CN106840551A - Engine rig test intake and exhaust leak detection method - Google Patents
Engine rig test intake and exhaust leak detection method Download PDFInfo
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- CN106840551A CN106840551A CN201710015513.3A CN201710015513A CN106840551A CN 106840551 A CN106840551 A CN 106840551A CN 201710015513 A CN201710015513 A CN 201710015513A CN 106840551 A CN106840551 A CN 106840551A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
Abstract
Field, more particularly to a kind of engine rig test method are determined the present invention relates to engine performance.A kind of engine rig test intake and exhaust leak detection method, the gas leakage factor is 1 under the standard state entirely without gas leakage；The gas leakage factor is to detect to be balanced using C after C content in the exhaust for obtaining by measuring instrument speculate that Fuel Consumption judges gas leak phenomenon with the ratio of the actual fuel consumption of Real-time Collection into what in-engine material total amount was extrapolated on binding isotherm.The present invention is using the theoretical value for being calculated Fuel Consumption using Carbon balance into C content in in-engine material total amount and exhaust in theory, theoretical value and actual measured value are compared again, extent of deviation and bias direction monitor in real time air inlet side or the emergent gas leak phenomenon of exhaust side in process of the test can be passed through, eliminate because of the test error that gas leakage is caused, the test period of diminution, experiment rate of precision is increased, R＆D costs are reduced.
Description
Technical field
Field, more particularly to a kind of engine rig test method are determined the present invention relates to engine performance.
Background technology
When engine rig test is carried out using engine rig test system, because the system is in the air inlet of engine
End and exhaust end can all use many switching pipelines and be connected to correlation test equipment, and these switching pipelines are because be all to connect temporarily
Connect, therefore sealing property cannot ensure, cause engine often to occur air inlet system and exhaust system gas leak phenomenon during bench test,
And the intake and exhaust amount of engine has one to be fixed the result of the actual measurement parameters such as moment of torsion, explosion pressure, exhaust back pressure, gas discharge
Ring.
In order to avoid the accuracy of gas leakage effect result of the test, in the prior art, system is pressurizeed before testing typically,
Then suds are sprayed in seam crossing, according to the empirically determined judgement air inlet system and exhaust system air leakage of tester, then again to gas leakage
Part is repaired, and this mode is higher to the skill requirement of tester, and cannot be when bench test is carried out to gas leakage
It is monitored, the gas leakage that some happen suddenly in process of the test can equally influence result of the test, therefore have impact on to a certain extent
The accuracy of rig test result.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of engine rig test intake and exhaust leak detection method, should
Method is calculated the theory of Fuel Consumption using C content in the material total amount and exhaust for entering engine using Carbon balance
Value, then theoretical value and actual measured value are compared, the monitoring to the gas leak phenomenon happened suddenly in process of the test is realized, solve
The defect of gas leakage error in the prior art cannot be eliminated, R＆D costs are reduced.
What the present invention was realized in：A kind of engine rig test intake and exhaust leak detection method, established standardses deviation,
Using the C EQUILIBRIUM CALCULATION FOR PROCESS gas leakage factors, the gas leakage factor is 1 under the standard state entirely without gas leakage；The gas leakage factor is by measurement
Balanced on binding isotherm into pushing away that in-engine material total amount is extrapolated using C after C content in the exhaust that instrument detection is obtained
The ratio of Fuel Consumption and the actual fuel consumption of Real-time Collection is surveyed, when scope of the gas leakage factor beyond standard deviation,
Show there is gas leak phenomenon to occur, now：
Such as, thus it is speculated that Fuel Consumption ＞ actual fuel consumptions are then for air inlet side leaks air；
Such as, thus it is speculated that Fuel Consumption ＜ actual fuel consumptions are then for exhaust side leaks air.
Established standardses deviation is ± 0.03, and the gas leakage factor-beta is calculated by formula 1,
In formula, QCalculateIt is the supposition Fuel Consumption extrapolated using C balances in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time；
Now, such as gas leakage factor-beta ＞ 1.03, then show that air inlet side leaks air；
Now, such as gas leakage factor-beta ＜ 0.97, then show that exhaust side leaks air.
The actual fuel consumption Q of the Real-time Collection within the unit intervalSurveyCarried by engine rig test system
Flow measurement measure.
The supposition Fuel Consumption Q extrapolated using C balances within the unit intervalCalculateIt is calculated by formula 2,
QCalculate=QCO2+QCO+QHC (2)
In formula, QCO2It is CO in the exhaust obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs within the unit interval2The corresponding fuel consumption of content
Amount；
QCOIt is the corresponding Fuel Consumption of CO contents in the exhaust obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs within the unit interval；
QHCIt is the corresponding Fuel Consumption of HC emissions content obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs in the unit time.
CO in inlet air is ignored2During content, QCO2It is calculated by formula 3,
In formula, αCTo test the mass percentage content of fuel used middle C；
αCO2CO in the exhaust obtained for measuring instrument detection2Volume fraction；
γCO2It is the CO in exhaust2Volume fraction is converted into the transformation ratio of mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of the Real-time Collection within the unit interval.
The Q that the formula 3 is calculatedCO2It is butt value, i.e. QDry CO2, also using humidity value to Q in this methodDry CO2
It is modified and obtains QWet CO2The step of,
QWet CO2=QDry CO2×(1-1.85QSurvey/QDry air inlet) (6)
In formula, QAir inletIt is the butt value of air mass in the unit time；
D is air inlet water capacity；
P is experimental enviroment air pressure；
psIt is the corresponding saturated vapor air pressure of test ambient temperature；
The degree of saturation of water vapour content in expression humid air, referred to as relative humidity, are that stand humidity measuring device is surveyed
.
The QCOIt is calculated by formula 4,
In formula, αCTo test the mass percentage content of fuel used middle C；
αCOThe volume fraction of CO in the exhaust obtained for measuring instrument detection；
γCOIt is transformation ratio that CO volume fractions in exhaust are converted into mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time.
The Q that the formula 4 is calculatedCOIt is butt value, i.e. QDry CO, also using humidity value to Q in this methodDry COEnter
Row amendment obtains QWet COThe step of,
QWet CO=QDry CO×(1-1.85QSurvey/QDry air inlet) (7)
In formula, QAir inletIt is the butt value of air mass in the unit time；
D is air inlet water capacity；
P is experimental enviroment air pressure；
psIt is the corresponding saturated vapor air pressure of test ambient temperature；
The degree of saturation of water vapour content in expression humid air, referred to as relative humidity, are that stand humidity measuring device is surveyed
.
The QHCIt is calculated by formula 5,
QHC=γHC·αHC·(QAir inlet+QSurvey) (5)
In formula, αHCThe volume fraction of CO in the exhaust obtained for measuring instrument detection；
γHCIt is transformation ratio that HC volume fractions in exhaust are converted into mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time.
Inventive engine bench test intake and exhaust leak detection method is total using in-engine material is entered in theory
C content is calculated the theoretical value of Fuel Consumption using Carbon balance in amount and exhaust, then theoretical value and actual measured value are entered
Row compares, you can by extent of deviation and bias direction monitor in real time, air inlet side or exhaust side are emergent in process of the test
Gas leak phenomenon, eliminates because of the test error that gas leakage is caused, and the test period of diminution, increases experiment rate of precision, reduces
R＆D costs.
Specific embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content for having read statement of the present invention, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
Embodiment 1
A kind of engine rig test intake and exhaust leak detection method, before the test firstly the need of the ring according to testing ground
Border parameter is carried out to the flowmeter of the flowmeter of engine rig test system inlet end, the emission measuring instrument of exhaust end and fuel oil
Calibration, to ensure the accuracy of measurement data；
Then according to test accuracy and the requirement established standardses deviation of experiment, in the present invention, the standard deviation setting
It is ± 0.03；
Using the C EQUILIBRIUM CALCULATION FOR PROCESS gas leakage factors, the gas leakage factor is 1 under the standard state entirely without gas leakage；The gas leakage factor is
Detect to be balanced using C after C content in the exhaust for obtaining by measuring instrument and pushed away into in-engine material total amount on binding isotherm
What is calculated speculates the ratio of Fuel Consumption and the actual fuel consumption of Real-time Collection, when the gas leakage factor is beyond standard deviation
During scope, show there is gas leak phenomenon to occur, now：
Such as, thus it is speculated that Fuel Consumption ＞ actual fuel consumptions are then for air inlet side leaks air；
Such as, thus it is speculated that Fuel Consumption ＜ actual fuel consumptions are then for exhaust side leaks air.
In the present embodiment, the gas leakage factor-beta is calculated by formula 1,
In formula, QCalculateIt is the supposition Fuel Consumption extrapolated using C balances in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time, the stream carried by engine rig test system
Flowmeter measurement is obtained；
Now, such as gas leakage factor-beta ＞ 1.03, then show that air inlet side leaks air；
Now, such as gas leakage factor-beta ＜ 0.97, then show that exhaust side leaks air.
But, in the present invention, gas leakage factor-beta can be equally obtained by the way of reversely comparing, i.e.,This
When：Such as gas leakage factor-beta ＞ 1.03, then show that exhaust side leaks air；Such as gas leakage factor-beta ＜ 0.97, then show that air inlet side occurs
Gas leakage.
In process of the test, by being analyzed to gas leakage factor-beta by carry out leakage alarm, such as, continuously counting
According in sampling process, gas leakage factor-beta is varied to more than 1.03 suddenly from the range of 1 ± 0.03, illustrates that air inlet side leaks air,
Then stop testing according to test situation selection and overhauled or correct the error that the gas leakage is caused in follow-up data treatment；Leakage
Gas factor-beta is varied to less than 0.97 suddenly from the range of 1 ± 0.03, illustrates that exhaust side leaks air, then according to experiment feelings
Condition selection stops experiment and is overhauled or correct the error that the gas leakage is caused in follow-up data treatment；
In the present embodiment, it is described in unit after have ignored other minimum gases containing C of content in motor exhaust
The supposition Fuel Consumption Q that interior utilization C balances are extrapolatedCalculateIt is calculated by formula 2,
QCalculate=QCO2+QCO+QHC (2)
In formula, QCO2It is CO in the exhaust obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs within the unit interval2The corresponding fuel consumption of content
Amount；
QCOIt is the corresponding Fuel Consumption of CO contents in the exhaust obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs within the unit interval；
QHCIt is the corresponding Fuel Consumption of HC emissions content obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs in the unit time.
In the present embodiment, according to the demand of accuracy, and convenience of calculation, the CO in inlet air is ignored2And CO
During content,
The QCO2It is calculated by formula 3,
In formula, αCTo test the mass percentage content of fuel used middle C；
αCO2CO in the exhaust obtained for measuring instrument detection2Volume fraction；
γCO2It is the CO in exhaust2Volume fraction is converted into the transformation ratio of mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of the Real-time Collection within the unit interval.
The QCOIt is calculated by formula 4,
In formula, αCTo test the mass percentage content of fuel used middle C；
αCOThe volume fraction of CO in the exhaust obtained for measuring instrument detection；
γCOIt is transformation ratio that CO volume fractions in exhaust are converted into mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time.
In the present embodiment, the QHCObtained by hot type HC analyzer HFID measurements, sample gas need not be removed water, and be measured
Result is wet basis value, therefore without to QHCIt is modified, the QHCIt is calculated by formula 5,
QHC=γHC·αHC·(QAir inlet+QSurvey) (5)
In formula, αHCThe volume fraction of CO in the exhaust obtained for measuring instrument detection；
γHCIt is transformation ratio that HC volume fractions in exhaust are converted into mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time.
In the present embodiment, as CO in the exhaust using exhaust analyzer to Bench Test System2With the volume fraction of CO
, it is necessary to be dehydrated to sample gas when measuring, therefore when calculating, the Q that the formula 3,4 is actually calculatedCO2And QCOFor
Butt value after dehydration, i.e. QDry CO2And QDry CO, in order to eliminate the error of dehydration, also using humidity value to Q in this methodDry CO2
And QDry COIt is modified and obtains QWet CO2And QWet COThe step of, then by QWet CO2And QWet COBring into formula 2 as QCO2And QCOCounted
Calculate；
QWet CO2It is calculated by formula 6, QWet COIt is calculated by formula 7：
QWet CO2=QDry CO2×(1-1.85QSurvey/QDry air inlet) (6)
QWet CO=QDry CO×(1-1.85QSurvey/QDry air inlet) (7)
In formula, QAir inletIt is the butt value of air mass in the unit time；
D is air inlet water capacity；
P is experimental enviroment air pressure；
psIt is the corresponding saturated vapor air pressure of test ambient temperature；
The degree of saturation of water vapour content in expression humid air, referred to as relative humidity, are that stand humidity measuring device is surveyed
.
In the present invention, γCO2、γCO、γHCThe exhaust gas density obtained by experiment is determined；In GB 17691, will be vented
Density is defined as at 273K (0 DEG C), and under the conditions of 101.3KPa, density is 1.293kg/m3, exhaust analyzer is automatically according to the above
Standard is converted to determining numerical value.At 273K (0 DEG C), under the conditions of 101.3KPa, the density of CO2, CO, HC is respectively,
1.249kg/m3、1.963kg/m3、0.619kg/m3, thus it is calculated
By taking certain engine rig test as an example, the parameter that wet basis amendment is used, humidity is 49.8%, and temperature is 25.2
DEG C, air pressure is 101.9kPa, and this experiment fuel used is the diesel oil of state IV, the mass percentage content α of C in the diesel oilCFor
0.8533；On-test certain hour, after parameter stability, Q is measured in certain sampling time point by measuring apparatusAir inletFor
173.1222kg/hQSurveyIt is 7.34kg/h, αCOIt is 0.56ppm, αCO2It is 9.32%, αHCIt is 55.6ppm, is counted by formula 1 and 2
Calculation obtains gas leakage factor-beta=1.01, in the range of 1 ± 0.03, now occurs without gas leakage；After experiment carries out two hours, sampling
Measure QAir inletIt is 72.2kg/h, QSurveyIt is 2.05kg/h, αCOIt is 755.17ppm, αCO2It is 6.54% αHC235.9 is ppm, by public affairs
Formula 1 and 2 is calculated gas leakage factor-beta=1.09 ＞ 1.03, shows that inlet end leaks air and is checked, it is necessary to shut down.
Claims (9)
1. a kind of engine rig test intake and exhaust leak detection method, it is characterized in that：Established standardses deviation, using C equilbristats
The gas leakage factor is calculated, the gas leakage factor is 1 under the standard state entirely without gas leakage；The gas leakage factor is detected by measuring instrument and obtained
Using the supposition Fuel Consumption extrapolated into in-engine material total amount on C balance binding isotherms after C content in exhaust
With the ratio of the actual fuel consumption of Real-time Collection, when scope of the gas leakage factor beyond standard deviation, show there is gas leakage to show
As occurring, now：
Such as, thus it is speculated that Fuel Consumption ＞ actual fuel consumptions are then for air inlet side leaks air；
Such as, thus it is speculated that Fuel Consumption ＜ actual fuel consumptions are then for exhaust side leaks air.
2. engine rig test intake and exhaust leak detection method as claimed in claim 1, it is characterized in that：Established standardses deviation
It is ± 0.03, the gas leakage factor-beta is calculated by formula 1,
In formula, QCalculateIt is the supposition Fuel Consumption extrapolated using C balances in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time；
Now, such as gas leakage factor-beta ＞ 1.03, then show that air inlet side leaks air；
Now, such as gas leakage factor-beta ＜ 0.97, then show that exhaust side leaks air.
3. engine rig test intake and exhaust leak detection method as claimed in claim 2, it is characterized in that：It is described in unit
The actual fuel consumption Q of interior Real-time CollectionSurveyThe flow measurement carried by engine rig test system is measured.
4. engine rig test intake and exhaust leak detection method as claimed in claim 2, it is characterized in that：It is described in unit
The supposition Fuel Consumption Q that interior utilization C balances are extrapolatedCalculateIt is calculated by formula 2,
QCalculate=QCO2+QCO+QHC (2)
In formula, QCO2It is CO in the exhaust obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs within the unit interval2The corresponding Fuel Consumption of content；
QCOIt is the corresponding Fuel Consumption of CO contents in the exhaust obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs within the unit interval；
QHCIt is the corresponding Fuel Consumption of HC emissions content obtained by C EQUILIBRIUM CALCULATION FOR PROCESSs in the unit time.
5. engine rig test intake and exhaust leak detection method as claimed in claim 4, it is characterized in that：It is empty when air inlet is ignored
CO in gas2During content, QCO2It is calculated by formula 3,
In formula, αCTo test the mass percentage content of fuel used middle C；
αCO2CO in the exhaust obtained for measuring instrument detection2Volume fraction；
γCO2It is the CO in exhaust2Volume fraction is converted into the transformation ratio of mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of the Real-time Collection within the unit interval.
6. engine rig test intake and exhaust leak detection method as claimed in claim 5, it is characterized in that：The formula 3 is counted
The Q for obtainingCO2It is butt value, i.e. QDry CO2, also using humidity value to Q in this methodDry CO2It is modified and obtains QWet CO2Step
Suddenly,
QWet CO2=QDry CO2×(1-1.85QSurvey/QDry air inlet) (6)
In formula, QAir inletIt is the butt value of air mass in the unit time；
D is air inlet water capacity；
P is experimental enviroment air pressure；
psIt is the corresponding saturated vapor air pressure of test ambient temperature；
The degree of saturation of water vapour content in expression humid air, referred to as relative humidity, are that stand humidity measuring device is measured.
7. engine rig test intake and exhaust leak detection method as claimed in claim 4, it is characterized in that：The QCOBy formula
4 are calculated,
In formula, αCTo test the mass percentage content of fuel used middle C；
αCOThe volume fraction of CO in the exhaust obtained for measuring instrument detection；
γCOIt is transformation ratio that CO volume fractions in exhaust are converted into mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time.
8. engine rig test intake and exhaust leak detection method as claimed in claim 7, it is characterized in that：The formula 3 is counted
The Q for obtainingCOIt is butt value, i.e. QDry CO, also using humidity value to Q in this methodDry COIt is modified and obtains QWet COThe step of,
QWet CO=QDry CO×(1-1.85QSurvey/QDry air inlet) (7)
In formula, QAir inletIt is the butt value of air mass in the unit time；
D is air inlet water capacity；
P is experimental enviroment air pressure；
psIt is the corresponding saturated vapor air pressure of test ambient temperature；
The degree of saturation of water vapour content in expression humid air, referred to as relative humidity, are that stand humidity measuring device is measured.
9. engine rig test intake and exhaust leak detection method as claimed in claim 4, it is characterized in that：The QHCBy formula
5 are calculated,
QHC=γHC·αHC·(QAir inlet+QSurvey) (5)
In formula, αHCThe volume fraction of CO in the exhaust obtained for measuring instrument detection；
γHCIt is transformation ratio that HC volume fractions in exhaust are converted into mass fraction；
QAir inletIt is the air mass in the unit time；
QSurveyIt is the actual fuel consumption of Real-time Collection in the unit time.
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| CN113063898A (en) * | 2021-03-24 | 2021-07-02 | 中国大唐集团科学技术研究院有限公司中南电力试验研究院 | Thermal power station carbon emission monitoring method and system based on block chain |
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Application publication date: 20170613 |