CN112033681B - Afterburner outlet temperature error correction method - Google Patents
Afterburner outlet temperature error correction method Download PDFInfo
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- CN112033681B CN112033681B CN202010756288.0A CN202010756288A CN112033681B CN 112033681 B CN112033681 B CN 112033681B CN 202010756288 A CN202010756288 A CN 202010756288A CN 112033681 B CN112033681 B CN 112033681B
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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
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
- G01K13/02—Thermometers specially adapted for specific purposes for measuring temperature of moving fluids or granular materials capable of flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/005—Calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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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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- Combustion & Propulsion (AREA)
- Testing Of Engines (AREA)
Abstract
The invention discloses a method for correcting the temperature error of an afterburner outlet, which utilizes computer simulation to obtain the dense flow distribution of the afterburner outlet and the average value of the dense flow of each ring surface, takes the dense flow as the weight factor of the outlet average temperature, considers the difference caused by the nonuniform distribution of the dense flow of the afterburner outlet, can correct the error of the afterburner due to the nonuniform distribution of the dense flow of the outlet, improves the data reliability compared with the original data processing method, and further achieves the aim of accurately judging the combustion efficiency of the afterburner.
Description
Technical Field
The invention belongs to the test technology of an aircraft engine, and relates to a correction method of afterburner outlet temperature test errors.
Background
In afterburner component testing, the results of afterburner outlet temperature testing are important parameters in evaluating afterburner combustion efficiency. The heat quantity when the combustion efficiency is calculated is measured according to the mass, so the weighted average of the outlet average temperature of the afterburner according to the mass flow has corresponding physical significance, wherein the afterburner test generally comprises a full-circle test and a sector test. The temperature of the outlet of the afterburner is generally measured by adopting a temperature measuring sensing head or a rotary temperature measuring device, and because temperature measuring points are arranged along the radial direction according to an isotorus, the average temperature is the arithmetic average value of the temperature of the measuring points under the assumption that outlet dense flow is uniformly distributed. However, the data testing and processing method is more suitable for the turbojet afterburner or the small bypass afterburner. For the afterburner with the medium bypass ratio, the dense flow distribution unevenness at the outlet of the afterburner is large due to the influences of large combustion area, large external bypass mass flow ratio, uneven temperature distribution and the like of the afterburner. If the average afterburner outlet temperature is still arithmetically averaged over the measured temperature at this time, a large error will occur.
Disclosure of Invention
The purpose of the invention is: the method for correcting the outlet temperature error of the afterburner based on the dense flow distribution can correct the error of the afterburner caused by uneven outlet dense flow distribution, and improves the data reliability compared with the original data processing method so as to accurately evaluate the combustion efficiency of the afterburner.
The technical solution of the invention is as follows:
a method for correcting afterburner outlet temperature errors comprises the following steps:
step 1, determining a dense flow average value: simulating the dense flow field distribution of the combustion field outlet of the afterburner, dividing the flow field section of the afterburner outlet according to the equal ring surfaces according to the radial measuring point distribution of an actual combustion test, and obtaining the dense flow average value of each equal ring surface of the afterburner outlet according to a mass weighted average method;
step 2, obtaining temperature measurement values of a plurality of points on each equal ring surface of an outlet in the working state of the afterburner through afterburner tests;
step 3, carrying out arithmetic mean on the temperature measurement data on each equal ring surface of the afterburner outlet obtained in the step 2 to obtain the average temperature of each equal ring surface of the afterburner outlet;
and 4, taking the dense flow average value of each isotorus of the afterburner outlet obtained in the step 1 as the weight of the corresponding torus, and combining the average temperature of each isotorus of the afterburner outlet obtained in the step 3 to perform weighted average on the temperature of each torus of the afterburner outlet to obtain the average temperature of the afterburner outlet.
Preferably, in the step 1, the dense flow field distribution at the outlet of the combustion field of the afterburner is simulated through three-dimensional CFD simulation.
Preferably, in the step 1, the cross section of the afterburner outlet flow field is divided according to the equal ring surface according to the positions of the measuring points distributed along the radial direction of the temperature measuring sensing heads and the number of the measuring points.
Preferably, in step 1, the dense flow average value of each isotorus of the outlet of the afterburner is obtained through three-dimensional CFD simulation.
Preferably, in step 2, the temperature measurement value is measured by a rotary temperature measuring device or a fixed thermocouple.
Preferably, the calculation in step 4 is as follows:
is the average value of the dense flow of each isotorus at the outlet of the afterburner,
in order to enhance the average temperature at the outlet of the combustion chamber,
is the arithmetic mean temperature on the ith annulus.
Preferably, in the step 2, when the fixed thermocouples are used for measurement, at least four fixed thermocouples are uniformly distributed at the circumferential direction of the combustion field outlet of the afterburner.
Preferably, the method is applicable to an afterburner with a medium bypass ratio, which means a bypass ratio greater than 1. The medium bypass ratio afterburner has smaller outlet flow field unevenness in a working state and is larger than the afterburner, so that the direct processing of the average temperature of the afterburner outlet brings larger error and further influences the judgment of the combustion efficiency. The heat calculated by the combustion efficiency is measured according to the mass, so that the weighted average of the outlet average temperature of the afterburner according to the mass flow has corresponding physical significance, and the influence caused by the non-uniform dense flow is considered by adopting the temperature after dense flow correction.
The invention has the advantages that: the method can correct errors caused by uneven outlet dense flow distribution of the afterburner, improves data reliability compared with the original data processing method, and further achieves the purpose of accurately judging the combustion efficiency of the afterburner.
Drawings
FIG. 1 is a schematic view of a certain engine afterburner outlet (low boost condition) closing flow ratio contour line.
FIG. 2 is a schematic diagram of a certain engine afterburner outlet (fully energized state) dense flow ratio contour line.
FIG. 3 is a schematic layout diagram of a rotary temperature measuring point of an afterburner outlet section.
Detailed Description
The present invention is described in further detail below.
A method for correcting the temperature error of an afterburner outlet based on dense flow distribution comprises the following steps:
step 1: carrying out three-dimensional CFD simulation on dense flow field distribution of an afterburner combustion field outlet through a computer, and dividing the afterburner outlet flow field section according to an equal ring surface according to the positions or the quantity of measuring points of the temperature measuring sensing heads distributed along the radial direction; according to the mass weighted average method, the dense flow average value of each isotorus of the outlet of the afterburner is obtained by CFD software;
step 2: the method comprises the steps of obtaining temperature measurement values of m points on each isotorus of an outlet under the working state of the afterburner through afterburner tests, generally measuring the temperature measurement values through a rotary temperature measuring device or a fixed thermocouple, and dividing the outlet flow field section of the afterburner in simulation calculation into n isotories according to the isotorus by knowing measuring point positions R distributed along the radial direction of a temperature measuring sensing head (or the fixed thermocouple) of the rotary temperature measuring device, wherein the n isotories are shown in figure 3; and according to the method of mass weighted average, the dense flow average value of each isotorus at the outlet of the afterburner is obtained by CFD software;
and 3, step 3: carrying out arithmetic averaging on the temperature measurement data on each isotorus of the outlet of the afterburner to obtain the arithmetic average temperature of each isotorus of the outlet of the afterburner;
and 4, step 4: taking the average value of the dense flow of each ring surface obtained in the step 2 as the weight of the ring surface, combining the average temperature of each ring surface obtained in the step 4, carrying out weighted average on the temperature of each ring surface of the afterburner outlet to obtain the average temperature of the afterburner outlet, namely the average temperature of the afterburner outlet is calculated according to a formula
Performing calculation of the formulaThe index i is the ith annulus,
in order to enhance the average temperature at the outlet of the combustion chamber,
as the mean value of the dense flow on the ith torus (obtained in step 2),
the arithmetic mean temperature on the ith annulus (obtained in step 3).
The principle of the method is as follows: generally, when the average temperature of the outlet of the afterburner is processed, a method of arranging temperature measuring points on an isotorus is adopted for testing, and then arithmetic average is carried out on temperature measuring data. Due to the fact that the outlet dense flow distribution unevenness is large, the method can generate large errors aiming at the afterburner with the medium bypass ratio, and the obtained data do not have corresponding physical significance. The method utilizes computer simulation to obtain the dense flow distribution of the outlet of the afterburner and the average value of the dense flow of each ring surface, takes the dense flow as the weight factor of the average temperature of the outlet, takes the difference caused by the non-uniform distribution of the dense flow at the outlet of the afterburner into consideration, corrects the error caused by the non-uniform distribution of the dense flow at the outlet of the afterburner, and improves the data reliability compared with the original data processing method.
Examples
A method for correcting afterburner outlet temperature errors based on dense flow distribution comprises the following steps:
step 1: and (3) carrying out three-dimensional CFD simulation on the dense flow field distribution of the combustion field outlet of the afterburner by using a computer, wherein the dense flow ratio in the graph 1 and the graph 2 is the ratio of the dense flow value of the point to the surface dense flow average value, as shown in the graph 1 and the graph 2. FIG. 1 is a dense flow ratio distribution cloud chart of an outlet in a small stress state of an afterburner of a certain type of engine, FIG. 2 is a dense flow ratio distribution cloud chart of an outlet in a full stress state of an afterburner of a certain type of engine, and a simulation calculation process is not specifically described here;
step 2: measuring points distributed along radial direction of temperature measuring sensing head (or fixed thermocouple) of known rotary temperature measuring deviceThe position R is used for dividing the cross section of an afterburner outlet flow field in simulation calculation into 6 isoannuli according to the isoannuli, as shown in figure 3; and according to the method of mass weighted average, the dense flow average value of each isotorus of the outlet of the afterburner is obtained by CFD software
The temperature measurement values of 6 points along the radial direction on each isotorus of an outlet under the working state of the afterburner are obtained through afterburner tests, and are mainly measured through a rotary temperature measuring device or a fixed thermocouple, as shown in figure 3, the temperature measurement process is not described here;
and 3, step 3: in the example, the temperature of the sensor head of the outlet section rotating temperature measuring device is measured once per 10 degrees of rotation, namely, 36 data are arranged on each ring surface per one rotation, the temperature measuring data on the same ring surface of the outlet of the afterburner is arithmetically averaged to obtain the arithmetically averaged temperature of each ring surface of the outlet of the afterburner
And 4, step 4: averaging the dense flow of each ring obtained in the step 2
Combining the average temperature of each ring surface obtained in step 3 as the weight of the ring surface
The weighted average is carried out on the temperature of each ring surface of the outlet of the afterburner to obtain the average temperature of the outlet of the afterburner, namely the average temperature of the outlet of the afterburner is calculated according to a formula
Calculating, wherein the corner mark i is the ith ring surface,
in order to enhance the average temperature at the outlet of the combustion chamber,
is the dense flow average on the ith annulus (obtained in step 2),
the arithmetic mean temperature on the ith annulus (obtained in step 3).
The above-mentioned embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and to implement it accordingly, and not to limit the protection scope of the present invention by this, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (8)
1. A method for correcting the temperature error of an afterburner outlet is characterized by comprising the following specific steps of:
step 1, determining a dense flow average value: simulating the dense flow field distribution of the combustion field outlet of the afterburner, dividing the flow field section of the afterburner outlet according to the equal ring surfaces according to the radial measuring point distribution of an actual combustion test, and obtaining the dense flow average value of each equal ring surface of the afterburner outlet according to a mass weighted average method;
step 2, obtaining temperature measurement values of a plurality of points on each isotorus of an outlet under the working state of the afterburner through afterburner tests;
step 3, performing arithmetic mean on the temperature measured values of the afterburner outlet isotorus obtained in the step 2 to obtain the average temperature of the afterburner outlet isotorus;
and 4, taking the dense flow average value of each isotorus of the afterburner outlet obtained in the step 1 as the weight of the corresponding isotorus, combining the average temperature of each isotorus of the afterburner outlet obtained in the step 3, and carrying out weighted average on the temperature of each isotorus of the afterburner outlet to obtain the average temperature of the afterburner outlet.
2. The method for correcting afterburner outlet temperature errors as in claim 1, wherein the dense flow field distribution at the afterburner outlet is simulated in step 1 by three-dimensional CFD simulation.
3. The afterburner outlet temperature error correction method as defined in claim 1, wherein in step 1, the afterburner outlet flow field cross section is divided into an isotorus according to the positions and the number of measuring points of the temperature measuring heads distributed along the radial direction.
4. The method for afterburner outlet temperature error correction of claim 1, wherein the dense flow average of each isotorus of the afterburner outlet is determined in step 1 by three-dimensional CFD simulation.
5. The method for afterburner outlet temperature error correction of claim 1, wherein the temperature measurements in step 2 are taken by rotating thermometers or fixed thermocouples.
6. The method for afterburner outlet temperature error correction of claim 1, wherein step 4 is calculated as follows:
is the average value of the dense flow of each isotorus at the outlet of the afterburner,
in order to enhance the average temperature at the outlet of the combustion chamber,
is the arithmetic mean temperature on the ith isocycloid, i is the ith isocycloid, n is the sumThe cross section of the outlet flow field of the force combustion chamber is divided into n equal ring surfaces according to the equal ring surfaces.
7. The method for afterburner outlet temperature error correction of claim 5, wherein in step 2, when using fixed thermocouples for measurement, at least four fixed thermocouples are evenly distributed circumferentially at the afterburner combustion field outlet.
8. A method of afterburner outlet temperature error correction as in any one of claims 1 to 7, wherein the method is applicable to afterburners with medium bypass ratios, with medium bypass ratio being a bypass ratio greater than 1.
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| CN114739458B (en) * | 2022-04-18 | 2023-11-03 | 中国航发沈阳发动机研究所 | Dual-channel high-temperature measurement structure for simulating afterburner inlet flow field |
| CN116796666B (en) * | 2023-08-21 | 2023-11-07 | 中国航发上海商用航空发动机制造有限责任公司 | Axial-flow compressor measuring point arrangement method |
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