A flame stabilizer for afterburner or ramjet combustion chamber with adjustable slot width

Abstract

The present invention discloses a slot-width-adjustable flame stabilizer for an afterburner or ramjet combustion chamber, comprising a central bluff flame stabilizer, a first adjustment unit, and a second adjustment unit. The central bluff flame stabilizer has symmetrical upper and lower wall surfaces between its head and trailing edges. The first and second adjustment units are symmetrically arranged on the upper and lower wall surfaces, forming a first adjustment module and a second adjustment module. The first and second adjustment modules have identical structures, each comprising a first wall plate, a second wall plate, a rectifier plate, m support plates, n adjustment plates, a rotating shaft, and a drive unit. The drive unit comprises an adjustment oil pipe and p pistons. The present invention adjusts the oil pressure within the adjustment oil circuit to drive the piston rods of each piston, thereby adjusting the opening and closing degree of the n adjustment plates to meet the design requirements of total pressure loss and combustion performance under different afterburner or ramjet combustion chamber operating conditions.

Description

Technical Field

[0001] This invention relates to the technical field of novel afterburner or ramjet combustor flame stabilizers. Its purpose is to balance the design requirements of total pressure loss and combustion performance in afterburner or ramjet combustors, thereby improving the overall performance of the combustor. While primarily used as a flame stabilizer for afterburner or ramjet combustors in aircraft engines, it can also be used in other combustors, such as interstage combustors and gas turbine combustors. Technical Background

[0002] As a critical component of an aircraft engine, the combustion performance of an afterburner or ramjet combustor directly impacts the aircraft's flight performance and safety. Within the high-speed airflow of the afterburner / ramjet combustor, the flame stabilizer stabilizes and maintains flame stability. The flame stabilizer, through a recirculation zone behind it, carries hot combustion products from upstream combustion back to the stabilizer's trailing edge, igniting a fresh fuel-air mixture. This cycle repeats, maintaining stable flame combustion. Simultaneously, the combustion products in the recirculation zone propagate through the shear layer toward the main flow, igniting the fuel-air mixture in the main flow.

[0003] As defense needs continue to rise, higher requirements are being placed on aircraft flight speeds and altitudes. This demands that afterburner or ramjet combustors maintain high combustion efficiency and flame stability under increasingly challenging inlet conditions. For future advanced afterburner / ramjet combustors, increasing inlet velocity shortens the fuel's residence time in the combustor, resulting in reduced combustion efficiency and flame stability. Furthermore, reduced inlet oxygen levels reduce chemical reaction rates, leading to ignition difficulties and reduced combustion efficiency. An effective approach to addressing the poor combustion performance of afterburner or ramjet combustors under high-speed, oxygen-depleted inlet conditions is to increase the slot width of the flame stabilizer. Increasing the slot width of the flame stabilizer increases the size of the recirculation zone behind the stabilizer, extending the fuel's residence time in the recirculation zone and facilitating ignition and flame stability. Furthermore, a wider slot width facilitates the propagation of the flame behind the stabilizer into the main flow, igniting a larger portion of the fuel-air mixture in the main flow and improving combustion efficiency. However, increasing the slot width inevitably introduces another issue: increased total pressure loss within the combustion chamber. Increased total pressure loss means greater flow resistance, which leads to a decrease in thrust in the afterburner or ramjet, thus affecting the overall performance of the engine. Therefore, future advanced afterburner or ramjet combustors face a dilemma between higher combustion performance under high-speed, oxygen-depleted inlet conditions and lower total pressure loss. How to adapt the stabilizer to different combustion chamber operating conditions while maintaining a relatively simple structure and low weight, and balancing combustion performance and total pressure loss requirements, is a technical challenge that future advanced afterburner or ramjet combustors need to address.

[0004] Therefore, it is very necessary to make improvements to the afterburner and ramjet combustion chambers so that they can change the slot width of the flame stabilizer, adapt to the design requirements of total pressure loss and combustion performance under different afterburner or ramjet combustion chamber operating conditions, meet the performance indicators of future advanced afterburner or ramjet combustion chambers, and improve the overall performance of the combustion chamber. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a flame stabilizer for an afterburner or ramjet combustion chamber with adjustable slot width in response to the design challenges involved in the background technology.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A flame stabilizer for an afterburner or ramjet combustion chamber with adjustable slot width, comprising a central bluff flame stabilizer, a first regulating unit and a second regulating unit;

[0008] The central bluff flame stabilizer has symmetrical upper and lower wall surfaces between its head and trailing edge, both comprising a first wall plate and a second wall plate. The upstream of the first wall plate is fixedly connected to the head of the central bluff flame stabilizer, and the downstream of the first wall plate is fixedly connected to the upstream of the second wall plate; the downstream of the second wall plate is fixedly connected to the trailing edge of the central bluff flame stabilizer.

[0009] The second wall plates of the upper wall surface and the lower wall surface are arranged in parallel, and the distance between the first wall plates of the upper wall surface and the lower wall surface gradually increases from upstream to downstream;

[0010] The first regulating unit and the second regulating unit are symmetrically arranged on the upper wall surface and the lower wall surface to form a first regulating module and a second regulating module;

[0011] The first adjustment module and the second adjustment module have the same structure, and both include a first wall plate, a second wall plate, a rectifying plate, m support plates, n adjustment plates, a rotating shaft, and a drive unit, where m and n are both natural numbers greater than or equal to 1; the upper wall surface of the central blunt body flame stabilizer is the first wall plate and the second wall plate in the first adjustment module, and the lower wall surface is the first wall plate and the second wall plate in the second adjustment module;

[0012] In the first adjustment module and the second adjustment module:

[0013] The m support plates are equidistantly arranged between the second wall plate and the straightening plate and parallel to the flow direction, with their upper ends fixedly connected perpendicularly to the straightening plate and their lower ends fixedly connected perpendicularly to the outer wall of the second wall plate, so that the straightening plate is parallel to the second wall plate; the downstream end of the straightening plate is aligned with the trailing edge of the central bluff flame stabilizer, and the length of the straightening plate in the flow direction is greater than that of the second wall plate;

[0014] The rotation axis is fixed perpendicular to the flow direction at an upstream end of the first wall plate;

[0015] The n adjustment plates are pivotally connected to the rotation axis in sequence, and can freely rotate along the rotation axis between the first wall plate and the rectifying plate between the first adjustment module, and when rotated to the maximum angle, the ends of the adjustment plates away from the rotation axis abut against the rectifying plate; adjacent adjustment plates are clearance-fitted;

[0016] The regulating plate is evenly provided with a plurality of air inlet holes;

[0017] The drive unit includes an adjusting oil pipe and p pistons, where p is a natural number greater than or equal to 2n. The p pistons are equidistantly arranged on the adjusting oil pipe, and the bottoms of the piston cylinders of the pistons are fixedly connected to the adjusting oil pipe, and a through hole is provided between the bottoms of the piston cylinders and the adjusting oil pipe.

[0018] The first wall plate is provided with p mounting holes corresponding to the pistons in a direction perpendicular to the flow direction;

[0019] The regulating oil pipe is arranged in the central bluff flame stabilizer; the piston cylinders of the p pistons are fixed in the p mounting holes on the first wall plate in a one-to-one correspondence, and the piston rods of the p pistons extend out of the p mounting holes in a one-to-one correspondence and abut against the n regulating plates;

[0020] Both ends of the regulating oil pipe are connected to the oil supply system of the afterburner or ramjet combustion chamber, and are used to adjust the opening and closing degree of the n regulating plates by adjusting the oil pressure in the piston cylinder of the piston.

[0021] As a further optimization solution of the afterburner or ramjet combustion chamber flame stabilizer with adjustable slot width of the present invention, the central blunt body flame stabilizer adopts any one of a V-shaped flame stabilizer, an evaporation tank flame stabilizer, and an inhalation flame stabilizer.

[0022] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0023] The present invention changes the slot width of the flame stabilizer by controlling the expansion and folding of the adjustment plate, thereby adapting to the design requirements of total pressure loss and combustion performance under different afterburner or ramjet combustion chamber operating conditions, and can meet the performance indicators of future advanced afterburner or ramjet combustion chambers and improve the overall performance of the combustion chamber.

[0024] The regulating device of the present invention is relatively simple, and the opening and closing of the regulating plate is controlled by controlling the oil amount in the regulating oil pipe. The regulating scheme is easy to implement in the afterburner or ramjet combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the adjustment plate in the present invention;

[0027] Figure 3 Schematic diagram of the structure of the drive unit in the present invention;

[0028] Figure 4 It is a schematic structural diagram of the driving unit and the first wall plate in the present invention;

[0029] Figure 5 It is a cross-sectional schematic diagram of the adjustment plate of the present invention when it is expanded to the maximum;

[0030] Figure 6 It is a cross-sectional schematic diagram of the adjustment plate and the first wall panel of the present invention when they are attached.

[0031] In the figure, 1-central blunt body flame stabilizer, 2-adjusting plate, 3-air inlet, 4-rectifier plate, 5-support plate, 6-adjusting oil pipe, 7-rotating shaft, 8-piston. Implementation Method

[0032] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings:

[0033] The present invention can be implemented in many different forms and should not be considered limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0034] like Figure 1 As shown, the present invention discloses a flame stabilizer for an afterburner or ramjet combustion chamber with adjustable slot width, comprising a central blunt body flame stabilizer, a first regulating unit and a second regulating unit;

[0035] The central bluff flame stabilizer has symmetrical upper and lower wall surfaces between its head and trailing edge, both comprising a first wall plate and a second wall plate. The upstream of the first wall plate is fixedly connected to the head of the central bluff flame stabilizer, and the downstream of the first wall plate is fixedly connected to the upstream of the second wall plate; the downstream of the second wall plate is fixedly connected to the trailing edge of the central bluff flame stabilizer.

[0036] The second wall plates of the upper wall surface and the lower wall surface are arranged in parallel, and the distance between the first wall plates of the upper wall surface and the lower wall surface gradually increases from upstream to downstream;

[0037] The first regulating unit and the second regulating unit are symmetrically arranged on the upper wall surface and the lower wall surface to form a first regulating module and a second regulating module;

[0038] The first adjustment module and the second adjustment module have the same structure, and both include a first wall plate, a second wall plate, a rectifying plate, m support plates, n adjustment plates, a rotating shaft, and a drive unit, where m and n are both natural numbers greater than or equal to 1; the upper wall surface of the central blunt body flame stabilizer is the first wall plate and the second wall plate in the first adjustment module, and the lower wall surface is the first wall plate and the second wall plate in the second adjustment module;

[0039] In the first adjustment module and the second adjustment module:

[0040] The m support plates are equidistantly arranged between the second wall plate and the straightening plate and parallel to the flow direction, with their upper ends fixedly connected perpendicularly to the straightening plate and their lower ends fixedly connected perpendicularly to the outer wall of the second wall plate, so that the straightening plate is parallel to the second wall plate; the downstream end of the straightening plate is aligned with the trailing edge of the central bluff flame stabilizer, and the length of the straightening plate in the flow direction is greater than that of the second wall plate;

[0041] The rotation axis is fixed perpendicular to the flow direction at an upstream end of the first wall plate;

[0042] The n adjustment plates are pivotally connected to the rotation axis in sequence, and can freely rotate along the rotation axis between the first wall plate and the rectifying plate between the first adjustment module, and when rotated to the maximum angle, the ends of the adjustment plates away from the rotation axis abut against the rectifying plate; adjacent adjustment plates are clearance-fitted;

[0043] The regulating plate is evenly provided with a number of air inlet holes, such as Figure 2 As shown;

[0044] like Figure 3 As shown, the drive unit includes an adjusting oil pipe and p pistons, where p is a natural number greater than or equal to 2n. The p pistons are equidistantly arranged on the adjusting oil pipe, and the bottoms of the piston cylinders of the pistons are fixedly connected to the adjusting oil pipe, and a through hole is provided between the bottoms of the piston cylinders and the adjusting oil pipe.

[0045] The first wall plate is provided with p mounting holes corresponding to the pistons in a direction perpendicular to the flow direction;

[0046] The regulating oil pipe is arranged in the central bluff flame stabilizer; the piston cylinders of the p pistons are fixed in the p mounting holes on the first wall plate in a one-to-one correspondence, and the piston rods of the p pistons extend out of the p mounting holes in a one-to-one correspondence and abut against the n regulating plates, such as Figure 4 As shown;

[0047] Both ends of the regulating oil pipe are connected to the oil supply system of the afterburner or ramjet combustion chamber, and are used to adjust the opening and closing degree of the n regulating plates by adjusting the oil pressure in the piston cylinder of the piston.

[0048] The central blunt body flame stabilizer adopts any one of a V-shaped flame stabilizer, an evaporation tank flame stabilizer and an inhalation flame stabilizer.

[0049] When oil is supplied to the regulating oil circuit, the piston rods of each piston extend under the action of oil pressure, and each regulating plate is lifted up until it contacts the rectifier plate. At this time, the flame stabilizer slot width is the largest, meeting the performance requirements of afterburner or ramjet combustion chamber under high oil-gas ratio conditions, such as Figure 5As shown; when the fuel in the regulating oil circuit is extracted, the piston rods of each piston are retracted, and each regulating plate fits with the first wall plate. At this time, the flame stabilizer slot width is minimum, meeting the performance requirements of the afterburner or ramjet combustion chamber with a small oil-gas ratio working condition or when not working, such as Figure 6 shown.

[0050] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art in the art to which this invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as such, will not be interpreted in an idealized or overly formal sense.

[0051] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flame stabilizer for an afterburner or ramjet combustion chamber with adjustable slot width, characterized in that: It includes a central blunt flame stabilizer, a first regulating unit and a second regulating unit; The central bluff flame stabilizer has symmetrical upper and lower wall surfaces between its head and trailing edge, both comprising a first wall plate and a second wall plate. The upstream of the first wall plate is fixedly connected to the head of the central bluff flame stabilizer, and the downstream of the first wall plate is fixedly connected to the upstream of the second wall plate; the downstream of the second wall plate is fixedly connected to the trailing edge of the central bluff flame stabilizer. The second wall plates of the upper wall surface and the lower wall surface are arranged in parallel, and the distance between the first wall plates of the upper wall surface and the lower wall surface gradually increases from upstream to downstream; The first regulating unit and the second regulating unit are symmetrically arranged on the upper wall surface and the lower wall surface to form a first regulating module and a second regulating module; The first adjustment module and the second adjustment module have the same structure, and both include a first wall plate, a second wall plate, a rectifying plate, m support plates, n adjustment plates, a rotating shaft, and a drive unit, where m and n are both natural numbers greater than or equal to 1; the upper wall surface of the central blunt body flame stabilizer is the first wall plate and the second wall plate in the first adjustment module, and the lower wall surface is the first wall plate and the second wall plate in the second adjustment module; In the first adjustment module and the second adjustment module: The m support plates are equidistantly arranged between the second wall plate and the straightening plate and parallel to the flow direction, with their upper ends fixedly connected perpendicularly to the straightening plate and their lower ends fixedly connected perpendicularly to the outer wall of the second wall plate, so that the straightening plate is parallel to the second wall plate; the downstream end of the straightening plate is aligned with the trailing edge of the central bluff flame stabilizer, and the length of the straightening plate in the flow direction is greater than that of the second wall plate; The rotation axis is fixed perpendicular to the flow direction at an upstream end of the first wall plate; The n adjustment plates are pivotally connected to the rotation axis in sequence, and can freely rotate along the rotation axis between the first wall plate and the rectifying plate, and when rotated to the maximum angle, the ends thereof away from the rotation axis abut against the rectifying plate; adjacent adjustment plates are clearance-fitted; The regulating plate is evenly provided with a plurality of air inlet holes; The drive unit includes an adjusting oil pipe and p pistons, where p is a natural number greater than or equal to 2n. The p pistons are equidistantly arranged on the adjusting oil pipe, and the bottoms of the piston cylinders of the pistons are fixedly connected to the adjusting oil pipe, and a through hole is provided between the bottoms of the piston cylinders and the adjusting oil pipe. The first wall plate is provided with p mounting holes corresponding to the pistons in a direction perpendicular to the flow direction; The regulating oil pipe is arranged in the central bluff flame stabilizer; the piston cylinders of the p pistons are fixed in the p mounting holes on the first wall plate in a one-to-one correspondence, and the piston rods of the p pistons extend out of the p mounting holes in a one-to-one correspondence and abut against the n regulating plates; Both ends of the regulating oil pipe are connected to the oil supply system of the afterburner or ramjet combustion chamber, and are used to adjust the opening and closing degree of the n regulating plates by adjusting the oil pressure in the piston cylinder of the piston.

2. The afterburner or ramjet combustion chamber flame stabilizer with adjustable slot width according to claim 1, characterized in that: The central blunt body flame stabilizer adopts any one of a V-shaped flame stabilizer, an evaporation tank flame stabilizer and an inhalation flame stabilizer.

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