CN113361081B - Method for determining pneumatic area of afterburner chamber culvert with flow guide support plate - Google Patents

Method for determining pneumatic area of afterburner chamber culvert with flow guide support plate Download PDF

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CN113361081B
CN113361081B CN202110561666.4A CN202110561666A CN113361081B CN 113361081 B CN113361081 B CN 113361081B CN 202110561666 A CN202110561666 A CN 202110561666A CN 113361081 B CN113361081 B CN 113361081B
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culvert
area
determining
ratio
flow
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CN113361081A (en
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马宏宇
程荣辉
姜雨
曹茂国
徐兴平
刘宝
刘伟琛
陈伟博
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AECC Shenyang Engine Research Institute
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K3/00—Plants including a gas turbine driving a compressor or a ducted fan
    • F02K3/02—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber
    • F02K3/04—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type
    • F02K3/06—Plants including a gas turbine driving a compressor or a ducted fan in which part of the working fluid by-passes the turbine and combustion chamber the plant including ducted fans, i.e. fans with high volume, low pressure outputs, for augmenting the jet thrust, e.g. of double-flow type with front fan
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids

Abstract

The application belongs to the field of design of aircraft engines, and relates to a method for determining the pneumatic area of an afterburner culvert with a flow guide support plate. The method comprises the following steps: step S1, carrying out external culvert gas flow calculation on the flow of external culvert gas in the afterburner and a plurality of gas path zones mixed with the internal culvert gas, and determining the external culvert gas flow ratio of each zone; step S2, determining the geometric area ratio of each partition characteristic section; step S3, determining a pneumatic area correction coefficient of the culvert according to the airflow ratio and the geometric area ratio of the culvert; and step S4, calculating the pneumatic area of the culvert according to the pneumatic area correction coefficient of the culvert. The application provides a method suitable for calculating the pneumatic area of the afterburner chamber with the flow guide support plate aiming at the characteristics of the afterburner chamber with the flow guide support plate, and solves the problems that the pneumatic area of the afterburner chamber with the flow guide support plate is complex to calculate and inaccurate to calculate.

Description

Method for determining pneumatic area of afterburner chamber culvert with flow guide support plate
Technical Field
The application belongs to the field of design of aircraft engines, and particularly relates to a method for determining the pneumatic area of an afterburner outdoor culvert with a flow guide support plate.
Background
Shelters from high temperature turbine blade, can effectively improve turbofan engine's infrared stealthy performance backward. The turbine blades can be shielded by arranging a stealth flow guide support plate in the afterburner and air-cooling the afterburner. The air-cooled diversion support plate is arranged in the afterburner, the outer culvert air is required to be guided to cool the afterburner, the flowing condition of the outer culvert air becomes more complex, and the calculation difficulty of the outer culvert pneumatic area is greatly increased. The method for calculating the bypass aerodynamic area adopted in the existing afterburner design is not suitable for the afterburner.
The traditional three-generation afterburners generally have obvious mixing cross sections of the outer contained airflow or definite confluence points, and the calculation of the outer contained aerodynamic area of the afterburners is relatively simple and clear. Before the invention, the calculation of the pneumatic area of the outer culvert is relatively complicated, namely a hybrid diffusion and oil injection stabilization integrated afterburner, the afterburner adopts a balanced static pressure conversion algorithm to calculate the pneumatic area of the outer culvert, divides the airflow of the outer culvert into 3 flow paths, selects a flow which has the highest air volume ratio and is directly mixed with the air of the inner culvert to calculate the balanced static pressure of the airflow and the air of the inner culvert, and then respectively calculates the pneumatic area of each flow by utilizing the balanced static pressure, and the pneumatic area of the outer culvert can be obtained after the sum.
For an afterburner with a flow guide support plate, the proportion of the outer culvert airflow directly mixed with the inner culvert air in the whole outer culvert air is relatively small, and it is obviously not suitable to continue to calculate the balance static pressure by using the airflow and calculate the total outer culvert pneumatic area by the calculation. The mixing process of one air flow (air flow in a cooling channel of the heat shield) which occupies the largest proportion of the outer culvert air and the inner culvert air is continued from the inlet of the afterburner to the outlet of the afterburner, so that the balance static pressure conversion and the calculation of the pneumatic area of the outer culvert cannot be carried out based on the air flow. That is to say, at present, no method capable of guiding calculation of the afterburner culvert aerodynamic area with the flow guide support plate exists.
Disclosure of Invention
In order to solve the problems, the application provides a method which can be suitable for calculating the pneumatic area of the afterburner chamber with the flow guide support plate aiming at the characteristics of the afterburner chamber with the flow guide support plate, and solves the problems that the pneumatic area of the afterburner chamber with the flow guide support plate is complex and inaccurate in calculation.
The application provides a method for determining the pneumatic area of an afterburner chamber culvert with a flow guide support plate in a first aspect, which comprises the following steps:
s1, calculating the flow of the culvert gas in the afterburner and the culvert gas flow in a plurality of gas path zones mixed with the culvert gas, and determining the culvert gas flow ratio of each zone;
step S2, determining the geometric area ratio of each partition characteristic section;
step S3, determining a pneumatic area correction coefficient of the culvert according to the airflow ratio and the geometric area ratio of the culvert;
and step S4, calculating the pneumatic area of the culvert according to the pneumatic area correction coefficient of the culvert.
Preferably, before step S1, the method further includes:
and step S0, partitioning the afterburner chamber containing air with the flow guide support plate, and determining that the afterburner chamber containing air with the flow guide support plate comprises a first part entering a cooling channel of the heat shield, a second part entering a channel in front of the flow merging ring and the heat shield and a third part entering the flow guide support plate.
Preferably, in step S1, the determining the ratio of the amount of bypass airflow for each of the divided areas includes:
Figure BDA0003079251070000021
wherein alpha isiThe external bypass air flow ratio of the ith sub-zone, WiThe flow rate of the bypass air of the ith partition is n, and the number of the partitions is n.
Preferably, in step S2, the determining the ratio of the characteristic cross-sectional geometric areas of the respective partitions includes:
Figure BDA0003079251070000022
wherein beta isiIs the geometric area ratio of the ith partition, AgiIs the actual flow path geometric area of the ith partition, and n is the number of partitions.
Preferably, in step S3, the determining the bypass aerodynamic area correction factor includes:
Figure BDA0003079251070000031
wherein, γiFor the pneumatic area correction factor, alpha, of the culvert of the ith divisioniThe flow rate of the bypass air in the i-th sub-zone is betaiIs the geometric area ratio of the ith partition.
Preferably, in step S4, the calculating the pneumatic area of the bypass includes:
Ae＝γ1*Ag1+γ2*Ag2+……+γn*Agn
wherein, gamma isiPneumatic area correction factor of culvert for ith partition, AgiIs the actual flow path geometric area of the ith partition, and n is the number of partitions.
The application second aspect provides a take afterburner chamber of water conservancy diversion extension board contains pneumatic area and confirms device includes:
the outer culvert gas flow ratio calculation module is used for calculating the outer culvert gas flow in the flow of outer culvert gas in the afterburner and a plurality of gas path zones mixed with the inner culvert gas and determining the outer culvert gas flow ratio of each zone;
the geometric area ratio calculation module is used for determining the geometric area ratio of the characteristic section of each partition;
the correction coefficient determining module is used for determining a pneumatic area correction coefficient of the culvert according to the airflow ratio and the geometric area ratio of the culvert;
and the pneumatic area calculation module is used for calculating the pneumatic area of the culvert according to the pneumatic area correction coefficient of the culvert.
Preferably, the system further comprises a partition parameter obtaining module for obtaining parameters of each partition, wherein the partition comprises three parts, namely a first part entering the cooling channel of the heat shield, a second part entering the channel in front of the converging ring and the heat shield, and a third part entering the flow guide supporting plate.
The application solves the problem that the original method is not suitable for the afterburner with the flow guide support plate. The application provides a method suitable for calculating the pneumatic area of the afterburner chamber with the flow guide support plate aiming at the characteristics of the afterburner chamber with the flow guide support plate, and solves the problems that the pneumatic area of the afterburner chamber with the flow guide support plate is complex to calculate and inaccurate to calculate. The method and the device can provide accurate calculation results when the real-time simulation is carried out on the analysis and calculation processes of the gas circuit of the engine.
Drawings
FIG. 1 is a flow chart of a preferred embodiment of the method for determining the pneumatic bypass area of the afterburner chamber with the flow guide plate.
FIG. 2 is a schematic illustration of a culvert section of the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
The application provides a method for determining the pneumatic area of an afterburner culvert with a flow guide support plate in a first aspect, as shown in fig. 1, the method mainly comprises the following steps:
step S1, carrying out external culvert gas flow calculation on the flow of external culvert gas in the afterburner and a plurality of gas path zones mixed with the internal culvert gas, and determining the external culvert gas flow ratio of each zone;
step S2, determining the geometric area ratio of each partition characteristic section;
step S3, determining a pneumatic area correction coefficient of the culvert according to the airflow ratio and the geometric area ratio of the culvert;
and step S4, calculating the pneumatic area of the culvert according to the pneumatic area correction coefficient of the culvert.
In some optional embodiments, before step S1, the method further includes:
and step S0, partitioning the afterburner chamber containing air with the flow guide support plate, and determining that the afterburner chamber containing air with the flow guide support plate comprises a first part entering a cooling channel of the heat shield, a second part entering a channel in front of the flow merging ring and the heat shield and a third part entering the flow guide support plate.
The application firstly analyzes the air flow path of the outer culvert, combs the flowing of the outer culvert air in an afterburner and the mixing condition of the outer culvert air and the inner culvert air, and completes the division of the outer culvert air, the schematic diagram of the division of the outer culvert air with a support plate is shown in figure 2, the left side of figure 2 is the rear end structure of the afterburner of an engine, which comprises an afterburner cone positioned at the axis of the engine, a plurality of radially extending flame stabilizers connected with the afterburner cone and an afterburner flow guide support plate deflected and extended from the flame stabilizers, the full shielding of the afterburner is realized by the afterburner flow guide support plate, the right side of figure 2 is a binary spray pipe structure at the outlet of the engine, as can be seen from figure 2, the outer culvert is mainly divided into three flow paths, X1-X6 is the outer culvert air entering a cooling channel of a heat shield, Y1 is the outer culvert air of a channel before a confluence ring and the heat shield, Z is the outer culvert air entering the support plate, wherein Z1 is outer culvert gas entering water conservancy diversion extension board to flow out from the extension board lateral wall, be used for cooling the extension board, Z2 is for getting into the flame holder, and flow out from the stabilizer tailboard, be used for cooling off the stabilizer, Z3 is for getting into the afterburning cone, is used for cooling off the air current of inner cone.
In some alternative embodiments, the step S1 of calculating the amount of bypass airflow for each partition using a three-dimensional numerical simulation tool, and the determining the percentage of bypass airflow for each partition includes:
Figure BDA0003079251070000051
wherein alpha isiThe flow rate of the bypass air of the ith division, WiThe flow rate of the bypass air of the ith partition is n, and the number of the partitions is n.
In some alternative embodiments, the step S2, the determining the geometric area ratio of the characteristic cross section of each partition includes:
Figure BDA0003079251070000052
wherein beta isiIs the geometric area ratio of the ith partition, AgiIs the actual flow path geometric area of the ith partition, and n is the number of partitions.
In step S2, the characteristic cross section mainly refers to a channel cross section through which the culvert air flows to each partition when the culvert air is partitioned, that is, a cross section of an inlet portion of the airflow of each partition.
In some alternative embodiments, in step S3, determining the bypass aerodynamic area correction factor includes:
Figure BDA0003079251070000061
wherein, γiFor the pneumatic area correction factor, alpha, of the culvert of the ith partitioniThe flow rate of the bypass air in the i-th sub-zone is betaiIs the geometric area ratio of the ith partition.
In some alternative embodiments, the calculating the bypass aerodynamic area in step S4 includes:
Ae＝γ1*Ag1+γ2*Ag2+……+γn*Agn
wherein, γiPneumatic area correction factor of culvert for ith partition, AgiThe actual flow path geometric area of the ith partition is shown, and n is the number of the divided partitions.
The second aspect of the application provides a device for determining the aerodynamic area of an afterburner external culvert with a flow guide support plate, which corresponds to the method, and mainly comprises the following steps:
the outer culvert gas flow ratio calculation module is used for calculating outer culvert gas flow in the afterburner and a plurality of gas path zones mixed with inner culvert gas and determining the outer culvert gas flow ratio of each zone;
the geometric area ratio calculation module is used for determining the geometric area ratio of the characteristic section of each partition;
the correction coefficient determining module is used for determining a pneumatic area correction coefficient of the culvert according to the airflow ratio and the geometric area ratio of the culvert;
and the pneumatic area calculation module is used for calculating the pneumatic area of the culvert according to the pneumatic area correction coefficient of the culvert.
In some optional embodiments, the system further comprises a partition parameter obtaining module, configured to obtain parameters of each partition, where the partition includes three portions, namely a first portion entering the cooling channel of the heat shield, a second portion entering the channel in front of the converging ring and the heat shield, and a third portion entering the flow guide plate.
The method solves the problem that the original method is not suitable for the afterburner with the flow guide support plate. The application provides a method suitable for calculating the pneumatic area of the afterburner chamber with the flow guide support plate aiming at the characteristics of the afterburner chamber with the flow guide support plate, and solves the problems that the pneumatic area of the afterburner chamber with the flow guide support plate is complex to calculate and inaccurate to calculate.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (4)

1. A method for determining the pneumatic area of an afterburner culvert with a flow guide support plate is characterized by comprising the following steps of:
step S1, carrying out external culvert gas flow calculation on the flow of external culvert gas in the afterburner and a plurality of gas path zones mixed with the internal culvert gas, and determining the external culvert gas flow ratio of each zone;
step S2, determining the geometric area ratio of each partition characteristic section;
step S3, determining a pneumatic area correction coefficient of the culvert according to the airflow ratio and the geometric area ratio of the culvert;
step S4, calculating the pneumatic area of the culvert according to the pneumatic area correction coefficient of the culvert;
wherein, in step S1, determining the ratio of the amount of bypass airflow of each partition includes:
Figure FDA0003580761400000011
wherein alpha isiThe flow rate of the bypass air of the ith division, WiThe flow rate of the bypass air of the ith partition is n, and the number of the partitioned partitions is n;
in step S2, determining the ratio of the geometric area of the characteristic cross section of each partition includes:
Figure FDA0003580761400000012
wherein, betaiIs the geometric area ratio of the ith partition, AgiThe actual flow path geometric area of the ith partition is, and n is the number of the divided partitions;
in step S3, determining the pneumatic area correction coefficient of the culvert includes:
Figure FDA0003580761400000013
wherein, γiFor the pneumatic area correction factor, alpha, of the culvert of the ith divisioniThe flow rate of the bypass air in the i-th sub-zone is betaiFor the ith divisionGeometric area ratio;
in step S4, calculating the pneumatic area of the culvert includes:
Ae＝γ1*Ag1+γ2*Ag2+……+γn*Agn
wherein, gamma isiPneumatic area correction factor of culvert for ith partition, AgiIs the actual flow path geometric area of the ith partition, and n is the number of partitions.
2. The method for determining the afterburner chamber bypass aerodynamic area with a flow guide plate as claimed in claim 1, wherein before the step S1, the method further comprises:
and step S0, partitioning the afterburner chamber containing air with the flow guide support plate, and determining that the afterburner chamber containing air with the flow guide support plate comprises a first part entering a cooling channel of the heat shield, a second part entering a channel in front of the flow merging ring and the heat shield and a third part entering the flow guide support plate.
3. The utility model provides a take afterburning chamber of water conservancy diversion extension board to contain aerodynamic area determining means which characterized in that includes:
the outer culvert gas flow ratio calculation module is used for calculating the outer culvert gas flow in the flow of outer culvert gas in the afterburner and a plurality of gas path zones mixed with the inner culvert gas and determining the outer culvert gas flow ratio of each zone;
the geometric area ratio calculation module is used for determining the geometric area ratio of the characteristic section of each partition;
the correction coefficient determining module is used for determining a pneumatic area correction coefficient of the culvert according to the airflow ratio and the geometric area ratio of the culvert;
the pneumatic area calculation module is used for calculating the pneumatic area of the culvert according to the pneumatic area correction coefficient of the culvert;
wherein, in the external culvert airflow ratio calculation module, determining the external culvert airflow ratio of each partition includes:
Figure FDA0003580761400000021
wherein alpha isiThe flow rate of the bypass air of the ith division, WiThe external bypass airflow of the ith partition is the flow rate of the ith partition, and n is the number of the divided partitions;
in the geometric area ratio calculation module, determining the geometric area ratio of the characteristic cross section of each partition includes:
Figure FDA0003580761400000022
wherein, betaiIs the geometric area ratio of the ith partition, AgiThe actual flow path geometric area of the ith partition is, and n is the number of the divided partitions;
in the correction factor determination module, determining the pneumatic area correction factor of the bypass comprises:
Figure FDA0003580761400000031
wherein, γiFor the pneumatic area correction factor, alpha, of the culvert of the ith partitioniThe flow rate of the bypass air in the i-th sub-zone is betaiThe geometric area ratio of the ith partition is obtained;
in the aerodynamic area calculation module, calculating the pneumatic area of the culvert comprises:
Ae＝γ1*Ag1+γ2*Ag2+……+γn*Agn
wherein, γiPneumatic area correction factor of culvert for ith partition, AgiIs the actual flow path geometric area of the ith partition, and n is the number of partitions.
4. The afterburner chamber culvert aerodynamic area determination device with a flow directing plate of claim 3, further comprising a zoning parameter acquisition module for acquiring parameters of each zone, wherein the zones comprise three portions, a first portion entering a cooling channel of the heat shield, a second portion entering a channel in front of the converging ring and the heat shield, and a third portion entering the flow directing plate.
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