CN109281826B - A kind of compression terminal temperature adjusting method for laboratory fast compressor - Google Patents
A kind of compression terminal temperature adjusting method for laboratory fast compressor Download PDFInfo
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- CN109281826B CN109281826B CN201811261020.9A CN201811261020A CN109281826B CN 109281826 B CN109281826 B CN 109281826B CN 201811261020 A CN201811261020 A CN 201811261020A CN 109281826 B CN109281826 B CN 109281826B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
Abstract
The invention discloses a kind of compression terminal temperature adjusting methods for fast compressor experiment, comprising: 1) determines the component of combustion mixture in fast compressor experiment；2) gross pressure for determining combustion mixture in combustion chamber is P, calculates corresponding partial pressure Pi=P*Xi according to each gas volume fraction；3) after evacuating mixed gas tank, gas is successively filled with by corresponding partial pressure and completes combustion mixture configuration；4) first compression is completed to the combustion mixture, records the pressure change in lower combustion chamber；5) the compression terminal temperature Tc that this experiment is calculated in formula is insulated according to perfect gas；6) part argon gas in diluent gas is replaced with into nitrogen, repeats step 3) -5), obtain comparing lower compression terminal temperature for the first time.The present invention changes compression terminal temperature in the case where not changing existing experimental provision structure, by changing diluent gas ingredient in gaseous mixture, to effectively widen experiment condition range.
Description
Technical field
The invention belongs to the simulations of internal combustion engine compression stroke, Combustion field, and in particular to one kind is used for the fast ram compression in laboratory
The compression terminal temperature adjusting method of contracting machine, to study the infrastest of fuel pressuring combustion ignition characteristic and characteristics of flame.
Background technique
Fast compressor experimental provision can study auto-ignition characteristic of the combustion mixture of certain component under different operating conditions,
It is specific then be so that it is reached specified initial temperature and pressure, certain time in a short time by Fast Compression fuel gas
For gas by auto-ignition, this period is ignition time delay of the fuel under this operating condition afterwards, measures ignition time delay data pair
The chemical reaction kinetic model for developing fuel has very big help.And accurately model is ground for improving burning efficiency of internal combustion engine
Study carefully pinking, structure great significance for design.
The piston of fast compressor reaches compression terminal after completing first compression stroke, and burn indoor gaseous mixture at this time
Thermodynamic state is thermodynamic state of the gaseous mixture in compression terminal, it depends primarily on the component of gaseous mixture before compression,
Thermodynamic state and the current compression ratio of experimental provision.
For auto-ignition characteristic of the research gaseous mixture under different operating conditions, the mode that change compression ratio is widely used in the world changes
Become gaseous mixture in the thermodynamic state of compression terminal.In this way, to reach lower compression terminal temperature just need compared with
Small compression ratio increases the volume of compression end of time combustion chamber, fuel lower for some saturated vapour pressures, combustion chamber
In mixture pressure be difficult to reach very high to limit the expansion that experiment condition includes temperature, pressure limit.
In view of the above-mentioned problems, effectively being widened it is necessary to design one kind in the case where not changing existing experimental provision structure
The universal method of experiment condition range.
Summary of the invention
It is a kind of for laboratory fast compressor it is an object of the invention in view of the above shortcomings of the prior art, provide
Compression terminal temperature adjusting method, this method in the case where not changing existing experimental provision structure, pass through change gaseous mixture
Middle diluent gas ingredient changes compression terminal temperature, to effectively widen experiment condition range.
The present invention adopts the following technical scheme that realize:
A kind of compression terminal temperature adjusting method for laboratory fast compressor, comprising the following steps:
1) the component for determining combustion mixture in fast compressor experiment determines fuel gas, oxygen, diluent gas is each
The volume fraction X1, X2, X3 of comfortable total combustion mixture；
2) gross pressure for determining combustion mixture in combustion chamber is P, calculates corresponding partial pressure Pi according to each gas volume fraction
=P*Xi, i=1,2,3；
3) after mixing gas tank using vacuum pump depletion, gas pressure inside the tank is mixed with gauge measurement, numerical value V0 is recorded, is filled with fuel
Gas to pressure gauge registration is V1, so that V1-VO=P*X1；
4) being filled with high-purity oxygen to pressure gauge registration is V2, so that V2-V1=P*X2；
5) being filled with high purity argon to pressure gauge registration is V3, so that V3-V2=P*X3, is so far completed flammable for the first time mixed
Close gas configuration；
6) first compression is completed to the combustion mixture using fast compressor, and records lower combustion chamber with pressure sensor
Interior pressure change；
7) the compression terminal temperature Tc that this experiment is calculated in formula is insulated according to perfect gas；
8) step 3) -4 is repeated) after, being filled with high-purity nitrogen to pressure gauge registration is V3, so that V3-V2=P*X3, is completed
Second of combustion mixture configuration；
9) first compression is completed to the combustion mixture using fast compressor, and records lower combustion chamber with pressure sensor
Interior pressure change；
10) it is calculated according to perfect gas insulation formula and compares the lower compression terminal temperature of previous run.
A further improvement of the present invention lies in that the concrete methods of realizing of step 7) is as follows:
701) found on substance thermodynamic parameter handbook fuel gas, oxygen, argon gas, nitrogen specific heat ratio be respectively
γ1、γ2、γ3、γ4；
702) according to formula γ=∑iγiXiThe specific heat ratio γ of combustion mixture is calculated；
703) go out ambient room temperature Ti where combustion mixture before testing using thermometer measure；
704) according to pressure sensor record data obtain combustion mixture in combustion chamber before compression with compression terminal
Pressure is respectively PiAnd Pc；
705) according to perfect gas adiabatic compression formulaIt calculates combustion mixture and is working as preceding article
Compression terminal temperature Tc under part.
The present invention has following beneficial technical effect:
The present invention waits the collocation of diluent gas by using argon gas, nitrogen, can be under conditions of not changing compression ratio effectively
Adjust the temperature of compression terminal gaseous mixture.Compression can be adjusted in the case where not changing experimental provision compression ratio eventually using the method
Point temperature, avoids the disassembly of experimental provision, eliminates because of device dismounting bring abrasion and the variation of experiment primary condition,
Experimental repeatability and stability are improved, and extends the service life of experimental provision.In addition, in identical compression terminal temperature model
In enclosing, compared to the adjusting method for changing compression ratio, combustion mixture initial pressure needed for this method is less, and which save match
It sets the time of combustion mixture, economic cost, also the development for some low saturated vapour pressure fuel experimentals provides feasibility.
Detailed description of the invention
Fig. 1 is the corresponding relationship of compression terminal temperature and carrier gas component.
Fig. 2 is to adjust compression ratio method and this method in pair of different compression terminal temperatures and required initial mixing atmospheric pressure
It should be related to.
Specific embodiment
Invention is made further instructions below in conjunction with drawings and examples.
For different research object and experiment condition, the improvement effect of this method is also not quite similar.Below in conjunction with specific
Example explanation, for by normal heptane, oxygen, the combustion mixture of diluent gas composition, in equivalent proportion 1.0, thinner ratio 3.72, pressure
Under the conditions of contracting terminal pressure 20bar, combustion mixture compression terminal temperature to be adjusted is changed to 750K from 850K.
1) normal heptane is found on substance thermodynamic parameter handbook, oxygen, argon gas, the specific heat ratio of nitrogen is respectively γ 1,
γ 2, γ 3, γ 4.
2) normal heptane, oxygen, diluent gas volume accounting in total combustion mixture are determined according to equivalent proportion and thinner ratio
Than being respectively X1, X2, Xd.There is X1+X2+Xd=1.
3) diluent gas is made of nitrogen and argon gas, and argon gas and nitrogen volume fraction are respectively X3, X4.There is X3+X4=Xd.
4) go out ambient room temperature Ti where combustion mixture before testing using thermometer measure.
5) when diluent gas is full argon gas, i.e. nitrogen volume fraction X4 is 0.
6) according to formula γ=∑iγiXiThe specific heat ratio γ of combustion mixture is calculated.
7) first compression stroke is completed to combustion mixture using fast compressor, and records combustion chamber with pressure sensor
The relationship that interior pressure changes over time.It is whole with compression before compression that combustion mixture is obtained according to pressure sensor record data
The pressure P of pointiAnd Pc。
8) according to perfect gas adiabatic compression formulaCombustion mixture is calculated to dilute currently
Compression terminal temperature T under gas componentc。
9) when diluent gas is 90% argon gas and 10% nitrogen, X3=0.9*Xd, X4=0.1*Xd repeat step 6-8
Obtain compression terminal temperature T of the combustion mixture under current carrier gas componentc。
10) volume fraction of the argon gas in diluent gas is further decreased, until diluent gas is full nitrogen, argon can be obtained
Accounting of the gas in diluent gas from 100% be decremented to 0% by 10% when corresponding compression terminal temperature value variation relation, such as scheme
Shown in 1.
It can be obtained from Fig. 1, when diluent gas is full argon gas, compression terminal temperature 919.65K, diluent gas is full nitrogen
When, the compression of 750-850K can be completely covered in compression terminal temperature 704.85K using the method for adjusting diluent gas component
Outlet temperature range.If using change compression ratio adjustment compression terminal temperature method, by different compression terminal temperatures with it is required
The corresponding relationship of initial mixing atmospheric pressure is drawn as shown in Figure 2, it is possible to find this method under identical compression terminal temperature needed for
Combustion mixture initial pressure is lower, and especially the combustion mixture initial pressure needed for low temperature range, this method is substantially less than
Change the adjusting method of equivalent proportion.
Claims (1)
1. a kind of compression terminal temperature adjusting method for laboratory fast compressor, which comprises the following steps:
1) component for determining combustion mixture in fast compressor experiment, that is, determine fuel gas, oxygen, each leisure of diluent gas
The volume fraction X1, X2, X3 of total combustion mixture；Wherein diluent gas is high purity argon and nitrogen, flammable for the first time mixed
When closing gas configuration, diluent gas is full argon gas, and nitrogen volume fraction is 0, later when carrying out combustion mixture configuration, according to argon
Accounting of the gas in diluent gas is decremented to 0% by 10% from 100%, is filled with to mixed gas tank and is made of high purity argon and nitrogen
Mixed gas, reduce volume fraction of the argon gas in diluent gas, until when the configuration of last time combustion mixture, carrier gas
Body is full nitrogen, and argon gas volume fraction is 0；
2) gross pressure for determining combustion mixture in combustion chamber is P, calculates corresponding partial pressure Pi=P* according to each gas volume fraction
Xi, i=1,2,3；
3) after mixing gas tank using vacuum pump depletion, gas pressure inside the tank is mixed with gauge measurement, numerical value V0 is recorded, is filled with fuel gas
It is V1 to pressure gauge registration, so that V1-VO=P*X1；
4) being filled with high-purity oxygen to pressure gauge registration is V2, so that V2-V1=P*X2；
5) being filled with high purity argon to pressure gauge registration is V3, so that V3-V2=P*X3, so far completes first time combustion mixture
Configuration；
6) first compression is completed to the combustion mixture using fast compressor, and in pressure sensor record lower combustion chamber
Pressure change；
7) the compression terminal temperature Tc of this experiment is calculated according to perfect gas adiabatic compression formula, concrete methods of realizing is such as
Under:
701) found on substance thermodynamic parameter handbook fuel gas, oxygen, argon gas, nitrogen specific heat ratio be respectively γ1、
γ2、γ3、γ4；
702) according to formula γ=∑iγiXiThe specific heat ratio γ of combustion mixture is calculated；
703) go out ambient room temperature Ti where combustion mixture before testing using thermometer measure；
704) data are recorded according to pressure sensor and obtains the pressure of combustion mixture in combustion chamber before compression with compression terminal
Respectively Pi and Pc；
705) according to perfect gas adiabatic compression formulaCalculate combustion mixture under the present conditions
Compression terminal temperature Tc；
8) step 3) -4 is repeated), later when carrying out combustion mixture configuration each time, according to argon gas accounting in diluent gas
Than being decremented to 0% from 100% by 10%, the mixed gas being made of high purity argon and nitrogen is filled with to mixed gas tank, until filling
Entering high-purity nitrogen to pressure gauge registration is V3, so that V3-V2=P*X3, completes the configuration of last time combustion mixture；
9) in completion, combustion mixture completes primary press to the combustion mixture using fast compressor with postponing each time
Contracting, and the pressure change in lower combustion chamber is recorded with pressure sensor；
10) it is calculated according to perfect gas adiabatic compression formula and compares the lower compression terminal temperature of previous run.
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| CN110231363B (en) * | 2019-05-23 | 2020-07-28 | 西安交通大学 | Method for researching reaction mechanism of energetic material and evaluating safety |
| CN113283080B (en) * | 2021-05-25 | 2022-10-25 | 西安交通大学 | Method for quickly compensating heat of combustion chamber of compressor |
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| US4743276A (en) * | 1984-07-04 | 1988-05-10 | Nippon Kokan Kabushiki Kaisha | Method of separating carbon monoxide and carbon monoxide adsorbent used in this method |
| CN1129470A (en) * | 1993-06-26 | 1996-08-21 | 考文垂大学 | Internal combustion engine |
| JP2001073775A (en) * | 1999-08-30 | 2001-03-21 | Nissan Motor Co Ltd | Compression ignition type internal combustion engine |
| CN103670761A (en) * | 2012-09-19 | 2014-03-26 | 本田技研工业株式会社 | Combustion control device for internal combustion engine and combustion method for homogeneous lean air/fuel mixture |
| CN104376215A (en) * | 2014-11-19 | 2015-02-25 | 哈尔滨工程大学 | Method for calculating thermal performance of working process of air cylinder of marine main engine |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4743276A (en) * | 1984-07-04 | 1988-05-10 | Nippon Kokan Kabushiki Kaisha | Method of separating carbon monoxide and carbon monoxide adsorbent used in this method |
| CN1129470A (en) * | 1993-06-26 | 1996-08-21 | 考文垂大学 | Internal combustion engine |
| JP2001073775A (en) * | 1999-08-30 | 2001-03-21 | Nissan Motor Co Ltd | Compression ignition type internal combustion engine |
| CN103670761A (en) * | 2012-09-19 | 2014-03-26 | 本田技研工业株式会社 | Combustion control device for internal combustion engine and combustion method for homogeneous lean air/fuel mixture |
| CN104376215A (en) * | 2014-11-19 | 2015-02-25 | 哈尔滨工程大学 | Method for calculating thermal performance of working process of air cylinder of marine main engine |
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Inventor after: Tang Chenglong Inventor after: Liu Yang Inventor after: Huang Zuohua Inventor before: Liu Yang Inventor before: Tang Chenglong Inventor before: Huang Zuohua |
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Effective date of registration: 20210106 Address after: 362000 No.203, building 2, Jinlong City, Taocheng Town, Yongchun County, Quanzhou City, Fujian Province Patentee after: Quanzhou yongjue Technology Co., Ltd Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University |
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Effective date of registration: 20210219 Address after: Liu'an Development Zone, Yongchun County, Quanzhou City, Fujian Province (east side of Taoxi bridge) Patentee after: Yongchun County Product Quality Inspection Institute Fujian fragrance product quality inspection center, national incense burning product quality supervision and Inspection Center (Fujian) Address before: 362000 No.203, building 2, Jinlong City, Taocheng Town, Yongchun County, Quanzhou City, Fujian Province Patentee before: Quanzhou yongjue Technology Co., Ltd |