Magnetohydrodynamics Energy Conversions:ME208

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Magnetohydrodynamics(Energy ConversionsME208)

• Suman Chandrawat (2001498)
• Dr. Sangeeta Kohli

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What is Magnetohydrodynamics?

• Magnetofluiddynamics
• Dynamics of electrically-conducting fluids and
  their interactions with magnetic fluids.

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• Important aspects of MDH
• 1. Accelerate fluids through Lorentz force J x B
  which refers to MHD accelerators.
• 2. Convert the kinetic energy of a fluid and its
  enthalpy into electric energy. This refers to MHD
  generators.

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Magnetohydrodynamic Waves

• Alfvén waves vibrations in the magnetic field
  lines.
• Fast magnetosonic waves
• Slow magnetosonic waves
• Properties of MHD waves depend upon the angle
  between the wave vector and the magnetic field

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Non-homogeneities in the field results

• Guided propagation of MHD waves
• Linear coupling of different MHD waves
• Phase mixing of Alfvén waves
• Resonant absorption
• Appearance of wave dispersion

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Magnetohydrodynamic (MHD) sensors

• Linear accelerometers
• Automotive safety research instrumentation
• Line of-sight (LOS) stabilization for handheld
  and platform mounted imaging systems
• Sensor controlled LOS stabilization
• Defense related space based pointing and tracking
  experiments

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Magnetohydrodynamic Power Generation

• Le Chatelier-Brown Principle
• MHD Generators
• MHD Turbines
• MHD Power Plants

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MHD Generators

• Faraday Magnetohydrodynamic Generator

Hall Magnetohydrodynamic Generator
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Plasma-driven MHD generators

• Open cycle MHD generators
• Involves the use of combustion products seeded by
  alkaline compounds such as potassium carbonate
• A closed cycle MHD generator
• Involves an inert gas which is heated in a high
  temperature heat exchanger of the ceramics pebble
  or cored-brick type and seeded with an alkaline
  metal such as cesium vapor.

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MHD Turbines

• Mobile power sources
• powered by hydrogen produced by veneered algae on
  desert hydrogen farms.

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MHD Power Plants

• Can generate electricity without using the
  conventional turbo-alternator
• Offer the prospect of more efficient use of coal
  for power generation

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MHD Developmental Status

• Coal fired MHDs
  Natural Gas Fired MHDs
• Nations involved
• USA
• Former USSR
• Japan
• India
• China
• Australia
• Italy
• Poland
• Yugoslavia

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• Thank you!