Turbulent flame experimental apparatus

Abstract

The turbulent flame experimental device comprises a gas tank, combined plates arranged in the gas tank for separating the internal space of the gas tank, and baffles for closing the air inlet between two adjacent combined plates, each combined plate is composed of a partition plate and an arc plate which are fixedly connected as a whole, the side of the partition plate away from the arc plate is fixedly connected with the inner wall of the gas tank, the arc plates surround the combustion zone interval of the arc-shaped circular wall, the partition plate and the baffle are slidingly connected, the top and bottom of the gas tank are respectively fixedly provided with a top plate and a bottom plate, a rotating drum is movably connected in the gas tank, the rotating drum is used for blocking or connecting the air inlet and the combustion zone interval, the inside of the top plate is provided with a movable hole which is matched with the rotating drum so that the rotating drum is inserted into the gas tank through the movable hole, the rotating drum is rotatably connected with the bottom plate, the inside of the top plate is provided with a through hole which is matched with the baffle so that the baffle is inserted into the gas tank through the through hole, the top of the bottom plate is provided with a sliding groove which is matched with the baffle, and the bottom plate is provided with air holes around the periphery. The device can be used for turbulent flame test.

Description

Background Technology

[0001] Turbulent flames differ from laminar flames in their waveform and propagation speed. This type of flame is commonly found in urban, grassland, and forest fires. Studying the causes, controlling factors, and available extinguishing agents of flame combustion is of great significance for fire fighting and fire safety. Summary of the Invention

[0002] This invention provides a turbulent flame experimental apparatus, including a gas chamber, a combination plate disposed inside the gas chamber to divide its internal space, and a baffle for sealing the air inlet between two adjacent combination plates. Each combination plate consists of a partition plate and an arc-shaped plate fixedly connected as one unit, with the side of the partition plate facing away from the arc-shaped plate fixedly connected to the inner wall of the gas chamber. The partition plate and the baffle plate are slidably connected. A top plate and a bottom plate are fixedly connected to the top and bottom of the gas chamber, respectively. The combination plate can be fixed inside the gas chamber. A rotating cylinder is also movably connected inside the gas chamber. The top plate has an movable hole adapted to the rotating cylinder so that the rotating cylinder can be inserted into the gas chamber. The rotating cylinder is rotatably connected to the bottom plate. The top plate has a through hole adapted to the baffle so that the baffle can be inserted into the gas chamber. The top of the bottom plate has a sliding groove adapted to the baffle. The bottom plate has ventilation holes around its perimeter, with a total of four ventilation holes, all of which communicate with the interior of the gas chamber. The combined plate can be configured as four, with the four partitions and four arc-shaped plates distributed at equal angles around the central axis of the gas box, dividing the gas box into four gas compartments in a centrally symmetrical manner, and each of the four gas compartments is connected to one of the four vents. The partitions can be rectangular plates, and the arc of the arc-shaped plates can be 0.5π. Preferably, the partitions in the same combined plate are tangent to the arc-shaped plates integral with them; the partitions of two adjacent combined plates can be perpendicular to each other.

[0003] Optionally, the rotating drum is cylindrical in shape, with the upper section of its sidewall being a complete cylinder and the lower section having symmetrically axially symmetrical through grooves for connecting the air inlet and the inner cavity of the rotating drum.

[0004] Optionally, the base plate is provided with an annular groove adapted to the rotating cylinder, and the rotating cylinder is movably connected to the annular groove.

[0005] Optionally, the height of the baffle and the rotating cylinder is greater than that of the air box, preferably greater than the sum of the height of the air box, the thickness of the top plate, and the thickness of the bottom plate. For example, the height of the air box is 0.54m, the height of the baffle and the rotating cylinder is 0.56m, and the thickness of the top plate and the bottom plate is 0.005m.

[0006] Optionally, the total number of baffles is two or four, and the number of through holes and grooves is of course the same as that of the baffles.

[0007] Optionally, the gas box is a sealed cylinder. Attached Figure Description

[0008] Figure 1 This is a perspective view of the turbulent flame experimental apparatus of the present invention; Figure 2 This is an exploded view of the turbulent flame experimental apparatus of the present invention; Figure 3 This is a top view of the internal structure of the gas box of the present invention; Figure 4 This is a perspective view of the rotating cylinder structure of the present invention. Detailed Implementation

[0009] like Figure 1-4 As shown, this embodiment provides an assembled turbulent flame device, which includes a gas box 1 and four combined plates disposed therein. Each combined plate consists of a partition plate 2 and an arc-shaped plate 3. One side of the partition plate 2 is fixedly connected to the arc-shaped plate 3, and the other side is fixedly connected to the inner wall of the gas box 1. The four partition plates 2 and the four arc-shaped plates 3 are distributed at equal angles about the central axis of the gas box 1, dividing the interior of the gas box 1 into four gas compartments in a centrally symmetrical manner. The top and bottom of the gas box 1 are respectively fixedly connected to a top plate 4 and a bottom plate 5. The bottom plate 5 has ventilation holes 11 around its perimeter, and the four ventilation holes 11 are respectively connected to the interior of the four gas compartments. The air chamber 1 is internally connected to a rotating cylinder 6. The top plate 4 has an internally fitted rotating hole 7 that matches the rotating cylinder 6. The top of the bottom plate 5 has an annular groove 12 that matches the rotating cylinder 6. The rotating cylinder 6 can pass through the rotating hole 7 into the air chamber 1 and connect internally to the annular groove 12. The upper end of the rotating cylinder 6 is cylindrical, and through grooves are formed on opposite sides of the rotating cylinder 6 below the cylinder. The junction of the two combined plates is the air inlet. When the experiment is completed, the air inlet can be sealed with a baffle to prevent inert gas or other gaseous extinguishing agents from spreading into the atmosphere. A baffle 8 is inserted between the partition 2 and the opposite arc-shaped plate 3, and the connection is a sliding connection. The top plate 4 has an internally fitted through hole 9 that matches the baffle 8, and the bottom plate 5 has a sliding groove 10 that matches the baffle 8. Two baffles 8 are provided inside the air chamber 1, and two through holes 9 and two sliding grooves 10 are also provided. The external shape of the air box 1 is a sealed cylinder, and the air box 1 is made of transparent glass. The height of the air box 1 is 0.54m, and the height of the baffle 8 and the rotating cylinder 6 is 0.56m. The thickness of the top plate 4 and the bottom plate 5 is 0.005m.

[0010] Method 1: Ignite the fuel and place it at the center of the bottom of the gas chamber 1. The fuel burns on the top of the base plate 5. The gas supply pipe introduces air or oxygen into the gas chamber 1 through four vents 11. As the fuel combustion rapidly consumes the oxygen in the device, and the heated air rises, the pressure inside the combustion chamber decreases. The resulting pressure difference forces the gas in the gas compartment to enter the combustion chamber. Due to the arc-shaped circular wall design inside the gas chamber 1, the incoming gas quickly forms a transverse tangential circulation around the ignition source, thus generating a turbulent flame. Observation systems, thermocouple systems, etc., can be installed on the outside of the gas chamber 1 to conduct conventional turbulent flame observation experiments. Since the experiment is conducted in a closed environment, the volume of the incoming gas can be quantitatively measured by calculating the volume of the gas chamber 1 and controlling the flow rate of the input gas through the gas supply pipe.

[0011] Method 2: Insert the rotating cylinder 6 into the upper part of the gas box 1 through the movable hole 7. The bottom end of the rotating cylinder 6 contacts the annular groove 12. Rotate the rotating cylinder 6. During the rotation, one side of the gas will enter the combustion zone, while the other side will be blocked. The gas supply pipeline introduces the combustion-supporting gas oxygen or air into two opposite gas zones A through four vent holes 11, and introduces a mixture of inert gas or halogenated hydrocarbon extinguishing agent into the other two opposite gas zones B. Ignite the fuel and place it in the center of the bottom of the gas box 1. The fuel burns on the bottom plate 5. Slowly rotate the rotating cylinder 6 to connect the two combustion-supporting gas zones A with the combustion zone and block the two gas extinguishing agent zones B from the combustion zone. The pressure difference forces the gas in the gas zone A into the combustion zone. Due to the arc-shaped circular wall design inside the gas box 1, the incoming gas quickly forms a circulation around the fire source, thereby generating a turbulent flame. After the flame stabilizes, slowly rotate the rotating drum 6 to isolate the two gas zones A from the combustion zone and connect the two gas extinguishing agent zones B with the combustion zone. Under the action of pressure difference, the gas extinguishing agent can enter the combustion zone, and the effects of inert gas and halogenated hydrocarbon gas on the turbulent flame can be dynamically observed from the outside.

[0012] After the experiments in Method 1 and Method 2, stop the gas supply from the gas pipeline, rotate the rotating cylinder 6 to a certain angle and insert the baffle 8 to completely seal the gas in the gas box 1 and prevent it from diffusing into the atmosphere.

Claims

1. A turbulent flame experimental apparatus, comprising a gas chamber, a combination plate disposed inside the gas chamber to separate its internal space, and a baffle plate to close the air inlet between two adjacent combination plates. Each combination plate consists of a partition plate and an arc-shaped plate fixedly connected as one unit, with the side of the partition plate facing away from the arc-shaped plate fixedly connected to the inner wall of the gas chamber. Each arc-shaped plate forms a combustion zone with an arc-shaped circular wall. The partition plate and the baffle plate are slidably connected. A top plate and a bottom plate are fixedly disposed at the top and bottom of the gas chamber, respectively. A rotating cylinder is movably connected inside the gas chamber. The rotating cylinder is used to block or connect the air inlet and the combustion zone. The top plate has an movable hole adapted to the rotating cylinder so that the rotating cylinder can be inserted into the gas chamber. The rotating cylinder is rotatably connected to the bottom plate. The top plate has a through hole adapted to the baffle plate so that the baffle plate can be inserted into the gas chamber. The top of the bottom plate has a sliding groove adapted to the baffle plate. Ventilation holes are provided around the bottom plate.

2. The apparatus of claim 1, wherein: The combination plate is configured as four, with the four partitions and four arc-shaped plates distributed at equal angles around the central axis of the gas box, dividing the gas box into four gas compartments in a centrally symmetrical manner, and the four gas compartments are respectively connected to four vents.

3. The apparatus of claim 1, wherein: The rotating drum is cylindrical in shape, with the upper section of its side wall being a complete cylinder and the lower section having symmetrical through grooves along the axial direction for connecting the air inlet and the inner cavity of the rotating drum.

4. The apparatus of claim 1, wherein: The base plate has an annular groove adapted to the rotating cylinder, and the rotating cylinder is movably connected to the annular groove.

5. The apparatus of claim 1, wherein: The total number of baffles is 2 or 4.

6. The apparatus of claim 1, wherein: The height of the baffle and / or the rotating cylinder is greater than that of the air box, preferably greater than the sum of the height of the air box, the thickness of the top plate, and the thickness of the bottom plate. For example, the height of the air box is 0.54m, the height of the baffle or rotating cylinder is 0.56m, and the thickness of the top plate and the bottom plate are both 0.005m.

7. The apparatus as claimed in any of the prior claims, wherein, The air box is made of transparent glass.

8. The apparatus of claim 1, wherein, The arc of the curved plate is 0.5π.

9. The apparatus of claim 1, wherein, The partition is a rectangular plate.

10. The apparatus of claim 1, wherein, The partitions and the curved plates in the same composite panel are tangent; the partitions of two adjacent composite panels can be perpendicular to each other.

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