Effects of Temperature Nonuniformity on Scramjet Engine Driven

1
Effects of Temperature Non-uniformity on
Scramjet Engine Driven DCW-MHD Generator of
Experimental Scale Toru Takahashi, Takayasu
Fujino and Motoo Ishikawa University of
Tsukuba, Japan
2
Concept of MHD power generation for hypersonic
vehicle
Self-contained combustion-driven MHD power system
Scramjet driven MHD power system
3
Experimental aspect
Experimental-scale Scramjet Combustor
Operating conditions
Magnet
4
Objectives
To clarify influence of inlet temperature
non-uniformity on generator performance
To investigate dependence of generator
performance on load condition under non-uniform
inlet temperature condition
5
Inlet temperature condition
Average 2350 K
Average 2250 K
6
Electrode potential
54.6 kWe
22
42.6 kWe
7
Electrode potential
8
Dependence of generator performance on load
condition
Load current 10 A to 70 A
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Dependence of flow field and electric field on
load condition
Generator Region
Nozzle
Nozzle
Generator Region
Nozzle
Nozzle
Load current
Load current
Load current
10
Relations of thrust loss and electric power
output to load condition
11
Relation between electric current and power output
Iload10 A
Electric field balances electromotive force by
optimizing load condition.
x-component of electric current density becomes
zero.
12
Dependence of x-component of current density on
load current
Nozzle
Nozzle
Generator Region
70 A
10 A
13
Dependence of y-component of current density and
Lorentz force on load current
Nozzle
Generator Region
Nozzle
Law of conservation of current
70 A
10 A
Generator Region
Nozzle
Nozzle
70 A
10 A
14
Relation among work against Lorentz force and
electric power output, and Joule dissipation
Joule dissipation
Work against Lorentz force
Electric power output
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Conclusions
Electric power output under non-uniform inlet
temperature condition is lower than electric
power output under uniform inlet temperature
condition.
Thrust loss monotonically decreases with increase
in load current, and electric power output has a
peak to load current.