Heat flux density measuring system for closed environment

Abstract

The invention discloses a heat flux density measurement system for a closed environment, and belongs to the field of measurement of heat damage parameters in explosion fireballs of combustion damage weapons. Comprising a total heat flow density sensor, a protective baffle, a mounting plate, a sealing gasket, a mounting cylinder, a cold water pipe, a hot water pipe, a circulating booster water pump, a flowmeter, a manual ball valve, a water tank, a temperature thermocouple, a signal acquisition and control line and a signal acquisition and control system. The total heat flux sensor is subjected to effective anti-fragment protection through a protection baffle with a large front part and a small rear part, and the rear end of the total heat flux sensor is connected with a circulating water cooling system capable of being remotely controlled, so that the total heat flux sensor is effectively cooled; the long-term reliable work of the sensor under the condition of high heat flux in a combustion damaged weapon explosion fireball is ensured; the device can be conveniently installed in a container or a closed / semi-closed tunnel, can also be fixed outside a fireball, is synchronously suitable for measuring the internal / external heat flux density in the explosion fireball, and meets the thermal damage effect test requirements of combustion damaged weapons under different test conditions.

Description

Technical Field

[0001] The invention belongs to the field of combustion heat damage parameter measurement and evaluation, and in particular relates to a heat flux density measurement system for a closed environment. Background Art

[0002] Incendiary weapons such as thermobaric bombs and thermite bombs have extremely strong thermal effects, which are very useful for attacking closed / semi-closed underground fortifications or buildings. The existing evaluation parameters mainly focus on the development process of the combustion fireball after the weapon is detonated, the maximum temperature of the fireball, and the radiation heat flux density outside the extension area of ​​the fireball. There is little research on thermal effect parameters such as the temperature and heat flux density inside the fireball, which is not conducive to the evaluation of the heat energy transfer process and thermal damage effect within the coverage area of ​​the fireball of incendiary weapons. Therefore, it is very necessary to develop a measurement technology for the heat flux density inside the fireball of incendiary weapons. Summary of the invention

[0003] (I) Purpose of the invention

[0004] The purpose of the present invention is to provide a heat flux density measurement system that can be used in a closed environment to solve the technical problem of measuring the heat flux density inside the explosion fireball of a burning and damaging weapon.

[0005] (II) Technical solution

[0006] In order to achieve the above-mentioned purpose and solve the technical problem, the present invention proposes a heat flux density measurement system for a closed environment, which specifically includes a total heat flux density sensor 1, a protective baffle 2, a mounting plate 3, a sealing gasket 4, a mounting cylinder 5, a cold water pipe 6, a hot water pipe 7, a circulating booster water pump 8, a flow meter 9, a manual ball valve 10, a water tank 11, a temperature measuring thermocouple 12, a signal acquisition and control line 13, and a signal acquisition and control system 14.

[0007] The signal line of the total heat flux density sensor 1 is led out from the tail, and is used to measure the total heat flux density of the sensor position within the coverage area of ​​the burning weapon fireball. Its installation interface is a standard fine-thread sealing external thread. Two stainless steel circulating water pipes are designed at the tail for circulating water cooling.

[0008] The opening of the protection baffle 2 is large outside and small inside. Its main function is to protect the total heat flux density sensor 1 at the bottom position to prevent the high-speed splashes generated by combustion from damaging the sensor and ensure the effective survival of the sensor. The rear part is designed with a fine-tooth sealing internal thread;

[0009] The mounting plate 3 is made of high-nickel stainless steel and can maintain strong strength at high temperatures. The central part of the mounting plate 3 is designed with a standard fine-pitch internal thread with the same interface size as the total heat flux density sensor 1, which is used to install the total heat flux density sensor 1 and effectively isolate the hot end and the cold end of the sensor;

[0010] The size and structure of the sealing gasket 4 are consistent with those of the sealing baffle 3, and its main function is to ensure effective sealing of the protection baffle 2 and the mounting cylinder 5 under long-term high temperature and high pressure conditions;

[0011] The front end surface of the installation cylinder 5 is processed with round steel, and is sealed with the retaining seal 4 and the installation baffle 3. The frontmost part is provided with the same external thread as the rear part of the protection baffle 2, and the rear end is designed with two sealing baffles, which can effectively isolate the high-temperature gas in the cavity and ensure the temperature resistance and safety of the rear end device;

[0012] The cold water pipe 6 and the hot water pipe 7 are made of high-strength stainless steel. Their function is to connect the total heat flux density sensor 1 with the rear-end circulating water cooling system. Their size is exactly the same as the two stainless steel water pipes of the total heat flux density sensor 1. The two can be quickly connected through the pressure-resistant stainless steel ferrule thread.

[0013] The circulating booster water pump 8 is powered by direct current, and its function is to promote the high-speed circulation of water in the water tank, improve the cooling efficiency, ensure that the rear end of the total heat flux density sensor 1 is kept in a safe operating temperature range, and the water inlet and outlet are consistent with the cold water pipe 6 and the hot water pipe 7;

[0014] The flow meter 9 is an electromagnetic ratio flow meter, which is used to monitor the flow in the circulating water cooling system, so that the user can understand the operation of the circulating water cooling system. The size is consistent with the cold water pipe 6 and the hot water pipe 7;

[0015] The manual ball valve 10 is made of stainless steel, and two are set on the cold water pipe 6 and the hot water pipe 7, respectively connected to the water inlet of the circulating booster water pump 8 and the flow meter 9. The size of the water inlet and outlet is the same as that of the cold water pipe 6 and the hot water pipe 6, and is used to switch the inlet and outlet water of the system;

[0016] The water tank 11 is made of stainless steel and is used to store cooling water. It is directly connected to the cold water pipe 6 and the hot water pipe 7 at the bottom and top respectively. A safety valve is set at the top to automatically release air and pressure when the pressure exceeds the limit.

[0017] The temperature measuring thermocouple 12 is a thermocouple with a national standard graduation number, located at the lower part of the water tank 11, and is used to measure the temperature of the circulating water;

[0018] The signal acquisition and control line 13 includes a pair of 2-core dedicated lines for heat flow density sensors, a pair of 2-core 12V low-voltage power supply lines for circulating booster pumps, a pair of 2-core 4-20mA DC current signal output lines for flow meters, and a pair of 2-core S-type thermocouple compensation wires, which are used for signal acquisition and control of the measurement system, and the length of which can be dynamically adjusted according to the safety distance;

[0019] The signal acquisition and control system 14 integrates the signal acquisition of the total heat flux density sensor 1, the power on / off control of the circulating booster water pump 8, the signal acquisition of the flow meter 9 and the signal acquisition of the temperature measuring thermocouple 12. It is placed at a safe distance and can be operated manually or remotely by personnel.

[0020] At the same time, the present invention also provides a method for installing and using a heat flux density measurement system for a closed environment, which specifically comprises the following steps:

[0021] Step 1: After the total heat flux density sensor 1 is threadedly connected and fixed to the mounting plate 3, bolts, sealing gaskets 4 and mounting cylinder 5 are used to seal and connect to ensure the air tightness of the contact surface. The signal line and stainless steel water pipe of the total heat flux density sensor 1 are led out from the rear end of the mounting cylinder 5.

[0022] Step 2: After the output signal of the total heat flux density sensor 1 is tested to be normal, the sealing internal thread at the rear of the mounting plate 2 is sealed and connected with the sealing internal thread at the front of the mounting cylinder 5 to complete the installation and fixation of the front end of the total heat flux density sensor 1;

[0023] Step 3, according to the actual test situation, the tail of the protective baffle 2 is flushly installed and fixed in the predetermined explosion fireball. If the explosion test is carried out in a container, it can be installed and fixed by welding. If the explosion test is carried out in a closed / semi-closed tunnel, it can be fixed in the corresponding position of the tunnel by pre-cast concrete.

[0024] Step 4, after the installation and fixation are completed, the stainless steel circulating water pipe designed at the tail of the total heat flux density sensor 1 is connected to the cold water pipe 6 and the hot water pipe 7 by using stainless steel ferrule threads for quick sealing, and is connected to the outlets of the circulating booster water pump 8 and the flow meter 9 by using stainless steel ferrule threads, and then the manual ball valve 10 and the water tank 11 are connected by stainless steel ferrule threads to complete the installation of the circulating water cooling system;

[0025] Step 5, use the signal acquisition and control line 13 to connect the signal line of the stack type total heat flux density sensor 1, the power supply line of the circulating booster water pump 8, the signal output line of the flow meter 9, the temperature measuring thermocouple 12 and the signal acquisition and control system 14 in sequence, and complete the on-off detection of each signal line in turn to complete the acquisition and control system connection;

[0026] Step 6, debug the circulating water cooling system, first open the two manual ball valves 10, observe whether there is any water leakage in the pipes and water tanks, and then control the flow meter 9 and the circulating booster water pump 8 to open in sequence through the acquisition control system, monitor whether the circulating water flow of the flow meter 9 reaches the expected value, whether the power supply voltage of the circulating booster water pump 8 is stable, and complete the test after continuous stable operation for a long period of time without any water leakage, close the circulating booster water pump 8 and the flow meter 9, and solidify the system status;

[0027] Step 7, before the combustion weapon explosion test is carried out, the control channel of the flow meter 9, the power supply channel of the circulating booster water pump 8, the signal acquisition channel of the total heat flux density sensor 1 and the signal acquisition channel of the temperature measuring thermocouple 12 are controlled in sequence through the acquisition control system to start continuous measurement.

[0028] (III) Effective income

[0029] 1. The total heat flux density sensor of the present invention is effectively protected against fragments by a protective baffle with a large front and a small rear. It can be installed inside an explosion fireball to measure the change of the total heat flux density during the combustion process, and realize the effective measurement of the heat energy change transfer process inside the explosion fireball of a burning weapon;

[0030] 2. The present invention connects a remotely controllable circulating water cooling system to the rear end of the total heat flux density sensor 1, which can effectively cool the total heat flux density sensor and ensure that the sensor can work reliably for a long time under high heat flux conditions in the burning fireball;

[0031] 3. The present invention can be conveniently installed in a container or a closed / semi-closed cavern, or can be installed and fixed outside a fireball, and is simultaneously applicable to the measurement of internal / external heat flux density inside a burning fireball, meeting the requirements for testing the thermal damage effects of burning weapons under different test conditions;

[0032] 4. The present invention has the advantages of strong anti-destruction ability, high heat flux resistance, and easy installation and fixation, and has a good application prospect in the field of measuring thermal damage parameters inside the fireball of burning and damaging weapons. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a system structure diagram of the present invention;

[0034] Among them, 1-total heat flux density sensor, 2-protective baffle, 3-mounting plate, 4-sealing gasket, 5-mounting cylinder, 6-cold water pipe, 7-hot water pipe, 8-circulating booster water pump, 9-flow meter, 10-manual ball valve, 11-water tank, 12-temperature measuring thermocouple, 13-signal and acquisition control line, 14-signal acquisition and control system.

[0035] Figure 2 It is a structural diagram of the protective baffle;

[0036] Figure 3 It is the structural diagram of the mounting plate;

[0037] Figure 4 It is a structural diagram of the installation cylinder. DETAILED DESCRIPTION

[0038] The present invention will be explained and illustrated in detail below with reference to the accompanying drawings and embodiments.

[0039] The present invention mainly aims at the technical difficulties in measuring the heat flux density of flammable substances during the combustion and explosion process in a semi-closed / closed plant or a simulated plant, and provides a measurement system that can be used to reliably obtain the heat flux density parameters during the combustion process of the explosion experiment.

[0040] A heat flux measurement system for a closed environment, such as Figure 1 As shown, total heat flux density sensor 1, protection baffle 2, mounting plate 3, sealing gasket 4, mounting cylinder 5, cold water pipe 6, hot water pipe 7, circulating booster water pump 8, flow meter 9, manual ball valve 10, water tank 11, temperature measuring thermocouple 12, signal acquisition and control line 13, signal acquisition and control system 14;

[0041] The total heat flux density sensor 1 is a thermopile heat flux density sensor with a measuring range of 0 to 30 MW / m 2 , the signal output range is 0-10mV voltage, the signal line is led out from the tail, and its installation interface is a standard fine-tooth sealed external thread. Two stainless steel circulating water pipes are designed at the tail, with an inner diameter of 2-3mm and an outer diameter of 4-6mm. The protective baffle 2 is made of 16Mn steel, with a maximum outer diameter of 180-200mm, an inner diameter of 100-140mm, and a length of 100-160mm. The mounting plate 3 is made of high-nickel stainless steel, with a diameter of 80-120mm and a thickness of 5-20mm, and can maintain high strength at 1500℃. The sealing gasket 4 is made of high-temperature resistant graphite material, with a diameter of 80-120mm and a thickness of 10-20mm, and can maintain sealing effectiveness at a long-term high temperature of 600℃. The mounting cylinder 5 is made of 16Mn steel, with a total length of 80-120cm, a maximum outer diameter of 220-320mm, and two sealing partitions are set inside. After completing the calibration and testing of the total heat flux density sensor 1, use a sealed threaded connection to install the total heat flux density sensor 1 on the fixed mounting plate 3, then pass the signal line of the total heat flux density sensor 1 and the hot and cold water pipes through the sealing gasket 4 and the two closed partitions of the mounting cylinder 5 in turn, use the hexagon socket bolts to fix the sealing partition 3 to the front end face of the mounting cylinder 5, and finally install the protective baffle 2 at the front end of the mounting cylinder 5 to complete the installation of the total heat flux density sensor 1.

[0042] The cold water pipe 6 and the hot water pipe 7 are made of high-strength stainless steel, with an inner diameter of 2-5 mm, an outer diameter of 4-6 mm, and a length of 10-30 m. They can be adjusted according to the test requirements to facilitate the installation of the circulating booster water pump 8 and the flow meter 9 in a safe position to ensure that the circulating booster water pump 8 and the flow meter 9 work reliably during the test. Use stainless steel ferrule threads to seal the cold water pipe 6 and the hot water pipe 7 with one end of the stainless steel circulating water pipe of the total heat flux density sensor 1, and the other end is connected to the water inlet and outlet of the circulating booster water pump 8 and the flow meter 9. Then use stainless steel ferrule threads to connect the cold water pipe 6 and the hot water pipe 7 to the manual ball valve 10, and finally use stainless steel ferrule threads to connect the manual ball valve 10 to the water tank 11.

[0043] The circulating booster water pump 8 is powered by 12V DC, with a rated flow rate of 5 to 15L / min. The size of the water inlet / outlet is the same as that of the cold water pipe 6 and the hot water pipe 7. The output signal of the flow meter 9 is 4 to 20mA, and its range is 5 to 20L / min. The size of the water inlet / outlet is the same as that of the cold water pipe 6 and the hot water pipe 7. The water tank 11 is made of stainless steel, with a wall thickness of 3 to 5mm and a volume of 10 to 30L. A safety valve that can automatically relieve pressure is set on the top, which automatically releases air and relieves pressure after the pressure exceeds the limit of 300kPa. The temperature measuring thermocouple 12 set at the bottom is sealed and connected to the water tank to measure the temperature of the circulating water. Two stainless steel inlet / outlet water pipes with an inner diameter of 2 to 3mm, an outer diameter of 4 to 6mm, and a length of 0.5 to 1m are designed at the upper and lower parts respectively, which are directly connected to the water tank. Use stainless steel ferrule threads to seal and connect the stainless steel water in the water tank 11 with the water outlet and water inlet of the circulating booster water pump 8 and the flow meter 9, thereby completing the connection between the total heat flux density sensor 1 and the circulating water cooling system.

[0044] Use the signal acquisition and control line 13 to connect the 0-10mV voltage output signal line of the total heat flux density sensor 1, the 12V DC power supply line of the circulating booster water pump 8, the 4-20mA signal line of the flowmeter 9, and the compensation wire of the temperature thermocouple 12 to the signal acquisition and control system 14 according to the corresponding control channel to complete the assembly of the entire measurement system, and manually open the two manual ball valves 10. Before starting the test, first open the signal acquisition and control system 14, check whether the signal output of the total heat flux density sensor 1 is normal, then check whether the signal output of the flowmeter 9 is normal, and finally open the power supply channel of the circulating booster water pump 8 to start system debugging. During the debugging process, monitor the 0-10mV voltage output of the total heat flux density sensor 1 and the 4-20mA current output of the flowmeter 9 within the normal range. After the connection is stable and running for 10-20 minutes, check whether all pipeline interfaces are leaking. If there is no leakage, complete the system test and curing. Finally, according to the relevant requirements of the combustion test, the rear end face of the protective baffle 2 can be welded and fixed to the outer wall of the container, poured on the wall of the tunnel using cast-in-place cement, or fixed in other ways at a measuring point at a certain distance from the fireball to carry out the test.

[0045] Embodiment 1:

[0046] First, the measurement range is 0 to 20 MW / m 2 The total heat flux density sensor 1 is installed and fixed at the center of a sealing partition 3 made of INCONEL600 or the same domestic grade material with a diameter of 98mm and a thickness of 16mm by means of fine thread sealing bolt connection;

[0047] Second, the heat flux density signal line of the total heat flux density sensor 1 and two stainless steel circulating water pipes with an inner diameter of 4mm and an outer diameter of 6mm are passed through a sealing gasket 4 with a diameter of 98mm and a thickness of 12mm, which is made of high-temperature resistant graphite material and a mounting cylinder 5 made of 16Mn steel with a total length of 950cm and a maximum outer diameter of 280mm and two sealing partitions arranged inside. The signal line of the heat flux density sensor 1 and the two stainless steel circulating water pipes are led out from the mounting cylinder 5.

[0048] Third, the rear end face of the protective baffle 2, which is made of 16Mn steel in one piece and has a maximum outer diameter of 180mm, an inner diameter of 100mm and a length of 130mm, is fixed to the front end of the mounting cylinder 5 through a pre-designed fine-tooth sealing thread to complete the installation of the total heat flux density sensor 1.

[0049] Use stainless steel ferrule threads to process high-strength stainless steel, with an inner diameter of 4mm, an outer diameter of 6mm, and a length of 15m to connect the cold water pipe 6 and the hot water pipe 7 to the two stainless steel circulating water pipes of the total heat flux density sensor 1. Secondly, use stainless steel ferrule threads to seal the cold water pipe 6 with the interface inner diameter of 4mm, outer diameter of 6mm, output signal of 4~20mA, and range of 15L / min flowmeter 9 inlet. Thirdly, use stainless steel ferrule threads to seal the cold water pipe 6 with the interface inner diameter of 4mm, outer diameter of 6mm, output signal of 4~20mA, and rated flow of 15L / min. The outlet of the circulating booster water pump 8 is sealed. Thirdly, use stainless steel ferrule threads to process stainless steel with a wall thickness of 4mm, a volume of 20L, and a 300kPa air release pressure relief valve installed on the top. The temperature measuring thermocouple 12 uses the national standard S-type thermocouple, which is sealed and connected to the water tank 11 to complete the connection of the circulating water cooling system.

[0050] Use the signal acquisition and control line 13 to connect the total heat flux density sensor 1 with a specification of 2X1mm 2 , 0~10mV voltage output signal line, specification 2X10mm 2 , 12V DC powered circulating booster pump 8 power supply line, and specification 2X0.5mm 2 , 4~20mA current output flowmeter 9 signal line, specification 2X1mm 2, the temperature measuring thermocouple 12 of the S-type thermocouple compensation wire is connected to the signal acquisition and control system 14 according to the corresponding control channel to complete the assembly of the entire measurement system, and manually open the two manual ball valves 10. Before starting the test, first open the signal acquisition and control system 14, check whether the signal output of the total heat flux density sensor 1 is normal, then check whether the signal output of the flow meter 9 is normal, and finally open the power supply channel of the circulating booster water pump 8 to start system debugging. During the debugging process, the 0-10mV voltage output of the total heat flux density sensor 1 and the 4-20mA current output of the flow meter 9 are within the normal range. After the connection is stably operated for 20 minutes, check whether all pipeline interfaces are leaking. If there is no leakage, complete the system test and curing. After the system is scheduled to run normally, carry out experimental testing.

[0051] Application example of the present invention: In a dust combustion heat flux density signal measurement experiment in a simulated flour mill workshop, according to relevant test requirements, cast-in-place cement is used to fix the rear end face of the protective baffle 2 on the wall of the simulated factory to complete the on-site installation of the total heat flux density sensor 1; the signal acquisition and control line 12 is used to connect the signal acquisition and control system 14; then the circulating booster water pump 8 is turned on to start debugging, and the experiment is started after the system is connected and operated for 20 minutes, and the signal acquisition is triggered at the same time, and the complete change curve of the heat flux density signal of the simulated factory workshop after the explosion is measured. The test results show that the maximum output value of the total heat flux density sensor 1 is ≥10MW / m 2 The maximum measurement time is 10 minutes, and the maximum temperature output of the S-type temperature measuring thermocouple 12 of the water tank 11 is ≤50°C. The test result is authentic and reliable, and the expected measurement effect is achieved.

Claims

1. A heat flux measurement system for a closed environment, characterized in that: It comprises a total heat flux density sensor (1), a protective baffle (2), a mounting plate (3), a sealing gasket (4), a mounting cylinder (5), a cold water pipe (6), a hot water pipe (7), a circulating booster water pump (8), a flow meter (9), a manual ball valve (10), a water tank (11), a temperature measuring thermocouple (12), a signal acquisition and control line (13), and a signal acquisition and control system (14); The signal line of the total heat flux density sensor (1) is led out from the tail, and is used to measure the total heat flux density at the location of the closed environment sensor. Its installation interface is a standard fine-thread sealing external thread. Two stainless steel circulating water pipes are designed at the tail for circulating water cooling; The opening of the protection baffle (2) is large on the outside and small on the inside, and is used to protect the total heat flux density sensor (1) at the bottom position to prevent high-speed splashes generated by the explosion from damaging the sensor, thereby ensuring the effective survival of the sensor. The rear portion thereof is designed with a fine-thread sealing internal thread; A standard fine-pitch internal thread with the same size as the interface of the total heat flux density sensor (1) is designed in the middle of the sealing partition (3) for installing the total heat flux density sensor (1) to effectively isolate the hot end and the cold end of the sensor; The size and structure of the sealing gasket (4) are consistent with those of the sealing baffle (3), and are used to ensure effective sealing between the protective baffle (2) and the mounting cylinder (5) under long-term high temperature and high pressure conditions; The front end of the installation cylinder (5) is sealed with the sealing pad (4) and the sealing partition (3), the frontmost part of the installation cylinder (5) is provided with the same external thread as the rear part of the protective baffle (2), and two sealing plates are designed at the rear end to effectively isolate the high-temperature gas in the cavity, thereby ensuring the temperature resistance and safety of the rear end device; The cold water pipe (6) and the hot water pipe (7) are used to connect the total heat flux density sensor (1) and the rear-end circulating water cooling system. The sizes are exactly the same as the two stainless steel water pipes of the total heat flux density sensor (1). The two can be quickly connected through the pressure-resistant stainless steel ferrule thread. The circulating booster water pump (8) is powered by direct current and is used to promote the high-speed circulation of water in the water tank, thereby improving the cooling efficiency and ensuring that the rear end of the total heat flux density sensor (1) is kept within a safe operating temperature range, and the water inlet and outlet are consistent with the cold water pipe (6) and the hot water pipe (7); The flow meter (9) is an electromagnetic ratio flow meter, which is used to monitor the flow in the circulating water cooling system, so that the user can understand the operation of the circulating water cooling system. The size is consistent with that of the cold water pipe (6) and the hot water pipe (7); Two manual ball valves (10) are provided on the cold water pipe (6) and the hot water pipe (7), respectively connected to the water inlet of the circulating booster water pump (8) and the flow meter (9), and the sizes of the water inlet and outlet are the same as those of the cold water pipe (6) and the hot water pipe 6, and are used to switch the inlet and outlet water of the system; The water tank (11) is used to store cooling water and is directly connected to the cold water pipe (6) and the hot water pipe (7) at the bottom and top respectively. A safety valve is arranged at the top of the water tank to automatically release air and pressure when the pressure exceeds the limit value. The temperature measuring thermocouple (12) is a thermocouple with a national standard graduation number, located at the lower part of the water tank (11), and is used to measure the temperature of the circulating water; The signal acquisition and control line (13) includes a pair of 2-core heat flow density sensor dedicated lines, a pair of 2-core circulating booster water pump 12V low-voltage power supply lines, a pair of 2-core flow meter 4-20mA DC current signal output lines, and a pair of 2-core S-type thermocouple compensation wires, which are used for signal acquisition and control of the measurement system; The signal acquisition and control system 14 integrates the signal acquisition of the total heat flux density sensor (1), the power on / off control of the circulating booster water pump (8), the signal acquisition of the flow meter (9) and the signal acquisition of the temperature measuring thermocouple (12). The signal acquisition and control system 14 is placed at a safe distance and can be operated manually or remotely.

2. A heat flux measurement system for a closed environment according to claim 1, characterized in that: The total heat flux density sensor (1) is a thermopile heat flux density sensor with a measuring range of 0 to 30 MW / m 2 , the signal output range is 0~10mV voltage.

3. A heat flux density measurement system for a closed environment according to claim 1, characterized in that: The protective baffle (2) is made of 16Mn steel and is processed in one piece. Its maximum outer diameter is 180-200 mm, its inner diameter is 100-140 mm, and its length is 100-160 mm.

4. The heat flux measurement system for a closed environment according to claim 1, characterized in that: The mounting plate (3) is made of high-nickel stainless steel, has a diameter of 80 to 120 mm, a thickness of 5 to 20 mm, and can maintain a relatively high strength at 1500°C.

5. The heat flux measurement system for a closed environment according to claim 1, characterized in that: The sealing gasket (4) is made of high-temperature resistant graphite material and has a diameter of 80 to 120 mm and a thickness of 10 to 20 mm, and can maintain sealing effectiveness at a high temperature of 600° C. for a long period of time.

6. The heat flux measurement system for a closed environment according to claim 1, characterized in that: The installation cylinder (5) is made of 16Mn steel, has a total length of 80-120 cm, a maximum outer diameter of 220-320 mm, and is provided with two sealing partitions inside.

7. The heat flux density measurement system for a closed environment according to claim 1, characterized in that: The cold water pipe (6) and the hot water pipe (7) are made of high-strength stainless steel, with an inner diameter of 2 to 5 mm, an outer diameter of 4 to 6 mm, and a length of 10 to 30 m, which is adjusted according to test requirements.

8. The heat flux measurement system for a closed environment according to claim 1, characterized in that: The circulating booster water pump (8) is powered by 12V direct current, has a rated flow rate of 5 to 15 L / min, and the dimensions of the water inlet / outlet are the same as those of the cold water pipe (6) and the hot water pipe (7); the output signal of the flow meter (9) is 4 to 20 mA, and its measuring range is 5 to 20 L / min, and the dimensions of the water inlet / outlet are the same as those of the cold water pipe (6) and the hot water pipe (7).

9. The heat flux measurement system for a closed environment according to claim 1, characterized in that: The water tank (11) is made of stainless steel, has a wall thickness of 3 to 5 mm, and a capacity of 10 to 30 L. The safety valve automatically releases air and pressure when the pressure exceeds the limit of 300 kPa. The temperature measuring thermocouple (12) arranged at the bottom is sealed and connected to the water tank. Two stainless steel inlet / outlet water pipes with an inner diameter of 2 to 3 mm, an outer diameter of 4 to 6 mm, and a length of 0.5 to 1 m are respectively designed at the upper and lower parts and are directly connected to the water tank.

10. A method for installing and using the heat flux density measurement system for a closed environment as claimed in claims 1 to 9, characterized in that: The steps include: Step 1: After the total heat flux density sensor (1) is threadedly connected and fixed to the mounting plate (3), bolts, a sealing gasket (4) and a mounting cylinder (5) are used to seal and connect them to ensure the air tightness of the contact surface. The signal line of the total heat flux density sensor (1) and a stainless steel water pipe are led out from the rear end of the mounting cylinder (5); Step 2: After the output signal of the total heat flux density sensor (1) is tested to be normal, the sealing internal thread at the rear of the protection baffle (2) is sealed and connected with the sealing internal thread at the front of the installation cylinder (5), thereby completing the installation and fixation of the front end of the total heat flux density sensor (1); Step 3: According to the actual test situation, the tail of the protective baffle (2) is flushly installed and fixed in the predetermined combustion area. If the combustion test is carried out in a container, it is installed and fixed by welding; if the combustion test is carried out in a closed plant, it is fixed on the wall of the plant by pre-cast concrete; Step 4, after the total heat flux density sensor (1) is installed and fixed, the stainless steel circulating water pipe designed at the tail of the total heat flux density sensor (1) is quickly sealed and connected to the cold water pipe (6) and the hot water pipe (7) using stainless steel ferrule threads, and is connected to the outlets of the circulating booster water pump (8) and the flow meter (9) using stainless steel ferrule threads, and then connected to the manual ball valve (10) and the water tank (11) using stainless steel ferrule threads, respectively, to complete the installation of the circulating water cooling system; Step 5, using the signal acquisition and control line (13), the signal line of the stack type total heat flux density sensor (1), the power supply line of the circulating booster water pump (8), the signal output line of the flow meter (9), the temperature measuring thermocouple (12) and the signal acquisition and control system 14 are connected in sequence, and the on-off detection of each signal line is completed in sequence to complete the acquisition and control system connection; Step 6, debug the circulating water cooling system, first open the two manual ball valves (10), observe whether there is water leakage in the pipeline and the water tank, and then control the flow meter (9) and the circulating booster water pump (8) to open in sequence through the acquisition control system, monitor whether the circulating water flow of the flow meter (9) reaches the expected value, and whether the power supply voltage of the circulating booster water pump (8) is stable. After the system runs stably for a long period of time without any water leakage, the test is completed, and the circulating booster water pump (8) and the flow meter (9) are closed to solidify the system state; Step 7, before the combustion damage weapon explosion test is carried out, the control channel of the flow meter (9), the power supply channel of the circulating booster water pump (8), the signal collection channel of the total heat flux density sensor (1) and the signal collection channel of the temperature measuring thermocouple (12) are controlled in sequence by the acquisition control system to start continuous measurement.

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