CN115560984A - Method for correcting pneumatic parameters of fan component test outlet by considering intake distortion - Google Patents

Method for correcting pneumatic parameters of fan component test outlet by considering intake distortion Download PDF

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CN115560984A
CN115560984A CN202211057450.5A CN202211057450A CN115560984A CN 115560984 A CN115560984 A CN 115560984A CN 202211057450 A CN202211057450 A CN 202211057450A CN 115560984 A CN115560984 A CN 115560984A
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outlet
fan
distortion
parameters
probes
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陈劼
车杰先
王永明
叶巍
李泽玮
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AECC Sichuan Gas Turbine Research Institute
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AECC Sichuan Gas Turbine Research Institute
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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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
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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
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Abstract

The invention provides a method for correcting the pneumatic parameters of the outlet of a fan component test in consideration of intake distortion. The pneumatic parameters obtained by the method can accurately calculate the characteristics of the fan component such as pressure ratio, efficiency and the like under the condition of intake distortion, and provide data support for performance evaluation of the aircraft engine.

Description

Method for correcting pneumatic parameters of fan component test outlet by considering intake distortion
Technical Field
The invention belongs to the field of design of aero-engines, and particularly relates to a method for correcting pneumatic parameters of a test outlet of a fan component by considering intake distortion.
Background
The service environment of the aircraft engine is harsh, the fan component usually works in a distorted flow field with unevenly distributed inlet total pressure, and the average aerodynamic parameters such as outlet total pressure, total temperature and the like under inlet distortion need to be obtained in a fan component test. For the test of the fan component under the inlet distortion, a total pressure probe and a total temperature probe are required to be arranged on the cross section of the outlet so as to obtain the distribution conditions of pneumatic parameters such as the total pressure and the total temperature. In order to obtain the pneumatic parameter distribution of the outlet section of the fan component as accurately as possible, more measuring points are expected, but the influence of the probe on the airflow field is larger during multi-point measurement, so that an obvious blocking effect is generated. The 6-8 total pressure and total temperature composite probes are usually arranged at the outlet of the fan to obtain pneumatic parameters, and the influence of uneven distribution of the pneumatic parameters caused by the wake of the upstream fan blade and the inlet distortion cannot be comprehensively considered in the conventional measurement method. In journal analysis and correction of performance errors of fan inlet pressure distortion test (gas turbine test and research, 2017 (04): 16-22), the method for correcting the pneumatic parameters of the fan outlet under the inlet distortion only considers averaging along the circumferential direction, and although the influence of the inlet distortion is considered, the influence of the wake of the upstream blade cannot be considered. The method for measuring the outlet pneumatic parameters in the aviation industry standard aviation performance test method of the aviation gas turbine engine compressor (HB 7115-2020) of the people's republic of China only refers to the measurement by using at least six multipoint probes, and simultaneously considers the non-uniform factors along the grid pitch direction, namely the influence caused by the wake of the upstream blade, and fails to consider the non-uniform factors along the circumferential direction of the pneumatic parameters during the intake distortion test.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method for measuring and correcting the pneumatic parameters of the outlet of the fan component under the condition of intake distortion aiming at the comprehensive influence of circumferential non-uniformity caused by the wake of an upstream blade and intake distortion on the pneumatic parameters of the outlet of the fan component.
In order to achieve the above object, the present invention provides a method for correcting a test outlet aerodynamic parameter of a fan component in consideration of intake distortion, the method comprising the steps of:
s1: installing a plurality of measuring probes at the outlet position of the fan, wherein the positions of the plurality of measuring probes are determined according to the tail trace of the last stage stator blade and the inlet air distortion condition;
s2: carrying out multiple tests of the fan component under uniform flow under different outlet flow conditions, obtaining pneumatic parameters measured by a plurality of measuring probes, and forming a uniform flow database and a function relationship, wherein the function relationship is a function between the surface average pneumatic parameters of the fan outlet cross section under different outlet flow and the pneumatic parameters measured by the plurality of measuring probes;
s3: carrying out a fan component test under intake distortion to obtain pneumatic parameters measured by a plurality of measuring probes;
s4: and correcting the pneumatic parameters obtained in the step (3) according to the uniform flow database obtained in the step (2) and the functional relation to obtain the surface average pneumatic parameters of the outlet section of the fan component under the intake distortion.
The method for correcting the aerodynamic parameters of the outlet of the fan component test considering the intake distortion is also characterized in that the number of probes at the outlet position of the fan is not less than 6, the phase angle of each probe at the outlet position of the fan along the upstream last stage stator blade is different, the phase angle difference of two adjacent probes relative to the corresponding upstream last stage stator blade is the same, and at least 1 probe is positioned in the middle of the upstream last stage stator blade channel.
The method for correcting the pneumatic parameters of the test outlet of the fan component considering the intake distortion is also characterized in that at least 1 probe is arranged in any 90-degree sector at the outlet of the fan.
The method for correcting the aerodynamic parameters of the test outlet of the fan component considering the intake distortion, provided by the invention, is also characterized in that the average aerodynamic parameters of the surface of the cross section of the outlet of the fan flowing uniformly are as follows:
Figure BDA0003821544100000031
Figure BDA0003821544100000032
wherein, P i Total pressure at the outlet of the fan T under uniform flow i And (4) total temperature, wherein i represents the ith probe data, and n is the total number of the fan outlet probes.
The method for correcting the aerodynamic parameters of the test outlet of the fan component considering the intake distortion, provided by the invention, is further characterized in that the function relation in the S2 is as follows:
Figure BDA0003821544100000033
the method for correcting the aerodynamic parameters of the test outlet of the fan component considering the intake distortion is also characterized in that the correction in S4 comprises the following steps:
s4.1: according to the functional relation obtained from S2 and the total pressure P 'of the pneumatic parameter measured by a certain measuring probe under the distortion condition' i Total temperature T' i Calculating to obtain the average pneumatic parameters of the outlet of the passage between the leaves where the measuring probe is positioned
Figure BDA0003821544100000034
。
S4.2: calculating the surface average aerodynamic parameters of the outlet section of the fan component under the intake distortion according to the circumferential positions theta of the passages among the blades where the different probes are positioned,
Figure BDA0003821544100000041
wherein
Figure BDA0003821544100000042
θ n+1 ＝2π+θ 1
Figure BDA0003821544100000043
Wherein
Figure BDA0003821544100000044
θ n+1 ＝2π+θ 1 。
Advantageous effects
According to the method for correcting the pneumatic parameters of the outlet of the fan component test considering the intake distortion, provided by the invention, the circumferential positions of the outlet measuring probes are reasonably arranged, a database formed by the pneumatic parameters of the outlet of the fan component during the uniform flow test is constructed, the pneumatic parameters of the outlet of the fan are corrected during the intake distortion test, the circumferential nonuniformity of the pneumatic parameters caused by the intake distortion and the influence of the wake of the fan blade on the downstream can be captured, and more accurate average pneumatic parameters of the outlet surface of the fan are obtained. The pneumatic parameters obtained by the method can accurately calculate the characteristics of the fan component such as pressure ratio, efficiency and the like under the condition of intake distortion, and provide data support for performance evaluation of the aircraft engine.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for correcting fan component characteristics in consideration of intake distortion according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a layout of probes at the outlet of a fan under uniform flow and a calculation method;
FIG. 3 is a schematic diagram of a fan outlet probe layout and calculation method under intake distortion.
Detailed Description
The present invention is further described in detail with reference to the drawings and examples, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functional, methodological, or structural equivalents of these embodiments or substitutions may be included in the scope of the present invention.
In the description of the embodiments of the present invention, it should be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only used for convenience in describing and simplifying the description of the present invention, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality" means two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
As shown in fig. 1 to 3, an embodiment of the present invention provides a method for correcting a test outlet aerodynamic parameter of a fan component by taking intake distortion into account, where the method includes the following steps:
s1: installing a plurality of measuring probes at the outlet position of the fan, wherein the positions of the measuring probes are determined according to the tail trace of the last stage stator blade and the intake distortion condition;
s2: as shown in fig. 2, a plurality of tests of the fan component under uniform flow at different outlet flow rates are performed to obtain the aerodynamic parameters measured by a plurality of measurement probes, and a uniform flow database and a function relationship are formed, where the function relationship is a function between the surface average aerodynamic parameter of the fan outlet cross section and the aerodynamic parameters measured by a plurality of measurement probes at different outlet flow rates;
s3: developing a fan component test under intake distortion to obtain pneumatic parameters measured by a plurality of measuring probes; adjusting different sizes of intake distortion and different fan test conditions to obtain pneumatic parameters of each probe at the outlet of the fan under the intake distortion under different test conditions;
s4: and (3) correcting the pneumatic parameters obtained in the step (3) according to the uniform flow database obtained in the step (2) and the functional relation to obtain the surface average pneumatic parameters of the outlet section of the fan component under the intake distortion, as shown in the figure 3.
In some embodiments, the number of probes at the outlet position of the fan is not less than 6, the phase angle of each probe at the outlet position of the fan along the upstream last stage stator blade is different, the phase angle difference between two adjacent probes relative to the corresponding upstream last stage stator blade is the same, and at least 1 probe is located in the middle of the upstream last stage stator blade channel.
In some embodiments, at least 1 probe is arranged in any 90-degree sector at the outlet of the fan. To account for the effects of inlet distortion on the aerodynamic parameters of the fan outlet, the outlet probes should be distributed relatively evenly over each circumferential angle of the outlet.
In some embodiments, the surface average aerodynamic parameter of the outlet cross section of the fan under uniform flow is:
Figure BDA0003821544100000071
Figure BDA0003821544100000072
wherein, P i Total pressure at the outlet of the fan T under uniform flow i Total temperature, wherein i represents the data of the ith probe, n is the total number of the fan outlet probes, and alpha i The ith probe is in phase angle alpha relative to the upstream final stator blade i -α i-1 ＝α 1 -α n Is a constant value.
In some embodiments, the function relationship in S2 is:
Figure BDA0003821544100000073
in some embodiments, the correcting in S4 includes the following steps:
s4.1: according to the functional relation obtained by S2 and the total pressure P 'of the pneumatic parameter measured by a certain measuring probe under the distortion condition' i Total warm of T' i Calculating to obtain the average pneumatic parameters of the outlet of the passage between the leaves where the measuring probe is positioned
Figure BDA0003821544100000074
S4.2: calculating the surface average aerodynamic parameters of the outlet section of the fan component under the intake distortion according to the circumferential positions theta of the passages among the blades where the different probes are positioned,
Figure BDA0003821544100000075
wherein
Figure BDA0003821544100000076
θ n+1 ＝2π+θ 1
Figure BDA0003821544100000077
Wherein
Figure BDA0003821544100000078
θ n+1 ＝2π+θ 1 。
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and those improvements and modifications should be also considered as the protection scope of the present invention.

Claims (6)

1. A method of correcting trial outlet aerodynamic parameters of a fan assembly to account for inlet air distortion, the method comprising the steps of:
s1: installing a plurality of measuring probes at the outlet position of the fan, wherein the positions of the plurality of measuring probes are determined according to the tail trace of the last stage stator blade and the inlet air distortion condition;
s2: carrying out multiple tests of uniformly flowing down the fan component under different outlet flow conditions, obtaining pneumatic parameters measured by a plurality of measuring probes, and forming a uniform flow database and a function relation, wherein the function relation is a function between the surface average pneumatic parameters of the fan outlet cross section under different outlet flow and the pneumatic parameters measured by the plurality of measuring probes;
s3: developing a fan component test under intake distortion to obtain pneumatic parameters measured by a plurality of measuring probes;
s4: and (4) correcting the pneumatic parameters obtained in the step (3) according to the uniform flow database and the functional relation obtained in the step (2) to obtain the surface average pneumatic parameters of the outlet section of the fan component under the intake distortion.
2. The intake distortion-considered method for correcting aerodynamic parameters of a test outlet of a fan unit according to claim 1, wherein the number of probes at the outlet position of the fan is not less than 6, the phase angle of each probe at the outlet position of the fan along the upstream final stator blade is different from each other, the phase angle difference between two adjacent probes with respect to the corresponding upstream final stator blade is the same, and at least 1 probe is located at the middle position of the upstream final stator blade passage.
3. The inlet distortion considered fan assembly test outlet aerodynamic parameter correction method of claim 2, wherein at least 1 probe is provided in any 90 degree sector at the fan outlet.
4. The intake distortion considering fan component test outlet aerodynamic parameter correction method as claimed in claim 1, wherein the surface average aerodynamic parameter of the uniform flow down fan outlet cross section is:
Figure FDA0003821544090000021
Figure FDA0003821544090000022
wherein, P i Total pressure at the outlet of the fan, T i And (4) total temperature, wherein i represents the ith probe data, and n is the total number of the fan outlet probes.
5. The inlet distortion considered fan component test characteristic outlet aerodynamic parameter correction method of claim 4, wherein the function relationship in S2 is:
Figure FDA0003821544090000023
6. the method of correcting trial outlet aerodynamic parameters of a fan component taking intake air distortion into account as claimed in claim 1, wherein the correcting in S4 comprises the steps of:
s4.1: according to the functional relation obtained from S2 and the total pressure P 'of the pneumatic parameter measured by a certain measuring probe under the distortion condition' i Total warm of T' i Calculating to obtain the average pneumatic parameters of the outlet of the passage between leaves where the measuring probe is located
Figure FDA0003821544090000024
S4.2: calculating the surface average aerodynamic parameters of the outlet section of the fan component under the intake distortion according to the circumferential positions theta of the passages among the blades where the different probes are positioned,
Figure FDA0003821544090000025
wherein
Figure FDA0003821544090000026
θ n+1 ＝2π+θ 1
Figure FDA0003821544090000027
Wherein
Figure FDA0003821544090000028
θ n+1 ＝2π+θ 1 。
CN202211057450.5A 2022-08-29 2022-08-29 Method for correcting pneumatic parameters of fan component test outlet by considering intake distortion Pending CN115560984A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116658451A (en) * 2023-08-02 2023-08-29 中国航发四川燃气涡轮研究院 Method for correcting total pressure of outlet of air compressor in core machine environment based on wake loss

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116658451A (en) * 2023-08-02 2023-08-29 中国航发四川燃气涡轮研究院 Method for correcting total pressure of outlet of air compressor in core machine environment based on wake loss
CN116658451B (en) * 2023-08-02 2023-10-03 中国航发四川燃气涡轮研究院 Method for correcting total pressure of outlet of air compressor in core machine environment based on wake loss

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