## Generation of electricity from fire

### Direct conversion

**Principle**

It has been suggested that the movement of ions in flames could
be used with a magnetic field to make electricity. I suggest, along
similar lines, a different geometry.

Consider a cylindrical mass of burning gas. Enclose this
with a cylindrical coil carrying a heavy electrical current. Inside this
place another coil of a conductor so that this is between the flame and the
magnet.

When the gas is hot there is a high content of ions that can
carry a current of electricity. As this gas expands some of the magnetic flux is
expelled from the gas and the change in magnetic flux in the inside coil will
generate an electric current.

**Simplify**

The coil that makes the magnetic field can also sense the change
caused by the expansion of the hot gas, thus only one coil is required.

**Make an Oscillator**

Put this coil into a tank circuit with a capacitor. Charge
the capacitor then connect to the coil, the current flow will compress the
flame, making it hotter. As a result it will oppose this compression and
then the current decays and the gas will expand. As the gas expands it will do
work on the magnetic field making a bigger charge accumulate on the capacitor
than initially.

The cycle will then repeat and the amplitude of the oscillations
will increase until losses prevent further increase.

**Extract Power**

Once this has happened the device may be used to deliver
electrical power to another system by connecting the system as a parallel load.

In this diagram, it may be seen that the surface area of the
plasma is much less than the surface area of the inside of the torus of windings
that contain it. Thus there will be a force toward the centre, which is
constant along the radius but the area of a torus at a particular radius will
decrease toward the circle of the centre. Thus as the plasma contracts the
pressure on it will increase. The area is 2(pi)rl, where l is the length of a
line drawn round the circle of the torus of the plasma at the point. So as
the radius of the plasma decreases the pressure increases as 1/r. Thus
near the centre the pressure will increase very rapidly without any stress on
the containing torus of windings. This makes the achievement of very high
pressure possible through moderate current in the windings.

**Comment**

If you look at the "Thermonuclear
Power" section it may be seen that this may be used to extract power
from the containment
mentioned there.

*Chris 17/2/2002.*