MAGNETOHYDRODYNAMIC (MHD) generation of power is the direct conversion of heat into electrical energy.In this method gases at about 3000°C are passed through the MHD duct across which a strong magnetic field is applied.Since the gases are hot and partly ionised,they form an electrically conducting medium(conductor) moving in a magnetic field.Thus a voltage is generated.The electrical power generated by an MHD generator is in the direct current(dc)form.The principle of operation of a dc MHD generator is the same as that of a conventional dc generator.The essential difference between the two is as follows:
1.In an MHD generator an Ionised gas,or plasma,serves the purpose of conductor.In a dc generator a prime mover is needed but in an MHD generator,the flow of ionised gas replaces the prime mover.
2.In a conventional dc generator the current is carried to the external load through brushes.while in the MHD generator the same function is performed by electrodes.
3.The MHD generator performs the function of turbine and generator both.
4.The MHD generator is well suited for high power and high temperature.
1.In an MHD generator an Ionised gas,or plasma,serves the purpose of conductor.In a dc generator a prime mover is needed but in an MHD generator,the flow of ionised gas replaces the prime mover.
2.In a conventional dc generator the current is carried to the external load through brushes.while in the MHD generator the same function is performed by electrodes.
3.The MHD generator performs the function of turbine and generator both.
4.The MHD generator is well suited for high power and high temperature.
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