CN111648862A - Flexible bulge central body structure of variable particle separator and design method thereof - Google Patents
Flexible bulge central body structure of variable particle separator and design method thereof Download PDFInfo
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- CN111648862A CN111648862A CN202010365775.4A CN202010365775A CN111648862A CN 111648862 A CN111648862 A CN 111648862A CN 202010365775 A CN202010365775 A CN 202010365775A CN 111648862 A CN111648862 A CN 111648862A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/05—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/057—Control or regulation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a flexible bulge central body structure of a variable particle separator and a design method thereof, wherein the central body comprises a flexible bulge and a metal framework, and the flexible bulge is formed by compounding a rubber material and a fiber cord; the metal framework is integrally cylindrical, the flexible layer is embedded on the metal framework, and the copper-plated steel wire ring is arranged in the flexible layer and wound at grooves on two sides of the metal framework; and an inflation hole is formed in the inner wall surface of the metal framework to change the profile of the flexible bulge, so that the pneumatic requirement is met. The invention breaks the single use limitation of the particle separator, enables the molded surface of the particle separator to be repeatedly changed in a certain range, adjusts the area of the air inlet passage and the sand discharge efficiency, has the sand discharge function in the environment with high sand content, changes the molded surface in the environment with good environment, meets the requirement of pneumatic performance, and has good engineering and innovation.
Description
Technical Field
The invention relates to a flexible bulge central body structure of a variable particle separator and a design method thereof, belonging to the technical field of aero-engine structural design.
Background
A helicopter is a common aircraft, mainly benefiting from the flexible flight characteristics that distinguish other aircraft: the device can take off and land in some wide and non-specific places and can stably hover in the air; the method is not limited by landform; the flight path, the flight height, the speed and the attitude can be changed rapidly according to the change of the working condition. Helicopters are often operated in harsh working environments, such as desert regions, offshore areas, forest fires, snow-covered glaciers, and the like. The particulate impurities in these environments, such as sand, salt fog, leaves, ice and snow, are inevitably sucked into the engine, and have a significant influence on the life of the engine. Therefore, it is necessary to add a particle separator to the engine air inlet component to separate and purify the air flow entering the engine.
And the variable particle separator provides the inner wall flexible surface bulge as an inflatable bladder bulge. Therefore, the using requirements of the engine under different flight environments are met. Under the flying environment with high sand concentration, the air pressure is added to the bulge air bag, so that the inner wall surface bulges, the sand separation efficiency is increased, and the air inlet pneumatic performance is properly sacrificed; under a good flying environment, the air bag is inflated to reduce the air pressure, so that the inner wall surface of the air bag is inflated to restore the original optimal profile, the total pressure loss and the distortion of the inlet airflow are reduced, and the particle separator keeps higher pneumatic performance.
The central body of the variable particle separator is a core component, not only has the sand discharge function of the traditional particle separator, but also realizes the self-adaptive function, so that the shape and height of the bulge molded surface are changed within a certain range to adjust the pneumatic load requirement of the air inlet, and the properties of the bulge molded surface and the air inlet are both achieved, therefore, under the condition, the original limitations on materials and structures need to be broken through, and a new idea is provided for the variable particle separator.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a flexible bulge central body structure of a variable particle separator and a design method thereof.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a flexible bulge central body structure of a variable particle separator comprises a flexible bulge and a metal framework;
the flexible bulge is formed by compounding a rubber material and a fiber cord, the bulge profile meets the aerodynamic requirement, the shape is changed in the range between the basic profile and the highest profile, namely when no air pressure exists inside, the profile is the basic profile, the pneumatic requirement of an air inlet channel can be met, and when the inside is pressurized, the profile is raised, the sand discharging efficiency can be improved, and an engine is protected;
the metal framework is integrally cylindrical, and the outer side wall surface of the metal framework comprises a middle arc surface and grooves on two sides; the flexible bulge is sleeved outside the metal framework, and two ends of the flexible bulge are respectively wound by copper-plated steel wires and embedded into the grooves, so that the inner cavity of the bulge is better in sealing performance and is not easily broken by overlarge internal pressure; the inner wall surface of the metal framework is provided with an inflation hole, and the interior of the bulge is inflated and deflated through an external air pipe so as to change the molded surface of the flexible bulge and meet the pneumatic requirement.
In the invention, the whole body of the central body of the variable particle separator consists of two parts, namely a flexible bulge and a metal framework, wherein the flexible bulge is formed by compounding a rubber material and a fiber cord, and has certain elasticity and certain rigidity. The metal framework plays a role in bearing and connecting, on one hand, the flexible bulges are embedded on the metal framework to play a role in bearing, and on the other hand, the metal framework is arranged in the air inlet channel to connect the front part and the rear part.
When the helicopter is in a flying environment with high sand content, the inner cavity of the bulge is pressurized through the air hole in the metal framework, so that the inner cavity of the sealed flexible bulge expands, the height gradually rises, the flow area of the air inlet channel is properly reduced, the highest molded surface is finally reached, the sand discharging efficiency is improved, and the engine is protected.
When the helicopter flies in a good environment, the air pressure in the sealed inner cavity of the flexible bulge is gradually discharged, the volume of the bulge is reduced, the flow area of the air inlet channel is gradually increased, and the profile of the bulge is restored to the basic profile, so that better aerodynamic performance is obtained, and the requirement of an engine is met.
Further, flexible swell is concrete including outer glue film, interior glue film and lay the fibre cord fabric between outer glue film and interior glue film, and fibre cord fabric is the multilayer and folds to lay. The outer glue layer profile of the bulge is the basic profile, and the inner glue layer is the pressure bearing surface of the inner cavity of the bulge and has a sealing effect under the pressure of internal gas.
Further, the flexible bump is of an eccentric design, namely, the profile is asymmetric, and the flexible bump is in accordance with aerodynamics. The pneumatic performance is satisfied when the basic profile, after inflating through aerifing the hole inside and pressurizing, reaches the highest profile gradually, satisfies the sand discharge demand under the specific environment.
Further, the height of the basic profile is increased by 10% to the highest profile, air can be repeatedly inflated and deflated, and the height error is controlled within 5%.
The design method of the flexible bulge central body structure of the variable particle separator comprises the following steps:
1) determining variable particle separator centerbody bulge profile
According to the bulge design requirement of the central body of the variable particle separator, the change requirement of the throat area of an air inlet and the sand discharge efficiency, the bulge molded surface of the central body of the variable particle separator is pneumatically designed to obtain two main molded surfaces which are respectively a basic molded surface and a highest molded surface;
2) determining structural form and material of variable particle separator centerbody
The central body of the variable particle separator comprises a flexible bulge and a metal framework, wherein the flexible bulge is formed by compounding an elastic rubber film and a fiber cord, and the inner wall surface of the metal framework serving as a bearing piece and a connecting piece is provided with an inflation hole for applying internal air pressure load to the flexible bulge so as to realize the deformation of the flexible bulge;
3) determining matching relation between pneumatic demand and sand discharge efficiency
According to the design requirement of the variable particle separator, the flow requirement and the sand discharge rate of the engine in different environments and flight states are determined according to the sand-dust separation efficiency and the matching relation of the pneumatic load requirement and the flow of the engine, and then the corresponding relation of the height of the molded surface of the flexible bulge and the pneumatic requirement and the sand separation rate is determined.
Has the advantages that: the flexible bulge central body structure of the variable particle separator and the design method thereof provided by the invention have the advantages that the single use limitation of the particle separator is broken, the molded surface of the particle separator can be repeatedly changed within a certain range, the area of the air inlet channel and the sand discharging efficiency are adjusted, the sand discharging function is realized in the environment with high sand content, the molded surface is changed in the good environment, the requirement on pneumatic performance is met, and the engineering and the innovation are good.
Drawings
FIG. 1 is a schematic diagram of a variable particle separator model;
FIG. 2 is a schematic diagram of the construction of a flexible bulge center for a variable particle separator according to the present invention;
FIG. 3 is a schematic cross-sectional view of a metal skeleton according to the present invention;
FIG. 4 is a schematic view of the internal structure of a flexible bulge center for a variable particle separator according to the present invention;
the figure includes: 1. the structure comprises a central body, 2 parts of an outer wall surface, 3 parts of a flow divider, 4 parts of a highest profile, 5 parts of a basic profile, 6 parts of a flexible bulge, 7 parts of a metal framework, 8 parts of an inflation hole, 9 parts of fiber cord fabric, 10 parts of an outer adhesive layer, 11 parts of an inner adhesive layer, 12 parts of a groove, 13 parts of a copper-plated steel wire.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
And according to the design requirement of the central body of the variable particle separator and the sand discharge efficiency of the particle separator, performing pneumatic analysis on the bulge molded surface to obtain a calculated three-dimensional model. As shown in fig. 1, the variable particle separator is mainly composed of important components such as an outer wall surface 2, a flow divider 3, a central body 1 and the like, and the central body 1 is a core component and plays a key role in changing the throat area of an air inlet and discharging sand. Whereas the flexible bulge 6 on the central body 1 can gradually reach the highest profile 4 after being pressurized by the base profile 5.
FIG. 2 shows a flexible bulge center body structure of a variable particle separator, which comprises a flexible bulge 6 and a metal skeleton 7; wherein the flexible bulge 6 is compounded from rubber material and fibre cords, the bulge profile of which meets aerodynamic requirements and changes shape in the range between the base profile 5 and the highest profile 4.
As shown in fig. 3, the metal framework 7 is cylindrical as a whole, and the outer side wall surface thereof includes a middle arc surface and grooves 12 on two sides; the flexible bulge 6 is sleeved outside the metal framework 7, and two ends of the flexible bulge are respectively wound by copper-plated steel wires 13 and embedded into the grooves 12 to realize sealing and fixing; and an inflation hole 8 is formed in the inner wall surface of the metal framework 7 and used for applying internal air pressure load to the flexible bump to realize the deformation of the flexible bump.
The central body is most central in the overall structure of the particle separator, and the central body of the traditional particle separator is required to be replaced by the central body of the traditional particle separator, so that the central body of the traditional particle separator is simple and practical in structure, cannot have too many parts and components, is too complicated to be unfavorable for potential safety hazard investigation and use efficiency, and can reach good sand discharge efficiency, and the throat area of an air inlet channel can be adjusted to change pneumatic load. Under the requirement of the design idea, the flexible drum bag is composed of a flexible drum bag and a metal framework, and is simple in structure and good in practical effect. Wherein the flexible bulge is formed by compounding rubber and fiber cord fabric. The metal framework is provided with small holes, and the profile is changed by internally pressurizing through the air holes. The grooves are formed in the two sides of the metal framework, the flexible material can be fastened on the metal framework after being wound by the copper-plated steel wires, the sealing performance is good, and the flexible material is firm and not prone to being separated.
As shown in fig. 4, the flexible bump 6 specifically includes an outer adhesive layer 10, an inner adhesive layer 11, and a fiber cord fabric 9 laid between the outer adhesive layer 10 and the inner adhesive layer 11, and the fiber cord fabric 9 is laid in a multi-layer overlapping manner.
Further, the center body bulge of the variable particle separator is of an eccentric design, i.e., asymmetric in profile, and is aerodynamically favorable. The pneumatic performance is satisfied when the basic profile, after inflating through aerifing the hole inside and pressurizing, reaches the highest profile gradually, satisfies the sand discharge demand under the special environment.
Further, the height of the basic profile 5 to the highest profile 4 is increased by 10%, air can be repeatedly inflated and deflated, and the height error is controlled within 5%.
The design method of the flexible bulge central body structure of the variable particle separator comprises the following steps:
1) determining variable particle separator centerbody bulge profile
According to the bulge design requirement of the central body of the variable particle separator, the change requirement of the throat area of the air inlet and the sand discharge efficiency, the bulge molded surface is pneumatically designed to obtain two main molded surfaces, namely a basic molded surface and a highest molded surface. Under the flying environment with high sand concentration, the bulge reaches the highest profile, the sand separating efficiency can be increased, and the air inlet pneumatic performance is properly sacrificed. Under a good flying environment, the bulge restores the original basic molded surface, reduces the total pressure loss and distortion of the intake airflow, and ensures that the particle separator keeps higher pneumatic performance.
2) Determining structural form and material of variable particle separator centerbody
The most central structure of the variable particle separator is a central body which is composed of a flexible bulge and a metal framework, wherein the flexible bulge is compounded by rubber materials and fiber cords. Having both the elastic characteristics of rubber and the stiffness of the fiber cord.
The metal skeleton is used as a part of the central body, as shown in fig. 3, plays a role of a carrier of the flexible bulge, and is also a connecting piece in the structure of the particle separator, and the metal skeleton is provided with an air inflation hole for applying internal air pressure load to the flexible layer to realize the deformation of the flexible bulge.
3) Determining matching relation between pneumatic demand and sand discharge efficiency
According to the design requirement of the variable particle separator, the flow requirement and the sand discharge rate of the engine in different flight states in different environments are determined according to the sand-dust separation efficiency and the flow matching relation of the pneumatic load requirement and the engine, and then the corresponding relation of the height of the flexible bump molded surface and the pneumatic requirement and the sand separation rate is determined.
4) Bump profile displacement determination
When the helicopter is in a flying environment with high sand content, the inner cavity of the bulge is pressurized through the inflation hole on the metal framework, so that the inner cavity of the sealed flexible bulge expands, the height gradually rises, the flow area of the air inlet channel is properly reduced, the highest molded surface is finally reached, the sand discharging efficiency is improved, and the engine is protected.
When the helicopter flies in a good environment, the air pressure in the sealed inner cavity of the flexible bulge is gradually discharged, the volume of the bulge is reduced, the flow area of the air inlet channel is gradually increased, and the profile of the bulge is restored to the basic profile, so that better aerodynamic performance is obtained, and the requirement of an engine is met.
5) Preparation of the Central body
As shown in fig. 4, the central body is mainly composed of a flexible bulge and a metal framework, wherein the flexible bulge is formed by compounding cord thread and rubber, an inner cavity formed by an inner rubber layer and the metal framework can protect fiber cord fabric in the middle of the flexible layer, and the profile of the bulge is changed after the inner cavity is pressurized so as to achieve the effect of separating sand grains.
The outer rubber layer is in contact with air, and has good aging resistance and scratch resistance, so that the outer rubber layer has a good service life in an environment with high sand concentration. The rubber which is suitable for external environmental factors (environments such as humidity and heat resistance and mildew resistance) can be selected according to specific use environments so as to be suitable for marine or humid air environments.
The inner part of the rubber is compounded by nylon cords, and the fiber cords are mutually overlapped according to different angles, thereby playing the role of improving the rigidity.
When being attached to metal framework with flexible layer material, place flexible layer inside and twine in metal framework both sides groove with the copper-plated steel wire in, fasten the flexible layer on the skeleton, make flexible swell have better leakproofness and fastness. The reason why the copper-plated steel wire is used is that copper ions react with the rubber in contact with the copper ions, so that the copper-plated steel wire is more bonded to the rubber and is less likely to be peeled off.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (5)
1. A flexible bulge central body structure of a variable particle separator is characterized by comprising a flexible bulge and a metal framework;
wherein the flexible bump is compounded by rubber materials and fiber cords, the bump profile meets the aerodynamic requirement, and the shape is changed in the range between the basic profile and the highest profile;
the metal framework is integrally cylindrical, and the outer side wall surface of the metal framework comprises a middle arc surface and grooves on two sides; the flexible bulge is sleeved outside the metal framework, and two ends of the flexible bulge are respectively wound by copper-plated steel wires and embedded into the grooves to realize sealing and fixing; and the inner wall surface of the metal framework is provided with an inflation hole for applying internal air pressure load to the flexible bulge to realize the deformation of the flexible bulge.
2. The flexible bulge central body structure of claim 1, wherein the flexible bulge comprises an outer glue layer, an inner glue layer and a fiber cord fabric laid between the outer glue layer and the inner glue layer, and the fiber cord fabric is laid in a plurality of layers in an overlapping manner.
3. The variable particle separator flexible bulge center body configuration of claim 1, wherein said flexible bulge is of an eccentric design, i.e., asymmetric in profile.
4. The variable particle separator flexible bulging center body structure of claim 1, wherein the base profile is 10% higher up to the highest profile with a height tolerance within 5%.
5. A method of designing a flexible bulge centerbody configuration for a variable particle separator according to any one of claims 1-4, comprising the steps of:
1) determining variable particle separator centerbody bulge profile
According to the bulge design requirement of the central body of the variable particle separator, the change requirement of the throat area of an air inlet and the sand discharge efficiency, the bulge molded surface of the central body of the variable particle separator is pneumatically designed to obtain two main molded surfaces which are respectively a basic molded surface and a highest molded surface;
2) determining structural form and material of variable particle separator centerbody
The central body of the variable particle separator comprises a flexible bulge and a metal framework, wherein the flexible bulge is formed by compounding an elastic rubber film and a fiber cord, and the inner wall surface of the metal framework serving as a bearing piece and a connecting piece is provided with an inflation hole for applying internal air pressure load to the flexible bulge so as to realize the deformation of the flexible bulge;
3) determining matching relation between pneumatic demand and sand discharge efficiency
According to the design requirement of the variable particle separator, the flow requirement and the sand discharge rate of the engine in different environments and flight states are determined according to the sand-dust separation efficiency and the matching relation of the pneumatic load requirement and the flow of the engine, and then the corresponding relation of the height of the molded surface of the flexible bulge and the pneumatic requirement and the sand separation rate is determined.
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| CN202010365775.4A CN111648862A (en) | 2020-04-30 | 2020-04-30 | Flexible bulge central body structure of variable particle separator and design method thereof |
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Application publication date: 20200911 |