CN115899763A - Afterburning or punching press combustion chamber tail edge shear strengthening flame stabilizer - Google Patents
Afterburning or punching press combustion chamber tail edge shear strengthening flame stabilizer Download PDFInfo
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- CN115899763A CN115899763A CN202211514733.8A CN202211514733A CN115899763A CN 115899763 A CN115899763 A CN 115899763A CN 202211514733 A CN202211514733 A CN 202211514733A CN 115899763 A CN115899763 A CN 115899763A
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Abstract
The invention discloses a afterbody edge shearing strengthening flame stabilizer of a boosting or stamping combustion chamber, which adopts a central bluff body flame stabilizer, and lobe flow disturbing devices are arranged on the side walls of two sides of the flame stabilizer; the lobe flow disturbing device comprises a rectifying flat plate, lobes and n support plates; the rectifying flat plates are arranged on the outer sides of the side walls of the flame stabilizers in parallel; the n support plates are arranged between the rectifying flat plate and the side wall of the flame stabilizer in parallel at equal intervals, so that n-1 airflow channels are formed between the rectifying flat plate and the side wall of the flame stabilizer; the front end of the lobe is fixedly connected with the rear end of the rectifying flat plate. The invention enables the air flow flowing out of the air flow channel and the air flow outside the lobe to be mixed with each other, a flow direction vortex structure is formed at the downstream of the flame stabilizer, the propagation of hot combustion products in the backflow area to the main flow is enhanced, the combustion of an oil-gas mixture in the main flow is further promoted, and the combustion performance of an afterburner or a ram combustor is improved.
Description
Technical Field
The invention relates to the technical field of novel afterburner or ram combustor flame stabilizers, aims to improve the combustion performance of an afterburner or ram combustor, is mainly used as an afterburner or ram combustor flame stabilizer of an aircraft engine, and can also be used in other combustors such as an interstage combustor, a gas turbine combustor and the like.
Technical Field
The flame stabilizer of the afterburner or ram combustor comprises a V-shaped flame stabilizer, an evaporation tank flame stabilizer, a suction type flame stabilizer and the like. When the airflow flows through the flame stabilizer, a low-pressure area is formed behind the stabilizer, so that the flow direction of part of the airflow is deflected, and a backflow area is formed behind the stabilizer. The fuel oil is sprayed out by the oil supply system and then mixed with air to form an oil-gas mixture, and the oil-gas mixture is sucked into the backflow area and ignited in the backflow area when flowing through the stabilizer. The hot combustion products generated by combustion are transported to the upstream to continue igniting the fresh oil-gas mixture under the action of the backflow zone, so that stable combustion is realized.
As aeronautical technologies develop further, the performance requirements of higher flying Ma and higher flying altitude of the aircraft need to be met, which requires that afterburners or ram-type combustors have higher combustion performance. But at the same time, the combustor inlet conditions become extremely severe, making high performance afterburner or ramjet combustor flame stabilizer designs challenging: 1. under the condition of high inlet airflow speed, the efficient and stable combustion of the combustion chamber is difficult to maintain. The high inlet gas flow velocity results in an increase in the velocity of the fuel droplets moving with the gas flow in the combustion chamber, which greatly reduces the residence time of the fuel droplets in the stabilizer recirculation zone. When the residence time is reduced, it can present a significant challenge to the ignition and flame holding performance of the stabilizer. Meanwhile, the flame propagation and material exchange from the back flow region of the stabilizer to the main flow become difficult due to the overlarge main flow speed, and a large amount of fuel oil droplets in the main flow are not timely involved in combustion and are taken away by the main flow, so that the combustion efficiency is low. 2. The reduction of the inlet oxygen content causes a reduction in the combustion reaction rate and a reduction in the combustion efficiency. As aircraft flight altitudes have increased and engine thrust requirements have increased further, inlet temperatures of afterburners or ram combustors have increased, which in turn has resulted in a dramatic decrease in the oxygen content of the combustor inlet air stream. Conventional afterburner stabilizers are difficult to meet design requirements in order to maintain high combustion efficiency at such inlet conditions. 3. And the flow loss of the combustion chamber is reduced while high-efficiency combustion is maintained. For an afterburner or ramjet combustor, increasing engine thrust is achieved primarily by increasing combustion efficiency and reducing flow resistance of the combustor. However, for the conventional flame stabilizer, the increase of the combustion efficiency also brings the increase of the total pressure loss of the combustion chamber, and the higher total pressure loss is difficult to meet the performance requirements of the increasingly higher boost or ram combustion chamber.
Therefore, there is a need for an afterburner and ram combustor that can enhance the mass exchange between the recirculation zone and the main stream and enhance the combustion of the main stream while maintaining flame stability, thereby maintaining high combustion efficiency at high-velocity lean oxygen inlet conditions. Thereby further meeting the performance requirements of advanced boosting and a stamping combustion chamber in the future.
Disclosure of Invention
The invention aims to solve the technical problem of providing a tail edge shear-enhanced flame stabilizer of an afterburner or a ram combustor aiming at the design challenge involved in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a thrust augmentation or stamping combustion chamber trailing edge shear intensification flame holder, the flame holder adopts the bluff body flame holder of the centre, there are lobe spoilers on its both sides sidewall;
the lobe spoiler device comprises a rectifying flat plate, lobes and n support plates, wherein n is a natural number more than or equal to 2;
the rectifying flat plate is a rectangular plate, and the width of the rectifying flat plate is the same as that of the side walls on the two sides of the flame stabilizer;
the rectifying flat plate is arranged on the outer side of the side wall of the flame stabilizer and is parallel to the side wall of the flame stabilizer; the n support plates are arranged between the rectifying flat plate and the side wall of the flame stabilizer in parallel at equal intervals, one end of each support plate is fixedly connected with the rectifying flat plate, and the other end of each support plate is fixedly connected with the side wall of the flame stabilizer, so that n-1 airflow channels are formed between the rectifying flat plate and the side wall of the flame stabilizer;
the lobe and the rectifying flat plate are the same in width, the front end of the lobe is fixedly connected with the rear end of the rectifying flat plate, and the lobe and the rectifying flat plate are used for enabling airflow flowing out of the airflow channel and airflow outside the lobe to be mixed with each other, a flow direction vortex structure is formed at the downstream of the flame stabilizer, hot combustion products in the backflow area are enhanced to be transmitted to the main flow, combustion of the oil-gas mixture in the main flow is further promoted, and the combustion performance of the afterburner or the ram combustor is improved.
As a further optimization scheme of the afterburner or ramjet combustor trailing edge shear strengthening flame stabilizer, the flame stabilizer adopts bluff body type flame stabilizers such as a V-shaped flame stabilizer, an evaporation tank flame stabilizer, a suction type flame stabilizer and the like.
As a further optimization scheme of the afterburner tail edge shear strengthening flame stabilizer for the afterburner, n is 3.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. according to the invention, the lobe turbulent flow device is used for enhancing the interaction between the backflow region at the downstream of the stabilizer and the main flow, and promoting the transfer of hot combustion products from the backflow region to the main flow, so that the combustion of an oil-gas mixture in the main flow is promoted. The purpose of improving the combustion performance of the afterburner by means of boosting or punching is achieved under the inlet conditions of high inlet speed and low oxygen content.
2. The invention has simple structure and excellent performance, reduces the total pressure loss of the combustion chamber and widens the flameout boundary of the combustion chamber.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a lobed turbulator of the present invention;
FIG. 3 is a schematic cross-sectional view of the present invention;
FIG. 4 is a schematic rear view of a lobed turbulator in the present invention;
FIG. 5 is a side view of a lobed turbulator in the present invention.
In the figure, 1-the central bluff body flame holder, 2-the lobes, 3-the fairing plates, 4-the struts, 5-the sidewalls of the central bluff body flame holder.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as 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.
As shown in FIG. 1, the invention discloses a afterbody edge shear strengthening flame stabilizer of an afterbody or ram combustion chamber, which adopts a central blunt body flame stabilizer, and lobe flow disturbing devices are arranged on the side walls of both sides of the flame stabilizer;
as shown in fig. 2, the lobe spoiler comprises a rectifying flat plate, lobes and n support plates, wherein n is a natural number greater than or equal to 2;
the rectifying flat plate is a rectangular plate, and the width of the rectifying flat plate is the same as that of the side walls on the two sides of the flame stabilizer;
as shown in fig. 1 and 3, the flat flow straightener is arranged outside the side wall of the flame holder and is parallel to the side wall of the flame holder; the n support plates are arranged between the rectifying flat plate and the side wall of the flame stabilizer in parallel at equal intervals, one end of each support plate is fixedly connected with the rectifying flat plate, and the other end of each support plate is fixedly connected with the side wall of the flame stabilizer, so that n-1 airflow channels are formed between the rectifying flat plate and the side wall of the flame stabilizer;
the lobe and the rectifying flat plate are the same in width, the front end of the lobe is fixedly connected with the rear end of the rectifying flat plate, and the lobe and the rectifying flat plate are used for enabling airflow flowing out of the airflow channel and airflow outside the lobe to be mixed with each other, a flow direction vortex structure is formed at the downstream of the flame stabilizer, hot combustion products in the backflow area are enhanced to be transmitted to the main flow, combustion of the oil-gas mixture in the main flow is further promoted, and the combustion performance of the afterburner or the ram combustor is improved.
The flame stabilizer adopts V-shaped flame stabilizer, evaporation tank flame stabilizer, suction type flame stabilizer and other bluff body flame stabilizers, and n is preferably 3.
As shown in fig. 4 and 5, the structural parameters of the lobe are as follows: the length of the rectification flat plate is a, the lobe extension length is a, the airflow channel height is b, and the length of the rectification flat plate is i.
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 one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A thrust augmentation or stamping combustion chamber trailing edge shear intensification flame holder is characterized in that the flame holder adopts a central bluff body flame holder, and lobe turbulence devices are arranged on the side walls of two sides of the central bluff body flame holder;
the lobe spoiler device comprises a rectifying flat plate, lobes and n support plates, wherein n is a natural number more than or equal to 2;
the rectifying flat plate is a rectangular plate, and the width of the rectifying flat plate is the same as that of the side walls on the two sides of the flame stabilizer;
the rectifying flat plate is arranged on the outer side of the side wall of the flame stabilizer and is parallel to the side wall of the flame stabilizer; the n support plates are arranged between the rectifying flat plate and the side wall of the flame stabilizer in parallel at equal intervals, one end of each support plate is fixedly connected with the rectifying flat plate, and the other end of each support plate is fixedly connected with the side wall of the flame stabilizer, so that n-1 airflow channels are formed between the rectifying flat plate and the side wall of the flame stabilizer;
the lobe and the rectifying flat plate are the same in width, the front end of the lobe is fixedly connected with the rear end of the rectifying flat plate, and the lobe and the rectifying flat plate are used for enabling airflow flowing out of the airflow channel and airflow outside the lobe to be mixed with each other, a flow direction vortex structure is formed at the downstream of the flame stabilizer, hot combustion products in the backflow area are enhanced to be transmitted to the main flow, combustion of the oil-gas mixture in the main flow is further promoted, and the combustion performance of the afterburner or the ram combustor is improved.
2. The afterburner or ramjet combustor trailing edge shear enhanced flame holder of claim 1, wherein the flame holder is a bluff body type flame holder such as a V-shaped flame holder, an evaporative slot flame holder, a slot-in slot flame holder, or the like.
3. The afterburner or ramjet combustor trailing edge shear enhanced flame stabilizer of claim 1, wherein n is 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211514733.8A CN115899763A (en) | 2022-11-30 | 2022-11-30 | Afterburning or punching press combustion chamber tail edge shear strengthening flame stabilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211514733.8A CN115899763A (en) | 2022-11-30 | 2022-11-30 | Afterburning or punching press combustion chamber tail edge shear strengthening flame stabilizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115899763A true CN115899763A (en) | 2023-04-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211514733.8A Pending CN115899763A (en) | 2022-11-30 | 2022-11-30 | Afterburning or punching press combustion chamber tail edge shear strengthening flame stabilizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115899763A (en) |
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2022
- 2022-11-30 CN CN202211514733.8A patent/CN115899763A/en active Pending
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