Analytical investigation of critical phenomena in MHD power generators
Critical phenomena in the Arnold Engineering Development Center (AEDC) High Performance Demonstration Experiment (HPDE) and the US U-25 Experiment, are analyzed. Also analyzed are the performance of a NASA-specified 500 MW(th) flow train and computations concerning critica issues for the scale-up of MHD Generators. The HPDE is characterized by computational simulations of both the nominal conditions and the conditions during the experimental runs. The steady-state performance is discussed along with the Hall voltage overshoots during the start-up and shutdown transients. The results of simulations of the HPDE runs with codes from the Q3D and TRANSIENT code families are compared to the experimental results. The results of the simulations are in good agreement with the experimental data. Additional critica phenomena analyzed in the AEDC/HPDE are the optimal load schedules, parametric variations, the parametric dependence of the electrode voltage drops, the boundary layer behavior, near electrode phenomena with finite electrode segmentation, and current distribution in the end regions. The US U-25 experiment is characterized by computational simulations of the nominal operating conditions. The steady-state performance for the nominal design of the US U-25 experiment is analyzed, as is the dependence of performance on the mass flow rate. A NASA-specified 500 MW(th) MHD flow train is characterized for computer simulation and the electrical, transport, and thermodynamic properties at the inlet plane are analyzed. Issues for the scale-up of MHD power trains are discussed. The AEDC/HPDE performance is analyzed to compare these experimental results to scale-up rules.
- Research Organization:
- STD Research Corp., Arcadia, CA (USA)
- DOE Contract Number:
- AI01-77ET10769
- OSTI ID:
- 6720834
- Report Number(s):
- DOE/NASA/0179-1; NASA-CR-165143; STDR-80-22
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
300101 -- MHD Generators-- Design & Development
300102* -- MHD Generators-- Performance & Testing
BOUNDARY LAYERS
COMBUSTORS
COMPUTER CALCULATIONS
COMPUTERIZED SIMULATION
CURRENTS
DATA
DATA ANALYSIS
DIMENSIONS
DIRECT ENERGY CONVERTERS
DISTRIBUTION
EFFICIENCY
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRODES
ENERGY TRANSFER
EXPERIMENTAL DATA
FLOW MODELS
FLOW RATE
FLUID MECHANICS
FRICTION
GRAPHS
HALL EFFECT
HEAT TRANSFER
HYDRODYNAMICS
INFORMATION
LAYERS
MACH NUMBER
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MATHEMATICAL MODELS
MECHANICS
MHD CHANNELS
MHD GENERATOR AEDC
MHD GENERATOR U-25
MHD GENERATORS
NUMERICAL DATA
OPTIMIZATION
PARAMETRIC ANALYSIS
PERFORMANCE
PERFORMANCE TESTING
PLASMA
PLASMA SEEDING
PRESSURE GRADIENTS
SCALING LAWS
SHUTDOWNS
SIMULATION
SKIN EFFECT
SPATIAL DISTRIBUTION
STAGNATION
START-UP
STEADY-STATE CONDITIONS
TABLES
TEMPERATURE DISTRIBUTION
TESTING
THEORETICAL DATA
THERMAL EFFICIENCY
TRANSIENTS
VELOCITY
VOLTAGE DROP