226 results about "Flame propagation" patented technology

The invention discloses a numerical calculation method for simulating combustion of iron powder group particles, belongs to the field of numerical simulation calculation of iron powder combustion, can perform numerical simulation on single-particle and iron powder group combustion under a microgravity condition, quantitatively analyzes the influence of differential diffusion on single-particle iron powder and iron powder group combustion flame temperature, and improves the calculation accuracy of the single-particle and iron powder group combustion flame temperature. And meanwhile, the influence of iron powder combustion characteristics and flame propagation speeds under different iron powder and oxygen concentration conditions is considered. The method has a certain guiding significance in research on low-propagation-speed lean-burn iron powder flames and subsequent application of iron powder fuel. The microgravity environment can eliminate the influence of convection and buoyancy, so that the combustion process is more stable and predictable, and the basic mechanisms of iron powder combustion, including combustion rate, oxidation process, phase change and the like, can be deeply researched.

The invention discloses a high-precision combustible gas detection system, and relates to the technical field of safety monitoring and environmental protection, and the main scheme is as follows: collecting multiple data of combustible gas; respectively calculating a diffusion rate, a combustion heat index and heat conductivity, and further calculating a gas concentration value; comparing a preset threshold value and judging whether the combustible gas concentration is in a normal range or not; if the combustible gas concentration is in a normal range, respectively calculating an explosion lower limit value and an explosion upper limit value to obtain a combustion speed; the flame propagation speed is calculated, and the combustion heat release rate is further obtained; calculating radiant heat flux based on the combustion heat release rate, comparing with a preset threshold value, and judging whether the radiant heat flux is in a safe state or not; according to the method, all-around monitoring and early warning can be carried out on various dangerous conditions related to the combustible gas, and the safety guarantee of the combustible gas use and existence environment is greatly improved.

The invention discloses an in-cylinder combustion process and chemical reaction mechanism-based hydrogen ammonia emission generation prediction system and method, and relates to the technical field of hydrogen internal combustion engine tail gas emission control, and the system comprises an input variable acquisition module, a combustion simulation module, a chemical reaction simulation module, an emission generation prediction module and an output interface module; according to the method, a mechanism-driven multi-physics field coupling prediction system is constructed, the simplified assumption limitation of a traditional empirical model is broken through, high-precision dynamic analysis of the emission characteristics of the hydrogen-ammonia engine is achieved, in combustion process simulation, in-cylinder turbulence mixing and flame propagation details are accurately described by using a CFD model, and in-cylinder combustion simulation is achieved. The chemical reaction module can significantly improve the prediction credibility of unburned fuel residues and pollutant generation through sensitivity analysis and mechanism optimization, in addition, through real-time coupling sensor data and simulation calculation, the abnormal emission trend can be pre-judged in advance, and a feedforward control basis is provided for the ammonia injection amount, the EGR rate and the ignition angle.

The utility model discloses an electric field combustion-supporting jet ignition device and an ammonia fuel engine, and relates to the technical field of internal combustion engines, the electric field combustion-supporting jet ignition device comprises a jet device, an auxiliary electrode, a spark plug and an ammonia sprayer, the jet device comprises a jet device main body and a jet nozzle, and the jet device main body is connected with the jet nozzle to form a pre-combustion chamber; the pre-combustion chamber is communicated with the main combustion chamber; the auxiliary electrode comprises a pre-combustion chamber auxiliary electrode and a main combustion chamber auxiliary electrode, the auxiliary electrode is connected with the control unit through an electrical circuit, and an electric field is formed in the pre-combustion chamber and the main combustion chamber; the spark plug is electrically connected with the control unit through an electrical circuit; and the ammonia spraying device is used for spraying ammonia gas into the pre-combustion chamber through a nozzle outlet of the ammonia spraying device, the ammonia gas is fully mixed with air in the pre-combustion chamber, the mixed gas is ignited at an ignition electrode of the spark plug under the action of an electric field, and the ammonia mixed gas in the main combustion chamber is ignited. Electric field combustion supporting is applied to the jet ignition device, and the combustion reaction rate and the flame propagation speed are increased.

The present application discloses a gas-fired water heater and a control method and control device therefor. The control method comprises the following steps: upon receiving an instruction for propagating a flame to a target combustion unit, obtaining a current fan speed and a current gas proportional valve secondary pressure; adjusting the current fan speed to a flame propagation fan speed FC, and adjusting the current gas proportional valve secondary pressure to a flame propagation secondary pressure CH; during adjustment of the gas proportional valve secondary pressure, maintaining a mapping relationship P=f(r) between the gas proportional valve secondary pressure and the fan speed, keeping the air-fuel ratio of the gas-fired water heater constant within a preset interval, and ensuring that the gas proportional valve secondary pressure at any moment during adjustment is larger than a secondary pressure flameout threshold CH'min corresponding to the fan speed at said moment; and controlling a target staging valve corresponding to the target combustion unit to be opened.

The invention relates to the technical field of cables, in particular to a multi-layer co-extrusion cable based on a low-smoke halogen-free flame-retardant composite layer and a preparation method of the multi-layer co-extrusion cable based on the low-smoke halogen-free flame-retardant composite layer, and the multi-layer co-extrusion cable structurally comprises a conductor layer, a double-layer insulating layer, a reinforced buffer layer and a composite sheath layer from inside to outside in sequence; wherein the double-layer insulating layer comprises an inner layer and an outer layer; the inner layer takes an ethylene-octylene copolymer as a core layer and takes a norbornene dianhydride grafted polyether ester elastomer as a shell layer, so that the material is endowed with high elasticity and impact resistance, and the cracking of the insulating layer is inhibited; the modified nano montmorillonite is dispersed into a nano lamellar barrier, so that heat diffusion is delayed, and low smoke and zero halogen are realized; the outer layer is composed of an ethylene-methyl acrylate matrix and di-tert-butyl phosphinic acid aluminum salt, the di-tert-butyl phosphinic acid aluminum salt is decomposed at high temperature to generate aluminum phosphate, a carbon layer is formed to isolate oxygen heat, and phosphorus-containing free radicals capture active free radicals to interrupt flame propagation.

The invention belongs to the technical field of coal mine safety research, and discloses a fuel-rich gas coal dust explosion residual gas secondary explosion test device which comprises a primary explosion container and a secondary explosion container, the primary explosion container is communicated with the secondary explosion container through a three-phase valve, and the three-phase valve is communicated with a gas sample bag; the pulverized coal spreading system comprises a first spreading machine and a second spreading machine which are fixedly arranged at the bottoms of the primary explosion container and the secondary explosion container in a penetrating manner respectively; the gas supply system comprises a premixing tank which is communicated with the primary explosion container and the secondary explosion container; and the image acquisition system comprises a first camera and a first infrared thermal imager which are arranged corresponding to the first explosion container, and a second camera and a second infrared thermal imager which are arranged corresponding to the secondary explosion container. According to the invention, the research on the flame propagation dynamic characteristic evolution mechanism under the influence of multiple parameters of fuel-rich gas coal dust explosion and residual gas explosion is realized, the experimental error is reduced, and the research cost is reduced.

The invention discloses a low dynamic fatigue type polyurethane elastomer, and relates to the technical field of organic polymer compounds, the low dynamic fatigue type polyurethane elastomer comprises 50-70 parts of polytetramethylene ether glycol, 75-100 parts of 1, 6-hexamethylene diisocyanate, 5-10 parts of a chain extender, 3-8 parts of a dispersant, 1-5 parts of a lubricant, 4-10 parts of a plasticizer, and 6-12 parts of a flame retardant filler. According to the low-dynamic-fatigue type polyurethane elastomer, due to the addition of the flame-retardant filler, during combustion, melamine is decomposed to generate non-combustible gases such as ammonia gas, the gases can dilute the concentration of oxygen and combustible gas in a combustion area and reduce the intensity of a combustion reaction, and meanwhile, phosphorus elements can form substances such as phosphoric acid and metaphosphoric acid at high temperature, so that the flame-retardant property of the polyurethane elastomer is improved. According to the present invention, the polyurethane elastomer and the flame retardant can capture free radicals in the gas phase and interrupt the chain reaction of combustion so as to inhibit the flame propagation, and can promote the char formation during the combustion process to form a compact carbon layer covering the surface of the polyurethane elastomer so as to provide good thermal insulation and oxygen insulation effects;

The invention discloses a plasma ignition and combustion-supporting cooperated cavity stable combustion ammonia burner which comprises a three-stage plasma ignition and combustion-supporting device and a three-stage fuel and air supply system, and the three-stage plasma ignition and combustion-supporting device comprises a first-stage plasma ignition and combustion-supporting device, a second-stage plasma ignition and combustion-supporting device and a third-stage fuel and air supply system. The second-stage plasma ignition and combustion-supporting device, the third-stage plasma ignition and combustion-supporting device and the three-stage fuel and air supply system are respectively a first-stage fuel and air supply system, a second-stage fuel and air supply system and a third-stage fuel and air supply system. The problems of low flame propagation speed, high ignition energy and the like existing in ammonia fuel combustion at present are solved, stable combustion of pure ammonia can be realized under the condition that hydrogen or other fossil fuels are not doped into ammonia gas by adopting a multi-stage plasma ignition and combustion-supporting device, assisting ammonia combustion and combining a bluff body combustion stabilizer, and a three-stage combustion stabilizing technology is adopted, so that stable combustion of pure ammonia is realized. And the stable combustion range of ammonia gas can be greatly expanded.

The present invention relates to the technical field of flame combustion, and discloses a constant-volume combustion device and method for discriminating flame flow states. The device includes a constant-volume combustion bomb cylinder pressure acquisition system and a flame schlieren image acquisition system. The refined pressure fluctuation state in the combustion cylinder is used as a new evaluation index, and then compared and analyzed with the flame front obtained under different working conditions according to the characteristic parameters of the flame flow state, so as to better quantify the influence of pressure fluctuation on the flame development process during flame propagation, and then make a detailed classification of the flame flow state changes due to fluid instability and heat-mass instability. Finally, it can lay a foundation for quantifying the influence of instability on flame propagation during flame propagation, and provide certain theoretical support for subsequent research on the basic theory of flame combustion.

The invention discloses a staged cracking ammonia internal combustion engine system which comprises an ammonia supply system, a first-stage catalytic cracker and a combustion chamber, the combustion chamber is connected with an air inlet channel and an exhaust channel, and a spark plug is installed on the combustion chamber; the ammonia supply system is used for providing low-pressure gaseous ammonia, the ammonia supply system is connected with an inlet of the first-stage catalytic cracker, and an outlet of the first-stage catalytic cracker is connected with the gas inlet channel; the first-stage catalytic cracker is connected with the exhaust passage through an exhaust branch pipe, a low-temperature catalyst for catalyzing ammonia to be decomposed into hydrogen and nitrogen is arranged in the first-stage catalytic cracker, and the inner wall of the combustion chamber is coated with a second-stage ammonia catalyst coating. Staged ammonia cracking is carried out at low temperature and high temperature, a small amount of ammonia is decomposed by the first-stage catalytic cracker to generate hydrogen, the ignition energy of the ammonia can be remarkably reduced by the small amount of hydrogen, and the flame propagation speed of ammonia combustion is increased; the secondary cracking in the combustion chamber efficiently decomposes ammonia through a catalyst coating, so that the oxidation rate and the combustion efficiency of ammonia are improved, and the emission of unburned ammonia is reduced.

The invention discloses a method for predicting the explosion intensity of a steam cloud based on a flame velocity. The method comprises the following steps: constructing a flame propagation prediction formula by integrating factors such as a gas cloud limitation degree, obstacle blockage, steam cloud activity and a flame propagation distance; collecting data in different scenes for fitting analysis, and determining values of undetermined parameters in the flame propagation prediction formula in different scenes; solving a flame propagation prediction formula to obtain a dimensionless flame velocity based on the value of the undetermined parameter in the target scene, and determining an actual flame velocity in combination with the sound velocity; based on the determined actual flame speed, predicting the explosion overpressure through a relational expression between the actual flame speed and the explosion overpressure established in the target scene; based on the predicted explosion overpressure, the explosion impulse is predicted through a relational expression between the explosion overpressure and the explosion impulse established in the target scene; and representing the explosion intensity of the steam cloud based on the predicted explosion overpressure and explosion impulse. The method is simple in process, high in reliability and wide in application range.

In certain embodiments, a significant improvement in H2-ICE performance can be achieved by a combination of active scavenging pre-combustion chamber technology and predictive model-based spark control to overcome the drawbacks of known combustion technologies. In certain embodiments, advanced combustion modeling and simulation of the ignition process, including spark events, arc movement and elongation, and resulting flame propagation, can be used to predict the relationship between spark energy / output, flow within the electrode gap, and flame growth (SOC) for different engines, different spark plugs, and various conditions. This information can be used to adjust the spark energy / output characteristics during the spark event of the same cycle in order to minimize SOC variations and significantly reduce the tendency of combustion anomalies such as backfire, knocking, and pre-ignition that prevent the achievement of high engine output density and efficiency.

This application relates to the field of kitchen appliance technology, and more particularly to an inner ring burner cap and a gas stove. The inner ring burner cap has an inner ring cavity; ignition holes and flame-preserving holes, respectively communicating with the inner ring cavity, are formed on the side walls of the inner ring burner cap. The ignition holes are configured opposite to the ignition needle, and the flame-preserving holes are configured opposite to the thermocouple; a main burner hole, communicating with the inner ring cavity, is provided at the top of the inner ring burner cap; an ignition groove, communicating with the inner ring cavity, is formed on the outer side wall of the inner ring burner cap, arranged around the axis of the inner ring burner cap, and located between the outlet of the flame-preserving hole and the outlet of the main burner hole. The ignition groove on the inner ring burner cap facilitates the upward propagation of the flame at the flame-preserving hole to form a flame at the main burner hole, enabling the inner ring burner cap to achieve rapid and stable flame propagation, thus improving the user experience.

This application provides a flame-retardant silicone and its preparation method. In this flame-retardant silicone, through the synergistic effect of boron-containing polysiloxane prepolymer and functionalized boron nitride, the flame-retardant silicone has an afterflame time of ≤5s at 800℃, an oxygen index of ≥36%, and has passed UL94V-0 certification. It can quickly form a ceramic barrier layer at high temperatures, effectively preventing flame propagation. The helical structure of the siloxane main chain, combined with the reinforcing effect of functional fillers such as nano-fumed silica, low-melting-point glass powder, and activated inorganic smoke suppressant and flame retardant, makes the tensile strength of the flame-retardant silicone ≥45N, and the permanent tensile modulus retention rate ≥85% under 125% radial shrinkage, exhibiting excellent tear resistance. This flame-retardant silicone is suitable for applications requiring high flame-retardant performance, such as new energy cables and electronic device protection.

This utility model discloses a high-efficiency flame-arresting and explosion-proof valve suitable for dusty gas environments, including a valve body, a valve disc, a counterweight device, and a self-locking device. The valve body includes a valve shell and a top cover plate. Inlet flanges and outlet flanges are provided on the left and right sides of the valve shell. The inner side of the inlet flange extends into the valve body and is equipped with a rubber ring. The upper side of the valve disc is welded to a rotating shaft via a rotating arm. The two ends of the rotating shaft are rotatably connected to the valve body via bearings. The counterweight device includes a counterweight, a slender rod, and a stop rod. The self-locking device is a combination of a spring pin and a locking switch. In the event of an explosion, the high-efficiency flame-arresting and explosion-proof valve provided by this utility model closes the valve disc and is locked by the self-locking device, effectively cutting off the propagation path, achieving flame arrest and explosion isolation, preventing the propagation of shock waves and flames generated by the explosion, effectively preventing secondary and multiple explosions, and effectively protecting the safety of personnel and upstream equipment.

The invention discloses a zero-low-carbon fuel combustion device based on catalytic heat surface combustion supporting and a control method thereof, and relates to the technical field of aviation power equipment.The zero-low-carbon fuel combustion device based on catalytic heat surface combustion supporting comprises a glow plug suitable for being installed on the wall face of a combustion chamber of an engine and stretching into the combustion chamber of the engine; the protective cover is arranged on the radial outer side of the glow plug, a cavity is formed between the inner circumferential surface of the protective cover and the outer circumferential surface of the glow plug, catalyst layers are arranged on the inner circumferential surface of the protective cover and the outer circumferential surface of the glow plug, a first opening communicated with the cavity is formed in the protective cover, and the first opening comprises a plurality of sub through holes formed at intervals; a second opening is formed between the protective cover and the glow plug; and the injector is suitable for injecting fuel into the first opening. The zero-low-carbon fuel combustion device based on catalytic heat surface combustion supporting has the advantages of being capable of achieving the zero-low-carbon target conveniently, good in ignition performance, high in flame propagation performance, long in service life and the like.

The utility model relates to a multi-sparking plug ignition system, combustion chamber and gas engine, multi-sparking plug ignition system includes precombustion chamber and second sparking plug, precombustion chamber is provided in dome structure center, precombustion chamber is provided with first sparking plug, precombustion chamber is provided with a plurality of jet orifice at interval along the circumference, second sparking plug is provided with second sparking plug. At least one spray hole points to a high-frequency detonation area near an exhaust throat of an exhaust passage in the combustion chamber, the second spark plug and the pre-combustion chamber are arranged between the air inlet passage and the exhaust passage in a spaced mode, and the second spark plug is close to the edge of the dome structure. The high-speed jet jetted by the pre-combustion chamber in the multi-spark-plug ignition system enables flame to reach the edge of the combustion chamber as soon as possible, and the second spark plug can accelerate combustion in the nearby space, so that the multi-spark-plug ignition system can effectively improve the flame propagation speed, shorten the time for the flame to propagate to the edge of the combustion chamber and improve the combustion efficiency. Flame can reach the edge of a combustion chamber of an engine as soon as possible, and the aim of reducing the knocking tendency is achieved.

The application discloses a kind of multi-stage linkage explosion venting test methods combined with powdery combustion inhibitor, it is related to explosion-proof engineering and safety detection technical field;The method is by constructing with explosion venting device, ignition system, powdery inhibitor delivery system and pressure and optical sensor test cabin, uses PLC to realize ignition, pre-delivery, pressure relief trigger, synchronous inhibition and afterflame inhibition and so on multi-stage linkage control;And through pressure, temperature and flame sensor real-time acquisition of multi-dimensional data of explosion process;By before ignition, ignition instant and in the process of pressure relief with different doses of powdery inhibitor, the explosion suppression performance under different linkage strategies can be systematically evaluated;The application can simultaneously obtain peak pressure, pressure rise rate, flame propagation speed and re-burning conditions and other multi-parameters, realize the quantitative evaluation of the explosion suppression efficiency of powdery combustion inhibitor under multi-stage linkage explosion venting conditions, with the advantages of good data integrity, strong repeatability and suitable for standardization explosion-proof test method construction.

The present application belongs to the field of afterburner design, and is an asymmetric afterburner internal step ignition structure, comprising a cone, a support plate and an ignition nozzle; an annular step ignition zone is provided in the middle of the cone, and the step ignition zone comprises a first step zone, a transition zone and a second step zone. During the ignition process of the afterburner, the fuel passes through the fuel nozzle in the first step zone through the casing and the support plate into the interior of the step, and is ignited by the ignition nozzle located at the center of gravity of the first step zone. The oil-gas mixture is first ignited and burned in the first step zone. Since the step angle of the first step zone is 90°, it can produce an obvious sudden expansion effect on the airflow, thereby constructing a stable recirculation zone, and at the same time has excellent flame propagation characteristics. The flame quickly propagates to the transition zone and the second step zone. The setting of the transition zone can make the vortex formed in the first step zone during the flame transfer more stable and will not fall off, thereby realizing fast and reliable ignition of the afterburner.

The utility model discloses a dry-type flame arrester for a coal mine gas conveying pipeline, which relates to the technical field of flame arresting of the coal mine gas conveying pipeline and comprises a shell component, a flame arresting part and a fastener. Through the combined design of the fire-retardant sleeve, the stainless steel wire mesh and the corrugated plate type fire-retardant disc, flame propagation can be effectively blocked, and gas explosion accidents are prevented; the flame arrester adopts the design of the shell assembly and the flame arresting part which are in mirror symmetry, is convenient to install and maintain, and ensures the stability of the structure through the connection of a fastener; the flame arrester is suitable for gas conveying pipelines with different pipe diameters, can meet the use requirements under different pressure conditions, and is wide in application range; when the gas passes through the flame arrester at the average flow speed of 15m / s, the pressure drop is less than or equal to 1kPa, so that the gas conveying efficiency is not influenced; in conclusion, the dry type flame arrester provided by the utility model can effectively solve the explosion problem in a coal mine gas conveying pipeline, insulates flame propagation, ensures the production safety of a coal mine, and has a wide application prospect.

The application provides a hydrogen-doped natural gas explosion characteristic experiment device in a confined space, which comprises a pipeline system and a gas distribution system, the pipeline system comprises a driving pipe, a visible pipe and a test pipe arranged in sequence, the gas distribution system comprises a vacuum pump, an electric control valve group and a gas cylinder pipeline connected with each electric control valve in the electric control valve group, and the gas distribution system is connected with the driving pipe through a gas inlet. The hydrogen-doped natural gas explosion accident characteristic evolution and inhibition experiment of different hydrogen proportions can be carried out, and important characteristic parameters in the deflagration and detonation flame propagation process of the hydrogen-doped natural gas can be recorded.

The application belongs to the technical field of fireproof and heat-insulating glass, and particularly relates to a fireproof and heat-insulating glass and a preparation process thereof, which comprises assembling frames, a glass body, reinforcing plates and fireproof and heat-insulating sponges, wherein the assembling frames are provided in pairs, the glass body is clamped on the inner walls of the assembling frames, the reinforcing plates are arranged between the two assembling frames and are connected through the reinforcing plates, and the fireproof and heat-insulating sponges are installed on the reinforcing plates; special tempered glass or fireproof glass is selected as a base material, the strength of the glass plate can be maintained at high temperature, the glass plate is subjected to mechanical processing and edge grinding treatment, the safety and compatibility of the component are ensured, the developed fireproof and heat-insulating sponge material has excellent heat-insulating property, can protect the structure from high temperature, adopts a hollow sandwich design to block heat and flame propagation, improves the fireproof performance, forms a closed system preventing smoke penetration through edge sealing and surface reflection coating, effectively reduces heat transfer, and realizes efficient heat insulation.

The invention relates to the technical field of kraft linerboards, in particular to a flame-retardant kraft linerboard and a surface treatment process thereof. An upper transition layer is arranged below the upper surface layer, a core layer located on a middle base layer of the kraft linerboard is arranged below the upper transition layer, a flame-retardant layer for inhibiting combustion reaction and reducing flame propagation speed through a flame retardant is arranged in the core layer, and a lower transition layer is arranged below the core layer. A lower-layer surface layer which is symmetrical with the upper-layer surface layer and is positioned on the outermost layer of the bottom of the kraft linerboard is arranged below the According to the flame-retardant kraft linerboard, a layered composite structure is adopted, the upper transition layer and the lower transition layer are additionally arranged, the binding force between the layers is enhanced, the layering phenomenon is effectively avoided, the overall strength and durability of the kraft linerboard are greatly improved, the flame-retardant layer adopts a multi-layer composite structure and gradient flame-retardant design, and the flame-retardant efficiency is improved; according to the process, the flatness, glossiness and printing stability of the paperboard are ensured, the quality of a finished product is stable, the defective rate is reduced, and the production efficiency and economic benefits are improved.

The application relates to a combustion and explosion risk prediction method and device based on a working condition self-adaptive fractal dimension, and particularly relates to the technical field of combustion and explosion safety. The method comprises the following steps: firstly, acquiring environment monitoring data and space structure data of a closed space; then, determining a flow field working condition in the closed space according to the environment monitoring data and the space structure data, the flow field working condition being used for determining a fractal dimension and a flame acceleration critical radius, the fractal dimension and the flame acceleration critical radius being self-adaptive to the turbulent intensity of the flow field working condition; using an overpressure prediction model to determine a combustion and explosion overpressure prediction result of a combustible mixture in the closed space according to the fractal dimension and the flame acceleration critical radius; and finally, determining a combustion and explosion risk grade corresponding to the closed space according to the combustion and explosion overpressure prediction result. The application can self-adaptively determine the flame propagation characteristics corresponding to the fluid working condition, predict the combustion and explosion overpressure, and further improve the combustion and explosion overpressure prediction accuracy.

The present invention discloses a method for calculating the center of a laminar flame and the flame propagation radius. A flame pattern image is taken under initial experimental conditions, and the image is superimposed with a group of flame pattern images taken after the ignition electrode is rotated by 90° under the same initial experimental conditions. The best flame superposition image is determined, and the initial center of the flame edge contour in the two superimposed flame contour images is calculated. The range of the flame edge contour affected by the ignition electrode is determined, and the flame contour affected by the ignition electrode in another flame contour image is replaced with the edge contour without the influence of the ignition electrode. The center coordinates of the flame in the two flame pattern images after the influence of the ignition electrode is removed and the flame radius at each angle are calculated. The present invention aims at the influence of the ignition electrode on the flame edge contour, and uses the edge contour with high correlation to replace the area affected by the ignition electrode, so as to obtain a better flame edge contour and reasonably calculate the flame center and the flame propagation radius.

A method and apparatus for operating a flare stack pilot with a fuel having a high flame speed includes a structure which is operable to recirculate products of combustion to be mixed with the incoming fuel to dilute the incoming fuel to reduce the flame speed of the resulting mixture.

The application discloses a kind of multi-phase mixture laminar flow flame burning rate measuring device and measuring method, the measuring device includes reaction shell, liquid atomization module, gas supply module, gas-liquid mixing module, rectifier nozzle module, ignition module and optical measurement module, reaction shell has the reaction cavity for gas-liquid mixing;Liquid atomization module is used to gather liquid fuel, and liquid fuel is atomized to form droplet;Gas supply module is used to control the flow and direction of gas into reaction cavity;Gas-liquid mixing module is arranged in reaction cavity, including the flow guide baffle for forming buffer space;Rectifier nozzle module includes rectifier unit and nozzle unit, rectifier unit is used to weaken flow field disturbance, and nozzle unit is used to output gas mist two-phase mixture fluid;Ignition module is used to ignite the gas mist two-phase mixture ejected;Optical measurement module is used to obtain flame propagation data.The measuring device can realize the accurate measurement and analysis of multi-phase mixture combustion process.

The invention relates to an experimental device and method for preventing a quadratic type cloud explosive bomb from fire channeling. The device comprises a cloud explosive bomb main body which is a hollow pipe containing central initiating explosive and cloud explosive fuel, an upper end opening is detachable, and a plurality of notch grooves are distributed in the inner side wall of the cloud explosive bomb main body. The central tube is filled with the porous material, the inert explosion suppression dust is uniformly dispersed in pores of the porous material, and explosion flame propagation of the central initiating explosive is inhibited under the combined action of the porous physical structure and the chemical explosion suppressant, so that the fire channeling phenomenon is prevented. The center initiating explosive is tightly connected with the detonator, and the detonator is fixed through a center initiating detonator plug. And the ignition delay system is used for controlling the initiation time sequence of the central primer detonator and the secondary primer detonator. The method can prevent the fire channeling phenomenon of the cloud explosive bomb, so that the damage power of the cloud explosive bomb is improved, and the method has the advantages of being simple in process, easy to operate, low in cost and suitable for batch production.

The present application relates to a kind of powder starting test device, solve the existing powder starting test bench cannot simulate high altitude low pressure environment, and powder starting test needs to be completed in dependence on whole machine test and on high altitude test stand, lead to test cost is high, research cycle is long and cannot early obtain component performance and flame propagation law Problem.It includes closed box, air pump, air pump, temperature measuring device, flame generator, barometer and multiple groups of cameras;Pressure in closed box is adjusted by air pump and air pump cooperation, simulate different altitude environment;Temperature measuring device can move along horizontal direction, temperature distribution in flame field is inducted by grid-like temperature indicating paint, cooperate multiple groups of cameras to capture flame range and propagation distance, realize the accurate test of the combustion performance of powder starting device under different altitude environment.The present application is compact in structure, convenient to operate, low in test cost, short in cycle, can early obtain key performance data, provide reliable support for the optimization design of powder starting device.