M15.1 Flashcards

1
Q

Newton’s first law

A

Law of inertia

A body at rest remains at rest and a body in motion continues to move at a constant velocity unless acted upon by an unbalanced external force.

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2
Q

Kinetic energy equation

A

Kinetic Energy (KE) =.
È × Mass (m) × Velocity (22)

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3
Q

Potential energy equation

A

Mgy

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4
Q

What is potential energy

A

Energy stored when a body is at rest

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5
Q

What are the 2 types of energy

A
  • Potential
  • Kinetic
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6
Q

Newton’s second law

A

That the acceleration produced in a mass by a force acting on it is directly proportional to the force and inversely proportional to the mass.

Force = Mass x Acceleration

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7
Q

Newtons 3rd law

A

Every action has an equal and opposite reaction. This means that no matter what the circumstances, when one object exerts a force on a second object, the second must exert an equal and oppositely directed force on the first

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8
Q

What is energy defined as

A

Something that gives us capacity to do work

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9
Q

What is the brayton cycle

A

The Brayton cycle is the name given to the thermodynamic cycle of a gas turbine engine that produces thrust.

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10
Q

What are the 4 stages of the brayton cycle

A

This has four stages: intake (suck), compression (squeeze), expansion (bang), and exhaust (blow).

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11
Q

Acceleration due to gravity

A

9.81m/s squared

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12
Q

Engine cycle

A

Induction
Compression
Combustion
Exhaust

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13
Q

Isobaric heating

A

Increase in temperature at constant pressure

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14
Q

Isobaric

A

Constant pressure

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15
Q

Isochoric

A

Constant volume

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16
Q

Isothermal

A

Constant temperature

17
Q

Isentropic

A

Adiabatic and reversible

18
Q

What changes of state are important for gas turbine engines

A

Isobaric and isentropic

19
Q

Two types of aircraft engines

A

Piston type

Gas turbine

20
Q

Piston engine advantages

A

Fuel efficiency

21
Q

Piston engine disadvantages

A

High power to weight ratio

Performance loss at high altitudes

22
Q

Types of gas turbine engines

A
  • Turbojet
  • Turbofan
  • Turboprop
  • APU
23
Q

What is an engine that uses jet propulsion called

A

Reaction engine

24
Q

Parameters that determine thrust

A

Mass of ambient air

Amount of acceleration

25
Q

Four main environmental parameters that effect thrust

A
  • Ambient air pressure
  • Air temp
  • Altitude
  • Air speed
26
Q

At what altitude does ambient temperature and pressure stop decreasing

A

36000 feet

27
Q

Temp between 36000 and 57000 ft

A

-57c

28
Q

What engine uses 20% less fuel than high bypass engines

A

Prop fans

29
Q

Engine construction principles

A

Modular

Non modular

30
Q

Advantages of modular design for manufacturers

A
  • Rotating modules can be pre balanced
  • Less spare engines
  • Flexibiity to change individual parts
  • Easy storage and transport
31
Q

Advantages of modular designs for operators

A
  • Modules can be easily removed
  • No re-balanced after replacement
  • On wing changes
  • Less spares
32
Q

What is used to make N1 shaft

A

Steel alloy

33
Q

What is titanium based alloys used to build

A

Fan

HPC

34
Q

What is cobalt base alloy used to build

A

Turbine nozzle

35
Q

What is nickel based alloys used to build

A

HPT
LPT