An electric generator based on a thermo-acoustic motor is not a myth!

Alternative energy sources today are the most fashionable trend in science. Advanced technologies vying with one another compete in obtaining cheap electricity from the energy of air, sun, and water. And absolutely all of them are fighting for maximum efficiency. After all, if the cost of production exceeds the amount of energy received, then what's the point in it - except for the fun to make some interesting physical experiments. physics - thermodynamics. She received a new period of rebirth with the invention of the Stirling heat engine. It happened back in the 19th century, and almost immediately led literally to a revolution in the technical field. Heat energy has become widely used in various engines.But the invention we are analyzing today belongs specifically to thermoacoustics - the science of the interaction of sound and heat. You ask, where does the engine and the generator? Let's deal in order.
Electric Generator Based on Thermoacoustic Engine

The Principle of Operation of a Thermoacoustic Engine

This improvised device is assembled literally from improvised materials, or even their remains. However, this does not prevent him from being called an engine-based generator, extracting electricity from heat. The basis of this phenomenon is the principle of creating acoustic waves transmitted through a resonator with two membranes, creating a resonance. On the top of them is a magnet, vibrating from these waves with a certain frequency. This leads to the formation of a magnetic field captured by the inductor. It, in turn, is capable of producing electrical current transmitted to the consumer. The basis of this invention is the upper module - a thermo-acoustic converter or a motor. In fact, it is a glass tube that is divided into three zones:
  • Heating zone - air or gas is heated in it
  • Regenerator zone -which alternately contacts with cold and hot air;
  • Cooling zone - in which the air temperature drops.
Electric generator based on thermoacoustic engine

Materials and tools

To create a motor-generator we need the following ingredients:
  • Glass
  • A piece of a metal pipe;
  • A few plumbing PVC corners;
  • A piece of a cardboard tube
  • Rubber ball or glove for membranes;
  • Electrical tape;
  • A roll of metal wool or washcloths;
  • Neodymium magnet;
  • Inductor;
  • A small piece of napkin for washing courts;
  • Wooden lining for an external outlet or switch;
  • Sealant, glue.
From the tools you can advise to have what must always be at hand for a real amateur tinker: knife, pliers, nippers, screwdriver, glue and silicone gun.

Collect thermo-acoustic generator

The design of the engine is assembled on the basis of frame copper tubes and one glass. Combines their resonator - an important and unusual part of this engine.In it, the movement of sound waves generated by the regenerator occurs. This is a simple cardboard tube, in the middle of which there is a membrane that does not allow air to circulate. If we exclude this element, then there will simply be no oscillations in the upper membrane, which is in the cavity of the resonator. The author of the video has preferred to cut the tube halfway, and to stretch a piece of rubber medical glove into one of the parts as the lower membrane. The seam of the connected fragments of the resonator was wrapped around with an insulating tape. The cavity of the resonator, he expanded specifically to enhance the effect of sound waves from the regenerator on the upper membrane. She made it from a denser rubber balloon. On the bottom of the tube is installed a wooden substrate for external switches or a socket for the stability of the installation. Electric generator based on a thermo-acoustic motor
A glass tube-motor is a tube, in the middle of which is placed a piece of metal wool or shavings. After the regeneration zone, air cooling should occur, which is facilitated by a piece of tissue soaked in water and wrapped around the base of the tube.Due to the movement of air through two opposing temperature media, intense generation of sound waves occurs. Electric generator based on thermoacoustic engineElectric generator based on thermoacoustic engineElectric generator based on thermo-acoustic motor The final part of the engine is a small but powerful neodymium magnet. It then creates small, but very frequent fluctuations, transmitted from the membrane under the influence of sound. Electric generator based on thermoacoustic engineElectric Generator Based on Thermoacoustic Engine To turn this thermoacoustic engine into a generator we need an inductor or a simple solenoid. This element can be made with your own hands by winding copper wire on a reel, for example, from fishing gear. The main condition is that its internal diameter must be larger than the diameter of the magnet. Electric generator based on thermoacoustic engine You can use an ordinary candle or a piece of dry alcohol as a transmitter of thermal energy for installing small sizes, and at the same time compare the received power from different heat sources.
Electric generator based on thermo-acoustic engine
Electric generator based on a thermoacoustic engine
In the experiment being conducted, the author demonstrates the effect of the inductor's approach to the magnet and its distance. Since there is no storage capacity in this electrical circuit, the difference is noticeable instantly.
Electric generator based on thermo-acoustic engine
Electric generator based on a thermo-acoustic motor
By fixing the coil in the area of ​​the magnetic field, you can receive electricity from such a generator for powering, for example, an LED panel or flashlights.
Electric generator based on thermo-acoustic engine
Electric generator based on thermoacoustic engine


Of course, such an invention today cannot be considered completely complete and complete. It requires improvement, since the author himself admits that the vibration from the sound waves is quite noticeable. The engine case is lightweight and contains no stabilizer, and the design itself is hlipkovata. However, the very fact of receiving electricity from heat can not be denied. Perhaps your modernization of this installation will lead to a grand breakthrough in the field of alternative energy, and the world will finally receive a source of cheap clean energy without harm to our planet.

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