03-02-2017, 12:45 PM
Pulse pulse engines, or Pulse-jets are a very simple family of internal combustion engine that have few or no moving parts. They were invented in the early 1900s, and were avant-garde science until after World War II. Pulse-jets were abandoned, many feel long before it even reached its apogee. They went from being the main source of energy for tens of thousands of cruise missiles, to nothing more than something an amateur fan could build in his garage and used to power planes in Jet Speed contests. Pulse-jets have experienced a recent surge in popularity due to many unique properties, and their similarity with pulse detonation engines, making the test platform perfect for many supportive technologies and devices.
There are two basic types of pulse jet engines, motors with valves and motors without valves. Both types operate on the same principles, and can operate on a wide range of fuels, can scale to very small or very large sizes, and are surprisingly powerful for their simplicity.
The video above is an animation that shows a simplified flow visualization on a TP-180 Valveless Pulse jet. Blue represents cold air being drawn into the engine, through the intake and tail, forming the tail "cold air piston" Green represents the fuel mixture with air, and red represents combustion and gas Super heated. Notice how a super hot gas always stays on the engine, to turn on every new fuel load.
Questions and Myths of Pulse-jet
These seem to be the most common questions and misconceptions that run on the Internet.
Pulse jets can not function unless they are flying through the air at high speed.
This is false, the pulse jets can run in a dead center, or even travel back at a considerable speed.
The pulse jets are very hungry.
There are jet jets that are inefficient, just as there are cars that are inefficient. You will always hear of these instead of pulse jets that have comparable or better fuel efficiency than large sized turbine engines of similar size. Chances are the engine that someone designs on a napkin and builds in your garage is not going to be as efficient as other highly refined designs.
Pulse jets shine in orange and burn off both fuel energy and heat.
Heat is a by-product of all engines, it is what allows us to do the job. Without the energy of expanding the release of heat, there would be no work. The fact that a motor shines orange does not mean that it loses excessive energy. A mild steel motor will radiate approximately 8 times the power as a stainless steel motor. This is also the reason why things like thermos containers are made of stainless steel, of all metals is one of the most insulating.
The pulse jets have a limited maximum speed and can not be strangled, either on or off.
Well, firstly, what does not have a limited top speed? There are designs that can operate at or above the speed of sound, and there are others that start to lose power at over 200 mph. Pulse jets can be throttled in a wider range than most turbines or other engines. Some non-valve injectors can operate with less than 1% output! They can also run on almost any fuel, or even waste material.
Pulse jets are dangerous and are likely to explode.
Hot coffee, wet floor signs, AA batteries and permanent markers have hazard warnings ... does this mean that they are dangerous to responsible intelligent people who behave correctly regarding the conditions the items were intended to Be used We have never encountered a single credible, or not credible, case, counting a blasting pulse. The closest thing we found was an idiot who soldered his 100-pound push engine together with soldering points and then made a big fuss when the knit welds broke and the engine stopped working. Turbojet engines, on the other hand, can, and have exploded very violently many times.
There are two basic types of pulse jet engines, motors with valves and motors without valves. Both types operate on the same principles, and can operate on a wide range of fuels, can scale to very small or very large sizes, and are surprisingly powerful for their simplicity.
The video above is an animation that shows a simplified flow visualization on a TP-180 Valveless Pulse jet. Blue represents cold air being drawn into the engine, through the intake and tail, forming the tail "cold air piston" Green represents the fuel mixture with air, and red represents combustion and gas Super heated. Notice how a super hot gas always stays on the engine, to turn on every new fuel load.
Questions and Myths of Pulse-jet
These seem to be the most common questions and misconceptions that run on the Internet.
Pulse jets can not function unless they are flying through the air at high speed.
This is false, the pulse jets can run in a dead center, or even travel back at a considerable speed.
The pulse jets are very hungry.
There are jet jets that are inefficient, just as there are cars that are inefficient. You will always hear of these instead of pulse jets that have comparable or better fuel efficiency than large sized turbine engines of similar size. Chances are the engine that someone designs on a napkin and builds in your garage is not going to be as efficient as other highly refined designs.
Pulse jets shine in orange and burn off both fuel energy and heat.
Heat is a by-product of all engines, it is what allows us to do the job. Without the energy of expanding the release of heat, there would be no work. The fact that a motor shines orange does not mean that it loses excessive energy. A mild steel motor will radiate approximately 8 times the power as a stainless steel motor. This is also the reason why things like thermos containers are made of stainless steel, of all metals is one of the most insulating.
The pulse jets have a limited maximum speed and can not be strangled, either on or off.
Well, firstly, what does not have a limited top speed? There are designs that can operate at or above the speed of sound, and there are others that start to lose power at over 200 mph. Pulse jets can be throttled in a wider range than most turbines or other engines. Some non-valve injectors can operate with less than 1% output! They can also run on almost any fuel, or even waste material.
Pulse jets are dangerous and are likely to explode.
Hot coffee, wet floor signs, AA batteries and permanent markers have hazard warnings ... does this mean that they are dangerous to responsible intelligent people who behave correctly regarding the conditions the items were intended to Be used We have never encountered a single credible, or not credible, case, counting a blasting pulse. The closest thing we found was an idiot who soldered his 100-pound push engine together with soldering points and then made a big fuss when the knit welds broke and the engine stopped working. Turbojet engines, on the other hand, can, and have exploded very violently many times.