CN110907212A - Multifunctional test platform for researching interaction of sound waves and flames - Google Patents
Multifunctional test platform for researching interaction of sound waves and flames Download PDFInfo
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- CN110907212A CN110907212A CN201911281521.8A CN201911281521A CN110907212A CN 110907212 A CN110907212 A CN 110907212A CN 201911281521 A CN201911281521 A CN 201911281521A CN 110907212 A CN110907212 A CN 110907212A
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Abstract
The invention discloses a multifunctional test platform for researching interaction of sound waves and flames, which comprises a bracket and a supporting plate fixedly arranged at the top of the bracket, and further comprises: the transition section is used for transitionally connecting the loudspeaker and the rectifying component; at least two turbulence bar mounting holes are formed in the side surface of the combustion chamber; a fairing assembly including a perforated fairing for producing a planar flame; the turbulent bar assembly is used for generating the shear layer flame. The multifunctional test platform provided by the invention is respectively provided with the porous rectifying plate, the turbulence rod assembly and the burner, the three parts are replaced and combined to generate plane flame, shear layer flame and jet flow flame, and different sound wave disturbances applied by the bottom loudspeaker are combined, so that the research on the interaction of sound waves and flame aiming at the plane flame, the shear layer flame, the jet flow flame and the like is realized, and the requirements of different researches on the same test platform are met; and the whole device has simple structure, is convenient to process and greatly reduces the cost.
Description
Technical Field
The invention relates to the technical field of test platforms, in particular to a multifunctional test platform for researching interaction of sound waves and flames.
Background
The unstable combustion is one of the difficult problems which troubles the development of rocket engines and aeroengines, the unstable combustion is usually accompanied by the fluctuation of pressure and heat release with larger amplitude, when the unstable heat release and the acoustic characteristic of a combustion chamber structure are positively fed back, the thermoacoustic oscillation is generated, the heat release and the pressure pulsation are further enhanced, and the combustion chamber and the like are easily damaged greatly. In order to deeply research the mechanism of the unstable generation of thermoacoustic, a large number of experimental researches on the sound wave-flame interaction are carried out by different scholars at home and abroad.
In the current experimental platform common in academia, a loudspeaker is mostly adopted to apply acoustic disturbance to a combustion chamber. In related experimental research, sound waves mainly act on jet flow flame, and flame response characteristics under different frequencies and different sound pressure levels are researched.
Experimental devices for the interaction of sound waves and swirling flames are given in the article "Experimental induction of the effects of hydrogen content on the comfort inertia of methane/hydrogen lean mixture frequency transmissions". The experimental device consists of a loudspeaker, a combustion chamber and a cyclone burner, and is mainly used for researching the interaction between sound waves and cyclone flame, and the interaction between the sound waves and jet flow flame can also be researched after the burner is replaced.
The paper "Response of non-premixed flames-stabilized flames to acoustical stimuli and jet in cross-flow flames" uses the installation of burners in the wall of the combustion chamber to study the mechanism of the interaction of sound waves and flames. The device is mainly used for researching the interaction of sound waves with swirling flow and jet flow flame.
The article "Visualization of Shear Layer Dynamics in a transduction ForcedFlow and Flame" shows a device for influencing Flame by transverse acoustic wave excitation, which can realize the research of influence of transverse excitation on Flame. The subject of the device is still a jet flame.
The experimental platform for the interaction of sound waves and flames has various forms at present, but the interaction of the sound waves and jet flames is still the most widely applied at present. However, the flame forms are various, such as plane flame and shear layer flame, but the current experimental platform is mainly designed for one flame type, and has single function and large limitation, so that the design of a universal experimental platform has very important significance.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the multifunctional test platform can be used for carrying out interaction research of sound waves and flames aiming at different types of flames.
In order to solve the technical problems, the invention is realized by the following technical scheme: a multifunctional test platform for sound wave and flame interaction research, includes support and fixed mounting in the backup pad at support top still includes:
the transition section is fixedly arranged in the middle of the supporting plate and is used for transitionally connecting the loudspeaker and the rectifying component;
the combustion chamber is fixedly arranged at the top of the rectifying assembly, and the side surface of the combustion chamber is provided with at least two turbulence bar mounting holes;
a fairing assembly including a porous fairing plate coupled to the combustion chamber for generating a planar flame;
the turbulence bar assembly is installed in the turbulence bar mounting hole and combined with the combustion chamber to generate shear layer flame.
Further, the test platform can also comprise a burner which is arranged in a combustion chamber, the burner is combined with the combustion chamber to generate jet flame, and the porous rectifying plate or the turbulent rod assembly is replaced when sound wave and jet flame interaction research is carried out;
one end of the burner is provided with a spray hole for ejecting flame, and the other end of the burner is provided with a connector for fixing the burner.
Furthermore, at least a first turbulence bar mounting hole and a second turbulence bar mounting hole are formed in the side face of the combustion chamber, and turbulence bar assemblies are respectively mounted in the first turbulence bar mounting hole and the second turbulence bar mounting hole.
Further, the spoiler bar assembly at least comprises a first spoiler bar assembly and a second spoiler bar assembly, the first spoiler bar assembly is installed in the first spoiler bar mounting hole, and the second spoiler bar assembly is installed in the second spoiler bar mounting hole.
Further, place in first vortex stick subassembly in including in the combustion chamber first vortex stick, the first double-screw bolt of first vortex stick one end fixed connection, first double-screw bolt with the excellent mounting hole threaded connection of first vortex and tip cup joint and are used for spacing nut.
Further, place in the second vortex stick subassembly in including the combustion chamber second vortex stick, the second vortex stick one end fixed connection second double-screw bolt, the second double-screw bolt with the excellent mounting hole threaded connection of second vortex and tip cup joint and are used for spacing nut.
Further, the rectification subassembly is still established including the cover the fairing in the porous cowling outside, the fairing is close to one side cooperation of combustion chamber is connected the rectification apron, be provided with the rectification gasket between porous cowling panel and the rectification apron, between porous cowling panel and the fairing.
Further, porous cowling panel includes the cowling panel main part, set up the rectification through-hole that runs through and evenly arrange along thickness direction on the cowling panel main part.
Further, the transition section comprises a round-square section and a horn section which are fixedly connected with each other, wherein,
the circular-to-square section comprises a circular-to-square section top plate with the top surface abutting against the rectifying assembly, the edge of the circular-to-square section top plate is fixedly connected with the combustion chamber, a square opening is formed in the middle of the circular-to-square section top plate, the circular opening extends towards one side of the loudspeaker to form a circular opening, the circular opening is located in the middle of the circular-to-square section bottom plate, and the edge of the circular-to-square section bottom plate is fixedly connected with the horn section;
the loudspeaker section supports and fixed connection including the top surface the loudspeaker section roof of circle square section bottom plate, the middle part of loudspeaker section roof open have with the round hole of circle mouth butt joint and to loudspeaker one side extends and forms the horn mouth, install horn mouth bottom the speaker.
Furthermore, the cross section of the first turbulence bar is circular, and the cross section of the second turbulence bar is triangular.
Compared with the prior art, the invention has the advantages that:
according to the multifunctional test platform provided by the invention, the interaction research of sound waves and flames of different types is realized by increasing and decreasing the parts of the test platform, in order to generate the flames of different types, the porous rectifying plate, the turbulence bar assembly and the burner are respectively designed, the three parts are replaced and combined to generate plane flames, shear layer flames and jet flames, and the interaction research of the sound waves and the flames is realized aiming at the plane flames, the shear layer flames, the jet flames and the like by combining different sound wave disturbances applied by a loudspeaker arranged at the bottom, so that the requirements of developing different researches on the same test platform are met; and the whole device has simple structure, is convenient to process and greatly reduces the cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a multi-functional test platform for acoustic wave and flame interaction studies;
FIG. 2 is a schematic structural view of a first spoiler bar assembly;
FIG. 3 is a schematic structural view of a second spoiler assembly;
FIG. 4 is a schematic structural diagram of a rectifier assembly;
FIG. 5 is a schematic view of the internal structure of FIG. 4;
FIG. 6 is a schematic view of a porous fairing;
FIG. 7 is a schematic view of a burner configuration;
FIG. 8 is a schematic structural view of a circle-square segment;
FIG. 9 is a schematic view of the construction of a horn section;
FIG. 10 is a graph of the results of acoustic wave interaction with jet flame;
FIG. 11 is one of the graphs of the results of the interaction of the acoustic wave with a flat flame;
FIG. 12 is a second graph of the results of the acoustic wave interaction with a flat flame;
1. a combustion chamber; 2. a first spoiler bar assembly; 3. a second spoiler bar assembly; 4. a rectifying component; 5. a transition section; 6. fastening screws; 7. a support leg; 8. a nut; 9. a support plate; 10. Spraying a hole; 11. an interface; 21. a first spoiler bar; 22. a first stud; 31. a second spoiler bar; 32. a second stud; 41. a flow-regulating sleeve; 42. a rectification cover plate; 43. a porous rectifying plate; 44. A rectifying pad; 431. a rectifying plate main body; 432. a rectifying through hole; 51. a circular-to-square section top plate; 52. a circular-to-square section bottom plate; 53. square opening; 54. a round mouth; 55. a horn section top plate; 56. a bell mouth.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Example one
A multifunctional test platform for the interaction research of sound waves and flames as shown in fig. 1-6, comprising a support 7 and a support plate 9 fixedly installed on the top of the support 7, wherein the support 7 and the support plate 9 can be fixed by welding or bolt assembly connection, and the test platform further comprises:
the transition section 5 is fixedly arranged in the middle of the supporting plate 9 through a bolt assembly and is used for transitionally connecting the loudspeaker with the rectifying assembly 4, and particularly, the top of the transition section 5 is connected with the rectifying assembly 4, and the bottom of the transition section is connected with the loudspeaker;
the combustion chamber 1 is fixedly installed at the top of the rectifying assembly 4, at least two turbulence bar installation holes are formed in the side face of the combustion chamber 1, in the embodiment, the cross section of the combustion chamber 1 is rectangular, and the two turbulence bar installation holes are formed in the vertical center line of one side face; the combustion chamber is a combustion chamber commonly used in the prior art and is not described in detail herein;
the rectifying assembly 4, as shown in fig. 6, includes a porous rectifying plate 43, the porous rectifying plate 43 includes a rectifying plate main body 431, the rectifying plate main body 431 is provided with through and evenly distributed rectifying through holes 432 along the thickness direction, the rectifying through holes 432 are combined with the combustion chamber 1 to generate a plane flame, so as to study the influence of sound waves on the plane flame; rectification subassembly 4 still establishes including the cover the fairing 41 in the porous cowling 43 outside, fairing 41 is close to the cooperation of one side of combustion chamber 1 is connected the fairing board 42, be provided with the rectification gasket 44 between porous cowling 43 and the rectification apron 42, between porous cowling 43 and the fairing 41, fairing board 42 and rectification gasket 44 mainly play the spacing fixed and guard action to porous cowling 43.
The turbulent rod assemblies can be installed in one or more turbulent rod installation holes according to the requirements, and are combined with the combustion chamber 1 to generate shear layer flame, so that the influence of sound waves on the shear layer flame is researched;
as shown in fig. 7, the multifunctional test platform of the present invention may further include a burner installed in the combustion chamber 1, wherein the burner is combined with the combustion chamber 1 to generate a jet flame, and the porous rectifying plate 43 or the spoiler assembly is replaced when the interaction between the sound wave and the jet flame is studied, so as to study the influence of the sound wave on the jet flame;
one end of the burner is provided with a spray hole 10 for ejecting flame, and the other end is provided with a connector 11 for fixing the burner.
In order to generate different types of flames, the multi-hole rectifying plate, the turbulence rod assembly and the burner are increased, decreased, replaced and combined to generate plane flames, shear layer flames and jet flames, and different sound wave disturbances applied by the loudspeaker arranged at the bottom are combined, so that the research of interaction of sound waves and flames is carried out aiming at the plane flames, the shear layer flames, the jet flames and the like, and the requirements of carrying out different researches on the same test platform are met; simple structure, easy dismounting, low cost.
In this embodiment, first vortex stick mounting hole and second vortex stick mounting hole have been seted up on the side of combustion chamber 1, and first vortex stick mounting hole and second vortex stick mounting hole can be in the same side of combustion chamber, also can be in different sides, install vortex stick subassembly in first vortex stick mounting hole and the second vortex stick mounting hole respectively.
In this embodiment, the spoiler assembly includes a first spoiler assembly 2 and a second spoiler assembly 3, the first spoiler assembly 2 is installed in the first spoiler mounting hole, and the second spoiler assembly 3 is installed in the second spoiler mounting hole; more specifically, as shown in fig. 2, the first spoiler assembly 2 includes a first spoiler bar 21 disposed in the combustion chamber 1, one end of the first spoiler bar 21 is fixedly connected to a first stud 22, the first stud 22 is in threaded connection with the first spoiler bar mounting hole, and the end of the first spoiler bar is sleeved with a nut 8 for limiting; as shown in fig. 3, the second spoiler assembly 3 includes a second spoiler bar 31 disposed in the combustion chamber 1, one end of the second spoiler bar 31 is fixedly connected to a second stud 32, the second stud 32 is in threaded connection with the second spoiler bar mounting hole, and the end of the second spoiler bar is sleeved with a nut 8 for limiting; in this embodiment, first vortex stick 21 cross-section is circular, second vortex stick 31 cross-section is triangle-shaped, also can adjust the cross sectional shape and the position of each vortex stick as required, adjusts nimble convenience.
Preferably, the transition section 5 comprises a round-square section and a horn section which are fixedly connected with each other, wherein,
the round-to-square section comprises a round-to-square section top plate 51 with the top surface abutting against the rectifying component 4, as shown in fig. 8, the edge of the round-to-square section top plate 51 is fixedly connected with the combustion chamber 1, a square opening 53 is formed in the middle of the round-to-square section top plate 51 and extends towards one side of the loudspeaker to form a round opening 54, the round opening 54 is located in the middle of a round-to-square section bottom plate 52, the edge of the round-to-square section bottom plate 52 is fixedly connected with the horn section through a bolt component, and the rectifying component 4 with a square interface is fixedly connected with the horn section with a round interface through the round-to-;
the loudspeaker section, as shown in fig. 9, support including the top surface and lean on and pass through bolt assembly fixed connection the loudspeaker section roof 55 of circle square segment bottom plate 52, the middle part of loudspeaker section roof 55 open have with the round hole of circle mouth 54 butt joint and to loudspeaker one side extends and forms horn mouth 56, install the bottom of horn mouth 56 the speaker, the speaker is the speaker of using always among the prior art, does not do here and describe repeatedly and the drawing.
The specific using process of the multifunctional test platform for the interaction research of the sound waves and the flames is as follows: firstly, a loudspeaker is fixedly installed at the bottom of the horn mouth 56, then air is supplied to the interior of the test platform, flame is ignited, then the loudspeaker is opened, and research is carried out on interaction of sound waves and flame under different frequencies and sound pressures.
In the research process, when the interaction between sound waves and plane flame needs to be researched, the porous rectifying plate 43 is fixedly arranged between the rectifying sleeve 41 and the rectifying cover plate 42, and the spoiler bar assembly and the burner are not arranged;
when the interaction between the sound wave and the shear layer flame needs to be researched, the porous rectifying plate 43 is removed, the first turbulence bar component 2 and the second turbulence bar component 3 are respectively arranged in the two turbulence bar mounting holes on the side surface of the combustion chamber 1, and the combustor is not arranged;
when the interaction of the sound waves and the jet flame needs to be studied, the first turbulence bar assembly 2, the second turbulence bar assembly 3 and the porous rectifying plate 43 are removed, and the burner is installed in the combustion chamber.
The process of acoustic wave interaction with the jet flame is shown in fig. 10. It can be found that when sound waves act on jet flame, flame can generate phenomena such as fracture, and the platform can be used for researching the interaction of the sound waves and the jet flame.
The variation of the flat flame under different sonic conditions is illustrated in fig. 11-12. It can be seen that the configuration of the flat flame has changed significantly. The platform is proved to realize the interaction of the sound wave and the plane flame.
Through the experimental work, the multifunctional test platform can realize the research on the interaction of sound waves and flames of different types. In addition, the multifunctional test platform provided by the invention can be used for researching the interaction between sound waves and flame, can also be used for researching combustion theory, optical combustion diagnosis and the like, and has a wide application range.
Example two
The multifunctional test platform for the interaction research of sound waves and flames, as shown in fig. 1 to 9, also comprises a support 7, a support plate 9, a transition section 5, a rectifying component 4, a loudspeaker, a combustion chamber 1, a spoiler rod component and a burner, and is different from the first embodiment in that the rectifying component 4, the spoiler rod component and the burner are combined in pairs or three are simultaneously installed in the multifunctional test platform according to needs, so that the influence of the sound waves on the interaction of flames of various types at the same time is realized, different test results are obtained, and the using process is similar to that of the first embodiment.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A multi-functional test platform for sound wave and flame interaction research, includes support (7) and fixed mounting in backup pad (9) at support (7) top, its characterized in that still includes:
the transition section (5) is fixedly arranged in the middle of the supporting plate (9) and is used for transitionally connecting the loudspeaker with the rectifying component (4);
the combustion chamber (1) is fixedly arranged at the top of the rectifying assembly (4), and the side surface of the combustion chamber is provided with at least two turbulence bar mounting holes;
a fairing assembly (4) comprising a porous fairing (43), the porous fairing (43) incorporating the combustion chamber (1) for generating a planar flame;
the turbulence bar assembly is installed in the turbulence bar installation hole and combined with the combustion chamber (1) to generate shear layer flame.
2. The multifunctional test platform for sound wave and flame interaction research of claim 1, characterized in that the test platform further comprises a burner installed in the combustion chamber (1), the burner is combined with the combustion chamber (1) to generate jet flame, and the porous fairing (43) or the spoiler bar assembly is replaced when sound wave and jet flame interaction research is carried out;
one end of the burner is provided with a spray hole (10) for spraying flame, and the other end is provided with a connector (11) for fixing the burner.
3. The multifunctional test platform for the interaction research of sound waves and flames according to claim 2, wherein the side face of the combustion chamber (1) is at least provided with a first turbulence bar mounting hole and a second turbulence bar mounting hole, and turbulence bar assemblies are respectively mounted in the first turbulence bar mounting hole and the second turbulence bar mounting hole.
4. A multifunctional test platform for acoustic wave and flame interaction studies according to claim 3, characterized in that: the turbulence bar assembly at least comprises a first turbulence bar assembly (2) and a second turbulence bar assembly (3), the first turbulence bar assembly (2) is installed in the first turbulence bar mounting hole, and the second turbulence bar assembly (3) is installed in the second turbulence bar mounting hole.
5. The multifunctional test platform for the interaction study of sound waves and flames according to claim 4, wherein: first vortex stick subassembly (2) place in including first vortex stick (21) in combustion chamber (1), first vortex stick (21) one end fixed connection first double-screw bolt (22), first double-screw bolt (22) with first vortex stick mounting hole threaded connection and tip cup joint and are used for spacing nut (8).
6. The multifunctional test platform for the interaction between sound waves and flame as claimed in claim 5, wherein: second vortex stick subassembly (3) place in including second vortex stick (31) in combustion chamber (1), second vortex stick (31) one end fixed connection second double-screw bolt (32), second double-screw bolt (32) with second vortex stick mounting hole threaded connection and tip cup joint and are used for spacing nut (8).
7. A multifunctional test platform for acoustic wave and flame interaction studies according to claim 1, characterized in that: rectification subassembly (4) still establish including the cover rectification cover (41) in porous cowling (43) outside, rectification cover (41) are close to one side cooperation connection rectification apron (42) of combustion chamber (1), be provided with between porous cowling (43) and rectification apron (42), between porous cowling (43) and rectification cover (41) rectification gasket (44).
8. The multifunctional test platform for the interaction of sound waves and flames research of claim 7, wherein: porous cowling panel (43) include cowling panel main part (431), cowling panel main part (431) are seted up along thickness direction and are run through and evenly arranged's rectification through-hole (432).
9. A multifunctional test platform for acoustic wave and flame interaction studies according to claim 1, characterized in that: the transition section (5) comprises a round-square section and a horn section which are fixedly connected with each other,
the round-square-segment comprises a round-square-segment top plate (51) with the top surface abutting against the rectifying assembly (4), the edge of the round-square-segment top plate (51) is fixedly connected with the combustion chamber (1), a square opening (53) is formed in the middle of the round-square-segment top plate (51), the round opening extends towards one side of the loudspeaker to form a round opening (54), the round opening (54) is located in the middle of the round-square-segment bottom plate (52), and the edge of the round-square-segment bottom plate (52) is fixedly connected with the horn segment;
the loudspeaker section leans on and fixed connection including the top surface loudspeaker section roof (55) of circle square section bottom plate (52), the middle part of loudspeaker section roof (55) open have with the round hole of round mouth (54) butt joint and to loudspeaker one side extends and forms horn mouth (56), install horn mouth (56) bottom the speaker.
10. The multifunctional test platform for the interaction between sound waves and flame as claimed in claim 6, wherein: the cross section of the first turbulence bar (21) is circular, and the cross section of the second turbulence bar (31) is triangular.
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