CN115144058A - Detection method of oil injection device - Google Patents
Detection method of oil injection device Download PDFInfo
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- CN115144058A CN115144058A CN202210753215.5A CN202210753215A CN115144058A CN 115144058 A CN115144058 A CN 115144058A CN 202210753215 A CN202210753215 A CN 202210753215A CN 115144058 A CN115144058 A CN 115144058A
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- nozzle
- fuel
- flow
- unit time
- fuel injection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
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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
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a detection method of a fuel injection device, which comprises the steps of firstly measuring the flow of a fuel nozzle in unit time, then calibrating the flow in unit time by adopting real-time temperature to keep the obtained flow value the same as the measurement condition of a standard flow value, then calculating a deviation value according to the calibrated flow and the standard flow, and finally confirming the state of the fuel nozzle according to the deviation value.
Description
Technical Field
The invention relates to the field of calibration of an aircraft engine combustion chamber fuel nozzle tester, in particular to a detection method of an oil injection device.
Background
The combustion chamber is one of the key parts of the aero-engine, has the characteristics of small size, high internal flow rate and short fuel retention time, and has strict requirements on fuel atomization quality. The aviation fuel nozzle is used for preliminarily processing liquid fuel to break the liquid fuel into a plurality of fine oil drops, sending the fine oil drops into a flame tube in a combustion chamber at a certain angle and flow rate, and uniformly mixing the fine oil drops with air in the flame tube to form a combustible oil-gas mixture so as to prepare for the next combustion reaction. The aviation fuel nozzle is required to stably, accurately and reliably input a certain amount of fuel into a combustion chamber according to the working state of an engine, ensure good atomization quality and a certain spray angle in a larger working range and ensure proper oil-gas concentration distribution. Therefore, the fuel nozzle plays an important role in atomizing liquid fuel, directly influences the atomization and distribution of the fuel, and has direct influence on flame stabilization and engine performance.
The flow of the fuel nozzle can deviate after a period of time, and the performance of the fuel nozzle is affected, so that the flow of the fuel nozzle needs to be detected and calibrated, and the existing detection method is complex in operation and poor in accuracy.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a detection method of a fuel injection device, which realizes the quick and accurate detection of a fuel nozzle.
The invention is realized by the following technical scheme:
a method of testing a fuel injection device, comprising the steps of:
and 3, determining the state of the fuel nozzle according to the flow value of the fuel nozzle under the set temperature and pressure and the flow value of the standard fuel nozzle.
Preferably, the fuel injection nozzle includes a secondary nozzle and a primary nozzle.
Preferably, in step 1, the flow rate of the fuel nozzle in unit time includes the flow rate of the secondary nozzle in unit time and the flow rate of the combined nozzle composed of the secondary nozzle and the main nozzle in unit time.
Preferably, the set pressure for measuring the flow rate of the secondary nozzle is 3 to 4Mpa.
Preferably, the set pressure when the combined nozzle is measured is 5-6Mpa.
Preferably, the method for measuring the flow rate of the fuel nozzle in the unit time in the step 1 is as follows:
and a flowmeter is arranged on a pipeline of the fuel nozzle, and the total amount of the liquid is obtained according to the flowmeter and is combined with the fuel injection time to calculate the flow of the fuel nozzle in unit time.
Preferably, the method for correcting the flow rate of the fuel nozzle in the unit time in the step 2 is as follows:
wherein Q is the flow in unit time, T = T2-T1, T2 is the fuel oil temperature at the fuel nozzle inlet, and T1 is the fuel oil temperature at the fuel nozzle inlet.
Preferably, in step 3, the flow deviation is determined according to the flow value of the fuel nozzle under the set temperature and pressure and the flow value of the standard fuel nozzle, and the state of the fuel nozzle is determined according to the flow deviation.
Preferably, the flow deviation Δ Q is calculated as follows:
where Qx is the corrected flow and Qgc is the flow value of the standard fuel nozzle.
Preferably, when the flow deviation is smaller than the set deviation value in step 3, the fuel nozzle is in a normal state.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a detection method of a fuel injection device, which comprises the steps of firstly measuring the flow of a fuel nozzle in unit time, then calibrating the flow in unit time by adopting real-time temperature, keeping the obtained flow value the same as the measurement condition of a standard flow value, then calculating a deviation value according to the calibrated flow and the standard flow, and finally confirming the state of the fuel nozzle according to the deviation value.
Drawings
FIG. 1 is a block diagram of a fuel injector of the present invention;
FIG. 2 is a block diagram of a primary nozzle of the present invention;
FIG. 3 is a structural view of a secondary nozzle of the present invention;
FIG. 4 is a block diagram of the oil distribution base of the present invention;
FIG. 5 is a flow chart of a fuel injector detection method of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Referring to fig. 1-4, the fuel nozzle detected by the invention comprises a nozzle shell 1, an oil distribution base 2, an auxiliary nozzle 3, a main nozzle 4 and an air cap 5; the oil distribution base 2 is arranged at the end part of the nozzle shell 1, the auxiliary nozzle 3 and the main nozzle 4 are both arranged at the end part of the oil distribution base 2, and the air cap 5 covers the auxiliary nozzle 3 and the main nozzle 4 and is connected with the nozzle shell 1.
Referring to fig. 2, a method for detecting a fuel injection apparatus includes the following steps:
Specifically, in the present example, jet fuel No. 3 (RP-3) was used as the test fuel. Before testing, performance indexes of the test fuel oil are detected, the test fuel oil is ensured to meet the detection requirements of the fuel nozzle, and the performance indexes comprise the density, the viscosity and the actual colloid of the fuel oil.
And 2, acquiring the flow Qf of the auxiliary nozzle of the fuel nozzle in unit time under the set pressure.
Specifically, the set pressure is 3 to 4MPa, preferably 3.5MPa.
When the flow rate of the auxiliary nozzle is measured, the pressure is controlled, when the pressure is overlarge, the auxiliary nozzle and the main nozzle are simultaneously sprayed with oil, so that the set pressure is 3.5Mpa, the auxiliary nozzle sprays oil, the main nozzle does not spray oil, the oil spraying amount of the auxiliary nozzle in the set time is measured, and then the flow rate of the auxiliary nozzle in unit time is determined.
For example, a flow meter is arranged on a pipeline of the fuel nozzle, then the fuel injection time is controlled, the total amount of liquid is obtained according to the flow meter, and the flow rate of the secondary nozzle in unit time can be calculated when the total amount of liquid is combined.
And 3, acquiring the flow rate Qz of the combined nozzle of the fuel nozzle under the set pressure in unit time.
The combined nozzle is a main nozzle and an auxiliary nozzle of the fuel nozzle, oil injection is simultaneously opened, the set pressure is 5-6Mpa, preferably 5.5Mpa, and the measuring method of the combined nozzle is the same as that of the auxiliary nozzle in the step 2 in the flow rate in unit time, and is not described in detail.
And 4, correcting the flow value of the auxiliary nozzle obtained in the step 2 according to the fuel temperature to obtain the flow value of the auxiliary nozzle under the set temperature and pressure.
Specifically, the flow rate is corrected by using the following sub-nozzle flow rate correction formula in consideration of the influence of the density of the fuel and the temperature difference between the inlet and the outlet of the fuel on the flow rate.
Corrected secondary nozzle flow rate:
T＝T2-T1
t2: outlet fuel oil temperature (at nozzle inlet).
T1: inlet fuel oil temperature (at the inlet of the flow meter).
And 5, correcting the flow value of the combined nozzle obtained in the step 3 according to the fuel temperature to obtain the flow value of the combined nozzle under the set temperature and pressure.
Considering the influence of the density of the fuel and the temperature difference of the fuel inlet and the fuel outlet on the flow, the flow correction is carried out by adopting the following combined nozzle flow correction formula.
Corrected combined nozzle flow:
T＝T2-T1
t2: outlet fuel oil temperature (at nozzle inlet).
T1: inlet fuel oil temperature (at the inlet of the flow meter).
And 6, determining the state of the auxiliary nozzle according to the flow value of the auxiliary nozzle under the set temperature and pressure and the flow value of the standard auxiliary nozzle obtained in the step 4.
And comparing the corrected flow value of the auxiliary nozzle with the flow value Qfgc of the standard auxiliary nozzle, wherein the flow deviation delta Qf is within a set flow deviation range delta xi, when the flow deviation delta Qf is smaller than or equal to the set flow deviation range delta xi, the state of the auxiliary nozzle is normal, otherwise, the state is abnormal, and maintenance or replacement is needed.
And 6, determining the state of the combined nozzle according to the flow value of the combined nozzle and the flow value of the standard combined nozzle under the set temperature and pressure obtained in the step 5.
And comparing the corrected flow value of the combined nozzle with the flow value Qzgc of the standard auxiliary nozzle, wherein the flow deviation delta Qz is within a set flow deviation range delta 1 xi, when the flow deviation delta Qz is smaller than or equal to the set flow deviation range delta xi, the state of the auxiliary nozzle is normal, otherwise, the state is abnormal, and maintenance or replacement is required.
Example 1
A method of testing a fuel injection device, comprising the steps of:
And 2, measuring the flow rate Qz of the combined nozzle of the fuel nozzles under the set pressure in unit time.
And 4, correcting the flow value of the auxiliary nozzle obtained in the step 2 according to the fuel temperature to obtain the flow value of the auxiliary nozzle under the set temperature and pressure.
Corrected secondary nozzle flow rate:
T＝T2-T1＝23-18＝5℃
and 4, correcting the flow value of the combined nozzle obtained in the step 2 according to the fuel temperature to obtain the flow value of the combined nozzle under the set temperature and pressure.
Corrected combined nozzle flow:
T＝T2-T1＝23-18＝5℃
and 5, correcting the flow value of the combined nozzle obtained in the step 3 according to the fuel temperature to obtain the flow value of the combined nozzle under the set temperature and pressure.
And 6, determining the state of the auxiliary nozzle according to the flow value of the auxiliary nozzle and the flow value of the standard auxiliary nozzle under the set temperature and pressure obtained in the step 4.
After the combined nozzle flow rate is measured by the test, the combined nozzle flow rate deviation is checked.
Comparing the actually corrected flow value measured this time with a nominal flow value (Qzgc), wherein the flow deviation is within a reasonable range, the deviation cannot be too large, and if the deviation is too large, the abnormality of the tester is suspected.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A method for testing a fuel injection system, comprising the steps of:
step 1 acquiring the flow of a fuel nozzle in unit time under set pressure;
step 2, correcting the flow of the fuel nozzle in unit time according to the fuel temperature to obtain the fuel nozzle flow value under set temperature and pressure;
and 3, determining the state of the fuel nozzle according to the flow value of the fuel nozzle under the set temperature and pressure and the flow value of the standard fuel nozzle.
2. The method of claim 1, wherein the fuel injector includes a secondary injector and a primary injector.
3. The method for detecting a fuel injection device according to claim 2, wherein the step 1 includes obtaining the flow rate of the fuel injection nozzle in unit time, including the flow rate of the secondary nozzle in unit time and the flow rate of the combined nozzle composed of the secondary nozzle and the main nozzle in unit time.
4. The method of claim 3, wherein the set pressure for the secondary nozzle flow measurement is 3-4Mpa.
5. The method of claim 3, wherein the set pressure for the combined nozzle is 5-6Mpa.
6. A method for testing a fuel injection device according to claim 1, characterized in that the flow rate of the fuel injection nozzle per unit time in step 1 is measured as follows:
and a flowmeter is arranged on a pipeline of the fuel nozzle, and the total amount of the liquid is obtained according to the flowmeter and is combined with the fuel injection time to calculate the flow of the fuel nozzle in unit time.
7. A method of testing a fuel injection system according to claim 1, wherein the flow rate of the fuel injector per unit time in step 2 is corrected by:
wherein Q is the flow in unit time, T = T2-T1, T2 is the fuel oil temperature at the fuel nozzle inlet, and T1 is the fuel oil temperature at the fuel nozzle inlet.
8. The method of testing a fuel injection apparatus of claim 1, wherein in step 3, the flow deviation is determined based on the flow value of the fuel injector at the set temperature and pressure and the flow value of the standard fuel injector, and the condition of the fuel injector is determined based on the flow deviation.
9. The method for testing an oil injection device according to claim 8, characterized in that the flow deviation Δ Q is calculated as follows:
where Qx is the corrected flow and Qgc is the flow value of the standard fuel nozzle.
10. The fuel injection apparatus testing method of claim 8, wherein in step 3, when the flow deviation is smaller than the predetermined deviation value, the fuel injection nozzle is in a normal state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210753215.5A CN115144058A (en) | 2022-06-29 | 2022-06-29 | Detection method of oil injection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210753215.5A CN115144058A (en) | 2022-06-29 | 2022-06-29 | Detection method of oil injection device |
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| Publication Number | Publication Date |
|---|---|
| CN115144058A true CN115144058A (en) | 2022-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210753215.5A Pending CN115144058A (en) | 2022-06-29 | 2022-06-29 | Detection method of oil injection device |
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| CN (1) | CN115144058A (en) |
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2022
- 2022-06-29 CN CN202210753215.5A patent/CN115144058A/en active Pending
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