UNIFIED PROPULSION: Learning Objectives:
Given the basic geometry and idealized component performance, to be able to estimate the thrust and
specific impulse of a gas turbine and a rocket engine from fluid and thermodynamic principles
Measurable outcomes (assessment method)
:
A.
To be able to explain at a level understandable by a high school senior or nontechnical person
what the various terms are in the integral momentum equation and how jet propulsion works.
(quiz, selfassessment)
B.
To be able to apply control volume analysis and the integral momentum equation to estimate
the forces produced by aerospace propulsion systems (homework, quiz, selfassessment)
C.
To be able to describe the principal figures of merit for aircraft engine and rocket motor
performance and explain how they are related to vehicle performance. (quiz, selfassessment)
D.
Given weight, geometry, and aerodynamic and propulsion system performance information, to
be able to estimate the power required for flight, the range, the endurance, and the timeto
climb for an aircraft.Ê (homework, quiz, selfassessment)
E.
Given mass fractions, and propulsion system performance information, to be able to estimate
the range and velocity of singlestage rockets. (homework and quiz, selfassessment)
F.
To be able to describe the principal design parameters and constraints that set the performance
of gas turbine engines, and to apply idealcycle analysis to a gas turbine engine to relate thrust
and fuel burn to componentlevel performance parameters and flight conditions. (homework,
quiz, selfassessment)
G.
To be able to explain at a level understandable by a high school senior or nontechnical person
the energy exchange processes that underlie the workings of multistage compressor or turbine,
and to be able to use velocity triangles and the Euler Turbine Equation to estimate the
performance of a compressor or turbine stage. (homework, quiz, selfassessment)
. Introduction to Propulsion
A. Goal: Create a Force to Propel a Vehicle
Two options
:
1.
Take mass stored in a vehicle and throw it backwards (
rocket propulsion
). Use the reaction
force to propel the vehicle.
Propellant >
burn
>
expand through
nozzle
(chem.
energy)
(thermal
energy)
(kinetic energy &
momentum)
Q1 (
PDF
)
2.
Seize mass from the surroundings and set the mass in motion backwards. Use the reaction
force to propel vehicle (
airbreathing propulsion
).
Continuously:
a) Draw in air.
b) Compress it.
c) Add fuel and burn (convert chemical energy to thermal energy).
d) Expand through a turbine to drive compressor (extract work).
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e.1) Then expand in a nozzle to convert thermal energy to kinetic energy &
momentum (turbojet).
e.2) Or expand in a second turbine (extract work), use this to drive a shaft for
a fan (turbofan), or a propeller (turboshaft). The fan or propeller impart k.e. &
mom. to the air.
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 Spring '09
 prof
 Velocity, Rockets, gas turbine engine, Euler Turbine Equation

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