 by Isaac Newton was the __________.
Steam Wagon (Horseless Carriage)
The first patented turbojet engine was in ___________.
1930
Frank Whittle took his turbine ideas from the work of ___________.
Sanford Moss
