This preview shows page 1. Sign up to view the full content.
1
MAE 112 Propulsion
Homework Assignment #8
Due: Wednesday, March 10, 2010
1. Consider a crossedfield twodimensional electromagnetic accelerator. Argon gas with
molecular weight of 40 and
= 5/3 is the propellant. The gas temperature (
T
= 8750 K)
and the crosssectional flow area are constant with downstream distance. The electric
field is directed transverse to the flow with
E
= 6300 volts per meter.
.
The conductivity
= 1900 per ohmmeter.
Note that one weber = Newtonsecondmeter per coulomb;
one ohm = voltsec per coulomb; and one joule = Newtonmeter = voltcoulomb.
Hall
current is negligible here. At the position in the flow where the velocity
u
= 40,000
meters per second, determine
a) the magnetic field
B
in units of webers per square meter;
b) the current density
j
in units of coulombs per meter squared per second; and
c) the Lorentz force in units of newtons per cubic meter.
2.
This is the end of the preview. Sign up
to
access the rest of the document.
 Winter '09
 LaRue

Click to edit the document details