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Bypasses In The Loop Thermoacoustic Engine
I was motivated at creating for this engine that I wanted to remove the membrane from my active membrane engine.
But how to make a membrane out of gas? The most similar can be done by looping to create a traveling wave in the bypass.
Traditional thermoacoustic loop engine is simple, but it doesn't like the long regenerator. The regenerator strangles the gas pistons a lot because gas pistons have small weight and momentum. If the gas piston is too long, the resistance of the pipe is huge. Have you ever tried to blow through pipes of different lengths? You will be amazed at how hard it is! The regenerator is widened and made thinner how it not be strangled the gas pistons. This widening also creates a softer suspension space into which the gas piston can penetrate with greater momentum, and the bigger regenerator surface alsowill give the engine more power . A thin regenerator has a higher heat loss at high temperatures because heat passes through it, and in small size very cumbersome build because the heating or cooling fluid has to be introduced into the engine and expensive.
If we want a longer regenerator and shorter tubes, then instead of a gas piston (resonator) we can use a water piston, but it will be too slow, the power of the engine will be less, or we can use membranes with mass, but they must be durable and tuned, or solid pistons which must be very accurate but these make construction difficult also. These are not as simple as they seem.
In the bypass engine, the regenerator does not choke the piston because it does not be in its way, but at the bouncing goes a part of the gas to through the regenerator, where the gas can expand or contract. Therefore, a longer regenerator also works. The bypass engines are more efficient. The most efficient engine is the my active membrane engines. Others put in the engines a membrane because it stops the Gedeon streaming. Gedeon streaming makes worse the engine because it dissipates the heat from the regenerator so it cannot use it. The function of the membrane is for the wave to pass through it, but it stops the flow. I differently use the membrane, actively, it participates in the operation of the engine as a displacer. This not only stops the flow of Gedeon, but also makes the engine much stronger because the gas moves on both sides of the membrene. The disadvantage is that the resonance of the membrane has to be adjusted and generally people cannot understood, perhaps they cannot designed it with the Delta EC program either. Bypass engines is more complicated to design as loop engines.
The further motivation for the development of the Bypasses in the loop (BITL) engine is to combine the advantages of the loop (with more regnerators) and bypass engine. The goal is a motor with an easier plannable, simpler heat exchanger, pressurized turbine generator, without a membrane which is easy and inexpensive to build at home. The Gedeon streaming can be stoped without a diaphragm. Without the active membrane strengthening of the bypasses unit can be solved by with a phase shift.
https://www.youtube.com/watch?v=bszFlnbytL8
The single core experiment.
Additional knowledge can be gained through a single-core experiment. We can make a simpler loop engine with single core (regenerator) . Single-core loop machines have very high losses due to the long tube, so the efficiency is worse. An amplifier is required for such a engine. A tuning stub is used to suppress acoustic impedance disturbances.
https://www.sciencedirect.com/science/article/abs/pii/S0196890417306465
This is a closed short half tube, the operation of which I do not understand, I could only determine its length by adjustment, but I did not deal with it further later.
I found a simpler way to amplify The bypass and loop mixed motor (BALM) :
The length of the loop should be divided by fourThis number is equivalent the lenght of the rezonator tube. This configuration works I think is a kind of bypass and loop mixture motor. Here is an old video of this:
https://www.youtube.com/watch?v=t-Lj2RSIGTM
If this pipe is fitted after the thermal buffer tube, the machine can also operate openly. This tube can be closed in a similar way to a quarter-wave machine, with a tube of the same length but closed at the end, or with a tank.
The single-core experiment of a BITL machine can be implemented in the same way as for a simple loop.
In this experiment, only the very dense regenerator worked, but only barely because the loop was long enough, the loss was huge.
Theoretically, four resonators can be used for the four cores. Will it be stronger? They can also be connected crossed ...
A lot of idea...
More videos coming ...
