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NASA Langley Research Center's Hydraulic Catapult: Airplane Acceleration Equation, Exercises of Applied Thermodynamics

Information about a problem related to the unified engineering course at spring term 2003, where students are asked to explain the terms in an equation of motion for an airplane using nasa langley research center's hydraulic catapult as an example. The problem also asks students to derive an equation of motion for the airplane's acceleration and determine the thrust on the airplane.

Typology: Exercises

2011/2012

Uploaded on 07/20/2012

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Unified Engineering Spring Term 2003
Problem P2. (Propulsion)
There is a test facility at NASA Langley Research Center where a hydraulic catapult is
used to accelerate vehicles. It provides an instructive illustration of the integral
momentum theorem.
V
Nozzle
S
1
V
j
, A, ρ
Mass of
Airplane, M
F
S
2
V
j
V
j
T
Bucket
- V
- V
a) Explain what each term in the equation of motion represents.
b) Derive an equation of motion for the airplane acceleration (dV(t)/dt) as a function of
the velocity, area, and density of the water jet (Vj, Aj and ρj respectively), and the mass
(m) and velocity (V) of the airplane. Neglect the effects of gravity and assume the forces
associated with the air around the vehicle and launcher are small compared to those
associated with the water jet. Assume the mass of water in contact with and accelerating
the bucket is negligible relative to M so you can neglect any change with time of the
momentum of the jet within the control volume.
c) What is the thrust, T, on the airplane?
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Unified Engineering Spring Term 2003

Problem P2. (Propulsion)

There is a test facility at NASA Langley Research Center where a hydraulic catapult is used to accelerate vehicles. It provides an instructive illustration of the integral momentum theorem.

V

Nozzle

S (^1)

Vj , A, ρ

Mass of Airplane, M

F

V (^) j S 2

V (^) j

T

Bucket

  • V
  • V

a) Explain what each term in the equation of motion represents.

b) Derive an equation of motion for the airplane acceleration (dV(t)/dt) as a function of the velocity, area, and density of the water jet (Vj, Aj and ρj respectively), and the mass (m) and velocity (V) of the airplane. Neglect the effects of gravity and assume the forces associated with the air around the vehicle and launcher are small compared to those associated with the water jet. Assume the mass of water in contact with and accelerating the bucket is negligible relative to M so you can neglect any change with time of the momentum of the jet within the control volume.

c) What is the thrust, T, on the airplane?

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