Exploring other ways to increase the efficiency of gas turbines

Using the kinetic energy of the generator's rotor

Tapping into the kinetic energy of the generator's spinning rotor might reduce the energy loss caused by the back work of the compressors and increase overall gas turbine efficiency! See picture below.

Diagram explaining back work ratio in gas turbinnes

The turbines that drive the compressors of a gas turbine consume about 60% of the energy of the hot gases leaving the combustors.

It might be more efficient to drive the compressors by connecting them to the generator's rotor. This way 100% of the energy of the hot gasses leaving the combustors, can be used to drive the generator's turbine. See flowchart below.

Flowchart hydrauliic gasturbine

How it works

A starter motor starts the gas turbine.

The generator's rotor drives (through a gear box) a hydraulic pump which drives a hydraulic motor, which drives (through a gear box) the compressor.

The compressor takes in air, compresses the air and sends the air to the combustors where it is heated.

Next, the hot air expands in the power turbine, driving the generator producing electricity. As soon as the gas turbine is working at full speed the starter engine is disconnected

The hot exhaust air leaving the power turbine can be used to make steam and drive a second power turbine (combined cycle).


Hydraulic pump and motor can be used to increase the kinetic energy of the rotor. To give you an idea of the potential kinetic energy look at the picture shown below. It shows that the rotor of a generator can be quite large and weigh > 1000 kilo. The rotor of most generators spin at 3000 to 3600 times per minute. 1000 kilo's or more spinning at 3600 rpm contains a lot of kinetic energy!
Large rotor of generator

The rpm of the compressor can be made independ from the turbine's rpm, by using a gear box. You can adjust compressor more efficiently to the humidity level and altitude

All kinds of compressors van be used e.g. axial, piston, centrifugal etc. High volume low pressure, or high pressure low volume models.

In stead of a turbine to drive the generator, you can also use a pneumatic or hydraulic motor (although heat might be a problem).

In the future it might be possible to use cold fusion / LENR type reactor.

Using induction heating the air inside combustors

Another way to heat air inside combustors of a gas turbine might be achieved fitting induction coils on the outside of the combustor. See pictures below.

Diagram of gas turbine combustor fitted with induction coils

Tekna 30 kw plasma torch
This implies the combustor is made of a material, e.g. ceramics or quartz, that can withstand high pressure and temperature and at same time let the electromagnetic waves propagate through the combustor's sides, so it can heat (by partial ionization) the compressed air inside the combustor to 1400 C.

More to follow soon