CN114962088B - Turbulent flow-phase change synergistic supercritical combustion strengthening method - Google Patents
Turbulent flow-phase change synergistic supercritical combustion strengthening method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M29/00—Apparatus for re-atomising condensed fuel or homogenising fuel-air mixture
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/11—Complex mathematical operations for solving equations, e.g. nonlinear equations, general mathematical optimization problems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a turbulent flow-phase change synergistic supercritical combustion strengthening method, which comprises the following steps: according to an ideal gas state equation, the relationship between the air inlet pressure, the air inlet temperature and the in-cylinder thermodynamic state of the top dead center of the combustion chamber is obtained according to the isentropic compression process relationship of the engine, and the in-cylinder thermodynamic state of the top dead center of the combustion chamber is determined according to the working condition and the strengthening degree of the engine; determining the supercritical phase change strength of supercritical spray under the corresponding thermodynamic state condition through the comparison pressure and the comparison temperature according to the critical attribute of the fuel; according to the supercritical phase transition intensity, the in-cylinder air inlet turbulence intensity and the oil injection pressure are adjusted, so that the synergistic effect of supercritical spraying and turbulence is realized. The supercritical combustion strengthening method can improve the utilization rate of air in the whole space in the cylinder, improve the oil-gas mixing quality, effectively improve the combustion performance of the high-strength diesel engine and realize the combustion strengthening of the diesel engine.
Description
Technical Field
The invention relates to the technical field of diesel engine combustion, in particular to a turbulent flow-phase change synergistic supercritical combustion strengthening method.
Background
The combustion performance of the diesel engine is directly affected by the processes of spray atomization, droplet phase change and oil-gas mixing. Therefore, the method accelerates the spray atomization, improves the oil-gas mixing speed, reduces the non-uniformity of the concentration of the combustible mixture, and is an effective means for improving the combustion performance of the diesel engine.
Modern diesel engines continue to develop towards high reinforcement, i.e. high working medium density and high injection pressure, thereby achieving the purpose of high power density. The density of the working medium is continuously increased, and the heat power conversion is directly influenced. Specifically, as the density of the working medium increases, the spray is retracted greatly, the utilization rate of the spray to the air in the cylinder decreases, in addition, under the high-temperature and high-pressure condition, the fuel may undergo supercritical phase transition, and the liquid drops undergoing the supercritical phase transition are converted into a dense supercritical state, the penetration capability of the liquid drops is greatly weakened, the oil-gas mixing is further hindered, the premixed combustion stage almost disappears due to the combined action of the liquid drops and the oil drops, the combustion duration increases, and finally the combustion is deteriorated.
In summary, the high-strength diesel engine has the problems of insufficient air utilization in the whole space of the combustion chamber, worsened oil-gas mixture and aggravated post-combustion, and restricts the further strength of the heavy diesel engine.
Disclosure of Invention
In view of the above, the invention provides a turbulent flow-phase change synergistic supercritical combustion enhancement method, by adopting the supercritical combustion enhancement method, the utilization rate of air in the whole space in a cylinder can be improved, the oil-gas mixing quality is improved, the combustion performance of a high-enhancement diesel engine is effectively improved, and the combustion enhancement of the diesel engine is realized.
The invention adopts the following specific technical scheme:
a turbulent-phase transition synergistic supercritical combustion enhancement method, the supercritical combustion enhancement method comprising:
according to an ideal gas state equation, the relationship between the air inlet pressure, the air inlet temperature and the in-cylinder thermodynamic state of the top dead center of the combustion chamber is obtained according to the isentropic compression process relationship of the engine, and the in-cylinder thermodynamic state of the top dead center of the combustion chamber is determined according to the working condition and the strengthening degree of the engine;
determining the supercritical phase change strength of supercritical spray under the corresponding thermodynamic state condition through the comparison pressure and the comparison temperature according to the critical attribute of the fuel;
according to the supercritical phase transition intensity, the in-cylinder air inlet turbulence intensity and the oil injection pressure are adjusted, so that the synergistic effect of supercritical spraying and turbulence is realized.
Further, determining the supercritical phase transition intensity of the supercritical spray under the corresponding thermodynamic state condition by comparing the pressure and the temperature, specifically comprising:
on the premise that the contrast pressure and the contrast temperature are both larger than 1, when the supercritical phase change strength criterion value A is larger than or equal to 3.2 and smaller than 3.6, weak supercritical phase change occurs to the spray; when the criterion value A of the supercritical phase transition intensity is more than or equal to 3.6, strong supercritical phase transition occurs to the spray;
the calculation formula of the supercritical phase transition intensity criterion value A is as follows:
A＝Tr×Pr 0.5 ；
wherein Tr is the comparison temperature and Pr is the comparison pressure.
Further, when the in-cylinder intake turbulence intensity and the oil injection pressure are regulated according to the supercritical phase transition intensity, the in-cylinder intake turbulence intensity and the oil injection pressure are in a proportional relation with the supercritical phase transition intensity.
Further, the calculation formula of the comparison temperature Tr is:
Tr＝Ta/Tc；
in the above formula, ta is the temperature at the upper dead point in the cylinder, and Tc is the critical temperature of fuel;
the calculation formula of the contrast pressure Pr is:
Pr＝Pa/Pc；
in the above expression, pa is the pressure at the cylinder top dead center, and Pc is the critical pressure of the fuel.
Further, the in-cylinder intake turbulence intensity is adjusted by the intake turbulence adjusting device.
The beneficial effects are that:
(1) According to the turbulence-phase transition synergistic supercritical combustion strengthening method, firstly, the in-cylinder thermodynamic state at the top dead center of a combustion chamber is determined according to the working condition and the strengthening degree of an engine; secondly, determining the supercritical phase change strength of supercritical spray under the corresponding thermodynamic state condition through the contrast pressure and the contrast temperature according to the critical attribute of the fuel; finally, adjusting the turbulence intensity of air inlet and the oil injection pressure in the cylinder according to the supercritical phase transition intensity to realize the synergistic effect of supercritical spraying and turbulence; through the steps, the in-cylinder thermodynamic state at the top dead center of the combustion chamber and the supercritical phase change intensity of supercritical spray are obtained, then the in-cylinder air inlet turbulence intensity and the oil injection pressure are regulated according to the supercritical phase change intensity, the in-cylinder air inlet turbulence intensity and the supercritical phase change intensity are utilized to cooperatively function, air inlet turbulence is organized, a turbulence leading diffusion mixing mechanism of supercritical fuel is fully exerted, the full-space air utilization rate of the combustion chamber of the supercritical spray is promoted, the oil-gas mixing and the combustion speed of the high-strength diesel engine are accelerated, the combustion performance of the high-strength diesel engine is effectively improved, and further strengthening of the diesel engine is realized.
(2) When the oil injection pressure and the in-cylinder air inlet turbulence intensity are regulated according to the supercritical phase change intensity, the in-cylinder air inlet turbulence intensity and the oil injection pressure are in a direct proportion relation with the supercritical phase change intensity, namely, the in-cylinder air inlet turbulence intensity and the oil injection pressure are both increased along with the increase of the supercritical phase change intensity and are both reduced along with the decrease of the supercritical phase change intensity, and the diesel engine can achieve optimal combustion performance under corresponding working conditions through the direct proportion relation between the in-cylinder air inlet turbulence intensity and the oil injection pressure and the supercritical phase change intensity, so that combustion enhancement is realized.
(3) When the turbulence intensity of air intake in the cylinder is regulated, the turbulence intensity of air intake in the cylinder is regulated by the air intake turbulence regulating device, so that the rapid regulation can be realized, the air intake turbulence intensity and the supercritical spray are matched with the oil injection pressure, and the oil-gas mixing speed is accelerated.
Drawings
FIG. 1 is a flow chart of the supercritical combustion enhancement method of the present invention;
FIG. 2 is a schematic diagram of synergistic mixing of supercritical spray and in-cylinder intake air turbulence;
FIG. 3 is a schematic diagram of intake turbulence during low supercritical phase transition intensity conditions;
FIG. 4 is a schematic diagram of inlet air turbulence during conditions of high supercritical phase transition intensity.
Wherein, 1-spraying, 2-liquid phase, 3-supercritical state, 4-in-cylinder turbulence, 5-air inlet channel, 6-air inlet turbulence regulating device and 7-combustion chamber
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The embodiment of the invention provides a turbulent flow-phase change synergistic supercritical combustion strengthening method, which is shown in figure 1 and comprises the following steps:
step S10, according to an ideal gas state equation, obtaining the relationship between the air inlet pressure, the air inlet temperature and the in-cylinder thermodynamic state of the top dead center of the combustion chamber 7 according to the isentropic compression process relationship of the engine, and determining the in-cylinder thermodynamic state of the top dead center of the combustion chamber 7 according to the working condition and the strengthening degree of the engine; the in-cylinder thermodynamic state comprises a temperature Ta at an in-cylinder top dead center and a pressure Pa at the in-cylinder top dead center; the degree of intensification of the engine includes a boost ratio and a compression ratio;
the ideal gas state equation is:
PV＝nRT；
wherein: p is pressure, and the unit is Pa; v is the volume of the gas, and the unit is m 3 The method comprises the steps of carrying out a first treatment on the surface of the T is temperature, and the unit is K; n is the amount of the substance of the gas in mol; r is the molar gas constant, also known as the universal gas constant, in J/(mol.K).
Step S20, determining the supercritical phase change strength of the supercritical spray 1 under the corresponding thermodynamic state condition through the contrast pressure and the contrast temperature according to the critical attribute of the fuel; the fuel critical properties include a critical temperature Tc and a critical pressure Pc of the fuel;
and step S30, adjusting the turbulence intensity of air inlet and the oil injection pressure in the cylinder according to the supercritical phase transition intensity, realizing the synergistic effect of the supercritical spray 1 and the turbulence, and enabling the synergistic effect of the turbulence intensity of the top dead center in the cylinder and the supercritical spray 1 to be optimal. In adjusting the in-cylinder intake turbulence intensity, the in-cylinder intake turbulence intensity may be adjusted by the intake turbulence adjusting device 6. As shown in fig. 4, an intake turbulence adjusting device 6 is provided in the intake passage 5.
When the turbulent flow-phase change synergistic supercritical combustion strengthening method is adopted for combustion strengthening, firstly, according to the working condition and strengthening degree of an engine, determining the in-cylinder thermodynamic state at the upper dead point of the combustion chamber 7; secondly, determining the supercritical phase change strength of the supercritical spray 1 under the corresponding thermodynamic state condition through the contrast pressure and the contrast temperature according to the critical attribute of the fuel; finally, adjusting the turbulence intensity of air inlet and the oil injection pressure in the cylinder according to the supercritical phase transition intensity to realize the synergistic effect of the supercritical spray 1 and the turbulence; through the steps, the in-cylinder thermodynamic state at the top dead center of the combustion chamber 7 and the supercritical phase change intensity of the supercritical spray 1 are obtained, then the in-cylinder air inlet turbulence intensity and the oil injection pressure are regulated according to the supercritical phase change intensity, the air inlet turbulence is organized by utilizing the synergistic effect of the in-cylinder air inlet turbulence intensity and the supercritical phase change intensity, the turbulence leading diffusion mixing mechanism of the supercritical state 3 fuel oil is fully exerted, the full-space air utilization rate of the combustion chamber 7 of the supercritical spray 1 is promoted, the oil-gas mixing and the combustion speed of the high-strength diesel engine are accelerated, the combustion performance of the high-strength diesel engine is effectively improved, and further strengthening of the diesel engine is realized.
When the turbulence intensity of air intake in the cylinder is regulated, the turbulence intensity of air intake in the cylinder is regulated by the air intake turbulence regulating device 6, and the air intake turbulence intensity is matched with the oil injection pressure, so that the synergistic effect of the air intake turbulence intensity and the supercritical spray 1 is realized, and the oil-gas mixing speed is accelerated.
In a specific embodiment, in step S20, the supercritical phase transition intensity of the supercritical spray 1 under the corresponding thermodynamic state condition is determined by the comparison pressure and the comparison temperature, and specifically includes:
on the premise that the contrast pressure and the contrast temperature are both larger than 1, when the supercritical phase change strength criterion value A is larger than or equal to 3.2 and smaller than 3.6, weak supercritical phase change occurs to the spray 1; when the criterion value A of the supercritical phase transition intensity is more than or equal to 3.6, strong supercritical phase transition occurs to the spray 1;
the calculation formula of the supercritical phase transition intensity criterion value A is as follows:
A＝Tr×Pr 0.5 ；
wherein Tr is the comparison temperature and Pr is the comparison pressure;
the calculation formula of the comparison temperature Tr is:
Tr＝Ta/Tc；
in the above formula, ta is the temperature at the upper dead point in the cylinder, and Tc is the critical temperature of fuel;
the calculation formula of the contrast pressure Pr is:
Pr＝Pa/Pc；
in the above expression, pa is the pressure at the cylinder top dead center, and Pc is the critical pressure of the fuel.
Specifically, in step S30, when the in-cylinder intake turbulence intensity and the injection pressure are adjusted according to the supercritical phase transition intensity, the in-cylinder intake turbulence intensity and the injection pressure are in a proportional relationship with the supercritical phase transition intensity.
When the oil injection pressure and the in-cylinder air intake turbulence intensity are regulated according to the supercritical phase transition intensity, the in-cylinder air intake turbulence intensity and the oil injection pressure are in a proportional relation with the supercritical phase transition intensity, namely, the in-cylinder air intake turbulence intensity is increased along with the increase of the supercritical phase transition intensity, the in-cylinder air intake turbulence intensity is reduced along with the decrease of the supercritical phase transition intensity, the oil injection pressure is increased along with the increase of the supercritical phase transition intensity, and the oil injection pressure is reduced along with the decrease of the supercritical phase transition intensity; after the turbulence intensity and the supercritical phase change intensity are determined, the oil injection pressure needs to be matched, when the supercritical phase change is strong, the penetration distance of the spray 1 is reduced, and at the moment, the oil injection pressure needs to be increased to compensate the reduction of the penetration distance caused by the supercritical phase change; therefore, the oil injection pressure needs to be increased along with the increase of the supercritical phase transition intensity, and the diesel engine can reach the optimal combustion performance under the corresponding working condition through the direct proportion change relation between the in-cylinder air inlet turbulence intensity and the oil injection pressure and the supercritical phase transition intensity, so as to realize the combustion enhancement.
After the thermodynamic state in the cylinder is determined, proper intake turbulence intensity and oil injection pressure are matched, and the enhanced combustion performance can be optimized under the reasonable synergistic effect of supercritical phase transition and turbulence in the cylinder. Too weak or too strong turbulence intensity or supercritical phase transition intensity can cause low air utilization rate, poor oil-gas mixing and unavoidable deterioration of combustion performance. Therefore, when the supercritical phase transition intensity is strong and the intake turbulence intensity is insufficient, the supercritical state 3 fuel cannot be quickly mixed with air, the full space air utilization rate of the oil beam spray 1 is insufficient, and the combustion performance is deteriorated. When the supercritical phase transition intensity is weak and the air inlet turbulence intensity is strong, interference can occur between adjacent oil bundles, and an excessive concentration area of the mixed gas is generated, so that the combustion performance can be deteriorated.
When the supercritical spray 1 is in low supercritical phase transition intensity, liquid drops in the liquid phase 2 in the spray 1 are still evaporated and mixed, only the liquid drops at the periphery of the spray 1 are subjected to supercritical phase transition and converted into a supercritical state 3, and only small-intensity air inlet turbulence is organized at the moment, so that the air inlet turbulence in a cylinder with relatively low intensity is obtained to cooperate with the air inlet turbulence, and rapid oil-gas mixing and combustion can be ensured; when the supercritical spray 1 is in high supercritical phase transition intensity, a large number of liquid drops exist in the spray 1 and are converted into a supercritical state 3, even when the spray 1 is sprayed out, all the liquid drops are converted into the supercritical state 3, at the moment, the penetrating capacity of the spray 1 is weakened, part of inflation efficiency is required to be sacrificed, high-intensity air inlet turbulence is organized, and relatively high-intensity in-cylinder air inlet turbulence is obtained, so that a diffusion mixing mechanism of the supercritical state 3 fuel is fully utilized, and the optimal oil-gas mixing and combustion performance under the high-reinforcement condition is realized, therefore,
according to the air inlet turbulence intensity, the air inlet turbulence intensity in the cylinder is regulated and controlled by changing the air inlet flow through the air inlet turbulence regulating device 6, and meanwhile, the proper oil injection pressure is matched, so that the corresponding synergistic effect of the supercritical spray 1 and the turbulence is realized. When the supercritical phase transition intensity is low, as shown in fig. 2, liquid drops in the liquid phase 2 in the spray 1 are still evaporated and mixed, only the peripheral liquid drops of the spray 1 are subjected to supercritical phase transition to be in a supercritical state 3, and only small-intensity air inlet turbulence is required to be organized at the moment, as shown in fig. 3, the relatively low-intensity in-cylinder turbulence 4 is obtained to cooperate with the air inlet turbulence, and the rapid oil-gas mixing and combustion can be ensured by matching with lower oil injection pressure. When the supercritical phase transition intensity is high, a large number of liquid drops are converted into a supercritical state 3 in the spray 1, even when the spray 1 is sprayed out, all the liquid drops are converted into the supercritical state 3, at the moment, the penetrating capability of the spray 1 is weakened, part of the inflating efficiency is required to be sacrificed, high-intensity air inlet turbulence is organized, as shown in fig. 4, the relatively high-intensity in-cylinder turbulence 4 is obtained, so that the diffusion mixing mechanism of the supercritical state 3 fuel is fully utilized, the higher fuel injection pressure is matched, and the optimal oil-gas mixing and combustion performance under the high-reinforcement condition is realized.
The following are specific examples:
the compression ratio of the diesel engine is generally 12-22, and assuming that the compression ratio of a high-strength diesel engine is 14, when the supercharging ratio is 3 and the intake air temperature is 330K, the combustion is calculated by an ideal gas state equation when fuel injection is not performed near the top dead center in the cylinder, and the in-cylinder pressure is 12MPa and the temperature is 950K. Because the diesel oil component is complex, the critical attribute change range is larger, the critical attribute of the n-dodecane is equivalent to that of the diesel oil, the critical temperature is 658K, the critical pressure is 1.82MPa, the contrast temperature Tr is 1.444, the contrast pressure Pr is 6.593, the supercritical phase transition intensity criterion value A is 3.71 and is larger than 3.6, therefore, the in-cylinder thermodynamic state belongs to a strong supercritical state, a large number of liquid drops are converted into the supercritical state 3 in the spray 1, in addition, according to the proportional relation between the average speed of a piston and the air flow pulsation speed in the combustion chamber 7, the high-intensity air inlet turbulence is organized by the air inlet turbulence adjusting device 6 in FIG. 3, the in-cylinder turbulence 4 intensity near the upper dead center is adjusted and controlled, the high oil injection pressure is matched, the penetration distance is increased, the synergistic effect of the turbulence intensity and the supercritical spray 1 is realized, the oil-gas mixing speed is accelerated, the full-space air utilization rate of the combustion chamber 7 is improved, the combustion performance of the enhanced combustion is effectively, and further enhancement of the combustion of the diesel engine is realized.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A supercritical combustion strengthening method for high-strengthening diesel turbulence-phase transition coordination, which is characterized by comprising the following steps:
according to an ideal gas state equation, the relationship between the air inlet pressure, the air inlet temperature and the in-cylinder thermodynamic state of the top dead center of the combustion chamber is obtained according to the isentropic compression process relationship of the engine, and the in-cylinder thermodynamic state of the top dead center of the combustion chamber is determined according to the working condition and the strengthening degree of the engine;
determining the supercritical phase change strength of supercritical spray under the corresponding thermodynamic state condition through the comparison pressure and the comparison temperature according to the critical attribute of the fuel;
according to the supercritical phase transition intensity, the turbulence intensity of air inlet and the oil injection pressure in the cylinder are regulated, so that the synergistic effect of supercritical spraying and turbulence is realized;
determining the supercritical phase transition intensity of the supercritical spray under the corresponding thermodynamic state condition by comparing the pressure and the temperature, wherein the method specifically comprises the following steps:
on the premise that the contrast pressure and the contrast temperature are both larger than 1, when the supercritical phase change strength criterion value A is larger than or equal to 3.2 and smaller than 3.6, weak supercritical phase change occurs to the spray; when the criterion value A of the supercritical phase transition intensity is more than or equal to 3.6, strong supercritical phase transition occurs to the spray;
the calculation formula of the supercritical phase transition intensity criterion value A is as follows:
A = Tr × Pr 0.5 ；
wherein Tr is the comparison temperature and Pr is the comparison pressure.
2. The method for enhanced turbulent-phase transition synergistic supercritical combustion of diesel engine as claimed in claim 1, wherein when the in-cylinder intake turbulence intensity and the injection pressure are adjusted according to the supercritical phase transition intensity, the in-cylinder intake turbulence intensity and the injection pressure are in direct proportional relation with the supercritical phase transition intensity.
3. The supercritical combustion strengthening method for high-strength diesel turbulence-phase transition synergy as claimed in claim 1, wherein the calculation formula of the comparative temperature Tr is:
Tr = Ta/Tc；
in the above formula, ta is the temperature at the upper dead point in the cylinder, and Tc is the critical temperature of fuel;
the calculation formula of the contrast pressure Pr is:
Pr = Pa/Pc；
in the above expression, pa is the pressure at the cylinder top dead center, and Pc is the critical pressure of the fuel.
4. A supercritical combustion reinforcing method for highly reinforcing diesel turbulence-phase transition synergy according to any one of claims 1 to 3 characterized in that in-cylinder intake turbulence intensity is regulated by an intake turbulence regulating means.
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| US7484498B2 (en) * | 2006-03-31 | 2009-02-03 | Mazda Motor Corporation | Spark-ignition gasoline engine |
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| US6557526B1 (en) * | 2001-11-09 | 2003-05-06 | Nissan Motor Co., Ltd. | Setting minimum spark advance for best torque in an internal combustion engine |
| JP2005344652A (en) * | 2004-06-04 | 2005-12-15 | Nissan Motor Co Ltd | Ignition timing controller of engine |
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