Permeable wall structure of variable-diameter pore channel

Abstract

The utility model discloses a permeation wall structure of a variable-diameter pore channel and belongs to the technical field of permeation spray pipes. The structure comprises an upper-layer pore channel, a middle-layer pore channel, a lower-layer pore channel and a circular sheet, the upper-layer pore channel is a circular pore channel; the middle-layer pore channel is a round pore channel, grooves are formed in the inner wall surface of the middle-layer pore channel in a manner of reversely extending along two ends of the diameter, and the diameter of the round pore channel of the middle-layer pore channel is larger than that of the round pore channel of the upper-layer pore channel; the lower-layer pore channel is an arc cross-shaped pore channel, and the arc part is consistent with the middle-layer pore channel in diameter; a round sheet is embedded in the middle layer hole channel, a protrusion extends out of the round sheet in the diameter direction, and the protrusion of the round sheet is matched with the groove of the middle layer hole channel. According to the structure, through accurate size matching, when the circular sheet moves to the position of the upper-layer hole channel, the hole channel can be completely sealed, and gas leakage is prevented. The problem that the permeation spray pipe is low in performance under the high-altitude working condition is solved by effectively controlling air flow exchange inside and outside the spray pipe, and the whole ballistic thrust performance of the permeation spray pipe is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of infiltration nozzles, and in particular relates to a infiltration wall structure of a variable diameter channel. Background Art

[0002] The altitude compensation nozzle is an advanced nozzle that adapts to environmental conditions at different flight altitudes through unique surface design or adaptive adjustment mechanism, thereby maintaining good thrust performance over a wide range of flight altitudes. With the continuous advancement of aerospace engineering technology, the research on altitude compensation nozzles has become increasingly important. Altitude compensation nozzles can not only significantly improve the power efficiency of aircraft, but also provide a solid technical foundation for cutting-edge aerospace technology fields such as space exploration.

[0003] Among the many altitude compensation nozzles, the penetration nozzle is an innovatively designed altitude compensation nozzle. Its core mechanism is to use materials or structures with permeability to form part of the expansion section wall of the nozzle, so that the gas can flow freely between the inside of the nozzle and the external environment. This design gives the penetration nozzle the ability to adapt to different flight altitudes and atmospheric conditions, and optimizes the nozzle thrust and combustion efficiency by automatically adjusting the internal flow characteristics. The penetration nozzle has a continuous profile, a simple structure, no complex mechanical system, and a good thrust compensation effect, showing significant application potential in the aerospace field. However, the performance of the penetration nozzle in high-altitude environments still has room for improvement. Utility Model Content

[0004] The utility model aims to solve the problem of poor high-altitude thrust performance of a permeable nozzle and provides a permeable wall structure of a variable-diameter channel, which can be used as the permeable wall of the permeable nozzle.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A permeable wall structure of a variable diameter channel, the structure comprising an upper layer channel, a middle layer channel, a lower layer channel and a circular sheet;

[0007] The upper channel is a circular channel;

[0008] The middle layer channel is a circular channel, and grooves are processed along the inner wall surface extending in opposite directions along both ends of the diameter, and the circular channel diameter of the middle layer channel is larger than the circular channel diameter of the upper layer channel;

[0009] The lower layer channel is an arc cross-shaped channel, and the arc portion has the same diameter as the middle layer channel;

[0010] A circular sheet is embedded in the middle layer channel, and a protrusion is extended from the circular sheet along the diameter direction. The protrusion of the circular sheet matches with the groove of the middle layer channel to realize the position limiting of the circular sheet.

[0011] Furthermore, the groove of the middle layer channel forms a certain angle with the arc cross channel of the lower layer channel, so as to limit the position of the middle sheet.

[0012] Furthermore, the groove of the middle layer channel is at an angle of 45° to the arc cross-shaped channel of the lower layer channel.

[0013] There are a large number of special-shaped channels distributed on the permeable wall. The channels are divided into three layers of different shapes. The upper layer is a circular channel, the middle layer is a circular channel with a larger diameter, and grooves are processed along the inner wall surface along the two ends of the diameter, which are at a certain angle with the arc cross channel below. The lower layer is an arc cross channel with the same diameter as the middle layer. In the channel of the middle layer, a circular thin sheet with a diameter between the diameters of the upper and lower layers is embedded, and the convex circular sheet extends along the diameter direction. The thin sheet can move up and down in the middle channel. When the thin sheet moves down to the position of the lower channel, because its diameter is smaller than the lower channel, the thin sheet cannot completely close the channel, thereby allowing the airflow to bypass the thin sheet and smoothly pass through the special-shaped channel. The design of the arc cross channel cleverly ensures that the thin sheet will not fall off accidentally; on the contrary, when the thin sheet moves to the position of the upper channel, because its diameter is larger than the diameter of the upper channel, it acts as an effective blocker, closing the channel and preventing the passage of airflow. The diameter of the hole is much larger than the wall thickness, and the circular hole in the middle layer and the protrusions on the thin sheet form a concave-convex structure to restrict the thin sheet, thereby preventing the thin sheet from turning over in the hole and causing sealing failure.

[0014] When the permeable wall structure is applied to the permeable nozzle, the upper layer of the permeable wall serves as the outer side of the nozzle, directly facing the external environment, while the lower channel is located on the inner side of the nozzle and connected to the inside of the nozzle. The structure uses special-shaped channels and built-in circular thin sheets with protrusions extending along the diameter direction to form a valve system that can realize the one-way flow function. Under low-altitude conditions, the pressure drop is relatively small, the ambient atmospheric pressure is greater than the internal pressure of the nozzle permeable wall, and the airflow dynamics causes the thin sheet to move to the position of the lower channel, and the airflow can bypass the thin sheet and enter the interior through the channel. Under high-altitude conditions, the pressure drop is relatively large, and the internal pressure of the permeable wall is greater than the ambient atmospheric pressure. The gas in the nozzle pushes the thin sheet upward to the position of the upper channel, closing the channel and effectively preventing the gas from leaking from the permeable wall to the outside.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. Reliable sealing performance: The structure of the utility model can completely seal the hole when the circular sheet moves to the upper hole position through precise size matching to prevent gas leakage.

[0017] 2. Stable structural design: The special shape and size design ensures the stability of the circular sheet during its movement in the channel, prevents the sheet from accidentally falling off, and enhances the reliability of the permeable wall structure.

[0018] 3. Strong environmental adaptability: The permeable wall structure can automatically adjust the air flow rate and its flow state at the permeable wall according to the changes in the external environmental pressure, so that the permeable nozzle can have better performance under different heights and different pressure conditions.

[0019] 4. Improve nozzle performance: By effectively controlling the airflow exchange inside and outside the nozzle, the problem of low performance of the penetration nozzle under high-altitude conditions is solved, and the full ballistic thrust performance of the penetration nozzle is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the permeable wall structure of the variable diameter channel, showing the overall structure of the permeable wall.

[0021] Figure 2 It is a schematic diagram of the pore structure, showing the specific shape of the pore structure.

[0022] Figure 3 It is a perspective view of the pore structure, showing the specific shape of the pore structure.

[0023] Figure 4 This is a cross-sectional view of a single channel, showing the positional relationship between the circular sheet and the channel structure.

[0024] Figure 5 This is a schematic diagram of the opening of the channel, showing the positional relationship between the circular sheet and the underlying channel when the channel is open.

[0025] Figure 6 This is a schematic diagram of the pore closure, showing the positional relationship between the circular sheet and the upper pore when the pore is closed.

[0026] Figure 7 The perspective view of the opening of the channel shows the shape matching relationship between the circular sheet and the underlying channel when the channel is open.

[0027] Figure 8 This is a simulation result diagram at an altitude of 30 kilometers. The upper half of the figure is the infiltration nozzle, and the lower half is the infiltration nozzle using a variable-diameter hole infiltration wall structure. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Embodiment 1:

[0030] according to Figure 1 The variable diameter channel permeable wall structure described in the utility model is characterized by having a large number of special-shaped channels with a diameter of millimeters distributed on the wall surface. In the description, in order to clearly show the channel characteristics, Figure 1The permeable wall structure is simplified into a flat plate shape. In fact, the permeable wall structure, as the expansion section of the nozzle, should be circular. In the application of the permeable nozzle, the upper layer of the permeable wall faces the external environment, while the lower layer of the hole is connected to the inside of the nozzle.

[0031] according to Figure 2 and Figure 3 The special-shaped channels on the permeable wall structure are divided into three layers with different shapes. The upper channel 1 is a circular channel, the middle channel 2 is a circular channel with a larger diameter, and grooves are processed along the inner wall surface extending in the opposite direction along both ends of the diameter. The lower channel 3 is an arc cross-shaped channel, and the arc part has the same diameter as the middle channel 2. The groove of the middle channel 2 is at a certain angle to the arc cross-shaped channel of the lower channel 3, so as to limit the position of the middle thin sheet.

[0032] according to Figure 4 A circular sheet 4 with protrusions extending in opposite directions along both ends of the diameter based on a circle is embedded in the middle layer channel 2. The protrusions cooperate with the grooves of the middle layer channel 2. The diameter of the sheet is between the diameters of the upper and lower layers. It can move up and down in the middle layer channel under the restriction of the middle layer groove.

[0033] according to Figure 5 and Figure 7 Under low-altitude working conditions, the pressure drop is relatively small, and the external atmospheric pressure is higher than the internal pressure of the nozzle. The external airflow flows into the nozzle under the action of the pressure difference, and the circular sheet moves to the lower channel position under the action of the airflow dynamics. Since the diameter of the sheet is smaller than the diameter of the lower arc cross channel, the channel cannot be completely closed, allowing the airflow to bypass the sheet and pass smoothly. The design of the arc cross channel cleverly prevents the accidental fall of the circular sheet.

[0034] according to Figure 6 and Figure 8 Under high-altitude working conditions, the pressure drop is relatively large, and the pressure inside the nozzle is higher than the external atmospheric pressure. The gas pushes the circular sheet to move upward to the upper channel position. Because the diameter of the circular sheet is larger than the diameter of the upper channel, the circular sheet acts as a blocker, closing the channel and effectively preventing the gas from leaking from the permeable wall.

[0035] In the actual processing process, the permeable wall structure of the variable diameter channel can be processed in two layers. After the middle layer channel is cut at the appropriate position, the circular sheet is placed at the predetermined position, and then the overall assembly is completed to ensure that the sheet is correctly installed in the middle layer channel.

[0036] according to Figure 8 At an altitude of 30 kilometers, the infiltration nozzle with a variable-diameter hole infiltration wall structure successfully solved the problem of internal airflow leakage from the infiltration section of the nozzle, ensuring that the gas in the nozzle can be completely discharged from the outlet and smoothly flow into the external environment.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. For example, the development of other variable-diameter channels or permeable wall structures that can achieve a one-way sealing function should also be considered within the scope of protection of the present invention.

Claims

1. A permeable wall structure of a variable diameter channel, characterized in that: The structure comprises an upper layer channel (1), a middle layer channel (2), a lower layer channel (3) and a circular sheet (4); The upper channel (1) is a circular channel; The middle layer channel (2) is a circular channel, and grooves are processed along the inner wall surface extending in opposite directions along both ends of the diameter, and the circular channel diameter of the middle layer channel (2) is larger than the circular channel diameter of the upper layer channel (1); The lower layer channel (3) is an arc cross-shaped channel, and the arc portion has the same diameter as the middle layer channel (2); A circular sheet (4) is embedded in the middle layer hole (2), and a protrusion extends from the circular sheet (4) along the diameter direction. The protrusion of the circular sheet (4) cooperates with the groove of the middle layer hole (2) to limit the position of the circular sheet (4).

2. The permeable wall structure of a variable diameter channel according to claim 1, characterized in that: The groove of the middle layer channel (2) forms a certain angle with the arc cross-shaped channel of the lower layer channel (3).

3. The permeable wall structure of a variable diameter channel according to claim 1, characterized in that: The groove of the middle layer channel (2) is at an angle of 45 degrees to the arc cross-shaped channel of the lower layer channel (3).

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