CN109058989B - Visual experiment system for instantaneous reaction of turbulent flame and wall surface - Google Patents
Visual experiment system for instantaneous reaction of turbulent flame and wall surface Download PDFInfo
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- CN109058989B CN109058989B CN201810945161.6A CN201810945161A CN109058989B CN 109058989 B CN109058989 B CN 109058989B CN 201810945161 A CN201810945161 A CN 201810945161A CN 109058989 B CN109058989 B CN 109058989B
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- wall surface
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/38—Torches, e.g. for brazing or heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M11/00—Safety arrangements
- F23M11/04—Means for supervising combustion, e.g. windows
- F23M11/045—Means for supervising combustion, e.g. windows by observing the flame
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The present disclosure provides a visual experiment system for instantaneous reaction of turbulent flame with wall surface, comprising: the device comprises a jet flame generating device, a wall collision surface, a radial opening and closing assembly, a platform bracket and a central control machine; the jet flame generating device is used for generating jet flame; the collision wall surface is arranged on an extension line of the jet flame spraying direction of the jet flame generating device, and jet flame generated by the jet flame generating device can be sprayed to the collision wall surface; the radial opening and closing assembly is arranged between the jet flame generating device and the collision wall surface, and turbulent flame is formed by opening and closing the radial opening and closing assembly when jet flame generated by the jet flame generating device passes through the radial opening and closing assembly; the platform bracket is connected with the radial opening and closing assembly; the central control computer is used for controlling the opening and closing speed and direction of the radial opening and closing assembly and obtaining experimental data of instantaneous reaction of turbulent flame and the wall surface. The measurement result of the method is reliable, and experimental data can provide important references for improving the combustion performance and structural design of the modern combustion power device.
Description
Technical Field
The disclosure relates to the technical field of combustion, in particular to a visual experiment system for instantaneous reaction of turbulent flame and a wall surface.
Background
In the design and testing of contemporary combustion devices, flame interaction with the wall is a major consideration due to burner size limitations. Firstly, when the flame reaches the vicinity of the wall surface, quenching phenomenon is generated, heat loss is generated in the vicinity of the wall surface, thermal stress is formed on the wall surface, and meanwhile, the characteristics of quenching distance and the like of the flame are directly influenced by different thermodynamic conditions of the wall surface; secondly, incomplete combustion is caused due to heat loss near the wall surface, so that the emission of pollutants such as carbon monoxide, hydrocarbon, soot and the like is increased; finally, in practical combustion devices, most of the combustion flame is a multi-scale turbulent flame, and the existence of the wall surface can influence the distribution of the turbulent flow field, the interaction of the turbulent flow and chemical reaction in the combustion process, and the like. Therefore, a deep understanding of the mechanism of flame interaction with the wall may provide the necessary theoretical support for combustion for optimal design of the combustion device.
However, in the combustion process of the actual burner, due to the high-speed transient characteristic (time scale of 5 ms or less) of the reaction between the flame and the wall surface, it is difficult for a general experimental means to effectively measure the reaction process at the transient time, so that a correct result cannot be obtained, and therefore, the reaction model proposed in the numerical simulation process cannot be verified. Another problem is that the turbulence field in the near-wall area evolves from large-scale flow to small-scale vortex with complex motion, and the existing measuring device can seldom accurately measure and analyze the turbulence field, and the small-scale vortex has direct influence on the combustion chemical reaction rate near the wall surface, so that the quantitative measurement of the interaction process of turbulence-chemical reaction in the near-wall area is still a challenging work. In addition, in the piston type combustion power device, a layer of lubricating oil film and a fuel oil film formed by collision of fuel oil injection are often attached to wall surfaces of a cylinder sleeve, a piston head and the like to form a wet wall surface, and the existence of the oil film tends to have certain influence on the concentration of mixed gas, the chemical reaction rate, the heat transfer of the wall surface and the like in a near-wall area.
At present, because the instantaneous reaction process of turbulent flame and wall surface in the actual combustion device is very complex, the difficulty of direct visual measurement is high, and therefore, it is necessary to design a set of simple and effective measuring platform.
Disclosure of Invention
First, the technical problem to be solved
The present disclosure provides a visual experimental system of turbulent flame transient reaction with a wall surface to at least partially solve the technical problems set forth above.
(II) technical scheme
According to one aspect of the present disclosure, there is provided a visual experimental system of a turbulent flame transient reaction with a wall surface, comprising: jet flame generating means for generating a jet flame; the collision wall surface is arranged on an extension line of the jet flame spraying direction of the jet flame generating device, and jet flame generated by the jet flame generating device can be sprayed to the collision wall surface; the radial opening and closing assembly is arranged between the jet flame generating device and the collision wall surface, and turbulent flame is formed by opening and closing the radial opening and closing assembly when jet flame generated by the jet flame generating device passes through the radial opening and closing assembly; the platform bracket is connected with the radial opening and closing assembly; and the central control machine is used for controlling the opening and closing speed and direction of the radial opening and closing assembly and obtaining experimental data of instantaneous reaction of turbulent flame and the wall surface.
In some embodiments of the present disclosure, a radial opening and closing assembly includes: the fixed disc is of a hollow structure and is provided with an opening; the fixed disc is provided with a directional groove; the rotating disc is arranged in the fixed disc and is coaxially connected with the fixed disc; the rotating disc is provided with a groove; the connecting gear is arranged at the opening of the fixed disc and is connected with the rotating disc; the motor gear is connected with the connecting gear; the central control machine controls the rotating speed and the steering of the motor so as to drive the motor gear to rotate; the first surface of the rotating blade is provided with a first fixing pin which is arranged in a groove of the rotating disc; the second surface of the rotating blade is provided with a second fixing pin which is arranged in the orientation groove of the fixing disc.
In some embodiments of the present disclosure, a jet flame generating device includes: a fuel gas cylinder; an air storage tank; the mixing cavity, the fuel gas storage bottle and the air storage tank are respectively connected with the mixing cavity through a gas inlet pipeline, and fuel premixing is carried out in the mixing cavity; a stop valve is arranged on the air inlet pipeline; an air outlet valve is arranged at the outlet of the mixing cavity; the mixed gas transmission pipe is connected with the outlet of the mixing cavity through a connecting pipeline at one end; a flame outlet end cap, the other end of the gas mixture propagation pipe being connected to the flame outlet end cap; an igniter mounted on the flame outlet end cap.
In some embodiments of the present disclosure, further comprising: the instantaneous temperature sensor is arranged on the surface of the collision wall surface and/or embedded in the collision wall surface, and acquires a temperature change signal of the wall surface; the temperature signal amplifier is used for transmitting the temperature change signal acquired by the instantaneous temperature sensor to the central control computer; the flow velocity measuring sensor is used for collecting flow velocity signals of the mixed gas; the flow velocity signal amplifier is used for transmitting the flow velocity signal acquired by the flow velocity measuring sensor to the central control computer; the central control computer controls the laser emitter to be opened and closed to form a laser sheet light source; and the camera device is used for recording the experimental process of the instantaneous reaction of the turbulent flame and the wall surface.
In some embodiments of the present disclosure, the number of the rotor blades is 8, the number of the orientation slots provided on the fixed disk is 8, and the grooves provided on the rotor disk are octagonal grooves.
In some embodiments of the present disclosure, the strike wall is secured to the platform bracket by a link, the strike wall being hingedly connected to the link.
In some embodiments of the present disclosure, the inside of the collision wall is a cavity structure, and a circulating cooling device is disposed in the inner cavity of the collision wall.
In some embodiments of the present disclosure, the jet flame generating device further comprises: the flow control device is arranged on an air inlet pipeline connected with the mixing cavity of the fuel gas storage bottle and/or an air inlet pipeline connected with the mixing cavity of the air storage tank; the air dehumidifier is arranged on an air inlet pipeline connected with the air storage tank and the mixing cavity.
In some embodiments of the present disclosure, the jet flame generating device further comprises: and the honeycomb guide plate is arranged in the mixing cavity.
In some embodiments of the present disclosure, the gas-mixture propagation pipe further includes: the connecting sleeve is sleeved on the gas mixture transmission pipe and is connected with the platform bracket through a fixing rod; the orifice plate sleeve is sleeved on the mixed gas propagation pipe to regulate the flame jet speed and prevent the flame from flowing back.
(III) beneficial effects
From the technical scheme, the visual experimental system for the instantaneous reaction of the turbulent flame and the wall surface has at least one or a part of the following beneficial effects:
(1) The radial opening and closing blade assembly can be opened and closed rapidly in an adjustable range so as to generate instant wall-striking flame.
(2) The visual equipment such as a camera and a laser emitter can measure the reaction process of flame, a wall surface and an oil film in a small time scale and comprehensively analyze the speed, the temperature, the concentration distribution rule and the like of the area close to the wall surface.
(3) The method is simple and convenient to operate, the measurement result is reliable, and the obtained experimental data can provide important reference for improving the combustion performance and structural design of the modern combustion power device.
Drawings
FIG. 1 is a schematic diagram of a visual experiment system for instantaneous reaction of turbulent flame with a wall surface according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural view of the radial opening and closing assembly in fig. 1.
FIG. 3a is a schematic view of the radial opening and closing assembly of FIG. 2 with the rotor blade closed.
FIG. 3b is a schematic view of the radial opening and closing assembly of FIG. 2 in an opened state.
FIG. 3c is a schematic view of the radial opening and closing assembly of FIG. 2 in an opened state.
[ in the drawings, the main reference numerals of the embodiments of the present disclosure ]
1-a flame outlet end cap; 2-a flow rate measurement sensor;
3-orifice plate sleeve; 4-a fixed rod;
5-connecting an end cap; 6-a mixed gas propagation pipe;
7-connecting the sleeve; 8-connecting pipelines;
9-an air outlet valve; 10-a pressure gauge;
11-a platform support; 12-a honeycomb baffle;
13-a mixing chamber; 14, 34-flow control means;
15 32-shut-off valve; 16-a fuel gas cylinder;
17 24-control panel; 18-a laser emitter;
19-synchronizer; 20-wall collision;
21-an instantaneous temperature sensor; 22-a temperature signal amplifier;
23-a central control machine; 25-an air compressor;
26-an image pickup device; 27-motor gear;
29-an electric motor; 30-a flow rate signal amplifier;
31-an air storage tank; 33-an air dehumidifier;
35-radial opening and closing assembly; 36-transient turbulent flame;
37-rotating a disc; 38-fixing the disc;
39-igniter; 40-orientation groove;
41-connecting gears; 42-turning the blades;
43-groove.
Detailed Description
The present disclosure provides a visual experiment system for instantaneous reaction of turbulent flame with wall surface, comprising: the device comprises a jet flame generating device, a wall collision surface, a radial opening and closing assembly, a platform bracket and a central control machine; the jet flame generating device is used for generating jet flame; the collision wall surface is arranged on an extension line of the jet flame spraying direction of the jet flame generating device, and jet flame generated by the jet flame generating device can be sprayed to the collision wall surface; the radial opening and closing assembly is arranged between the jet flame generating device and the collision wall surface, and turbulent flame is formed by opening and closing the radial opening and closing assembly when jet flame generated by the jet flame generating device passes through the radial opening and closing assembly; the platform bracket is connected with the radial opening and closing assembly; the central control computer is used for controlling the opening and closing speed and direction of the radial opening and closing assembly and obtaining experimental data of instantaneous reaction of turbulent flame and the wall surface. The method is simple and convenient to operate, the measurement result is reliable, and the obtained experimental data can provide important reference for improving the combustion performance and structural design of the modern combustion power device.
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.
Certain embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments are shown. Indeed, various embodiments of the disclosure 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 satisfy applicable legal requirements.
In a first exemplary embodiment of the present disclosure, a visual experiment system for instantaneous reaction of turbulent flame with a wall is provided. FIG. 1 is a schematic diagram of a visual experiment system for instantaneous reaction of turbulent flame with a wall surface according to an embodiment of the present disclosure. Fig. 2 is a schematic structural view of the radial opening and closing assembly in fig. 1. As shown in fig. 1-2, a visual experimental system for instantaneous reaction of a turbulent flame with a wall surface of the present disclosure, comprising: the device comprises a jet flame generating device, a collision wall surface 20, a radial opening and closing assembly 35, a platform bracket 11 and a central control computer; the jet flame generating device is used for generating jet flame; the impingement wall 20 is disposed on an extension line of the jet flame injection direction of the jet flame generating device, and the jet flame generated by the jet flame generating device can be injected to the impingement wall 20; the radial opening and closing assembly 35 is arranged between the jet flame generating device and the collision wall surface 20, and when the jet flame generated by the jet flame generating device passes through the radial opening and closing assembly 35, turbulent flame is formed through opening and closing of the radial opening and closing assembly 35; the platform bracket 11 is connected with the radial opening and closing component 35; the central control computer is used for controlling the opening and closing speed and direction of the radial opening and closing component 35 and acquiring experimental data of instantaneous reaction of turbulent flame and the wall surface.
Further comprises: an instantaneous temperature sensor 21, a temperature signal amplifier 22, a flow rate measurement sensor 2, a flow rate signal amplifier 30, a laser emitter 18, and an image pickup device 26; the instantaneous temperature sensor 21 is arranged on the surface of the collision wall surface 20 and/or embedded in the collision wall surface 20, and collects temperature change signals of the wall surface; the temperature change signal acquired by the instantaneous temperature sensor 21 is transmitted to the central control computer 23 through the temperature signal amplifier 22; the flow velocity measuring sensor 2 is arranged on the mixed gas transmission pipe and is used for collecting flow velocity signals of the mixed gas; the flow rate signal amplifier 30 transmits the flow rate signal acquired by the flow rate measuring sensor 2 to the central control computer 23; the central control computer 23 controls the laser emitter 18 to be opened and closed to form a laser sheet light source; the camera device 26 is used for recording the experimental process of the instantaneous reaction of the turbulent flame with the wall surface.
Specifically, the striking wall 20 is fixed to the platform bracket 11 by a link, and the striking wall 20 is hinged to the link.
Specifically, the inside of the collision wall 20 is a cavity structure, and a circulation cooling device is arranged in the inner cavity of the collision wall 20.
Wherein, radial opening and closing assembly 35 includes: a fixed disk 38, a rotating disk 37, a connecting gear 41, a motor gear 27, and a rotating blade 42; the fixed disk 38 is of a hollow structure, the fixed disk 38 is provided with an opening, and the fixed disk 38 is provided with a directional groove 40; the rotating disc 37 is arranged in the fixed disc 38 and is coaxially connected with the fixed disc 38, and a groove is formed in the rotating disc 37; the connecting gear 41 is arranged at the opening of the fixed disk 38 and is connected with the rotating disk 37; the motor gear 27 is connected with the connecting gear 41; the central control computer controls the rotation speed and the rotation direction of the motor 29 so as to drive the motor gear 27 to rotate; the first surface of the rotor blade 42 is provided with a first fixing pin, and the first fixing pin is arranged in the groove of the rotor disc 37; a second fixed pin is provided on a second surface of the rotor blade 42 and is disposed in the orientation groove 40 of the fixed disk 38. FIG. 3a is a schematic view of the radial opening and closing assembly of FIG. 2 with the rotor blade closed. FIG. 3b is a schematic view of the radial opening and closing assembly of FIG. 2 in an opened state. FIG. 3c is a schematic view of the radial opening and closing assembly of FIG. 2 in an opened state. Fig. 3a to 3c are views showing a state in which the blades are gradually opened, and fig. 3c is a schematic view showing a state in which the rotor blades 42 are fully opened.
Specifically, the number of the rotor blades 42 is 8, the number of the orientation grooves provided on the fixed disk is 8, and the grooves provided on the rotor disk 37 are octagonal grooves.
Wherein, jet flame generating device includes: a fuel gas cylinder 16, an air reservoir 31, a mixing chamber 13, a mixture propagation tube 6, a flame outlet end cap 1 and an igniter 39; the fuel gas storage bottle 16 and the air storage tank 31 are respectively connected with the mixing cavity 13 through a gas inlet pipeline, and fuel premixing is carried out in the mixing cavity 13; the air inlet pipeline is provided with a stop valve 15 and a stop valve 32; an air outlet valve 9 is arranged at the outlet of the mixing cavity 13; one end of the mixed gas propagation pipe 6 is connected with the outlet of the mixing cavity 13 through a connecting pipeline 8; the other end of the mixed gas propagation pipe 6 is connected with the flame outlet end cap 1; the igniter is mounted on the flame outlet end cap 1.
Further, the method further comprises the following steps: a flow control device 14, a flow control device 34, an air dehumidifier 33, a honeycomb baffle 12, a connection sleeve 7 and an orifice sleeve 3; the flow control device is arranged on an air inlet pipeline of the fuel gas storage bottle 16 connected with the mixing cavity 13 and/or an air inlet pipeline of the air storage tank 31 connected with the mixing cavity 13; the air dehumidifier 33 is arranged on an air inlet pipeline of the air storage tank 31 connected with the mixing cavity 13; a honeycomb baffle 12 is disposed within the mixing chamber 13. The connecting sleeve 7 is sleeved on the gas mixture transmission pipe 6, and the connecting sleeve 7 is connected with the platform bracket 11 through the fixing rod 4; the orifice plate sleeve 3 is sleeved on the mixed gas propagation pipe 6 to adjust the flame jet speed and place the flame backflow.
The air outlet valve 9 of the mixing cavity 13 is closed in the initial state, and the air and fuel are mixed according to a certain proportion by opening the fuel stop valve 15 and the air stop valve 32 and adjusting the flow control device 14 and the flow control device 34, so that the change of the flame wall collision process can be studied by adjusting different equivalence ratios. Wherein air is first compressed by the compressor 25 and stored in the air storage tank 31, and then dried by the air dehumidifier 33 before being mixed with fuel. The honeycomb baffle 12 can increase the uniformity of the mixture. After the pressure gauge 10 reaches a specified value, closing to stop air intake. After the pressure in the mixing cavity 13 is stable, the air outlet valve 9 is opened, so that the premixed air enters the mixed gas propagation pipe 6 through the connecting pipeline 8 and the connecting end cap 5 under the action of pressure, and the mixed gas propagation pipe 6 is vertically fixed through the fixing rod 4 and the connecting sleeve 7. At the upper end of the gas mixture propagation pipe 6, the gas mixture flows through an orifice plate sleeve 3 (steel sheets can not be installed under the low-speed jet condition) which can be provided with different perforated steel sheets according to requirements so as to adjust the flame jet speed and further prevent flame from flowing back, and the orifice plate sleeve 3 is connected with the upper section and the lower section of gas mixture propagation pipe 6 through internal threads, and the perforated steel sheets are pressed and fixed after being connected. An igniter 39 is mounted on the flame outlet end cap 1 for controlling ignition by the control panel 24 to generate a premixed jet flame. When the flame is generated, the rotating blades 42 of the radial opening and closing assembly 35 are in a closed state, after the flow rate measuring sensor 2 measures that the flow rate of the mixed gas is within a stable preset range, the control panel 24 can control the motor 29 to rotate forward by a certain angle according to a certain rotating speed, the rotating blades 42 of the opening and closing assembly 35 rapidly open an outlet through gear transmission, and then rotate reversely to close the outlet, and in the process, jet flame can pass through the outlet surrounded by the rotating blades 42 and form intermittent instant turbulent flame to strike the wall surface. The wall surface component is hinged with a connecting rod fixed on the test platform bracket 11, and the collision wall surface 20 can be different in angle with the horizontal plane around the hinge of the left end, so that the change of the angle of flame collision wall surface is realized. The wall collision surface 20 is internally provided with a cavity, and cooling water circularly flows inside and outside the cavity to keep the fixed wall collision surface 20 temperature. The instantaneous temperature sensors 21 are respectively arranged on the surface of the wall collision surface 20 and/or embedded in the wall collision surface 20 at a certain depth, so that the instantaneous wall temperature change can be measured, a temperature signal is transmitted to the central control computer 23 through the temperature signal amplifier 22, and the heat transfer of the wall surface in the flame wall collision process can be quantitatively calculated. While the rotating blades 42 of the radial opening and closing assembly 35 are opened, the control panel 17 controls the laser transmitter 18 through the synchronizer 19 to form a laser sheet light source, and the imaging device 26 can be used for continuously recording the appearance change of quenching of the flame near the wall surface, the instantaneous turbulence field speed distribution of the near-wall surface area, the concentration distribution of partial products and the like. Therefore, the instantaneous reaction between the turbulent premixed flame and the wall (or the wall oil film) can be intuitively and accurately measured and analyzed.
Thus, embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. It should be noted that, in the drawings or the text of the specification, implementations not shown or described are all forms known to those of ordinary skill in the art, and not described in detail. Furthermore, the above definitions of the elements and methods are not limited to the specific structures, shapes or modes mentioned in the embodiments, and may be simply modified or replaced by those of ordinary skill in the art.
From the above description, one skilled in the art should have clear insight into the visual experimental system of the instant reaction of turbulent flames with walls of the present disclosure.
In summary, the method is simple and convenient to operate, the measurement result is reliable, and the obtained experimental data can provide important references for improving the combustion performance and structural design of the modern combustion power device.
It should be further noted that, the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings, and are not intended to limit the scope of the present disclosure. Like elements are denoted by like or similar reference numerals throughout the drawings. Conventional structures or constructions will be omitted when they may cause confusion in understanding the present disclosure.
And the shapes and dimensions of the various elements in the drawings do not reflect actual sizes and proportions, but merely illustrate the contents of the embodiments of the present disclosure. In addition, in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
Unless otherwise known, numerical parameters in this specification and the appended claims are approximations that may vary depending upon the desired properties sought to be obtained by the present disclosure. In particular, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term "about". In general, the meaning of expression is meant to include a variation of + -10% in some embodiments, a variation of + -5% in some embodiments, a variation of + -1% in some embodiments, and a variation of + -0.5% in some embodiments by a particular amount.
Furthermore, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.
The use of ordinal numbers such as "first," "second," "third," etc., in the description and the claims to modify a corresponding element does not by itself connote any ordinal number of elements or the order of manufacturing or use of the ordinal numbers in a particular claim, merely for enabling an element having a particular name to be clearly distinguished from another element having the same name.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the disclosure, various features of the disclosure are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various disclosed aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this disclosure.
While the foregoing embodiments have been described in some detail for purposes of clarity of understanding, it will be understood that the foregoing embodiments are merely illustrative of the invention and are not intended to limit the invention, and that any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (9)
1. A visual experimental system for instantaneous reaction of turbulent flame with a wall surface, comprising:
jet flame generating means for generating a jet flame;
the collision wall surface is arranged on an extension line of the jet flame spraying direction of the jet flame generating device, and jet flame generated by the jet flame generating device can be sprayed to the collision wall surface;
the radial opening and closing assembly is arranged between the jet flame generating device and the collision wall surface, and turbulent flame is formed through opening and closing of the radial opening and closing assembly when jet flame generated by the jet flame generating device passes through the radial opening and closing assembly;
the platform bracket is connected with the radial opening and closing assembly;
the central control machine is used for controlling the opening and closing speed and direction of the radial opening and closing assembly and acquiring experimental data of instantaneous reaction of turbulent flame and the wall surface;
the instantaneous temperature sensor is arranged on the surface of the collision wall surface and/or embedded in the collision wall surface, and collects temperature change signals of the wall surface;
the central control computer controls the laser transmitter to be opened and closed to form a laser sheet light source;
the camera device is used for recording the experimental process of the instantaneous reaction of the turbulent flame and the wall surface;
wherein, radial opening and closing assembly includes:
the fixed disc is of a hollow structure and is provided with an opening; the fixed disc is provided with a directional groove;
the rotating disc is arranged in the fixed disc and is coaxially connected with the fixed disc; the rotating disc is provided with a groove;
the connecting gear is arranged at the opening of the fixed disc and is connected with the rotating disc;
the motor gear is connected with the connecting gear; the central control machine controls the rotating speed and the steering of the motor so as to drive the motor gear to rotate;
the first surface of the rotating blade is provided with a first fixing pin which is arranged in a groove of the rotating disc; the second surface of the rotating blade is provided with a second fixing pin, and the second fixing pin is arranged in the orientation groove of the fixing disc.
2. The visualization experiment system of claim 1, wherein the jet flame generating device comprises:
a fuel gas cylinder;
an air storage tank;
the fuel gas storage bottle and the air storage tank are respectively connected with the mixing cavity through a gas inlet pipeline, and fuel premixing is carried out in the mixing cavity; a stop valve is arranged on the air inlet pipeline; an air outlet valve is arranged at the outlet of the mixing cavity;
the mixed gas transmission pipe is connected with the outlet of the mixing cavity through a connecting pipeline at one end;
the other end of the gas mixture propagation pipe is connected with the flame outlet end cap;
an igniter mounted on the flame outlet end cap.
3. The visualization experiment system of claim 1, further comprising:
a temperature signal amplifier, which is used for transmitting the temperature change signal acquired by the instantaneous temperature sensor to the central control computer;
the flow velocity measuring sensor is used for collecting flow velocity signals of the mixed gas;
and the flow velocity signal amplifier is used for transmitting the flow velocity signal acquired by the flow velocity measuring sensor to the central control computer.
4. The visual inspection system of claim 1, wherein the number of turning vanes is 8, the number of orientation slots provided on the fixed disk is 8, and the grooves provided on the turning disk are octagonal grooves.
5. The visualization experiment system of claim 1, wherein the strike wall is secured to the platform support by a link, the strike wall being hingedly connected to the link.
6. The visual experiment system according to claim 1, wherein the collision wall is of a cavity structure, and a circulating cooling device is arranged in the inner cavity of the collision wall.
7. The visualization experiment system of claim 2, wherein the jet flame generating device further comprises:
the flow control device is arranged on an air inlet pipeline connected with the mixing cavity of the fuel gas storage bottle and/or an air inlet pipeline connected with the mixing cavity of the air storage tank;
the air dehumidifier is arranged on an air inlet pipeline connected with the air storage tank and the mixing cavity.
8. The visualization experiment system of claim 2, wherein the jet flame generating device further comprises:
and the honeycomb guide plate is arranged in the mixing cavity.
9. The visualization experiment system of claim 2, wherein the gas mixture propagation tube further comprises:
the connecting sleeve is sleeved on the gas mixture transmission pipe and is connected with the platform bracket through a fixing rod;
and the orifice plate sleeve is sleeved on the gas mixture propagation pipe to regulate the flame jet speed and prevent the flame from flowing back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810945161.6A CN109058989B (en) | 2018-08-17 | 2018-08-17 | Visual experiment system for instantaneous reaction of turbulent flame and wall surface |
Applications Claiming Priority (1)
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| CN112268977B (en) * | 2020-09-18 | 2022-08-12 | 天津大学 | Realize that burning flame optics of formula that flows heating of admitting air is visual measuring device |
| CN112684099B (en) * | 2020-12-18 | 2022-09-09 | 郑州大学 | Assembled turbulent flame extinguishing device |
| CN113757660B (en) * | 2021-09-29 | 2023-08-29 | 广东美的白色家电技术创新中心有限公司 | Burner and gas stove |
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