A composite guide tube for exhaust of pulse detonation wind source engine

Abstract

The present invention is a composite guide pipe for the exhaust of a pulse detonation wind source engine, comprising an inner pipe, an outer pipe, a spiral guide groove, a vortex air inlet, a guide pipe inlet, a guide pipe outlet, and a Laval pipe. The inner pipe and the outer pipe are welded together, and a spiral guide groove is welded on the outer wall of the inner pipe with stainless steel strips. A vortex air inlet is installed on the outer pipe, and the guide pipe inlet is connected to the outlet of the detonation chamber, and the guide pipe outlet is connected to the Laval pipe; the combustion gas generated by the detonation chamber is discharged through the inner pipe, and the air entering from the vortex air inlet flows outward along the spiral guide groove, which can cool the inner pipe wall; at the same time, the air can eliminate the turbulence of the combustion gas and extinguish the flame, and the air flow velocity of the formed hot air jet can be accelerated to supersonic speed after passing through the Laval pipe. The beneficial effect of the present invention is that the use of the composite guide pipe can effectively reduce the fluid temperature at the outlet of the engine, and at the same time can achieve continuous output of wind energy, reduce the noise during engine operation, and increase the exhaust speed.

Description

Technical Field

[0001] The invention relates to the field of pulse detonation engines, in particular to a composite flow guide tube for outputting combustion gas from a pulse detonation wind source engine. Background Art

[0002] The exhaust pipes of existing pulse detonation engines are all single-wall pipes, which have a very high temperature rise during exhaust and do not have the function of flame extinguishing. The fuel gas is directly discharged into the air after passing through the exhaust pipe. Summary of the invention

[0003] The invention provides a composite flow guide pipe for exhaust of a pulse detonation wind source engine.

[0004] The technical solution adopted by the present invention is: two stainless steel pipes of different thicknesses are divided into an inner pipe and an outer pipe and welded together; a spiral guide groove is welded on the outer wall of the inner pipe with stainless steel strips; a vortex air inlet is arranged on the outer pipe; the composite guide pipe inlet is connected to the outlet of the detonation chamber, and the outlet is connected to a Laval tube; the high-temperature gas generated by the detonation chamber is discharged through the inner pipe, and the air entering from the vortex air inlet flows along the spiral guide groove along the pipe wall, which can cool the pipe wall of the inner pipe and eliminate the influence of high temperature on the service life of the pipe wall material; at the same time, the incoming vortex air can eliminate turbulence of the gas output from the inner pipe and accelerate the output gas speed; the air and the gas output from the inner pipe can meet to extinguish the flame and make the gas become a hot air jet; after the hot air jet passes through the Laval tube, the air flow speed can be from subsonic to sonic, and even accelerated to supersonic, which can be used as a high-speed wind energy of a wind tunnel test device.

[0005] The beneficial effect of the present invention is that the use of the composite guide tube can effectively reduce the fluid temperature at the engine outlet, while achieving continuous output of wind energy, reducing the noise during engine operation and increasing the outlet wind speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a three-dimensional half-section diagram of an embodiment of the present invention.

[0007] In the figure: 1. Inner tube; 2. Outer tube; 3. Spiral guide groove; 4. Vortex air inlet; 5. Guide tube inlet; 6. Guide tube outlet; 7. Laval tube. DETAILED DESCRIPTION

[0008] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following specific examples are only explanations of the present invention and are not intended to limit the present invention.

[0009] like Figure 1As shown, an embodiment of the present invention provides a composite guide pipe for exhaust of a pulse detonation wind source engine, comprising an inner pipe 1, an outer pipe 2, a spiral guide groove 3, a vortex air inlet 4, a guide pipe inlet 5, a guide pipe outlet 6, and a Laval tube 7; the composite guide pipe is welded by the inner pipe 1 and the outer pipe 2; the spiral guide groove 3 is welded on the outer wall of the inner pipe 1; a vortex air inlet 4 is installed on the outer pipe 2; the composite guide pipe inlet 5 is connected to the detonation chamber outlet, and the guide pipe outlet 6 is connected to a Laval tube 7.

[0010] The composite guide tube for exhaust of the pulse detonation wind source engine is characterized in that the high-temperature gas generated in the detonation chamber is discharged through the inner tube 1, and the air coming in from the vortex air inlet 4 flows outward along the spiral guide groove 3, which can cool the inner tube wall and eliminate the influence of high temperature on the life of the tube wall material.

[0011] The composite guide tube for exhaust of the pulse detonation wind source engine is characterized in that the air flowing along the spiral guide groove 3 can eliminate turbulence of the combustion gas output from the inner tube 1 and accelerate the output gas speed.

[0012] The composite guide tube for the exhaust of the pulse detonation wind source engine is characterized in that the air coming in from the vortex air inlet 4 meets the combustion gas output from the inner tube 1 to extinguish the flame, so that the combustion gas becomes a hot air jet; after the hot air jet passes through the Laval tube 7, the air flow velocity can be increased from subsonic to sonic, and finally accelerated to supersonic.

Claims

1. A composite guide pipe for exhaust of a pulse detonation wind source engine, comprising an inner pipe, an outer pipe, a spiral guide groove, a vortex air inlet, a guide pipe inlet, a guide pipe outlet, and a Laval pipe; the composite guide pipe is welded by an inner pipe and an outer pipe; a spiral guide groove is welded on the outer wall of the inner pipe; a vortex air inlet is installed on the outer pipe; the composite guide pipe inlet is connected to the engine detonation chamber outlet, and the guide pipe outlet is connected to a Laval pipe.

2. The composite flow guide tube for exhaust of a pulse detonation wind source engine according to claim 1 is characterized in that: The high-temperature gas generated in the detonation chamber is discharged through the inner tube, and the air coming in from the vortex air inlet flows outward along the tube wall and the spiral guide groove, which can cool the inner tube wall and eliminate the influence of high temperature on the life of the tube wall material.

3. The composite flow guide tube for exhaust of a pulse detonation wind source engine according to claim 1 is characterized in that: The air flowing along the spiral guide groove can eliminate turbulence of the gas output from the inner tube and increase the output gas speed.

4. The composite flow guide tube for exhaust of a pulse detonation wind source engine according to claim 1 is characterized in that: The air coming in from the vortex air inlet meets the combustion gas output from the inner tube to extinguish the flame, turning the combustion gas into a hot air jet; after the hot air jet passes through the Laval tube, the air flow velocity can be from subsonic to sonic, and even to supersonic.

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