CN114112410A - Rapid heating and boosting device in low-temperature cold start environment - Google Patents
Rapid heating and boosting device in low-temperature cold start environment Download PDFInfo
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- CN114112410A CN114112410A CN202111364232.1A CN202111364232A CN114112410A CN 114112410 A CN114112410 A CN 114112410A CN 202111364232 A CN202111364232 A CN 202111364232A CN 114112410 A CN114112410 A CN 114112410A
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Abstract
The invention provides a rapid heating and boosting device in a low-temperature cold start environment. The constant-volume fuel injection device comprises a constant-volume combustion bomb, a working condition construction system, a fuel supply and injection system, a control unit and an experiment monitoring system which are connected with one another; before fuel injection, a control unit controls a fuel gas bottle in a working condition construction system to fill combustible gas into a constant volume combustion bomb, an ignition electrode in the working condition construction system is controlled to ignite the combustible gas, so that the temperature and the pressure in the constant volume combustion bomb are quickly increased, the temperature and the pressure are slowly reduced, and when an experiment monitoring system monitors that the ambient pressure in the constant volume combustion bomb is reduced to a target pressure, the control unit controls a fuel oil supply and injection system to inject liquid fuel oil into the constant volume combustion bomb from an oil injector. The device can ensure that the fuel supply and injection system works according to the preset fuel injection pressure, fuel injection time and fuel injection pulse width, can ensure that the constant volume combustion bomb and the high-speed photographic system in the spray experiment work in the preset state at the moment, and can simulate the cold start of the engine under the extremely cold condition.
Description
Technical Field
The invention relates to the technical field of cold start of engines, in particular to a rapid heating and boosting device in a low-temperature cold start environment.
Background
At present, in severe cold regions, the problems of flameout, deflagration and the like can be caused when liquid fuel is used due to low combustion heat value, and the working capacity of an engine in severe cold environments is severely limited. Therefore, solving the problem of realizing cold start of the engine in a low-temperature environment is a more urgent research subject in the modern times. In order to study the spray characteristics of liquid fuel under cold start conditions in engines, the mainstream method is to simulate the spray combustion process of liquid fuel in an engine cylinder by using a constant-volume combustion bomb. In addition, under the condition of low-temperature cold start, the processes of spraying, atomizing, evaporating and mixing the liquid fuel with air are key links in the whole combustion process, the good atomizing and mixing processes can obviously improve the combustion efficiency of the liquid fuel in an engine cylinder, and can also reduce the emission of harmful substances in the combustion process of the engine.
The fuel oil spray crushing and the oil-gas mixture forming process are researched in the constant-volume combustion bomb, so that the full mixing of the fuel oil and the environment is enhanced, and the combustion process of the engine is improved. The liquid fuel is sprayed out from the nozzle under the working condition of high temperature and high pressure, and then enters the mixed layer which exceeds the thermodynamic critical of the substance, the surface tension of the mixed layer is gradually reduced, and the mixed layer controlled by diffusion replaces a low-pressure gas-liquid interface. In the existing experiment for researching that liquid fuel oil is sprayed into a constant volume combustion bomb under the supercritical condition, the heating mode of the constant volume combustion bomb is mainly characterized in that a heating furnace or an electric heating block and other heating devices are arranged on the outer wall surface of the constant volume combustion bomb, and N is introduced into the constant volume combustion bomb2And the inert gas provides a high-pressure working environment. And the working environment of the temperature and the pressure required by the fuel injection constant-volume combustion bomb is provided, so that the preheating needs to be carried out for a long time in advance, a large amount of working time is wasted, and the problem of cold start of the engine still cannot be solved.
At present, in the starting process of an engine in the prior art, after a high-temperature and high-pressure working environment is provided from the outside, liquid fuel is injected into a combustion chamber, and in the cold starting process of the engine, the starting work of the engine can be realized only by preheating the ambient temperature to the temperature required by the working, so that the cold starting of the engine cannot be realized in an emergency. The simulation engine in the constant volume combustion bomb also needs to preheat the internal environment of the bomb to the working temperature in advance in the working process, and a heating furnace or a heating block is generally used for heating the constant volume combustion bomb.
The disadvantages of the engine starting process in the prior art described above are: heating the constant-volume combustion bomb to the working temperature takes a long time (generally needs 30 minutes of heating), so that the working efficiency and the working flexibility are limited to a great extent, and the capability of simulating the working condition of the engine by the constant-volume combustion bomb is limited. Meanwhile, the liquid fuel oil which is not sprayed into the constant volume combustion bomb under the required working condition has low combustion efficiency.
Disclosure of Invention
The embodiment of the invention provides a rapid heating and boosting device in a low-temperature cold start environment, which is used for realizing rapid cold start of an engine in the low-temperature environment.
In order to achieve the purpose, the invention adopts the following technical scheme.
A rapid temperature rise and pressure rise device in a low-temperature cold start environment comprises: the constant-volume fuel injection device comprises a constant-volume combustion bomb, a working condition construction system, a fuel supply and injection system, a control unit and an experiment monitoring system which are connected with one another;
before fuel is injected, the control unit controls a combustible gas bottle in the working condition construction system to fill combustible gas into the constant volume combustion bomb, an ignition electrode in the working condition construction system is controlled to ignite the combustible gas, so that the temperature and the pressure in the constant volume combustion bomb are quickly increased, then the temperature and the pressure are slowly reduced, and when the experiment monitoring system monitors that the ambient pressure in the constant volume combustion bomb is reduced to a target pressure, the control unit controls the fuel supply and injection system to inject liquid fuel into the constant volume combustion bomb from a fuel injector.
Preferably, the apparatus further comprises:
and the image acquisition system is used for starting work after receiving the synchronous trigger signal transmitted by the control unit and recording the spraying process of the liquid fuel in real time.
Preferably, the body of the constant volume combustion bomb consists of a cavity and an upper end cover, the cavity is of a hollow structure, the cavity consists of 6 end faces, three end faces of the cavity, namely the front end face, the left end face and the right end face, are respectively provided with 3 quartz glass windows with the same size and structure, the upper end cover is connected to the cavity through a flange, and an oil sprayer, a thermocouple and a high-frequency pressure sensor are arranged on the upper end cover; the back end surface is provided with a spark plug for igniting the pre-burning gas; the lower end surface is provided with an air inlet, an air outlet, a safety valve and a low-frequency pressure sensor;
the environmental temperature and the environmental pressure in the constant-volume combustion bomb are respectively measured by a thermocouple and a low-frequency pressure sensor, the environmental pressure is measured by a high-frequency pressure sensor after ignition is started, and the environmental temperature is calculated according to the temperature measured at the moment of starting ignition and a pressure curve measured by the high-frequency pressure sensor by a mass conservation law and an ideal gas state equation.
Preferably, a safety valve is installed on the constant volume combustion bomb, the threshold value is 6MPa, and a one-way check valve is installed in the combustible gas sampling pipeline.
Preferably, the fuel supply and injection system comprises a high-pressure oil pump and an oil rail, the high-pressure oil pump is driven by a motor, and the high-pressure oil pump is connected with a motor spindle through a coupling and provides rotary power for the oil pump spindle; the shell passes through the flange cover to be connected, and the flange cover is monolithic structure, and integrated rail pressure sensor on the oil rail passes through high-pressure fuel pipe to be connected between high-pressure oil rail and the constant volume burning bullet.
Preferably, the control unit is used for realizing ignition coil drive control, oil pump drive control and rail pressure acquisition, oil injector drive control, light source triggering and high-speed camera triggering functions, and outputting synchronous signals for acquiring the pressure and the temperature of the projectile body.
Preferably, the experiment monitoring system comprises three main passages, namely an oil passage, a light passage and a circuit, wherein the oil passage comprises a low-pressure oil passage and a high-pressure oil passage, the high-pressure oil pump is used as a boundary, the low-pressure oil passage refers to the condition that liquid fuel oil comes out of an oil tank, is subjected to coarse filtration by a coarse filter and then enters a fine filter for fine filtration, and the high-pressure oil passage is formed by the way that the high-pressure fuel oil comes out of the high-pressure oil pump, enters a high-pressure oil rail, passes through the high-pressure oil rail and enters an oil injector, and then is injected into a constant-volume combustion bomb;
the optical path is sent by the highlight light source, shine the lens of schlieren device, through constant volume burning bullet inner space, carry spraying process information and get into high-speed camera, get off by the recording of sensitization light source, high-speed camera converts light signal into the signal of telecommunication, form the digital image, and the storage is in image acquisition computer, the circuit leads all the control unit's hardware equipment, carry out human-computer interaction through the circuit and then control the process of experiment, the sensor sends the measured quantity signal uninterruptedly, the experimenter masters the experiment process through the monitored control system interface, issue the experiment instruction.
The technical scheme provided by the embodiment of the invention can ensure that the fuel supply and injection system works according to the preset fuel injection pressure, fuel injection time and fuel injection pulse width, and can ensure that the spray experiment constant volume combustion bomb and the high-speed photographic system work in the preset state at the moment, thereby realizing cold start of the engine in emergency.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a structural diagram of a spray simulation experiment apparatus according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a constant volume bomb according to an embodiment of the present invention;
FIG. 3 is a three-dimensional view of a constant volume burner bomb in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of a pressure change condition in the constant volume bomb according to the embodiment of the present invention.
FIG. 5 is a schematic structural diagram of a high-pressure oil pump and an oil rail according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a driving signal of a high pressure common rail oil pump according to an embodiment of the present invention;
fig. 7 is a schematic operation diagram of a constant volume spray simulation experiment system provided in an embodiment of the present invention;
in the figure, 1-oil tank, 2-coarse filter, 3-gear oil pump, 4-fine filter, 5-in-line plunger pump, 6-fuel metering valve, 7-coupler, 8-three-phase alternating current motor, 9-oil rail, 10-rail pressure sensor, 11-oil rail pressure limiting valve, 12-oil injector, 13-constant volume combustion bomb, 14-pressure sensor, 15-temperature sensor, 16-light source, 17-slit, 18-plane mirror, 19-concave mirror, 20-knife edge, 21-high speed camera, 22-image acquisition computer, 23-hydrogen cylinder, 24-oxygen cylinder, 25-pressure reducing valve, 26-light needle valve, 27-experimental system control unit, and 28-experimental control computer.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The embodiment of the invention mainly solves the problems that the cold start of the engine can not be realized under the emergency condition in the using process of the engine, and the fuel spray can not be sufficiently mixed with air, so that the combustion efficiency is low. Before fuel oil is injected into the constant volume combustion bomb, sequentially filling CO into the constant volume combustion bomb2、H2And O2Igniting H2The high-temperature high-pressure working environment is quickly built in the constant-volume combustion bomb, so that the cold start problem of the engine under emergency is solved, and the liquid fuel oil spray combustion efficiency in the actual work of the engine is improved.
Fig. 1 is a structural diagram of a spray simulation experiment apparatus according to an embodiment of the present invention. The device is a set of experimental device which faces research requirements, has complete functions and stable performance. The method comprises the following steps: the device comprises a constant volume combustion bomb, a working condition construction system, a fuel supply and injection system, an image acquisition system, a control unit and an experiment monitoring system. Each subsystem includes different laboratory instruments and equipment. Before fuel is injected, the control unit controls a combustible gas bottle in the working condition construction system to fill combustible gas into the constant volume combustion bomb, an ignition electrode in the working condition construction system is controlled to ignite the combustible gas, so that the temperature and the pressure in the constant volume combustion bomb are rapidly increased, then the temperature and the pressure are slowly reduced, and when the experiment monitoring system monitors that the ambient pressure in the constant volume combustion bomb is reduced to a target pressure, the control unit controls the fuel supply and injection system to inject liquid fuel into the constant volume combustion bomb from a fuel injector.
The three-dimensional schematic view of the constant volume combustion bomb provided by the embodiment of the invention is shown in fig. 2, and the three-dimensional view is shown in fig. 3. The constant volume burning bullet is square structure, and the body of constant volume burning bullet comprises cavity and upper end cover, and the cavity passes through machining and forms hollow structure, and the cavity comprises 6 terminal surfaces, is equipped with the same quartz glass window of 3 size structures respectively at its preceding, left and right three terminal surfaces. The upper end cover is connected to the cavity through a flange, and an oil sprayer, a thermocouple and a high-frequency pressure sensor are arranged on the upper end cover; quartz windows are arranged on the left side, the right side and the front end face of the cavity; the back end surface is provided with a spark plug for igniting the pre-burning gas; the lower end surface is provided with an air inlet, an air outlet, a safety valve and a low-frequency pressure sensor. The ambient temperature and the ambient pressure in the constant volume combustion bomb are respectively measured by a thermocouple and a low-frequency pressure sensor, the ambient pressure is measured by a high-frequency pressure sensor after ignition is started, and the ambient temperature is calculated according to the temperature measured at the moment of starting ignition and a pressure curve measured by the high-frequency pressure sensor by a mass conservation law and an ideal gas state equation.
A safety valve is arranged on the constant volume combustion bomb, the threshold value is 6MPa, and danger caused by overhigh pressure is prevented. Meanwhile, a one-way check valve is arranged in the combustible gas sample introduction pipeline, so that high-temperature combustible gas after ignition is prevented from flowing backwards under the action of high pressure in the constant-volume combustion bomb to enter the pressure reducing valve and flame flows back along the gas inlet pipeline to cause explosion of the combustible gas cylinder.
Sequentially filling CO into constant volume combustion bomb before fuel injection2、H2And O2To reduce O after combustion2Residue of (2), H during experimental aeration2And O2According to the following ratio of 2.1: 1 molar ratio was charged to the bomb. Using projectilesOne side spark plug igniting H2The temperature and the pressure in the constant volume combustion bomb are rapidly increased, the pressure in the constant volume combustion bomb slowly decreases after reaching a peak value due to heat transfer of the wall surface, when the environmental pressure decreases to a target pressure, the pressure feedback system triggers the fuel injection system and the high-speed camera, and the liquid fuel is injected into the constant volume combustion bomb from the fuel injector. The pressure change in the constant volume bomb is shown in fig. 4.
The fuel supply and injection system is composed of a high-pressure oil pump and an oil rail, and fig. 5 is a schematic structural diagram of the high-pressure oil pump and the oil rail provided by the embodiment of the invention. The high-pressure oil pump is directly driven by the motor and is connected with the motor spindle through a coupler to provide rotary power for the oil pump spindle; the shell is connected through the flange sleeve, and the flange sleeve is monolithic structure, can ensure that motor and oil pump centering are accurate, the structure is firm. The rail pressure sensor is integrated on the oil rail, the rail pressure sensor is acquired by the driving controller of the oil supply system, the closed-loop control is carried out on the oil rail pressure, and the pressure range is continuously adjustable within 0-1800 bar. High-pressure fuel oil needs to be transmitted to an oil sprayer mounted on the constant volume combustion bomb from a high-pressure oil rail, and the high-pressure oil rail is connected with the constant volume combustion bomb through a high-pressure oil pipe.
The image acquisition system records the fuel oil spraying process image through the synchronous trigger signal. Before spraying, a thermocouple and a low-frequency pressure sensor are used for measuring the ambient temperature and the ambient pressure in the constant-volume combustion bomb, and H is filled in the constant-volume combustion bomb2And then measuring the ambient pressure by using a high-frequency pressure sensor, and calculating the ambient temperature according to a mass conservation law and an ideal gas state equation by using the temperature measured at the moment of ignition and the pressure measured by the pressure sensor. Therefore, a corresponding working environment in a low-temperature cold start state can be created according to the temperature and the pressure required by the experiment.
The control unit is used for synchronously controlling the collectors. The control unit integrates the functions of ignition coil drive control, oil pump drive control, rail pressure acquisition, oil injector drive control, light source triggering, high-speed camera triggering and the like, and can also acquire 8-channel synchronous signals for acquiring the pressure and temperature of the projectile body.
(1) And (5) driving and controlling an ignition coil. In order to realize the low-temperature oil injection working condition in the combustion chamber during cold start, the pressure of 22bar and the temperature of 300 ℃ in the elastomer of the constant-volume combustion bomb are required to be achieved before oil injection, and the oil injector is required to keep low temperature, so the test scheme is to charge hydrogen and oxygen into the constant-volume combustion bomb, ignite the hydrogen and the oxygen before oil injection, and quickly provide a high-temperature and high-pressure working environment required by fuel injection. Therefore, a control unit is required to realize the control function of the ignition coil.
(2) Oil pump drive control and rail pressure collection. The high-pressure common rail oil pump needs to provide driving current, the opening of the control valve is changed by controlling the driving current, the oil inlet amount of the oil rail is adjusted, and the pressure of the oil rail is further changed. Fig. 6 is a schematic diagram of a driving signal of the high-pressure common rail oil pump according to an embodiment of the present invention, in which a controller adjusts a current of a control valve in a PWM (Pulse Width Modulation) manner, a typical frequency of the PWM is 120Hz, 20-200Hz is adjustable, and a duty ratio is 0-100% adjustable.
(3) And driving and controlling the oil injector. Two-channel oil-jet drive is provided, one channel is normally jetted, and the other channel triggers single-cycle jetting.
(4) Light source and high speed camera triggering.
(5) And (5) acquiring a synchronous signal.
The experiment monitoring system mainly uses a computer and different functional software to observe and record the experiment working condition in real time. And further carrying out experimental tests of other working systems.
Fig. 7 is a schematic operation diagram of a constant volume spray simulation experiment system provided by an embodiment of the present invention. The experimental monitoring system can be divided into three main passages, namely oil passages, light passages and circuits according to working media, wherein the oil passages are mainly 9, 10, 11, 2, 3, 4, 5, 6, 7 and 8 in the figure 7, the light passages are mainly 16, 17, 18, 19, 13, 14, 15, 20 and 21 in the figure 7, and the circuits are mainly 28, 27, 21, 8 and 11 in the figure 7.
The experiment monitoring system integrates scattered experiment equipment. Each path has own function, and the three paths must work simultaneously and be accurately controlled to achieve the purpose of experiment. The following description is made in conjunction with a schematic operation diagram (fig. 7) of a volumetric spray simulation experiment system. The oil circuit mainly comprises a low-pressure oil circuit and a high-pressure oil circuit, and the high-pressure oil pump is used as a boundary. The low-pressure oil way refers to that liquid fuel oil flows out of the oil tank, enters a coarse filter for coarse filtration and then enters a fine filter for fine filtration. The high-pressure oil way is formed by that after the high-pressure oil pump is used for discharging high-pressure fuel oil, the high-pressure fuel oil enters a high-pressure oil rail, passes through the high-pressure oil rail to reach an oil sprayer, and finally is sprayed into a constant-volume combustion bomb. The low-pressure oil circuit provides liquid fuel oil to the high-pressure oil pump through the oil pipe to be compressed into high-pressure fuel oil, and then the high-pressure fuel oil is injected into the fixed-volume combustion bomb to finish the injection process. The light path is sent out by the strong light source and carries the information of the spraying process through the schlieren system to enter the high-speed camera. The light path refers to the path traveled by light emitted by a source of intense light. The schlieren instrument uses the light path to take a picture. The light path is emitted by a strong light source. The lens of the schlieren device is irradiated, passes through the inner space of the constant volume combustion bomb, carries the spraying process information to enter the high-speed camera, and is recorded by the photosensitive light source. The high-speed camera converts the optical signal into an electric signal, and finally forms a digital image to be stored in the image acquisition computer. The circuit leads hardware equipment of all control units, and human-computer interaction is carried out through the circuit so as to control the experimental process. In the experimental system, a high-pressure oil pump, an oil sprayer, a high-speed camera and a temperature control system are controlled objects, a sensor uninterruptedly sends out measured signals, an experimenter grasps an experimental process and issues an experimental instruction through a monitoring system interface, and the processes are all realized in an electric signal mode.
The high-speed camera converts the optical signal into an electric signal to form a digital image which is stored in the computer. The circuit controls all hardware devices, and the sensor sends out a measuring signal to operate all the devices.
In summary, the device provided by the embodiment of the invention can ensure that the fuel supply and injection system works according to the preset fuel injection pressure, fuel injection time and fuel injection pulse width, and can ensure that the spray experiment constant volume combustion bomb and the high-speed photography system work in the preset state. The image acquisition system records the liquid fuel spraying process in time through synchronous trigger signals.
The experimental device is characterized in that CO is filled in a constant-volume combustion bomb2、H2And O2Igniting combustible gas by spark plugH2The constant volume combustion bomb can quickly form a high-temperature and high-pressure working environment, so that the cold start problem is solved. Due to the utilization of combustible gas H2The combustion of building high temperature high pressure operational environment need not close preheating device such as heating plate, and easy operation consequently can form the required operational environment of fuel injection fast and do not have other energy consumptions, changes traditional engine cold start technique, has built brand-new engine cold start work background, consequently can realize the cold start of engine under emergency.
The device provided by the embodiment of the invention can simulate the actual conditions of spraying, atomizing and evaporating the liquid fuel and mixing the liquid fuel with air in actual work, improve the combustion efficiency of the liquid fuel and reduce the emission of harmful substances in the combustion process. The operation is simple, the working efficiency is high and no other pollutants are discharged in the cold starting process. The problem of cold start of the engine under emergency is solved, and the development of a novel engine to a green and non-toxic direction is promoted.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides a rapid heating up under low temperature cold start environment steps up device which characterized in that includes: the constant-volume fuel injection device comprises a constant-volume combustion bomb, a working condition construction system, a fuel supply and injection system, a control unit and an experiment monitoring system which are connected with one another;
before fuel is injected, the control unit controls a combustible gas bottle in the working condition construction system to fill combustible gas into the constant volume combustion bomb, an ignition electrode in the working condition construction system is controlled to ignite the combustible gas, so that the temperature and the pressure in the constant volume combustion bomb are quickly increased, then the temperature and the pressure are slowly reduced, and when the experiment monitoring system monitors that the ambient pressure in the constant volume combustion bomb is reduced to a target pressure, the control unit controls the fuel supply and injection system to inject liquid fuel into the constant volume combustion bomb from a fuel injector.
2. The apparatus of claim 1, further comprising:
and the image acquisition system is used for starting work after receiving the synchronous trigger signal transmitted by the control unit and recording the spraying process of the liquid fuel in real time.
3. The device according to claim 1 or 2, wherein the body of the constant volume combustion bomb consists of a cavity and an upper end cover, the cavity is of a hollow structure and consists of 6 end faces, 3 quartz glass windows with the same size and structure are respectively arranged on the front end face, the left end face and the right end face of the cavity, the upper end cover is connected to the cavity through a flange, and a fuel injector, a thermocouple and a high-frequency pressure sensor are arranged on the upper end cover; the back end surface is provided with a spark plug for igniting the pre-burning gas; the lower end surface is provided with an air inlet, an air outlet, a safety valve and a low-frequency pressure sensor;
the environmental temperature and the environmental pressure in the constant-volume combustion bomb are respectively measured by a thermocouple and a low-frequency pressure sensor, the environmental pressure is measured by a high-frequency pressure sensor after ignition is started, and the environmental temperature is calculated according to the temperature measured at the moment of starting ignition and a pressure curve measured by the high-frequency pressure sensor by a mass conservation law and an ideal gas state equation.
4. The device of claim 3, wherein a safety valve is arranged on the constant volume bomb, the threshold value is 6MPa, and a one-way check valve is arranged in the combustible gas sampling pipeline.
5. The device of claim 1 or 2, wherein the fuel supply and injection system comprises a high-pressure oil pump and an oil rail, the high-pressure oil pump is driven by a motor, and the high-pressure oil pump is connected with a motor spindle through a coupling and provides rotary power for the oil pump spindle; the shell passes through the flange cover to be connected, and the flange cover is monolithic structure, and integrated rail pressure sensor on the oil rail passes through high-pressure fuel pipe to be connected between high-pressure oil rail and the constant volume burning bullet.
6. The device according to claim 1 or 2, wherein the control unit is used for realizing ignition coil drive control, oil pump drive control and rail pressure acquisition, fuel injector drive control, light source triggering and high-speed camera triggering functions and outputting synchronous signals of elastomer pressure and temperature acquisition.
7. The device according to claim 1 or 2, wherein the experiment monitoring system comprises three main passages, namely an oil passage, an optical passage and a circuit, the oil passage comprises a low-pressure oil passage and a high-pressure oil passage, the high-pressure oil pump is used as a boundary, the low-pressure oil passage refers to the condition that liquid fuel oil flows out of an oil tank, coarse filtration is carried out on the liquid fuel oil through a coarse filter, then fine filtration is carried out on the liquid fuel oil through a fine filter, and after the high-pressure oil passage flows out of the high-pressure oil pump, the high-pressure fuel oil enters a high-pressure oil rail, and then enters an oil injector through the high-pressure oil rail to be injected into a constant-volume combustion bomb;
the optical path is sent by the highlight light source, shine the lens of schlieren device, through constant volume burning bullet inner space, carry spraying process information and get into high-speed camera, get off by the recording of sensitization light source, high-speed camera converts light signal into the signal of telecommunication, form the digital image, and the storage is in image acquisition computer, the circuit leads all the control unit's hardware equipment, carry out human-computer interaction through the circuit and then control the process of experiment, the sensor sends the measured quantity signal uninterruptedly, the experimenter masters the experiment process through the monitored control system interface, issue the experiment instruction.
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| CN115014773A (en) * | 2022-06-07 | 2022-09-06 | 哈尔滨工程大学 | Constant volume combustion bomb control system, control method, equipment and medium based on LabVIEW |
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