Small wind tunnel combustion test platform for forest fire simulation

Abstract

The invention discloses a small wind tunnel combustion test platform for forest fire simulation. The small wind tunnel combustion test platform comprises a combustion cabin and a wind generating cylinder communicated with the combustion cabin, a mounting seat is fixedly arranged in the middle of the upper portion of a bottom plate of the combustion bin, a combustion table is movably arranged above the mounting seat, and a connecting arm hinged to the mounting seat is fixedly arranged at the bottom of the combustion table. The portions, close to the two ends, of the bottom of the combustion table make contact with supporting balls vertically and movably arranged in the combustion bin, and two adjusting mechanisms used for adjusting the heights of the supporting balls located at the two ends of the bottom of the combustion table correspondingly are arranged on a bottom plate of the combustion bin. A plurality of smoke discharging cylinders are uniformly arranged at the upper part of the combustion cabin at intervals; one end of the air generating barrel is communicated with the combustion cabin, an induced draft fan is arranged at the other end of the air generating barrel, and a heating device and a humidifying device are arranged in the air generating barrel. According to the method, the authenticity of forest fire experiment simulation is improved, and the method has important significance for accurately evaluating fire hazards.

Description

Technical Field

[0001] The invention relates to the technical field of forest fire simulation research, in particular to a small wind tunnel combustion test platform for forest fire simulation. Background Art

[0002] Forest fire is a very dangerous fire that is easy to spread, difficult to control and difficult to extinguish, threatening people's lives and property safety. Forest disaster prevention is relatively difficult, and the preliminary work for fire prevention and control requires fire risk assessment. Fire risk assessment work first requires the simulation of the fire combustion environment. However, in the existing technology, because the relevant experimental equipment does not accurately consider the actual terrain and combustion conditions of the sample during the fire simulation process, there is a problem of low authenticity of the fire simulation, which makes it very difficult to assess the fire hazard. Summary of the invention

[0003] The purpose of the present invention is to provide a small wind tunnel combustion test platform for forest fire simulation to solve the technical problems mentioned in the above background technology.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The invention discloses a small wind tunnel combustion test platform for simulating forest fire, comprising a combustion chamber and a wind-making tube connected with the combustion chamber.

[0006] A mounting seat is fixedly provided in the middle of the upper part of the bottom plate of the combustion chamber, a combustion table is movably provided above the mounting seat, and a connecting arm hingedly connected to the mounting seat is fixedly provided at the bottom of the combustion table; parts of the bottom of the combustion table near the two ends are respectively in contact with supporting balls vertically movably arranged inside the combustion chamber, and two groups of adjustment mechanisms are provided on the bottom plate of the combustion chamber for adjusting the height of the supporting balls located at the two ends of the bottom of the combustion table, and a plurality of smoke exhaust pipes are evenly spaced apart on the upper part of the combustion chamber.

[0007] One end of the wind-generating cylinder is connected to the combustion chamber, and the other end is provided with an induced draft fan. A heating device and a humidifying device are provided inside the wind-generating cylinder.

[0008] Furthermore, a plurality of supporting legs are fixedly arranged at even intervals on the bottom of the combustion chamber.

[0009] Furthermore, a door is hingedly provided on the combustion chamber, and a transparent observation window is provided on the door.

[0010] Furthermore, the combustion table includes a main base plate at the bottom and a heat-insulating protective plate arranged above the main base plate, and a plurality of electric igniters are evenly spaced in a rectangular array on the main base plate, and the heat-insulating protective plate has ignition holes at positions corresponding to each of the electric igniters.

[0011] Furthermore, each of the adjusting mechanisms includes a nut fixedly provided on the bottom plate of the combustion chamber and a screw rotatably provided on the nut and threadedly connected to the nut, one end of the screw located inside the combustion chamber is rotatably connected to the middle of the bottom of a horizontally arranged lifting platform, and the support ball is fixedly provided on the upper part of the lifting platform; two vertical limit sliding rods are fixedly provided at both ends of the lifting platform, and each of the limit sliding rods is slidably matched with a through hole opened on the bottom plate of the combustion chamber, and a handwheel is fixedly provided at one end of the screw located outside the combustion chamber.

[0012] Furthermore, an upper connecting seat and a lower connecting seat are fixedly arranged in sequence from top to bottom in the middle of the bottom of the lifting platform, the lower connecting seat is provided with a lower connecting hole that matches the clearance of the screw rod, the upper connecting seat is provided with an upper connecting hole whose inner diameter is larger than that of the lower connecting hole, and the upper end of the screw rod is fixedly provided with a connecting head that matches the clearance of the upper connecting hole.

[0013] Furthermore, a support frame with an E-shaped cross section and arranged along the width direction of the combustion platform is fixedly provided on the upper part of the mounting platform, and support balls are provided on the three free ends of the upper part of the support frame.

[0014] Furthermore, the combustion device is specifically configured as a spiral electric heater, and the electric heater is fixedly disposed inside the wind tube via a plurality of support rings fixedly connected to the inner wall of the wind tube.

[0015] Furthermore, the humidifying device includes a plurality of evenly spaced annular humidifying tubes fixedly arranged on the inner circumferential wall of the wind cylinder, each of the annular humidifying tubes is connected to the water supply pipe outside the wind cylinder, and a plurality of atomizing nozzles connected to the interior thereof are evenly arranged on the inner circumferential direction of each annular humidifying tube.

[0016] Furthermore, a flow stabilizer is provided inside the wind duct near the combustion chamber, and the flow stabilizer includes a plurality of flow stabilizer plates arranged in a criss-cross pattern, and the free end of each of the flow stabilizer plates is fixedly connected to the inner circumferential wall of the wind duct.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] The present invention can simulate the burning conditions of forest fires under terrain scenarios such as downslope wind, upslope wind and different slopes, and conducts quantitative and qualitative research on forest fires and forest fire spread laws based on conditions such as wind speed and airflow temperature, thereby improving the authenticity of forest fire experimental simulations and is of great significance for the accurate assessment of fire hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall external structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal cross-sectional structure of the combustion chamber of the present invention;

[0022] Figure 3 for Figure 2 A schematic diagram of the structure enlargement at the center A;

[0023] Figure 4 It is a schematic diagram of the adjustment mechanism of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal cross-sectional structure of the wind tube of the present invention;

[0025] Figure 6 It is a schematic diagram of the structure of the flow stabilizer of the present invention;

[0026] Explanation of the reference numerals in the accompanying drawings: 1. Combustion chamber; 2. Wind chimney; 3. Support leg; 4. Hatch door; 5. Mounting seat; 6. Combustion table; 7. Connecting arm; 8. Main base plate; 9. Heat insulation protection plate; 10. Electric igniter; 11. Spark hole; 12. Support ball; 13. Nut; 14. Screw; 15. Lifting platform; 16. Upper connecting seat; 17. Lower connecting seat; 18. Connecting head; 19. Limiting slide rod; 20. Hand wheel; 21. Support frame; 22. Smoke exhaust chimney; 23. Draft fan; 24. Electric heater; 25. Support ring; 26. Annular humidifying pipe; 27. Water supply pipe; 28. Atomizing nozzle; 29. ​​Flow stabilizer; 30. Temperature monitor; 31. Humidity monitor; 32. High temperature resistant camera. DETAILED DESCRIPTION

[0027] like Figure 1-Figure 6 As shown, a small wind tunnel combustion test platform for simulating forest fires includes a combustion chamber 1 and a wind generator 2 connected to the combustion chamber 1.

[0028] A plurality of supporting legs 3 are fixedly installed at even intervals on the bottom of the combustion chamber 1, and a door 4 is hingedly installed on the combustion chamber 1. The door can be opened and locked, and a transparent observation window is provided on the door 4 to facilitate observation of the internal situation of the combustion chamber 1.

[0029] A mounting seat 5 is fixedly provided in the middle of the upper part of the bottom plate of the combustion chamber 1, and a combustion platform 6 is movably installed above the mounting seat 5. Specifically, a connecting arm 7 hingedly connected to the mounting seat 5 is fixedly provided in the middle of the bottom of the combustion platform 6. The combustion platform 6 includes a main base plate 8 at the bottom and a heat insulation protection plate 9 arranged above the main base plate 8. A plurality of electric igniters 10 are evenly spaced and installed on the main base plate 8 in a rectangular array. The heat insulation protection plate 9 is provided with ignition holes 11 at positions corresponding to each of the electric igniters 10. Through the above arrangement, it is possible to ignite the material at different positions of the combustion platform.

[0030] The bottom of the combustion table 6 near the two ends are in contact with the support balls 12 vertically movably arranged inside the combustion chamber 1. Two sets of adjustment mechanisms are arranged on the bottom plate of the combustion chamber 1 for adjusting the height of the support balls 12 located at the two ends of the bottom of the combustion table 6.

[0031] Each of the adjustment mechanisms comprises a nut 13 fixedly arranged on the bottom plate of the combustion chamber 1 and a screw 14 rotatably mounted on the nut 13 and threadedly connected to the nut 13. One end of the screw 14 located inside the combustion chamber 1 is rotatably connected to the bottom middle of the horizontally arranged lifting platform 15. Specifically, an upper connecting seat 16 and a lower connecting seat 17 are fixedly arranged in the middle of the bottom of the lifting platform 15 from top to bottom. The lower connecting seat 17 is provided with a lower connecting hole that is clearance-matched with the screw 14. The upper connecting seat 16 is provided with an upper connecting hole whose inner diameter is larger than the lower connecting hole. A connector 18 that is clearance-matched with the upper connecting hole is fixedly arranged on the upper end of the screw 14. Two vertical limit slide bars 19 are fixedly arranged at both ends of the lifting platform 15. Each of the limit slide bars 19 is slidably matched with a through hole opened on the bottom plate of the combustion chamber 1. A hand wheel 20 for driving the screw 14 to rotate is fixedly arranged on one end of the screw 14 located outside the combustion chamber 1.

[0032] The support ball 12 is fixedly arranged on the upper part of the lifting platform 15. In this embodiment, a support frame 21 with an E-shaped cross-section and arranged along the width direction of the combustion table 6 is fixedly arranged on the upper part of the mounting platform 12, and support balls 12 are arranged on the three free ends of the upper part of the support frame 21.

[0033] A plurality of smoke exhaust pipes 22 connected to the interior of the combustion chamber 1 are evenly spaced and installed on the upper portion of the combustion chamber 1 .

[0034] One end of the wind-generating cylinder 2 is connected to the combustion chamber 1 , and an induced draft fan 23 is installed at the other end. A heating device and a humidifying device are arranged inside the wind-generating cylinder 2 .

[0035] The combustion device is specifically configured as a spiral electric heater 24 , and the electric heater 24 is fixedly installed inside the wind tube 2 via a plurality of support rings 25 fixedly connected to the inner wall of the wind tube 2 .

[0036] The humidifying device includes a plurality of evenly spaced annular humidifying pipes 26 fixedly installed on the inner circumferential wall of the wind cylinder 2, each of the annular humidifying pipes 26 is connected to a water supply pipe 27 outside the wind cylinder 2, and a plurality of atomizing nozzles 28 connected to the interior thereof are evenly installed on the inner circumferential wall of each annular humidifying pipe 26 along the circumferential direction.

[0037] In addition, a flow stabilizer 29 is provided inside the wind duct 2 near the combustion chamber 1. The flow stabilizer 29 includes a plurality of flow stabilizers arranged in a crisscross pattern, and the free ends of the flow stabilizers are fixedly connected to the inner circumferential wall of the wind duct. The flow stabilizer 29 can stabilize the vortex wind introduced by the induced draft fan, so that the wind direction enters the combustion chamber stably.

[0038] The present invention also includes a temperature monitor 30 and a humidity monitor 31 installed at one end of the combustion chamber close to the wind chimney, and a high temperature resistant camera 32 installed at the other end of the combustion chamber 1.

[0039] When the present invention is working, firstly, the slope and direction of the combustion platform are adjusted according to the test requirements. When making specific adjustments, it is only necessary to rotate the hand wheels at the lower ends of the two screws respectively so that the lifting platform drives the corresponding supporting balls to move up and down. The slope and direction of the combustion platform can be determined by the height difference of the supporting balls at both ends, and then the sample material for the test is placed on the combustion platform. The fan is started to generate wind. When the external wind introduced passes through the wind generating tube, the airflow blown into the combustion chamber is heated and humidified by the electric heater and the annular humidifying tube. After the temperature and humidity monitored by the temperature monitor and humidity monitor in the combustion chamber meet the test requirements and tend to be stable, the sample material can be ignited by the corresponding electric igniter, and then the simulation test can be carried out.

[0040] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A small wind tunnel combustion test platform for forest fire simulation, characterized by: It includes a combustion chamber and a wind-generating tube connected to the combustion chamber; A mounting seat is fixedly provided in the middle of the upper part of the bottom plate of the combustion chamber, a combustion platform is movably provided above the mounting seat, and a connecting arm hingedly connected to the mounting seat is fixedly provided at the bottom of the combustion platform; the bottom of the combustion platform near the two ends are respectively in contact with supporting balls vertically movably provided inside the combustion chamber, and two groups of adjustment mechanisms for adjusting the height of the supporting balls located at the two ends of the bottom of the combustion platform are provided on the bottom plate of the combustion chamber, and a plurality of smoke exhaust pipes are evenly spaced at the top of the combustion chamber; One end of the wind-generating cylinder is connected to the combustion chamber, and the other end is provided with an induced draft fan. A heating device and a humidifying device are provided inside the wind-generating cylinder.

2. The small wind tunnel combustion test platform for forest fire simulation according to claim 1 is characterized by: A plurality of supporting legs are fixedly arranged at even intervals on the bottom of the combustion chamber.

3. The small wind tunnel combustion test platform for forest fire simulation according to claim 1 is characterized by: A door is hingedly provided on the combustion chamber, and a transparent observation window is provided on the door.

4. The small wind tunnel combustion test platform for forest fire simulation according to claim 1 is characterized by: The combustion table includes a main base plate at the bottom and a heat-insulating protective plate arranged above the main base plate. A plurality of electric igniters are evenly spaced in a rectangular array on the main base plate. The heat-insulating protective plate has ignition holes at positions corresponding to the electric igniters.

5. The small wind tunnel combustion test platform for forest fire simulation according to claim 1 is characterized by: Each of the adjusting mechanisms includes a nut fixedly arranged on the bottom plate of the combustion chamber and a screw rotatably arranged on the nut and threadedly connected to the nut, one end of the screw located inside the combustion chamber is rotatably connected to the middle of the bottom of a horizontally arranged lifting platform, and the support ball is fixedly arranged on the upper part of the lifting platform; two vertical limit sliding rods are fixedly arranged at both ends of the lifting platform, and each of the limit sliding rods is slidably matched with a through hole opened on the bottom plate of the combustion chamber, and a handwheel is fixedly arranged at one end of the screw located outside the combustion chamber.

6. The small wind tunnel combustion test platform for forest fire simulation according to claim 5 is characterized by: An upper connecting seat and a lower connecting seat are fixedly arranged in the middle of the bottom of the lifting platform from top to bottom in sequence, the lower connecting seat is provided with a lower connecting hole that matches the gap of the screw rod, the upper connecting seat is provided with an upper connecting hole with an inner diameter larger than the lower connecting hole, and a connecting head that matches the gap of the upper connecting hole is fixedly arranged on the upper end of the screw rod.

7. The small wind tunnel combustion test platform for forest fire simulation according to claim 5 is characterized by: A support frame with an E-shaped cross section and arranged along the width direction of the combustion platform is fixedly arranged on the upper part of the mounting platform, and support balls are arranged on the three free ends of the upper part of the support frame.

8. The small wind tunnel combustion test platform for forest fire simulation according to claim 1 is characterized by: The combustion device is specifically configured as a spiral electric heater, and the electric heater is fixedly disposed inside the wind tube via a plurality of support rings fixedly connected to the inner wall of the wind tube.

9. The small wind tunnel combustion test platform for forest fire simulation according to claim 1 is characterized by: The humidifying device includes a plurality of evenly spaced annular humidifying tubes fixedly arranged on the inner circumferential wall of the wind cylinder, each of the annular humidifying tubes is connected to the water supply pipe outside the wind cylinder, and a plurality of atomizing nozzles connected to the interior of each annular humidifying tube are evenly arranged along the circumferential direction on the inner circumferential wall of each annular humidifying tube.

10. The small wind tunnel combustion test platform for forest fire simulation according to claim 1, characterized in that: A flow stabilizer is arranged inside the wind duct near the combustion chamber. The flow stabilizer includes a plurality of flow stabilizer plates arranged in a crisscross pattern. The free end of each of the flow stabilizer plates is fixedly connected to the inner circumferential wall of the wind duct.

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