CN111521404B - Device and method for researching formation and inhibition of in-cylinder detonation under detonation of internal combustion engine - Google Patents
Device and method for researching formation and inhibition of in-cylinder detonation under detonation of internal combustion engine Download PDFInfo
- Publication number
- CN111521404B CN111521404B CN202010510817.9A CN202010510817A CN111521404B CN 111521404 B CN111521404 B CN 111521404B CN 202010510817 A CN202010510817 A CN 202010510817A CN 111521404 B CN111521404 B CN 111521404B
- Authority
- CN
- China
- Prior art keywords
- detonation
- stop valve
- cylinder
- variable structure
- wall surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/08—Testing internal-combustion engines by monitoring pressure in cylinders
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
Abstract
The invention discloses a device and a method for researching formation and inhibition of in-cylinder detonation under the detonation of an internal combustion engine. The device comprises a detonation volume bomb body, an adjustable high-energy ignition system, a cylinder pressure synchronous acquisition system and a gas distribution table. The detonation volume bomb body consists of a variable structure cylinder cover, a variable thickness bushing and a piston, wherein the piston consists of a variable structure wall surface and a sensor mounting wall. The invention ignites a deflagration wave in the cylinder through the high-energy igniter, and then monitors the process of converting the deflagration in the cylinder into the detonation through the synchronous cylinder pressure acquisition system and the smoke film; the influence of different combustion chamber geometric shapes on the detonation wave forming process is researched by changing the cylinder cover structure, the thickness of the lining and the shape of the piston; the inhibition effect of different sound absorption porous parameters on the detonation to detonation is researched by changing the sound absorption porous parameters on the variable wall surface structure of the piston.
Description
Technical Field
The invention belongs to the technical field of engine detonation research, and particularly relates to a device and a method for researching formation and inhibition of in-cylinder detonation under the detonation of an internal combustion engine.
Background
In recent years, as petroleum resources are increasingly strained, the demand for further improvement in thermal efficiency of internal combustion engines is becoming more urgent. According to the thermodynamic principle, the compression ratio is directly related to the thermal efficiency of the engine, and the higher the compression ratio, the higher the thermal efficiency of the engine. However, further strengthening of compression results in a new Knock phenomenon known as "Super Knock" (Super Knock). Unlike conventional detonation, which is a mild auto-ignition or deflagration of the terminal mixture, the occurrence of "super-detonation" is often accompanied by the formation of detonation waves of the terminal mixture. Once formed, the in-cylinder pressure oscillations tend to exceed 30MPa in magnitude, much higher than conventional detonation. The high-frequency high-amplitude pressure oscillation can destroy and lose the parts of the combustion chamber in a short time, so that the engine cannot continuously work, and great obstacles are brought to further energy conservation and emission reduction of the engine.
Therefore, how to avoid the super knock caused by the improvement of the thermal efficiency is a key problem to be solved in the field of internal combustion engines. To avoid "super-detonation", the formation of detonation waves is suppressed under thermodynamic conditions in the cylinder of the internal combustion engine. Under the working condition of 'super knock', an actual engine is influenced by various operating factors, and the phenomenon of 'super knock' can be randomly generated once after a plurality of cycles are often separated, which brings uncontrollable factors for researching 'super knock'. On the other hand, during the operation of the engine, the piston performs a high-speed reciprocating motion, which hinders the safe and reliable arrangement of the pressure sensor on the piston, thereby making it extremely difficult to obtain the formation process of the cylinder detonation wave. Finally, changing the geometric structure and the wall surface structure of the combustion chamber on the actual engine requires higher processing cost and matching requirements, which is not beneficial to quickly develop the research on the formation and inhibition of the cylinder internal detonation waves by different geometric structures and wall surface structures of the combustion chamber. In view of the fact that the bench test of the internal combustion engine is influenced by various operation factors, the acquired super detonation is random, so that multiple uncontrollable factors are brought to the research on the super detonation, and the research on the formation and inhibition of the super detonation is not facilitated by controlling a single variable; the destructive nature of the super detonation makes the engine bench test costly and time consuming.
Disclosure of Invention
The invention aims to provide a device and a method for researching formation and inhibition of in-cylinder detonation under the detonation of an internal combustion engine. In the detonation volume bomb, the detonation wave is ignited by high-energy ignition, so that the process of converting detonation into detonation in the cylinder can be stably and controllably reproduced; a plurality of pressure sensors are conveniently arranged at different positions, so that the forming process of detonation waves is captured comprehensively; by changing the variable structure cylinder cover, the variable thickness bushing and the variable structure wall surface of the piston, the geometric shape and the wall surface structure of the combustion chamber can be conveniently and rapidly changed, so that the influence and the effect of different geometric shapes and wall surface structures on the formation and the inhibition of the detonation waves in the cylinder are researched.
The technical scheme for realizing the aim of the invention is as follows:
the utility model provides a device for studying internal-cylinder detonation forms and suppresses under internal-combustion engine detonation, holds bullet body and gas distribution platform including the detonation, the detonation holds bullet body and includes varistructure cylinder cap, variable thickness neck bush, varistructure wall, bullet periphery, high energy spark plug, at least one cylinder pressure sensor, advances exhaust aperture, advances the blast pipe, bullet periphery cover is located outside between varistructure cylinder cap and the varistructure wall, the variable thickness neck bush set up in bullet periphery inboard just two terminal surfaces of variable thickness neck bush respectively with varistructure cylinder cap and two relative end face contacts of varistructure wall, form the combustion chamber space between varistructure cylinder cap and the varistructure wall, high energy spark plug stretches into in the combustion chamber space, at least one cylinder pressure sensor is used for detecting pressure in the combustion chamber space, the combustion chamber space is communicated with the gas distribution table through the gas inlet and outlet holes and the gas inlet and outlet pipes.
Further, the detonation containing bomb body further comprises a variable thickness outer bushing and a sensor mounting wall, the variable thickness outer bushing is located between the end face of the periphery of the bomb body and the end face of the variable structure cylinder cover, and the sensor mounting wall is located on the outer side of the wall face of the variable structure.
And furthermore, the device also comprises a plurality of groups of bolts, and the plurality of groups of bolts sequentially pass through the variable structure cylinder cover, the variable thickness outer bushing, the periphery of the projectile body, the wall surface of the variable structure and the mounting wall of the sensor.
Furthermore, the air inlet and outlet small hole is formed in the wall surface of the variable structure, and the air inlet and outlet pipe penetrates through the sensor mounting wall and is connected with the air inlet and outlet small hole.
The high-energy spark plug sealing ring is arranged between the periphery of the elastomer and the wall surface of the variable structure.
The high-energy ignition system is connected with the adjustable high-energy ignition system, and the adjustable high-energy ignition system is used for adjusting the ignition energy of the high-energy ignition plug.
Further, the gas distribution table comprises a five-way cavity, a vacuum pump stop valve, an ambient air stop valve, a reducing agent reducing valve, a reducing agent storage tank, an oxidant stop valve, an oxidant reducing valve, an oxidant storage tank, a bomb-containing stop valve, an absolute pressure gauge and a vacuum pump, wherein one end of the bomb-containing stop valve is connected with the five-way cavity, the other end of the bomb-containing stop valve is connected with an air inlet and outlet pipe, the absolute pressure gauge is used for measuring the pressure in the five-way cavity, the vacuum pump is connected with the five-way cavity through the vacuum pump stop valve, the oxidant storage tank is connected with the five-way cavity through the oxidant reducing valve and the oxidant stop valve, and the reducing agent storage tank is connected with the five-way cavity through the reducing agent reducing valve and the reducing agent stop valve.
Further, the sound absorption porous medium with the inner wall surface of the wall surface with the variable structure has different parameters or the inner wall surface of the wall surface with the variable structure is provided with a pressure relief pit.
A method for researching formation and inhibition of in-cylinder detonation under detonation of an internal combustion engine by adopting the device comprises the following steps:
s1, sticking a smoked smoke film on the inner side wall surface of a variable structure cylinder cover and the inner side wall surface of the variable structure cylinder cover or directly using a lead foil, and recording a cell image in a detonation wave forming process;
s2, adjusting ignition energy in the adjustable high-energy ignition system to enable the ignition energy to be lower than critical detonation energy of mixed gas used in an experiment, so that the high-energy spark plug can only ignite detonation waves and cannot directly form the detonation waves;
s3, calculating partial pressures of the reducing agent and the oxidizing agent according to the initial total pressure and the equivalence ratio of the gas required by the experiment, and preparing to start the experiment;
s4, starting a vacuum pump of the gas distribution table, starting a vacuum pump stop valve and a bomb containing stop valve, vacuumizing gas in the detonation bomb containing body, observing an absolute pressure gauge, reducing the indication number to be within 1kPa, and closing the vacuum pump stop valve;
s5, slowly opening an oxidant stop valve to enable oxidant to slowly enter the detonation cartridge body through the five-way cavity, observing the indication of an absolute pressure gauge, rapidly and sequentially closing the cartridge containing stop valve and the oxidant stop valve after the specified partial pressure calculated in the step S3 is reached, then opening a vacuum pump stop valve, pumping residual oxidant in the gas distribution table to vacuum, observing the absolute pressure gauge, reducing the indication to be within 1kPa, and closing the vacuum pump stop valve;
s6, slowly opening a reducing agent stop valve to enable a reducing agent to slowly enter the detonation cartridge containing body through the five-way cavity, observing the indication number of an absolute pressure gauge, rapidly and sequentially closing the cartridge containing stop valve and the reducing agent stop valve after the specified partial pressure calculated in the step S3 is reached, then opening a vacuum pump stop valve, pumping residual reducing agent in the gas distribution table to vacuum, observing the absolute pressure gauge, reducing the indication number to be within 1kPa, and closing the vacuum pump stop valve;
s7, after modulating a to-be-triggered state by the cylinder pressure synchronous acquisition system, starting the high-energy ignition system to realize single ignition, forming deflagration waves at the position of a high-energy spark plug after ignition, and triggering the cylinder pressure synchronous acquisition system to synchronously acquire and store a plurality of cylinder pressure sensors after the cylinder pressure sensors receive pressure pulse signals;
s8, opening a bomb-containing stop valve and a vacuum pump stop valve in sequence, vacuumizing a combustion product in the detonation bomb-containing body, observing an absolute pressure gauge, reducing the reading to be within 1kPa, closing the vacuum pump stop valve, opening an ambient air stop valve, enabling the atmosphere to enter a gas distribution table and the detonation bomb-containing body, realizing pressure balance, extracting a sensor mounting wall and the wall surface of a variable structure integrally, taking out a lead foil or a smoke film in the combustion chamber, and recording cell marks or cell patterns;
s9, in different comparison experiments, a pair of variable-thickness inner bushings, variable-thickness outer bushings and/or variable-structure wall surfaces of different hole structures or different-structure pressure relief pits in different geometric shapes and/or different thicknesses of variable-structure cylinder covers and/or high-energy spark plugs in different geometric shapes are replaced, the influence of different high-energy spark plugs on detonation wave formation and suppression under the super detonation working condition of the internal combustion engine at different ignition positions, different combustion chamber geometric shapes and different wall surface structures is researched, in different comparison experiments, repeated experiments are carried out according to the steps S1-S8 to verify the consistency and reliability of rules, wherein the rules comprise detonation wave initiation or failure rules.
Further, the different pore structures in step S9 include different pore coverage, different porosity, different pore diameters, different pore depths, and different pore angles.
Compared with the prior art, the invention has the following remarkable advantages:
(1) the invention can stably ignite a deflagration wave with consistent and adjustable intensity by the ignition plug with adjustable energy and high energy, and can stably generate the phenomenon of deflagration to detonation at the tail end of a detonation capacitor bomb, thereby stably forming the phenomenon of 'super detonation', providing a stable experimental platform for the research of the formation and inhibition of the deflagration wave in 'super detonation', and obtaining a large number of 'super detonation' samples with different intensities;
(2) the variable structure cylinder cover, the variable thickness inner bushing and the variable structure wall surface related to the experimental device provided by the invention enable the shape of a combustion chamber, the ignition position of a spark plug and the wall surface structure of an engine to be changed and replaced simply and quickly, so that the formation and inhibition of 'super detonation' can be researched by rapidly and effectively controlling a single variable;
(3) the experimental device and the method provided by the invention can be used for testing the combination of various fuels and oxidants, have strong universality and are beneficial to realizing the anti-knock research of the combination of various fuels and oxidants;
(4) according to the experimental device and the experimental method, the plurality of sensors are arranged at different positions in the combustion chamber, and synchronous trigger acquisition can comprehensively capture the detonation wave forming process or the failure process;
(5) according to the experimental device and the experimental method, the smoke film is pasted on the inner wall surface of the combustion chamber, so that the cell structure during detonation wave formation can be captured finely;
(6) the experimental device and the experimental method provided by the invention have the advantages of high mechanical strength, low processing cost and low experimental cost.
Drawings
FIG. 1 is a schematic structural diagram of a detonation volume bomb body according to the present invention.
Fig. 2 is a schematic view of the gas distribution table of the present invention.
FIG. 3 is a schematic diagram of the porous structure of a common control group with variable structure walls.
FIG. 4 is a schematic diagram of a porous structure with a variable structure having greater wall coverage.
FIG. 5 is a schematic of a porous structure with variable structure wall holes of greater diameter.
FIG. 6 is a schematic diagram of a porous structure with variable structure walls of different shapes.
FIG. 7 is a schematic diagram of a variable structure wall with pressure relief pits.
Detailed Description
The technical content of the invention is explained in detail below by way of example and with reference to the attached drawings:
with reference to fig. 1-2, a device for studying formation and suppression of detonation in a cylinder under detonation of an internal combustion engine comprises a detonation volume bomb body 1 and a gas distribution table 2, wherein the detonation volume bomb body 1 comprises a variable structure cylinder cover 1-1, a variable thickness inner bushing 1-3, a variable structure wall surface 1-5, a bomb periphery 1-7, a high-energy spark plug 1-9, at least one cylinder pressure sensor 1-11, an air inlet and outlet small hole 1-12 and an air inlet and outlet pipe 1-13, the bomb periphery 1-7 is sleeved outside the variable structure cylinder cover 1-1 and the variable structure wall surface 1-5, the variable thickness inner bushing 1-3 is arranged inside the bomb periphery 1-7, and two end surfaces of the variable thickness inner bushing 1-3 are respectively in contact with two end surfaces of the variable structure cylinder cover 1-1 and the variable structure wall surface 1-5, a combustion chamber space is formed between the variable structure cylinder cover 1-1 and the variable structure wall surface 1-5, the high-energy spark plug 1-9 extends into the combustion chamber space, the at least one cylinder pressure sensor 1-11 is used for detecting the pressure in the combustion chamber space, and the combustion chamber space is communicated with the gas distribution table 2 through the gas inlet and outlet small holes 1-12 and the gas inlet and outlet pipes 1-13.
Preferably, the detonation volume bomb body 1 further comprises variable thickness outer bushes 1-4 and sensor mounting walls 1-6, wherein the variable thickness outer bushes 1-4 are located between the end face of the bomb body periphery 1-7 and the end face of the variable structure cylinder cover 1-1, and the sensor mounting walls 1-6 are located on the outer sides of the variable structure wall faces 1-5.
Preferably, the variable structure cylinder cover further comprises a plurality of groups of bolts 1-14, and the plurality of groups of bolts 1-14 are sequentially arranged through the variable structure cylinder cover 1-1, the variable thickness outer bushing 1-4, the elastomer periphery 1-7, the variable structure wall surface 1-5 and the sensor mounting wall 1-6.
Preferably, the air inlet and outlet holes 1-12 are opened on the wall surface 1-5 of the variable structure, and the air inlet and outlet pipe 1-13 passes through the sensor mounting wall 1-6 to be connected with the air inlet and outlet holes 1-12.
Preferably, the cylinder cover sealing ring device further comprises a cylinder cover sealing ring 1-2, an elastomer peripheral sealing ring 1-8 and a high-energy spark plug sealing ring 1-10, wherein the cylinder cover sealing ring 1-2 is arranged between the periphery 1-7 of the elastomer and the variable structure cylinder cover 1-1, the elastomer peripheral sealing ring 1-8 is arranged between the periphery 1-7 of the elastomer and the variable structure wall surface 1-5, and the high-energy spark plug sealing ring 1-10 is arranged between the high-energy spark plug 1-9 and the variable structure cylinder cover 1-1.
Preferably, the high-energy spark plug device further comprises an adjustable high-energy ignition system, wherein the high-energy spark plugs 1-9 are connected with the adjustable high-energy ignition system, and the adjustable high-energy ignition system is used for adjusting the ignition energy of the high-energy spark plugs 1-9. Through the adjustable high-energy ignition system, the single ignition energy of the high-energy spark plug can be lower than the critical detonation energy of the mixed gas used in the experiment, so that the high-energy spark plug can only ignite detonation waves and cannot directly form the detonation waves. The adjustable high-energy ignition system can generate detonation waves with consistent and adjustable strength, and can stably generate the phenomenon of converting detonation into detonation at the tail end of the detonation capacitor bomb, so that the phenomenon of 'super detonation' is stably formed. The intensity of deflagration waves can be adjusted by adjusting the single ignition energy of the high-energy spark plug, so that detonation waves with different intensities are initiated at the tail end of the combustion chamber, namely 'super detonation' with different intensities, and the detonation waves are used for researching the formation and inhibition of the detonation waves in the cylinder. The adjustable high-energy ignition system comprises electronic components such as an adjustable transformer, a plurality of energy storage capacitors, an arc trigger, a control circuit board and the like, wherein the adjustable transformer can realize that the kilovolt-level voltage U is adjustable, the energy storage capacitors can be used in a grading manner, so that the capacitance C is variable, and the capacitance energy storage formula E is 1/2CU2It can be known that the discharge energy of the igniter can be changed by changing the voltage U and the capacitor C, so that the discharge energy can be adjusted.
Preferably, with reference to fig. 2, the gas distribution table 2 includes a five-way cavity 2-1, a vacuum pump stop valve 2-2, an ambient air stop valve 2-3, a reducing agent stop valve 2-4, a reducing agent pressure reducing valve 2-5, a reducing agent storage tank 2-6, an oxidant stop valve 2-7, an oxidant pressure reducing valve 2-8, an oxidant storage tank 2-9, a bomb-containing stop valve 2-10, an absolute pressure gauge 2-11, and a vacuum pump 2-12, one end of the bomb-containing stop valve 2-10 is connected with the five-way cavity 2-1, the other end is connected with an air inlet and outlet pipe 1-13, the absolute pressure gauge 2-11 is used for measuring the pressure in the five-way cavity 2-1, the vacuum pump 2-12 is connected with the five-way cavity 2-1 through the vacuum pump stop valve 2-2, the oxidant storage tank 2-9 is connected with the five-way cavity 2-1 through an oxidant reducing valve 2-8 and an oxidant stop valve 2-7, and the reducing agent storage tank 2-6 is connected with the five-way cavity 2-1 through a reducing agent reducing valve 2-5 and a reducing agent stop valve 2-4.
Preferably, the sound absorption porous medium with different parameters on the inner wall surfaces of the variable structure wall surfaces 1-5 is used for inhibiting 'super detonation', and the partial structure diagrams of the sound absorption porous medium with different parameters are illustrated in figures 3-6. Wherein fig. 3 is a porous structure of a general control group, fig. 4 is a porous structure with a larger coverage, fig. 5 is a porous structure with a larger pore diameter, and fig. 6 is a porous structure with a different shape.
Preferably, the inner wall surface in combination with the variable structure wall surface 1-5 has a relief pit for suppression of "super knock", as shown in fig. 7 for the variable structure wall surface 1-5 having a relief pit, and the relief pit structure is only one representative structure and is not limited to this structure.
The installation process of the device for researching formation and inhibition of in-cylinder detonation under the detonation of the internal combustion engine comprises the following steps: sleeving the outer bushing 1-4 with variable thickness on the variable structure cylinder cover 1-1; inserting a variable structure cylinder cover 1-1 into the periphery 1-7 of the elastomer, and sealing the gas by using a cylinder cover sealing ring 1-2 to isolate the gas in a combustion chamber; inserting the variable-thickness inner bushing 1-3 into the periphery 1-7 of the elastomer and contacting with the end face of the variable-structure cylinder cover 1-1; inserting a variable structure wall surface 1-5 which is provided with small exhaust holes 1-12 and welded with air inlet and exhaust pipes 1-13 into the periphery 1-7 of the elastomer, contacting with the end surface of a variable thickness inner bushing 1-3, and tightly pressing and sealing through a peripheral sealing ring 1-8 of the elastomer to isolate gas in a combustion chamber; embedding the sensor installation wall 1-6 into the wall surface 1-5 of the variable structure, and enabling the end surfaces to be contacted, enabling the air inlet and outlet pipes 1-13 welded on the wall surface 1-5 of the variable structure to penetrate through the sensor installation wall 1-6, and connecting the sensor installation wall 1-6 with the wall surface 1-5 of the variable structure through sunk screws; sequentially penetrating a group of bolts 1-14 into a variable structure cylinder cover 1-1, a variable thickness outer bushing 1-4, a projectile body periphery 1-7, a variable structure wall surface 1-5 and a sensor installation wall 1-6, and then bolting, pressing and sealing the whole detonation volume projectile; screwing a series of cylinder pressure sensors 1-11 on the detonation volume bomb body, tightly pressing and sealing the detonation volume bomb body through a copper gasket, and connecting the series of cylinder pressure sensors 1-11 to a cylinder pressure synchronous acquisition system; screwing the high-energy spark plugs 1-9 into the bomb-containing body, isolating gas in a combustion chamber through the high-energy spark plug sealing rings 1-10, and connecting the high-energy spark plugs 1-9 to an adjustable high-energy ignition system; the air inlet and outlet pipes 1-13 are connected with the bullet containing stop valves 2-10 on the air distribution table through steel pipes and double clamping sleeves.
The test method for forming and inhibiting the cylinder internal detonation wave under the 'super detonation' of the internal combustion engine can be realized through the detonation capacitance bomb device, and specifically comprises the following steps:
s1, sticking the smoked smoke film on the side wall surface of the combustion chamber of the variable structure cylinder cover 1-1 and the side wall surface of the combustion chamber of the variable structure cylinder cover 1-5 by directly using lead foil, and recording a cell image in the detonation wave forming process. And assembling the detonation container bomb body according to the installation process, and waiting for an experiment. The principle that the smoke film or the lead foil records the detonation wave cell lattice image is that once the detonation wave forms, a three-wave structure can be formed, the three-wave structure can form a shear layer, smoke traces on the smoke film are taken away, or a lead material on the lead foil is cut away, so that a fish scale-shaped shape is left, and the specific characteristics of the detonation wave can be reflected for the cell lattice image of the detonation wave.
S2, adjusting ignition energy in the adjustable high-energy ignition system to enable the ignition energy to be lower than critical detonation energy of mixed gas used in experiments, and enabling the high-energy spark plug to only ignite detonation waves without directly forming the detonation waves.
And S3, calculating the partial pressure of the reducing agent and the oxidizing agent according to the initial total pressure and the equivalence ratio of the gas required by the experiment, and preparing to start the experiment.
S4, opening a vacuum pump 2-12 of the gas distribution table 2, opening a vacuum pump stop valve 2-2 and a bomb containing stop valve 2-10, vacuumizing gas in a bomb containing space, observing an absolute pressure gauge 2-11, and reducing the display number to be within 1 kPa. And closing the vacuum pump stop valve 2-2.
S5, slowly opening the oxidant stop valve 2-7 to enable the oxidant to slowly enter the detonation containing bomb through the five-way cavity 2-1, observing the readings of the absolute pressure gauge 2-11, and rapidly and sequentially closing the bomb containing stop valve 2-10 and the oxidant stop valve 2-7 after the specified partial pressure calculated in the step S3 is achieved. And then opening a stop valve 2-2 of a vacuum pump, vacuumizing the residual oxidant in the gas distribution table, observing an absolute pressure gauge 2-11, and reducing the display value to be within 1 kPa. And closing the vacuum pump stop valve 2-2.
S6, slowly opening the reducing agent stop valve 2-4 to enable the reducing agent to slowly enter the detonation containing bomb through the five-way cavity 2-1, observing the readings of the absolute pressure gauge 2-11, and quickly and sequentially closing the bomb containing stop valve 2-10 and the reducing agent stop valve 2-4 after the specified partial pressure calculated in the step S3 is achieved. And then opening a stop valve 2-2 of a vacuum pump, vacuumizing the residual reducing agent in the gas distribution table, observing an absolute pressure gauge 2-11, and reducing the display value to be within 1 kPa. And closing the vacuum pump stop valve 2-2.
And S7, modulating a cylinder pressure synchronous acquisition system (comprising all cylinder pressure sensors, a charge amplifier, a power supply debugging instrument and a multi-channel oscilloscope) to a state to be triggered, and then starting a high-energy ignition system to realize single ignition. After ignition, deflagration waves are formed at the position of a high-energy spark plug in the bomb, and after the cylinder pressure sensor receives a pressure pulse signal, the cylinder pressure synchronous acquisition system is triggered to synchronously acquire and store a series of cylinder pressure sensors.
S8, opening the bomb-containing stop valve 2-10 and the vacuum pump stop valve 2-2 in sequence, and vacuumizing the combustion products in the bomb. Observing absolute pressure gauge 2-11, and reducing the display value to within 1 kPa. And (3) closing the vacuum pump stop valve 2-2 and opening the ambient air stop valve 2-3, so that the atmosphere enters the gas distribution platform and the detonation container bomb body to realize pressure balance. And (3) removing a group of bolts 1-14, and extracting the sensor installation wall 1-6 fixed by the countersunk head bolts and the wall surface 1-5 of the variable structure integrally. And taking out the lead foil or the smoke film in the combustion chamber and recording the cell imprints or the cell patterns, wherein the recording mode can adopt a scanning mode, a photographic mode and the like.
S9, in different comparison experiments, a variable structure cylinder cover 1-1 and a spark plug position which are different in geometric shape, a pair of variable thickness inner bushings 1-3 and variable thickness outer bushings 1-4 which are different in thickness, different hole structures (comprising different hole coverage rates, different porosities, different hole diameters, different hole depths, different hole angles and the like) or variable structure wall surfaces 1-5 of pressure relief pits which are different in structure, different equivalence ratios and total pressures can be replaced, and therefore the influence of different spark plug ignition positions, different combustion chamber geometric shapes and different wall surface structures on the formation and inhibition of detonation waves under the super detonation working condition of the internal combustion engine can be researched. After each parameter change, the experiment was repeated according to the steps described in S1-S8 to verify the consistency and reliability of the rule. The law is a detonation wave detonation or failure law, and specifically refers to a law whether detonation waves are formed under different wall surface structures, ignition positions, different combustion chamber shapes and different working conditions (different initial pressures, temperatures and equivalence ratios). Because the formation of the detonation wave has certain randomness near the critical condition, the rule of the detonation wave cannot be determined by a single experimental result, and a plurality of repeated experiments need to be carried out under the same condition to ensure that the detonation wave can be formed certainly or cannot be formed certainly, so that the reliability of the obtained rule is ensured.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The device for researching formation and inhibition of detonation in the cylinder under detonation of the internal combustion engine is characterized by comprising a detonation shell containing body and a gas distribution table, wherein the detonation shell containing body comprises a variable structure cylinder cover (1-1), a variable thickness inner bushing (1-3), a variable structure wall surface (1-5), a shell periphery (1-7), a high-energy spark plug (1-9), at least one cylinder pressure sensor (1-11), an air inlet and exhaust pore (1-12) and an air inlet and exhaust pipe (1-13), the shell periphery (1-7) is sleeved outside the variable structure cylinder cover (1-1) and the variable structure wall surface (1-5), the variable thickness inner bushing (1-3) is arranged on the inner side of the shell periphery (1-7), and two end faces of the variable thickness inner bushing (1-3) are respectively matched with the variable structure cylinder cover (1-1) The variable structure cylinder cover (1-1) and the variable structure wall surface (1-5) are in contact with opposite end surfaces, a combustion chamber space is formed between the variable structure cylinder cover (1-1) and the variable structure wall surface (1-5), the high-energy spark plug (1-9) extends into the combustion chamber space, the at least one cylinder pressure sensor (1-11) is used for detecting the pressure in the combustion chamber space, and the combustion chamber space is communicated with a gas distribution table through a gas inlet and outlet small hole (1-12) and a gas inlet and outlet pipe (1-13);
the detonation containing bomb body further comprises a variable thickness outer bushing (1-4) and a sensor mounting wall (1-6), wherein the variable thickness outer bushing (1-4) is located between the end face of the periphery (1-7) of the bomb body and the end face of the variable structure cylinder cover (1-1), and the sensor mounting wall (1-6) is located on the outer side of the variable structure wall face (1-5);
the high-energy spark plug ignition system is characterized by further comprising an adjustable high-energy ignition system, wherein the high-energy spark plugs (1-9) are connected with the adjustable high-energy ignition system, and the adjustable high-energy ignition system is used for adjusting ignition energy of the high-energy spark plugs (1-9);
the gas distribution table comprises a five-way cavity, a vacuum pump stop valve (2-2), an ambient air stop valve (2-3), a reducing agent stop valve (2-4), a reducing agent pressure reducing valve (2-5), a reducing agent storage tank (2-6), an oxidizing agent stop valve (2-7), an oxidizing agent pressure reducing valve (2-8), an oxidizing agent storage tank (2-9), an bomb-containing stop valve (2-10), an absolute pressure gauge (2-11) and a vacuum pump (2-12), wherein one end of the bomb-containing stop valve (2-10) is connected with the five-way cavity, the other end of the bomb-containing stop valve is connected with a gas inlet and outlet pipe (1-13), the absolute pressure gauge (2-11) is used for measuring the pressure in the five-way cavity, and the vacuum pump (2-12) is connected with the five-way cavity through the vacuum pump stop valve (2-2), the oxidant storage tank (2-9) is connected with the five-way cavity through an oxidant reducing valve (2-8) and an oxidant stop valve (2-7), and the reducing agent storage tank (2-6) is connected with the five-way cavity through a reducing agent reducing valve (2-5) and a reducing agent stop valve (2-4);
the inner wall surface of the variable structure wall surface (1-5) is provided with sound absorption porous media with different parameters or the inner wall surface of the variable structure wall surface (1-5) is provided with a pressure relief pit.
2. The device for studying cylinder detonation formation and suppression under detonation of an internal combustion engine according to claim 1, characterized by further comprising a plurality of sets of bolts (1-14), said plurality of sets of bolts (1-14) being arranged in sequence through the variable structure cylinder head (1-1), the variable thickness outer liner (1-4), the projectile periphery (1-7), the variable structure wall surface (1-5) and the sensor mounting wall (1-6).
3. The device for researching formation and suppression of in-cylinder detonation under internal combustion engine detonation according to claim 1, characterized in that the small air inlet and outlet holes (1-12) are opened on a wall surface (1-5) of a variable structure, and the air inlet and outlet pipes (1-13) are connected with the small air inlet and outlet holes (1-12) through a sensor mounting wall (1-6).
4. The device for researching formation and inhibition of in-cylinder detonation under detonation of the internal combustion engine according to claim 1, further comprising a cylinder head sealing ring (1-2), an elastomer peripheral sealing ring (1-8) and a high-energy spark plug sealing ring (1-10), wherein the cylinder head sealing ring (1-2) is arranged between the elastomer periphery (1-7) and a variable structure cylinder head (1-1), the elastomer peripheral sealing ring (1-8) is arranged between the elastomer periphery (1-7) and a variable structure wall surface (1-5), and the high-energy spark plug sealing ring (1-10) is arranged between a high-energy spark plug (1-9) and a cylinder head variable structure (1-1).
5. A method for studying the formation and suppression of in-cylinder detonation upon detonation of an internal combustion engine using the apparatus of claim 1, the method comprising the steps of:
s1, sticking a smoked smoke film or directly sticking a lead foil on the inner side wall surface of a variable structure cylinder cover (1-1) and the inner side wall surface of a variable structure wall surface (1-5) for recording a cell image in a detonation wave forming process;
s2, adjusting ignition energy in the adjustable high-energy ignition system to enable the ignition energy to be lower than critical detonation energy of mixed gas used in experiments, so that the high-energy spark plugs (1-9) can only ignite detonation waves and cannot directly form the detonation waves;
s3, calculating partial pressures of the reducing agent and the oxidizing agent according to the initial total pressure and the equivalence ratio of the gas required by the experiment, and preparing to start the experiment;
s4, starting a vacuum pump (2-12) of the gas distribution platform, starting a vacuum pump stop valve (2-2) and a bomb-containing stop valve (2-10), pumping gas in the detonation bomb body to vacuum, observing an absolute pressure gauge (2-11), reducing the indication number to be within 1kPa, and closing the vacuum pump stop valve (2-2);
s5, slowly opening an oxidant stop valve (2-7) to enable oxidant to slowly enter the detonation bomb body through the five-way cavity, observing the indication number of an absolute pressure gauge (2-11), rapidly and sequentially closing the bomb stop valve (2-10) and the oxidant stop valve (2-7) after the specified partial pressure calculated in the step S3 is reached, then opening a vacuum pump stop valve (2-2), pumping residual oxidant in the gas distribution table to vacuum, observing the absolute pressure gauge (2-11), reducing the indication number to be within 1kPa, and closing the vacuum pump stop valve (2-2);
s6, slowly opening a reducing agent stop valve (2-4) to enable a reducing agent to slowly enter the detonation bomb body through the five-way cavity, observing the indication number of an absolute pressure gauge (2-11), rapidly and sequentially closing the bomb stop valve (2-10) and the reducing agent stop valve (2-4) after the specified partial pressure calculated in the step S3 is reached, then opening a vacuum pump stop valve (2-2), pumping the residual reducing agent in the gas distribution table to vacuum, observing the absolute pressure gauge (2-11), reducing the indication number to be within 1kPa, and closing the vacuum pump stop valve (2-2);
s7, after modulating a to-be-triggered state by the cylinder pressure synchronous acquisition system, starting the high-energy ignition system to realize single ignition, forming deflagration waves at the positions of high-energy spark plugs (1-9) after ignition, and after receiving pressure pulse signals by the cylinder pressure sensors (1-11), synchronously acquiring and storing a plurality of cylinder pressure sensors by the triggered cylinder pressure synchronous acquisition system;
s8, opening a bomb-containing stop valve (2-10) and a vacuum pump stop valve (2-2) in sequence, vacuumizing a combustion product in the detonation bomb-containing body, observing an absolute pressure gauge (2-11), reducing the indication number to be within 1kPa, closing the vacuum pump stop valve (2-2), opening an ambient air stop valve (2-3), enabling the atmosphere to enter a gas distribution table and the detonation bomb-containing body, realizing pressure balance, extracting the whole of a sensor mounting wall (1-6) and a variable structure wall surface (1-5), taking out a lead foil or a smoke film in the combustion chamber, and recording cell marks or cell patterns;
s9, in different comparative experiments, a pair of variable thickness inner bushings (1-3) and variable thickness outer bushings (1-4) with different geometrical shapes and/or variable structure wall surfaces (1-5) of different hole structures or different structure pressure relief pits and/or different equivalence ratios and total pressures are replaced by variable structure cylinder covers (1-1) with different geometrical shapes and/or high-energy spark plugs (1-9) with different positions and/or thicknesses, therefore, the influence of different high-energy spark plugs (1-9) on the formation and inhibition of detonation waves under the super detonation working condition of the internal combustion engine by different combustion chamber geometric shapes and different wall surface structures is researched, in different comparison experiments, and (5) performing repeated experiments according to the steps of S1-S8 to verify the consistency and reliability of rules, wherein the rules comprise detonation wave initiation or failure rules.
6. The method according to claim 5, wherein the different pore structures in step S9 comprise different pore coverage, different porosity, different pore diameter, different pore depth, and different pore angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010510817.9A CN111521404B (en) | 2020-06-08 | 2020-06-08 | Device and method for researching formation and inhibition of in-cylinder detonation under detonation of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010510817.9A CN111521404B (en) | 2020-06-08 | 2020-06-08 | Device and method for researching formation and inhibition of in-cylinder detonation under detonation of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111521404A CN111521404A (en) | 2020-08-11 |
| CN111521404B true CN111521404B (en) | 2022-03-08 |
Family
ID=71911447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010510817.9A Active CN111521404B (en) | 2020-06-08 | 2020-06-08 | Device and method for researching formation and inhibition of in-cylinder detonation under detonation of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111521404B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117740386B (en) * | 2024-02-21 | 2024-04-30 | 北京大学 | Pre-detonation tube capable of automatically lifting electric spark plug and operation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003176751A (en) * | 2001-10-01 | 2003-06-27 | Kokusan Denki Co Ltd | Internal combustion engine igniter |
| CN104132775A (en) * | 2014-07-15 | 2014-11-05 | 清华大学 | Turbocharged gasoline engine super detonation test device and test method |
| CN107796628A (en) * | 2017-07-28 | 2018-03-13 | 天津大学 | A kind of constant volume detonation corrosion chamber and method that can monitor detonation wave fluctuation behavior |
| CN207198074U (en) * | 2017-07-25 | 2018-04-06 | 公安部天津消防研究所 | A kind of restricted clearance fires simulation and elongnated building, datonation-inhibition experiment porch |
| CN107917810A (en) * | 2017-07-28 | 2018-04-17 | 天津大学 | A kind of experimental rig and method that can monitor detonation wave effect lower piston material temperature change |
| CN107942029A (en) * | 2017-11-14 | 2018-04-20 | 北京科技大学 | A kind of fast and effective direct initiation detonation pipeline group and experimental method |
-
2020
- 2020-06-08 CN CN202010510817.9A patent/CN111521404B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003176751A (en) * | 2001-10-01 | 2003-06-27 | Kokusan Denki Co Ltd | Internal combustion engine igniter |
| CN104132775A (en) * | 2014-07-15 | 2014-11-05 | 清华大学 | Turbocharged gasoline engine super detonation test device and test method |
| CN207198074U (en) * | 2017-07-25 | 2018-04-06 | 公安部天津消防研究所 | A kind of restricted clearance fires simulation and elongnated building, datonation-inhibition experiment porch |
| CN107796628A (en) * | 2017-07-28 | 2018-03-13 | 天津大学 | A kind of constant volume detonation corrosion chamber and method that can monitor detonation wave fluctuation behavior |
| CN107917810A (en) * | 2017-07-28 | 2018-04-17 | 天津大学 | A kind of experimental rig and method that can monitor detonation wave effect lower piston material temperature change |
| CN107942029A (en) * | 2017-11-14 | 2018-04-20 | 北京科技大学 | A kind of fast and effective direct initiation detonation pipeline group and experimental method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111521404A (en) | 2020-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9752949B2 (en) | System and method for locating engine noise | |
| CN111521404B (en) | Device and method for researching formation and inhibition of in-cylinder detonation under detonation of internal combustion engine | |
| CA2919242C (en) | Methods and systems to derive knock sensor conditions | |
| KR20160126874A (en) | Knock sensor systems and methods for detection of component conditions | |
| EP3059568A1 (en) | Signal recording of knocking conditions using a knock sensor | |
| CN109738149B (en) | Device, system and method for testing antiknock performance of spark plug | |
| CN104132775A (en) | Turbocharged gasoline engine super detonation test device and test method | |
| Khosravi et al. | Investigation into Occurrence of Megaknock and Auto-Ignition in GTDI Engines | |
| CN105527106A (en) | Testing device for evaluating influence of machine oil on super knock and testing method | |
| US9869257B2 (en) | System and method for predicting peak pressure values using knock sensor | |
| Liu et al. | Highly turbocharged gasoline engine and rapid compression machine studies of super-knock | |
| CN106840684B (en) | Constant volume-constant pressure mixed combustion simulation experiment device and control method thereof | |
| CA2134815A1 (en) | Misfire detection method for an internal combustion engine | |
| CN217029251U (en) | Rapid compressor combustion cylinder platform for studying detonation experiment | |
| JP6767749B2 (en) | Methods and systems for determining the location of peak combustion pressure | |
| Merola et al. | Experiments on knocking and abnormal combustion through optical diagnostics in a boosted spark ignition port fuel injection engine | |
| CN110806318B (en) | Two-dimensional flat visual constant-volume combustion bomb | |
| Franklin et al. | A study of knock and power loss in the automotive spark ignition engine | |
| CN207757053U (en) | Deburring machine by gas heat energy | |
| CN110220807A (en) | A kind of aircraft power cabin band shell testpieces flame proof experimental rig | |
| CN2687122Y (en) | Piston primer detonator | |
| CN115791104A (en) | Detachable wave absorption structure testing device and method | |
| JPS56110524A (en) | Method for airtight device of superexplosive internal combustion engine utilizing superhigh voltage or superblow or supercompression of plasma and the like | |
| Korczewski et al. | Use of langmuir probe in diesel engine diagnostic research. Part I measurement technology | |
| WO2013166270A1 (en) | Energy transducer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |