JPH0694925B2 - Pulse combustion chamber and pulse combustion method - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention has a dual purpose mixing and ignition chamber in communication with a combustion chamber having a combustion chamber bifurcation and a plurality of exhaust tubes extending from the combustion chamber to an exhaust manifold. And a horizontal pulse combustion method having a fuel inlet valve, an air inlet valve, a combustion chamber, each having a plurality of downstream combustion chamber branches with a plurality of downstream exhaust tubes.

(Prior Art) Pulse combustion devices and methods are generally known to those skilled in the art. U.S. Pat. No. 4,314,444 to Putnam et al. Discloses a two stage stroke device that combusts a fuel and a combustion sustaining gas. First part of the fuel has a pulse combustion chamber
Burn in the process. The remaining fuel burns in the second combustion stroke with the gas drawn in using backflow through the aerodynamic valve inlet. No. 4,314,444 discloses a valveless pulsed combustion chamber in which the gas flow in one direction is stronger than the gas flow in opposite directions. In the 4,314,444 patent, a plurality of pulse combustion chambers is shown, each pulse combustion chamber having only one combustion chamber and only one outlet conduit. The second combustion stroke has one combustion chamber with multiple exhaust tubes. The 4,314,444 patent shows a vertical array of heating devices.

Kitchen U.S. Pat. No. 4,241,723 discloses a pulse combustion heater having a combustion chamber and at least one exhaust pipe forming a resonator having the chamber. The combustion chamber is in the form of a solid bronze casting having a generally flattened, spherical internal recess.

Whitacre U.S. Pat. No. 3,554,182 discloses a liquid heater particularly suitable for use in a liquid, such as for heating a swimming pool. The combustion produced is pulsed, in which the combustion chamber, in which the mixture of fuel and air is ignited, radiates heat to the surrounding heat-conducting wall of the chamber in contact with the liquid to be heated. , Has a body of high energy radiating material such as ceramic.

US Pat. No. 826,137 to Severyanin discloses a pulse combustion unit having an ignition chamber in communication with an exhaust chamber through two resonance tubes. One of the resonance tubes is three times longer than the other resonance tube in order to increase the combustion efficiency. The combustion products reach the exhaust chamber in antiphase, thus reducing sound emission.

Davis U.S. Pat. No. 4,637,792 describes a combustion chamber,
A pulsed combustion device having a floating valve member reciprocally mounted in the wall of the combustion chamber, the reciprocating motion of the floating valve opening and closing communication through a port between the supply of combustible mixture and the combustion chamber. Disclosure. This 4,637,792 patent discloses a single elongated combustion chamber burner shell that forms a combustion chamber. Davis U.S. Pat. No. 4,651,712 discloses a pulse combustion device having a combustion chamber with an inlet for a combustible mixture and a valveless outlet open to a gas of combustible gas. This 4,651,712 patent describes an elongated combustion chamber shell or burner shell forming a combustion chamber. The combustible mixture is ignited and burns in a single combustion chamber.

Adams U.S. Pat. No. 4,465,024 and Adams U.S. Pat.
No. 4,545,329 discloses a water heater having a water tank with a water inlet, a water outlet, and an opening in a side wall of the water tank. The combustion chamber assembly has a submerged portion adapted to fit within an opening in the side wall of the aquarium. The portion of the combustion chamber that is submerged in the liquid comprises a member that is elongated in the shape of a cylinder having an open end and an opposed closed end. A plurality of meandering flame tubes are connected to the closed end of the combustion chamber and extend toward one flame tube. The Adams patent discloses a power combustor in which fuel and air are the forces delivered to the point where combustion occurs.

Cook, U.S. Pat. No. 4,257,355, shows a cold water inlet tube placed in a horizontal position near the bottom of a commercial water heater. A water heater has a water tank made of a cylindrical shell surrounded by a lower head and an upper head. A plurality of longitudinal flame tubes are arranged inside the water tank and extend from the end of the combustion chamber into one flame tube. This device is operated by the natural suction and injection mechanism, not by the pulse combustion device.

Asakawa, U.S. Pat. No. 3,665,153, discloses an apparatus and method for heating water to generate steam or to supply hot water. A burner is positioned within the combustion chamber having a heat exchange tube passing from one end of the combustion chamber to the smoke holes. The combustor operates with a naturally aspirated squirt mechanism, not with an acoustically controlled pulse combustion mechanism.

Lovekin U.S. Pat. No. 1,170,834 discloses a temperature regulating valve mechanism for supplying gas to the burner of a heater.
FIG. 1 of this No. 1,179,834 shows one combustion chamber made in a corrugated shape with a flame tube emerging from one end.

The present invention is directed to a horizontal pulse combustion chamber having a fuel inlet valve, an air inlet valve, a mixing chamber in communication with a combustion chamber, and a plurality of downstream combustion chamber branches each in communication with a plurality of downstream exhaust tubes. In order to provide a method of pulse combustion in.

It is another object of the invention to provide a method of pulse combustion in which the combustion products gas flows through a downwardly sloping exhaust tube, thereby preventing the formation of condensate.

Another object of the present invention is to provide a method of pulse combustion in a pulse combustion chamber having an air inlet opening / closing lid valve and a fuel inlet opening / closing lid valve.

Yet another object of the present invention is to provide a pulse combustion chamber having a combustion chamber that properly draws gas and does not generate excessive noise.

Another object of the present invention is to provide a pulse combustion chamber that is easy to manufacture in a factory and does not require special mechanical equipment, molds, molds or the like.

Still further, the present invention provides a pulsed combustion chamber having one recessed combustion chamber that is first divided into a plurality of combustion chamber branches and then into a plurality of exhaust tubes to provide a larger surface area to increase heat transfer. Another purpose is to provide.

Another object of the present invention is to provide a pulse combustion chamber having one mixing and ignition chamber.

It is another object of the present invention to provide a pulsed combustion chamber having one combustion chamber divided into a plurality of combustion chamber branches each having a cross-sectional area smaller than the cross-sectional area of one combustion chamber.

(Summary of the Invention) In order to achieve the above object, according to the present invention, a method of pulse combustion generated in a pulse combustion chamber is performed in a horizontal position with respect to the ground, and an air inlet opening / closing lid valve and a fuel inlet opening / closing lid valve are provided. And a mixing chamber in communication with the combustion chamber, and a plurality of downstream combustion chamber branches each in communication with a plurality of downstream exhaust tubes.
This method has a step of sending air into the mixing chamber through the air inlet opening / closing lid valve and also sending fuel into the mixing chamber through the fuel inlet opening / closing lid valve. The fuel and air form a combustible fuel / air mixture in the combustion chamber. The fuel delivered into the mixing chamber is preferably gaseous. The fuel / air mixture is ignited to produce combustion within the combustion chamber.
Combustion evolved gas is then exhausted through a plurality of combustion chamber branches, each further exhausted through a plurality of exhaust tubes having a tube cross-sectional area that is smaller than the branch cross-sectional area of the corresponding combustion chamber branch. The combustion producing tube may be further exhausted from the exhaust tube into the exhaust manifold.

In one embodiment of the present invention, the mixing / ignition chamber is positioned downstream of the air inlet opening / closing lid valve and the fuel inlet opening / closing lid valve and upstream of the combustion chamber. That is, it does not travel backflow through either the air or fuel lines, and the backflow does not contain a combustible mixture.

In one embodiment of the present invention, combustion products gas flows through an exhaust tube that is inclined downward. Such a shape allows fluid to flow through the exhaust tube without the formation of condensation.

In one embodiment of the present invention, the pulse combustion chamber has an outer surface surrounded by a fluid, preferably water.
The heat generated by combustion transfers to the fluid through the outer surface of the pulse combustion chamber. In one embodiment, a corrugation is formed on at least a portion of the outer surface of the pulse combustion chamber, which results in heat transfer as compared to the thermal transition of a similar pulse combustion chamber without corrugated walls. Metastases are increased. By having at least one fin attached to the outer surface of the pulse combustion chamber, the heat transfer from the outer surface to the surrounding fluid can also be significantly increased.

In one embodiment, the total cross-sectional area of each exhaust tube is less than the total cross-sectional area of each combustion chamber branch. In another embodiment, the total cross-sectional area of each combustion chamber branch is less than the cross-sectional area of the combustion chamber.

In another embodiment of the invention, the pulse combustion chamber system includes a dual purpose mixing and ignition chamber in communication with the fuel inlet tube and the air inlet tube. A fuel inlet tube and an air inlet tube respectively deliver fuel and air to form a combustible fuel / air mixture in the dual purpose mixing and ignition chamber. A mixing / ignition chamber, which also serves as an ignition source, is located inside the mixing / ignition chamber, which ignites the fuel / air mixture.

The pulse combustion chamber further has a combustion chamber in communication with the mixing and ignition chamber. The combustion mechanism has a single combustion chamber that is first divided into a plurality of downstream combustion chamber branches, and then each of these downstream combustion chamber branches is further divided into at least one, and preferably a plurality of exhaust tubes. The combustion chamber branches of the combustion chamber have elongated holes between the combustion chamber branches. At least one stiffening post is attached to the wall of the combustion chamber branch within the elongated holes between the combustion chamber branches.

At least one exhaust tube is hermetically attached to the wall of the combustion chamber and has a chamber end in communication with the chamber. Each exhaust tube has an exhaust manifold end that is hermetically attached to and communicates with the exhaust manifold.

A fuel inlet tube is hermetically attached to the wall of the mixing and ignition chamber and is in communication with the mixing and ignition chamber. Similarly, an air inlet tube is hermetically attached to and in communication with the wall of the mixing and ignition chamber. The cross sectional area of each combustion chamber branch is smaller than the cross sectional area of the main combustion chamber. The cross-sectional area of each exhaust tube is smaller than the cross-sectional area of the combustion chamber branch with which the exhaust tube communicates.

According to one embodiment of the present invention, the main combustion chamber and its combustion chamber branches have corrugated sides to increase heat transfer. According to another embodiment of the present invention, the main combustion chamber and its combustion chamber branch have at least one fin attached to at least one side of the combustion chamber including the combustion chamber branch and extending therethrough, This increases the heat transfer.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

Pulsed combustion is an acoustically controlled oscillatory combustion in which a sinusoidal pressure wave is generated in the combustion chamber. After the first ignition, combustion continues without further ignition from an ignition source such as a spark plug. The vibration frequency inside the combustion chamber is primarily a function of the combustion chamber volume, the total cross-sectional area of the exhaust tube, the length of the exhaust tube, and the speed of sound.

One major advantage of the present invention is that the heat transfer is significantly increased compared to the heat transfer performed in conventional combustion chambers. In the combustion chamber according to the invention, the majority of the heat is transferred through the walls of the combustion chamber, i.e. the larger heat transfer is achieved by the shape with the increased surface area without increasing the external volume of the combustion chamber. be able to.

According to the embodiment of the present invention, the pulse combustion process occurs inside the pulse combustion chamber 10 shown in FIGS. 1, 2 and 3. It is desirable for the combustion process to occur within the embodiment of pulse combustion chamber 10 having fuel inlet valve means, air inlet valve means, combustion chamber 15 and a plurality of downstream combustion chamber branches 16. Each combustion chamber branch 16 communicates with a plurality of downstream exhaust tubes 20.

Air mixing and ignition chamber through air inlet valve means
The pulse combustion method starts by sending it into 13. In the preferred embodiment, the air inlet valve means comprises at least one air inlet open / close lid valve 17 positioned upstream of and in communication with the mixing / ignition chamber 13 as shown in FIG.

As shown in FIG. 1, fuel is fed into the mixing and ignition chamber 13 through the fuel inlet valve means. In an embodiment of the present invention, the fuel inlet valve means comprises a mixing and ignition chamber 13
Has at least one fuel inlet opening / closing lid valve 18 positioned upstream of and in communication with the mixing and ignition chamber. In one embodiment of the invention, the fuel is a gaseous fuel suitable for burning within the combustion zone.

It goes without saying that the air inlet valve means and the fuel inlet valve means may have other known valves suitable for pulse combustion. In particular, an open / close lid restraint valve suitable for either air or fuel is described in the US patent application with number 229,129 issued Aug. 5, 1988, which is incorporated herein by reference. Is doing.

The fuel and air delivered into the mixing chamber combine to form a combustible fuel / air mixture within the mixing zone. This fuel / air mixture is then ignited to produce combustion in combustion chamber 15. The combustion products gas is then exhausted through the combustion chamber branch 16 and further through the exhaust tube 20.

In one embodiment of the invention, the mixing zone comprises the volume of the mixing and ignition chamber 13 positioned upstream from the combustion chamber 15. Of course, combustion occurs in the mixing / ignition chamber 13 and continues in the combustion chamber 15.

It is desirable that the combustion products gas be exhausted through an exhaust tube 20 that slopes downward. As shown in FIGS. 2 and 3, such downward inclination of each exhaust tube 20 prevents the formation of a condensate inside each exhaust tube 20. In another embodiment of the present invention, the combustion process has an exhaust manifold 21 positioned downstream from the exhaust tube 20.
The method further includes the step of exhausting the combustion product gas into the interior.

In the embodiment according to the invention, the pulse combustion chamber 10 with the exhaust tube 20 and the exhaust manifold 20 are submerged in a fluid, preferably water, to a water level 29 as shown in FIG. The pulse combustion chamber 10 has a combustion chamber 15 and / or a combustion chamber branch 16 provided with a corrugation 30 on at least a part of its outer surface as shown in FIG. The transfer of heat to the fluid can be increased. Combustion chamber 15 and combustion chamber branch 16
Heat transfer can also be increased by having at least one fin attached to both or one of the outer surfaces.

To provide a suitable fluid flow condition throughout the pulse combustion chamber 10, one embodiment of the present invention includes exhaust tubes 20 each having a cross-sectional area smaller than the cross-sectional area of each combustion chamber branch 16. ing. In another embodiment, the total cross-sectional area of each exhaust tube 20 within each combustion chamber branch 16 is less than the cross-sectional area of each combustion chamber branch 16. In yet another embodiment, the total cross-sectional area of each combustion chamber branch 16 is smaller than the cross-sectional area of the combustion chamber 15.

As shown in FIGS. 1, 2 and 3, in an embodiment of the invention, the pulse combustion chamber 10 is hermetically sealed to the mixing / ignition chamber wall 33 as formed by the mixing / ignition chamber wall 33. It has a fuel inlet tube 11 and an air inlet tube 12 mounted and in communication with the mixing and ignition chamber 13. The fuel inlet tube 11 and the air inlet tube 12 are hermetically attached to the mixing and ignition chamber wall 33, such as by welding and screwing and having a fuel inlet tube 11 and an air inlet tube 12 as passages inside the block instead of tubes. Of course you can. Fuel inlet tube 11 delivers fuel and air inlet tube 12 delivers compressed air into mixing and ignition chamber 13, thereby forming a combustible fuel / air mixture within mixing and ignition chamber 13.

An ignition source is positioned within the mixing and ignition chamber 13 to ignite the fuel / air mixture within the mixing and ignition chamber 13. Of course, the igniter may be a spark plug, a glow plug, or any other ignition source known to those skilled in the art. Once combustion occurs from the primary ignition source, the pulse combustion chamber 10 operates to continue combustion without the need for further ignition from the primary ignition source such as a spark plug or glow plug.

Main combustion chamber 15 formed by combustion chamber wall 35
Communicate with the mixing and ignition chamber 13. In an embodiment of the invention, the main combustion chamber 15 has a transition plate 14 hermetically attached to one end of the main combustion chamber wall 35. The transition plate 14 has a passage hole communicating with the mixing / ignition chamber 13. The mixing / ignition chamber wall 33 is attached to either the transition plate 14 or the combustion chamber wall 35 by welding and screwing, or the mixing / ignition chamber 33 and the main combustion chamber wall 35 are integrally attached by molding or the like. Of course, it is possible.

As shown in FIG. 1, the main combustion chamber 15 is divided into a plurality of downstream combustion chamber branches 16 formed by a combustion chamber branch wall 36. A plurality of exhaust tubes 20 are attached to both or one of the main combustion chamber wall 35 and the combustion chamber branch wall 36 along the longitudinal axis of the main combustion chamber 15. 1 and 3 show that the main combustion chamber 15 has two combustion chamber branches 16 and several exhaust tubes 20. 4 and 5
FIG. 6 and FIG. 6 show that the main combustion chamber 15 has four combustion chamber branches 16. Main combustion chamber 15 has two or more downstream combustion chamber branches
Of course, it may be divided into 16. Such a branched structure increases heat transfer by increasing the surface area and making more contact between the combustion gas and the inner surface of the heat exchanger.

Combustion chamber bifurcation 16 has a "U" shaped elongated hole 23 positioned between combustion chamber bifurcations 16 of main combustion chamber 15. In an embodiment of the invention, at least one stiffening strut 25 extends over the elongated hole 23 and is mounted between the combustion chamber bifurcation walls 36. Reinforcing prop 25
Thus, the combustion chamber branch wall 36 is firmly supported.

In an embodiment of the invention, the combustion chamber branch 16 of the main combustion chamber 15 has an end plate 24 hermetically attached to the combustion chamber branch wall 36. Combustion chamber branch 16 can be sealed, such as by having combustion chamber branch wall 36 welded together, molded together, and connected to another chamber or tube.

Depending on the specific design of the pulse combustion chamber 10, the main combustion chamber
15 Complete combustion inside or main combustion chamber
The combustion can continue in 15 and then be brought into the combustion chamber branch 16 to complete the combustion. Whether combustion completion occurs within the main combustion chamber 15 or is brought into the combustion chamber branch 16 depends on the overall volume and shape of the main combustion chamber 15 and the combustion chamber branch 16. The position of completion of combustion is determined by the flame velocity, response time, and the number, spacing, and size of exhaust tubes. In the embodiment of the present invention, the combustion is completed inside the main combustion chamber 15 and is not brought into the combustion chamber branch portion 16.

As shown in FIGS. 1, 2 and 3, each exhaust tube 20 has a chamber end that is hermetically attached to and in communication with the main combustion chamber wall 35 and / or the combustion chamber branch wall 36. ing. Each exhaust tube 20 is second
As shown, an exhaust manifold 21 is further provided.
In an embodiment of the invention, along the longitudinal axis of the main combustion chamber 15 and along the longitudinal axis of the combustion chamber branch 16,
A plurality of exhaust tubes 20 are hermetically attached to the main combustion chamber wall 35 and the combustion chamber branch wall 36. Such a longitudinal arrangement increases the heat transfer by providing a larger surface area for heat exchange. The exhaust tube 20 can be hermetically attached to the main combustion chamber wall 35 and / or the combustion chamber branch wall 36 and the exhaust manifold 21 using welding, screwing, passage means or the like.

In the embodiment of the present invention, as shown in FIGS. 2 and 3, the exhaust tube 20 is inclined downward and has a staggered shape.
Has. Of course, the exhaust tube 20 may have another bent shape. However, due to the staggered exhaust tubes 20, multiple exhaust tubes 20
Can be provided in a convenient shape for mounting to the main combustion chamber wall 35 and / or the combustion chamber bifurcation wall 36, or one. Since the exhaust tube 20 is inclined downward,
It is possible to prevent water or condensed matter from the flame tube gas from accumulating in the exhaust tube 20. Due to the downwardly sloping shape, any condensate can be drained into the exhaust manifold 21, from which such condensate can be easily removed. Even during the initial operation of the relatively cold pulse combustion chamber 10 or
Acts as a condensing unit and accumulates condensate when it reaches very high temperatures.

Each combustion chamber branch 16 has a cross-sectional area that is smaller than the cross-sectional area of the main combustion chamber 15. Each exhaust tube 20
But the combustion chamber branch where the exhaust tube 20 communicates
It has a smaller cross-sectional area than 16 cross-sectional areas. The exhaust tube 20 is attached to both or one of the main combustion chamber wall 35 and the combustion chamber branch wall 36 at a position where combustion is almost completed. In this case, the combustion chamber branch wall 36 exhaust tube 20 is replaced by the combustion chamber branch wall 36.
Attached to the combustion chamber branch 16 to transfer heat to the combustion chamber branch wall 36 by the flow of the combustion gas stream, the exhaust tubes 20 of which are connected to the main combustion chamber wall.
Attached to 35, it is basically preferable to the gas flow through the path of least resistance. In the embodiment of the present invention,
The main combustion chamber wall 35 and the combustion chamber branch wall 36 are corrugated to provide a larger surface area, thereby increasing heat transfer. In FIG. 6, a main combustion chamber wall 35 and a combustion chamber branch wall 36 having a wavy shape are shown. Main combustion chamber wall 35
And, of course, one or both of the combustion chamber branch walls 36 may have other heat transfer means such as wall mounted fins to increase heat transfer.

4, 5, and 6 show a main combustion chamber 15 having four combustion chamber branches 16. As shown in FIG. 4, the plurality of exhaust tubes 20 are connected to the combustion chamber.
It has a curved shape that extends between the exhaust manifold 21 and the exhaust manifold 21 and is inclined downward. As shown in FIGS. 2 and 3, the pulse combustion chamber 10 including the exhaust tube 20 has a shell 28.
Of course, it can be adapted to the inside of the above. FIG. 2 shows the pulse combustion chamber 10 operating as a steam boiler in which the pulse combustion chamber 10, the exhaust tube 20 and the exhaust manifold 22 are submerged in the shell 28. Liquid level 29 indicates the water level inside shell 28, or other liquid level.

There are several design considerations for the pulsed combustion chamber according to the present invention. The main combustion chamber 15 must have an appropriate size as the area for the previously described fuel / air mixture. If the main combustion chamber 15 is too large, it may lack adequate suction. If the main combustion chamber 15 is too small, excessive noise can occur, which is difficult and costly to dampen. The main combustion chamber 15 must have a surface area sufficient for proper heat transfer, and / or the main combustion chamber wall 35 and / or the combustion chamber branch wall 36 are easy to mount the exhaust tube 20. And have a sufficient surface area. As the cross-sectional area of the combustion chamber bifurcation 16 decreases, the velocity of hot combustion products increases, increasing heat transfer. Reinforcing prop 25
Firmly supports the combustion chamber branch portion 16 and reduces the vibration of the metal plate surface of the combustion chamber branch portion wall 36.

With the combustion chamber having a given total volume of the combustion chamber and all associated combustion chamber bifurcations, the pulse combustion chamber 10 of the present invention has a generally greater heat transfer and has the same volume. Greater heat transfer per surface area than conventional single combustion chamber pulsed combustion chambers.

In the above specifications, the present invention relates to specific embodiments,
It will be appreciated that the details have been described for purposes of illustration and the invention permits additional embodiments and modifications may be made without departing from the basic spirit of the invention.

[Brief description of drawings]

FIG. 1 is a plan view of a pulse combustion chamber having a plurality of combustion chamber branches and a plurality of exhaust tubes and not showing an exhaust manifold of the pulse combustion chamber according to an embodiment of the present invention, FIG. Is 2 of the pulse combustion chamber of FIG. 1 submerged in the liquid.
-2 line sectional view, FIG. 3 is a 3-3 line sectional view of the pulse combustion chamber of FIG. 1, and FIG. 4 is four combustion chamber branches and two combustion chamber branch parts according to one embodiment of the present invention. FIG. 5 is an end view of a pulse combustion chamber having a main combustion chamber with pores, FIG. 5 shows a main combustion chamber with four combustion chamber branches and two pores according to one embodiment of the present invention. FIG. 6 is a perspective view of a pulse combustion chamber having, and FIG. 6 is a perspective view of a pulse combustion chamber having a main combustion chamber having a wavy side surface and four combustion chamber branches according to an embodiment of the present invention. It is a figure. 10: Pulse combustion chamber, 11: Fuel inlet tube, 12: Air inlet tube, 13: Mixing / ignition chamber, 14: Transition plate, 15: Main combustion chamber, 16: Combustion chamber branch part, 17: Air inlet opening / closing lid valve , 18: Fuel inlet opening / closing lid valve, 20: Exhaust tube, 21: Exhaust manifold, 23: Pore, 24: End plate, 25: Reinforcing column, 28: Shell, 29: Liquid level, 33: Mixing / ignition Chamber wall, 35: Main combustion chamber wall, 36: Combustion chamber branch wall.

Claims (16)

[Claims] 1. A fuel inlet valve means, an air inlet valve means, a combustion chamber, a plurality of downstream exhaust tubes,
A method of pulse combustion in a horizontal pulse combustion chamber having a plurality of downstream combustion chamber branches communicating with each other, wherein air is sent into a mixing / ignition chamber through the air inlet valve means, Fuel is fed into the mixing / ignition chamber via valve means to form a combustible fuel / air mixture in the mixing / ignition chamber and ignites the fuel / air mixture to burn inside the mixing / ignition chamber. Through a plurality of exhaust tubes each having a tube cross-sectional area smaller than the branch cross-sectional area of the corresponding combustion chamber branch. A pulse combustion method comprising exhausting combustion product gas and increasing heat transfer from the combustion product gas. 2. The pulse combustion method according to claim 1, wherein the combustion of the fuel-air mixture is continuous in the combustion chamber. 3. The air inlet valve means through which air passes further comprises at least one air inlet lid valve positioned upstream of and in communication with the mixing and ignition chamber. The pulse combustion method according to item 1. 4. The fuel inlet valve means through which fuel passes further comprises at least one fuel inlet opening and closing lid valve positioned upstream of the mixing and ignition chamber and in communication with the mixing and ignition chamber. The pulse combustion method according to claim 1. 5. The step of increasing heat transfer to a liquid surrounding the outer surface of the combustion chamber by having at least one fin attached to the outer surface of the combustion chamber. The pulse combustion method according to item 1. 6. The pulse of claim 1, wherein the sum of the tube cross-sectional areas of each exhaust tube within the corresponding combustion chamber branch is less than the corresponding cross-sectional area of the combustion chamber branch. Combustion method. 7. The pulse combustion method according to claim 1, wherein the sum of the cross-sectional areas of the respective branch portions of each of the combustion chamber branches is smaller than the chamber cross-sectional area of the combustion chamber. 8. A mixing chamber, an ignition chamber, a fuel inlet means and an air inlet means, said air inlet means and said fuel inlet means respectively delivering combustion air and fuel to produce a combustible fuel / air mixture. A pulse combustion chamber of the type to be formed comprises a combustion chamber having a plurality of downstream combustion chamber branches, the combustion chamber branch being provided between at least one combustion chamber branch wall of each combustion chamber branch. Pulsed combustion chamber having a plurality of elongated holes formed therein and a plurality of exhaust tubes having one end communicating with the combustion chamber branch portion. 9. The pulse combustion chamber according to claim 8, wherein the cross-sectional area of each combustion chamber branch is smaller than the cross-sectional area of the combustion chamber. 10. The pulse combustion chamber according to claim 8, wherein a cross-sectional area of each of the exhaust tubes is smaller than a cross-sectional area of each of the combustion chamber branches where the exhaust tubes communicate with each other. 11. The combustion chamber branch of the combustion chamber further comprises at least one stiffening strut mounted between walls of at least one of the combustion chamber branches of each combustion chamber branch. 8th
The pulse combustion chamber according to the item. 12. The combustion chamber branch of the combustion chamber further comprises at least one stiffening strut mounted between walls of the at least one combustion chamber branch proximate the combustion chamber branch. The pulse combustion chamber according to claim 8, characterized in that 13. The pulse combustion chamber according to claim 8, wherein at least one of the combustion chamber branch walls has a corrugated side surface. 14. The pulse combustion chamber of claim 8 having a plurality of fins mounted on at least one said combustion chamber wall and at least one said combustion chamber branch wall. 15. The pulse combustion method according to claim 1, wherein the exhaust tube through which the combustion product gas flows is inclined downward. 16. The pulse combustion chamber according to claim 8, wherein the exhaust tube has a shape inclined downward.