CN117685098A - Stepless adjusting device for outer duct of variable-cycle engine - Google Patents
Stepless adjusting device for outer duct of variable-cycle engine Download PDFInfo
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- CN117685098A CN117685098A CN202410137738.6A CN202410137738A CN117685098A CN 117685098 A CN117685098 A CN 117685098A CN 202410137738 A CN202410137738 A CN 202410137738A CN 117685098 A CN117685098 A CN 117685098A
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Abstract
The application discloses become stepless adjusting device of circulation engine outer duct relates to aviation equipment technical field to solve current many ducts and become circulation engine and change the mutation and the jump of parameter in the duct conversion in-process thermodynamic cycle, be difficult to realize steady transition and can't guarantee the problem that transition stage has higher propulsion efficiency between the each level. The application comprises an outer duct contraction actuating mechanism, a duct contraction mechanism and a variable sealing ring mechanism; the structure main body of the duct contraction mechanism is of a flake-like annular sheet structure, the aircraft-mounted computer controls the actuating cylinder to perform reciprocating action, so that expansion and contraction movements are realized, the variable sealing ring mechanism is driven to synchronously expand and contract, stepless adjustment of the diameter of the outer duct is realized, and the whole process of the engine is ensured to have high propulsion efficiency; the transition between the maximum size and the minimum size of the outer duct is realized by combining the horn mouth type shrinkage and expansion structure of the duct shrinkage mechanism and the cylindrical structure of the variable sealing ring mechanism.
Description
Technical Field
The application relates to the technical field of aviation equipment, in particular to a stepless adjusting device for an outer duct of a variable-cycle engine.
Background
The variable cycle engine is characterized in that the shape, the size and the position of a part of the structure are adjusted, so that the flow distribution of the inner and outer ducts is changed, and continuous switching among different thermodynamic cycles is realized, so that the economical efficiency and the high thrust requirement in the whole flight envelope are considered.
Currently, a main structural form commonly used for a multi-duct variable cycle engine is a double-outer-duct structure taking a core engine driving fan (CDFS) and a vane Fan (FLADE) as core components, and a three-duct engine integrating the core engine driving fan (CDFS) and the vane Fan (FLADE). The main components that change the circulation parameters are the Mode Selection Valve (MSV), the front variable area bypass diverter (FVABL) and the rear variable area bypass diverter (RVABI). The Mode Selection Valve (MSV) is arranged at the front fan, the engine works in a single culvert mode when the Mode Selection Valve (MSV) is closed, and the engine works in a double culvert mode when the Mode Selection Valve (MSV) is opened. The front variable area bypass flow diverter (fvbl) coordinates the blending of the fan bypass airflow and the Core Driven Fan (CDFS) bypass airflow with a high total pressure differential by geometric adjustment and mitigates the possible backflow of the Core Driven Fan (CDFS) bypass high pressure airflow (relative to the fan bypass airflow). The three-culvert variable cycle engine is formed by adding FLADE on the basis of the double-culvert variable cycle engine with CDFS.
However, the thermodynamic cycle parameters are regulated in a stepped mode in both a double culvert and a triple culvert, the problems of mutation and jump exist in the switching process of different working phases, smooth transition is difficult to realize, the overall efficiency of the engine is adversely affected, and the higher propulsion efficiency in the transition phases between the stages cannot be ensured.
Regarding the above study, a learner analyzed the design parameter matching relationship of the variable bypass engine, wherein the influence of the fan bypass ratio and the total temperature of the main combustion chamber outlet on the total pressure ratio of the inner and outer bypass inlets and the total pressure of the outlet of the rear variable area bypass diverter (RVABI) of the core-driven fan-type variable cycle engine (CDFS VCE) is shown in fig. 1 and 2.
The effect of fan bypass ratio and main combustor exit total temperature on CDFS VCE unit thrust and fuel consumption is shown in fig. 3 and 4. Increasing fan bypass ratio B Fan Or reducing the total temperature T of the outlet of the main combustion chamber t,4 The engine unit thrust Fs is reduced and the fuel consumption sfc is reduced.
As can be seen from fig. 1, 2, 3 and 4, the trend of the duct geometry parameter and the engine performance parameter changes linearly.
Meanwhile, a learner researches a mode transition state conversion process from a single culvert mode to a double culvert mode in the CDFS variable cycle engine, and changes of a fan and a CDFS supercharging ratio pi in the mode conversion process and comparison of the changes and test data are shown in fig. 5 and 6. It can be seen from fig. 5 and 6 that the boost ratio is nonlinear when the variable cycle engine is switched from single outer duct to double outer duct, and the cycle parameters have abrupt and jump problems.
The meanings of the relevant variables in the above figures 1-6 are: p (P) t,56 Is the inclusion inlet pressure; p (P) t,16 Is the external culvert inlet pressure; t (T) t,4 The total temperature of the outlet of the main combustion chamber; b (B) Fan Is the fan bypass ratio; p (P) t,6 Is the outlet cross-sectional pressure; fs is engine unit thrust; sfc is fuel consumption; pi Fan A fan boost ratio; pi CDFS The fan stage boost ratio is driven for the core machine.
Disclosure of Invention
Therefore, the application provides an outer duct stepless regulating device of a variable cycle engine, which aims to solve the problems that the conventional multi-duct variable cycle engine is difficult to realize stable transition and cannot ensure higher propulsion efficiency in transition stages between stages due to mutation and jump of thermodynamic cycle parameters in the duct conversion process.
In order to achieve the above object, the present application provides the following technical solutions:
a variable cycle engine outer duct stepless adjustment device, comprising: the structure main body of the duct contraction mechanism is of a horn mouth type contraction and expansion structure and is distributed in a flake-like annular sheet structure, and the structure main body of the variable sealing ring mechanism is of a cylindrical structure;
the outer duct shrinkage actuating mechanism is arranged outside the outer duct fan casing, the variable sealing ring mechanism is arranged outside the inner duct casing, and the outer duct shrinkage actuating mechanism is connected with the variable sealing ring mechanism through the duct shrinkage mechanism; the airborne computer is used for controlling the operation of the outer duct contraction actuating mechanism;
the outer duct shrinkage actuating mechanism comprises an actuating cylinder fixing ring, an actuating cylinder and an actuating slide block, the duct shrinkage mechanism comprises a shrinkage inner piece, a shrinkage outer piece and a shrinkage inner piece actuating slide rail, the actuating cylinder fixing ring is arranged outside the outer duct fan casing, one end, close to the duct shrinkage mechanism, of the actuating cylinder fixing ring is connected with a plurality of shrinkage inner pieces in a scale-like annular sheet structure, and a plurality of actuating cylinders which are in one-to-one correspondence with the shrinkage inner pieces are fixed on the actuating cylinder fixing ring; the outer part of the shrinkage inner sheet is provided with a shrinkage outer sheet and a shrinkage inner sheet actuating slide rail, one end of the shrinkage outer sheet is connected with the actuating cylinder, and the other end of the shrinkage outer sheet is connected with the shrinkage inner sheet actuating slide rail through the actuating slide block;
the variable sealing ring mechanism comprises a sealing ring inner piece, a sealing ring outer piece stabilizing slide block and a sealing ring inner piece stabilizing slide rail, wherein a plurality of sealing ring inner pieces are arranged outside the inner channel casing, the plurality of sealing ring inner pieces are connected with the plurality of shrinkage inner pieces in a one-to-one correspondence manner, the sealing ring outer piece is arranged between the adjacent sealing ring inner pieces, the sealing ring outer piece stabilizing slide block is arranged on the side face of the sealing ring outer piece, and the sealing ring inner piece stabilizing slide rail matched with the sealing ring outer piece stabilizing slide block is arranged on the outer side surface of the sealing ring inner piece adjacent to the sealing ring outer piece;
the duct constriction mechanism further comprises a sealing assembly, and the sealing assembly is arranged at the joint of the adjacent constriction inner sheets.
Optionally, the sealing assembly comprises a shrink outer patch and a shrink outer patch slide rail, the shrink outer patch being connected with the ram fixing ring through the shrink outer patch slide rail; the shrinkage outer patch sliding rail is arranged between the adjacent shrinkage inner sheets;
and under the drive of the shrinkage outer sheet, the shrinkage outer patch slides along the shrinkage outer patch sliding rail and expands and contracts along with the shrinkage outer sheet.
Optionally, one end of the contraction inner piece far away from the variable sealing ring mechanism is connected with the actuator cylinder fixing ring through a first roller, and half of the first roller is fixedly connected with the actuator cylinder fixing ring, and the other half of the first roller is rotationally connected with the contraction inner piece;
one end of the shrinkage outer patch sliding rail far away from the variable sealing ring mechanism is connected with the actuator cylinder fixing ring through a second roller, one half of the second roller is fixedly connected with the actuator cylinder fixing ring, and the other half of the second roller is rotationally connected with the shrinkage outer patch sliding rail.
Optionally, one end of the contraction inner piece, which is close to the variable sealing ring mechanism, is connected with the sealing ring inner piece through a third roller, one half of the third roller is fixedly connected with the contraction inner piece, and the other half of the third roller is rotationally connected with the sealing ring inner piece;
one end of the shrinkage external patch, which is close to the variable sealing ring mechanism, is connected with the sealing ring external piece through a fourth roller, and half of the fourth roller is fixedly connected with the shrinkage external patch, and the other half of the fourth roller is rotationally connected with the sealing ring external piece.
Optionally, the sliding rail for actuating the inner contraction piece comprises a fixing piece and a first sliding hole which is arranged on the fixing piece in an inclined way, and the fixing piece is arranged on the outer wall of the inner contraction piece and is positioned at one end close to the fixed ring of the actuating cylinder;
the telescopic outer piece comprises a sleeve and a connecting piece connected with the sleeve, one end of the actuating cylinder is positioned in the sleeve, and the actuating cylinder drives the sleeve to move forwards and backwards under the action of an onboard computer; the connecting piece is provided with the action slider far away from the one end of sleeve, the action slider runs through first slide hole to follow first slide hole reciprocates and can rotate relatively.
Optionally, the connecting piece is a U-shaped structural piece, and two through holes symmetrically arranged are formed in two sides of the opening end of the connecting piece; the actuating slide block is of a cylindrical structure, and two ends of the actuating slide block respectively penetrate through the two through holes and are fixedly connected with the connecting piece.
Optionally, a second sliding hole is formed in the seal ring inner piece stabilizing sliding rail, a moving block is arranged at one end, close to the seal ring inner piece stabilizing sliding rail, of the seal ring outer piece stabilizing sliding block, and the moving block slides in the second sliding hole.
Optionally, the connection part of two adjacent shrink inner sheets is provided with the shrink outer patch sliding rail, the shrink outer patch sliding rail is arranged at the outer side of an annular structure surrounded by a plurality of shrink inner sheets, and the shrink outer patch sliding rail is connected with the two shrink inner sheets through a first plane sliding mechanism;
the connecting part of the adjacent sealing ring inner sheets is provided with the sealing ring outer sheets, the sealing ring outer sheets are arranged on the outer side of an annular structure surrounded by the sealing ring inner sheets, and the sealing ring outer sheets are connected with the two sealing ring inner sheets through a second planar sliding mechanism.
Compared with the prior art, the application has the following beneficial effects:
1. the application provides a variable cycle engine outer duct stepless regulation device based on further analysis and research to prior art problem, includes: an outer duct constriction actuating mechanism, a duct constriction mechanism, a variable seal ring mechanism and an onboard computer; the main structure of the duct contraction mechanism is of a flake-like annular sheet structure, an on-board computer controls an actuating cylinder of the outer duct contraction actuating mechanism to perform a reciprocating action process, so that expansion and contraction movements are realized, and the variable sealing ring mechanism is driven to synchronously expand and contract, thereby realizing stepless adjustment of the diameter of the outer duct, and ensuring that the whole process of the engine has high propulsion efficiency; the structure main body of the duct shrinkage mechanism is of a bell-mouth type shrinkage and expansion structure, the structure main body of the variable sealing ring mechanism is of a rear-section cylindrical structure, and the stable transition between the maximum size and the minimum size of the outer duct is realized in a mode of combining the bell-mouth type shrinkage and expansion structure and the rear-section cylindrical structure, so that the problems of abrupt change and jump are avoided, and the overall efficiency of the engine is improved; simultaneously, the bell mouth-shaped shrinkage and expansion structure and the rear section cylindrical structure synchronously perform stepless adjustment according to the height and speed change; the stepless regulating device for the outer duct of the variable cycle engine avoids abrupt change and jump of cycle parameters, ensures the stable operation of the engine, and can perform linear or nonlinear regulation according to different state parameters of the engine operation under the action of an onboard computer, thereby ensuring that the variable duct engine always keeps high propulsion efficiency;
2. in the shrinkage mechanism, the shrinkage inner sheet and the shrinkage outer sheet do not generate gaps in the stepless regulation process, so that the minimum air flow loss is effectively ensured;
3. the variable sealing ring mechanism can finish stepless air flow adjustment along with the duct contraction mechanism, and the air flow stability of the duct contraction mechanism in the contraction and expansion process is improved.
4. The slide rail distribution is set up at the outside surface of sealing ring structure (sealing ring piece and sealing ring outer piece) to sealing ring outer piece stable slider and sealing ring inner piece stable slide rail in this application, and the expansion of sealing ring inner piece and sealing ring outer piece is played the stabilization effect to the mutual slip of expansion, shrink motion in-process.
Drawings
For a more visual description of the prior art and the present application, exemplary drawings are presented below. It should be understood that the specific shape and configuration shown in the drawings should not be considered in general as limiting upon the practice of the present application; for example, based on the technical concepts and exemplary drawings disclosed herein, those skilled in the art have the ability to easily make conventional adjustments or further optimizations for the add/subtract/assign division, specific shapes, positional relationships, connection modes, dimensional scaling relationships, etc. of certain units (components).
FIG. 1 is a diagram of a prior art B of the present application Fan And T t,4 For CDFS VCE P t,56 /P t,16 Schematic of the effect of (a);
FIG. 2 is a diagram of a prior art B of the present application Fan And T t,4 For CDFS VCE P t,6 Schematic of the effect of (a);
FIG. 3 is a diagram of prior art B of the present application Fan And T t,4 For CDFS VCE F s Schematic of the effect of (a);
FIG. 4 is a diagram of prior art B of the present application Fan And T t,4 Schematic of the effect on CDFS VCE sfc;
FIG. 5 illustrates a single external shout to dual external bypass mode transition pi in the prior art of the present application Fan A comparative schematic;
FIG. 6 shows a single culvert to dual culvert mode transition pi in the prior art of the present application CDFS A comparative schematic;
fig. 7 is a schematic structural diagram of a stepless adjusting device for an outer duct of a variable cycle engine in a fully contracted state according to an embodiment of the present application;
fig. 8 is a schematic structural diagram II of the variable cycle engine outer duct stepless adjusting device in a fully contracted state according to an embodiment of the present application;
FIG. 9 is a side view of the device shown in FIG. 7;
FIG. 10 is a partial schematic view I of the outer stent constriction actuation mechanism, stent constriction mechanism, variable seal ring mechanism shown in FIG. 7;
FIG. 11 is a second schematic illustration in partial view of the outer stent constriction actuation mechanism, stent constriction mechanism, variable seal ring mechanism shown in FIG. 7;
FIG. 12 is a cross-sectional view of the device shown in FIG. 7;
FIG. 13 is a partial schematic view I of the outer stent constriction actuation mechanism, stent constriction mechanism, variable seal ring mechanism shown in FIG. 12;
FIG. 14 is a second schematic illustration in partial view of the outer stent constriction actuation mechanism, stent constriction mechanism, variable seal ring mechanism shown in FIG. 12;
FIG. 15 is a schematic view in partial section of the seal ring outer plate stabilizing slide of FIG. 10 at the seal ring inner plate stabilizing slide track;
FIG. 16 is a second schematic illustration of a portion of the seal ring outer plate stabilizing slide shown in FIG. 10 at the seal ring inner plate stabilizing slide track;
FIG. 17 is a schematic diagram of a stepless adjusting device for an outer duct of a variable cycle engine in an incompletely contracted state according to an embodiment of the present application;
FIG. 18 is a second schematic structural view of the variable cycle engine outer duct stepless adjustment device according to one embodiment of the present disclosure in an incompletely contracted state;
FIG. 19 is a schematic view of a variable cycle engine outer duct stepless adjustment device in a fully expanded state according to one embodiment of the present disclosure;
FIG. 20 is a second schematic structural view of the variable cycle engine outer duct stepless adjustment device according to one embodiment of the present disclosure in a fully expanded state;
FIG. 21 is a schematic structural view of a variable cycle engine outer duct stepless adjustment device (with a combustion chamber, a tail nozzle and a turbine) in a fully expanded state according to one embodiment of the present application;
FIG. 22 is a schematic diagram II (with a combustion chamber, a tail nozzle and a turbine) of a variable cycle engine outer duct stepless adjustment device provided in an embodiment of the present application in a fully expanded state;
FIG. 23 is a schematic structural view of a variable cycle engine outer duct stepless adjustment device (with a combustion chamber, a tail nozzle and a turbine) in an incompletely contracted state according to an embodiment of the present application;
FIG. 24 is a schematic diagram II (with a combustion chamber, a tail nozzle and a turbine) of a variable cycle engine outer duct stepless adjustment device provided in an embodiment of the present application in an incompletely contracted state;
FIG. 25 is a schematic structural view of a variable cycle engine outer duct stepless adjustment device (with a combustion chamber, a tail nozzle and a turbine) in a fully contracted state according to one embodiment of the present application;
FIG. 26 is a second schematic structural view (with a combustion chamber, a tail nozzle, and a turbine) of the variable cycle engine outer duct stepless adjustment device provided in one embodiment of the present application in a fully contracted state;
FIG. 27 is a schematic view of a first planar sliding mechanism provided in one embodiment of the present application;
fig. 28 is a schematic view of a second planar sliding mechanism according to an embodiment of the present application.
Reference numerals illustrate:
1. an outer duct constriction actuation mechanism; 11. a ram retaining ring; 12. an actuator cylinder; 13. actuating the slider;
2. a duct constriction mechanism; 21. shrinking the inner sheet; 22. shrinking the outer sheet; 221. a sleeve; 222. a connecting piece; 23. the inner sheet is contracted to actuate the sliding rail; 231. a fixing member; 232. a first slide hole; 24. contracting the outer patch; 25. contracting the outer patch slide rail; 26. a first roller; 27. a second roller; 28. a third roller; 29. a fourth roller;
3. a variable seal ring mechanism; 31. a seal ring inner sheet; 32. an outer piece of the sealing ring; 33. the outer piece of the sealing ring stabilizes the sliding block; 331. a moving block; 34. a sealing ring inner piece stabilizes the sliding rail; 341. a second slide hole;
4. an outer ducted fan casing;
5. an inner culvert casing;
6. a combustion chamber; 7. a tail nozzle; 8. a turbine; 9. an outer duct; 10. an inner duct; 14. a first chute; 15. a first protrusion; 16. a second chute; 17. and a second protrusion.
Detailed Description
The present application is further described in detail below with reference to the attached drawings.
In the description of the present application: unless otherwise indicated, the meaning of "a plurality" is two or more. The terms "first," "second," "third," and the like in this application are intended to distinguish between the referenced objects without a special meaning in terms of technical connotation (e.g., should not be construed as emphasis on degree or order of importance, etc.). The expressions "comprising", "including", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).
The terms such as "upper", "lower", "left", "right", "middle", and the like, as used in this application, are generally used for the purpose of facilitating an intuitive understanding with reference to the drawings and are not intended to be an absolute limitation of the positional relationship in actual products.
In one embodiment of the application, the variable cycle engine outer duct stepless regulating device is arranged on an engine, and the engine comprises a combustion chamber 6, a tail nozzle 7, a turbine 8, an outer duct 9 and an inner duct 10; as shown in fig. 7 to 26, the present stepless adjustment device includes: the outer duct contraction actuating mechanism 1, the duct contraction mechanism 2, the variable sealing ring mechanism 3 and the onboard computer, wherein the outer duct contraction actuating mechanism 1 is arranged outside the outer duct fan casing 4, the variable sealing ring mechanism 3 is arranged outside the inner duct casing 5, and the outer duct contraction actuating mechanism 1 is connected with the variable sealing ring mechanism 3 through the duct contraction mechanism 2; the on-board computer is used for controlling the operation of the outer duct contraction actuating mechanism 1; the structure main body of the duct shrinkage mechanism is of a bell-mouth type shrinkage and expansion structure and is of scale-like annular sheet structure distribution, the structure main body of the variable sealing ring mechanism is of a cylindrical structure, transition between the maximum size and the minimum size of the outer duct can be realized through the combination of the bell-mouth type shrinkage and expansion structure and the rear section cylindrical structure, and the bell-mouth type shrinkage and expansion structure and the rear section cylindrical structure are subjected to stepless adjustment synchronously according to height and speed change.
Preferably, as shown in fig. 10-14, the outer duct shrinkage actuating mechanism 1 comprises an actuating cylinder fixing ring 11, actuating cylinders 12 and an actuating slide block 13, the duct shrinkage mechanism 2 comprises a shrinkage inner plate 21, a shrinkage outer plate 22 and a shrinkage inner plate actuating slide rail 23, the actuating cylinder fixing ring 11 is arranged outside the outer duct fan casing 4, one end of the actuating cylinder fixing ring 11, which is close to the duct shrinkage mechanism 2, is connected with a plurality of shrinkage inner plates 21 distributed in an annular shape, the shrinkage inner plates 21 are connected to form a scale-like annular plate structure, and a plurality of actuating cylinders 12 which are in one-to-one correspondence with the shrinkage inner plates 21 are fixed on the actuating cylinder fixing ring 11; the outside of shrink interior piece 21 is provided with shrink outer piece 22, shrink interior piece action slide rail 23, and the one end of shrink outer piece 22 is connected with actuator cylinder 12, and the other end of shrink outer piece 22 is connected through action slider 13 with shrink interior piece action slide rail 23.
Preferably, as shown in fig. 10 to 16, the variable seal ring mechanism 3 includes a seal ring inner sheet 31, a seal ring outer sheet 32, a seal ring outer sheet stabilizing slider 33, and a seal ring inner sheet stabilizing slider 34, the plurality of seal ring inner sheets 31 are disposed outside the inner duct casing 5, and the plurality of seal ring inner sheets 31 are connected with the plurality of shrink inner sheets 21 in one-to-one correspondence, the seal ring outer sheet 32 is disposed between adjacent seal ring inner sheets 31, the seal ring outer sheet stabilizing slider 33 is disposed on a side surface of the seal ring outer sheet 32, and the seal ring inner sheet stabilizing slider 34 adapted to the seal ring outer sheet stabilizing slider 33 is disposed on an outer side surface of the seal ring inner sheet 31 adjacent to the seal ring outer sheet 32, so that a side edge of the seal ring inner sheet 31 can slide on an inner side surface of the seal ring outer sheet 32.
Preferably, the bypass stent 2 further comprises a sealing assembly disposed at the junction of adjacent stent struts 21.
Further preferably, the seal assembly comprises a shrink outer patch 24 and a shrink outer patch sled 25, the shrink outer patch 24 being connected to the ram securing ring 11 by the shrink outer patch sled 25; a shrink outer patch sliding rail 25 is arranged between adjacent shrink inner sheets 21;
the outer patch 24 slides along the outer patch slide rail 25 and expands and contracts with the outer patch 22 under the drive of the outer patch 22.
Preferably, as shown in fig. 13 and 14, one end of the shrink inner piece 21 away from the variable seal ring mechanism 3 is connected with the actuator cylinder fixing ring 11 through a first roller 26, and one half of the first roller 26 is fixedly connected with the actuator cylinder fixing ring 11, and the other half of the first roller 26 is rotatably connected with the shrink inner piece 21;
one end of the shrink outer patch slide rail 25 far away from the variable seal ring mechanism 3 is connected with the actuator cylinder fixing ring 11 through a second roller 27, and one half of the second roller 27 is fixedly connected with the actuator cylinder fixing ring 11, and the other half of the second roller 27 is rotatably connected with the shrink outer patch slide rail 25.
Preferably, as shown in fig. 13 and 14, one end of the inner shrink sheet 21 close to the variable seal ring mechanism 3 is connected with the inner seal ring sheet 31 through a third roller 28, and half of the third roller 28 is fixedly connected with the inner shrink sheet 21, and the other half of the third roller 28 is rotatably connected with the inner seal ring sheet 31;
one end of the shrink outer patch 24, which is close to the variable seal ring mechanism 3, is connected with the seal ring outer piece 32 through a fourth roller 29, and half of the fourth roller 29 is fixedly connected with the shrink outer patch 24, and the other half of the fourth roller 29 is rotatably connected with the seal ring outer piece 32.
Preferably, as shown in fig. 13 and 14, the retraction inner piece actuation slide 23 includes a fixing piece 231 and a first slide hole 232 that is formed on the fixing piece 231 and is obliquely arranged, and the fixing piece 231 is arranged on the outer wall of the retraction inner piece 21 and is positioned at one end close to the actuation cylinder fixing ring 11;
the shrinkage outer piece 22 comprises a sleeve 221 and a connecting piece 222 connected with the sleeve 221, one end of the actuator cylinder 12 is positioned in the sleeve 221, and the actuator cylinder 12 drives the sleeve 221 to move forwards and backwards under the action of an onboard computer; the connecting piece 222 is provided with an actuating slider 13 at one end far away from the sleeve 221, and the actuating slider 13 penetrates through the first sliding hole 232 and moves up and down along the first sliding hole 232 and can rotate relatively.
Preferably, as shown in fig. 10 and 11, the connecting piece 222 is a "U" shaped structural member, and two through holes symmetrically arranged are formed on two sides of the open end of the connecting piece; the actuating slider 13 has a cylindrical structure, and two ends thereof respectively pass through the two through holes and are fixedly connected with the connecting piece 222.
Preferably, as shown in fig. 15 and 16, a second sliding hole 341 is formed in the seal ring inner piece stabilizing sliding rail 34, and a moving block 331 is disposed at one end of the seal ring outer piece stabilizing sliding rail 33, which is close to the seal ring inner piece stabilizing sliding rail 34, and the moving block 331 slides in the second sliding hole 341.
Preferably, a shrink outer patch sliding rail 25 is arranged at the joint of two adjacent shrink inner sheets 21, the shrink outer patch sliding rail 25 is arranged at the outer side of an annular structure surrounded by a plurality of shrink inner sheets 21, and the shrink outer patch sliding rail 25 is connected with the two shrink inner sheets 21 through a first plane sliding mechanism; the first plane sliding mechanism includes a first chute 14 (ball head rail) provided on the shrink outer patch rail 25, and a first protrusion 15 (ball head) sliding along the first chute is provided between two adjacent shrink inner sheets 21, as shown in fig. 27.
Preferably, the connection part of the adjacent seal ring inner sheets 31 is provided with a seal ring outer sheet 32, the seal ring outer sheet 32 is arranged on the outer side of an annular structure surrounded by the plurality of seal ring inner sheets 31, and the seal ring outer sheet 32 is connected with the two seal ring inner sheets 31 through a second planar sliding mechanism; the second planar sliding mechanism includes a second runner 16 (ball guide) provided on the seal ring outer piece 32, and a second protrusion 17 (ball) sliding along the second runner is provided between adjacent two seal ring inner pieces 31, as shown in fig. 28.
The working principle of the above embodiment:
the actuator cylinder 12 is fixed on the actuator cylinder fixing ring 11, the airborne computer controls the actuator cylinder 12 to work, the actuator cylinder 12 pushes the contraction outer piece 22 and the actuator slide block 13 connected with the contraction outer piece 22 to reciprocate, and then the actuator slide block 13 slides along the first sliding hole 232 of the contraction inner piece actuating sliding rail 23, so that the contraction inner piece 21 connected with the contraction inner piece actuating sliding rail 23 is driven to contract and expand; under the drive of the shrinkage internal sheet 21, the shrinkage external patch 24 slides along the shrinkage external patch slide rail 25, so that the shrinkage external patch 24 and the shrinkage external patch slide rail 25 synchronously shrink and expand, and the inner air flow of the shrinkage external patch 24 and the shrinkage external patch slide rail 25 cannot leak to the outside;
through the arrangement of the sealing ring outer piece stabilizing sliding block 33 and the sealing ring inner piece stabilizing sliding rail 34, when the shrinkage inner piece 21 performs shrinkage and expansion movements, the sealing ring inner piece 31 and the sealing ring outer piece 32 are driven to perform expansion and shrinkage movements, and the inner air flows of the sealing ring inner piece 31 and the sealing ring outer piece 32 cannot leak to the outer side; meanwhile, as the outer piece stabilizing sliding block 33 and the inner piece stabilizing sliding rail 34 of the sealing ring are arranged on the outer side of the sealing ring structure, the outer piece stabilizing sliding block 33 of the sealing ring is fixed on the side surface of the outer piece 32 of the sealing ring, the inner piece stabilizing sliding rail 34 of the sealing ring is fixed on the outer side surface of the inner piece 31 of the sealing ring, and the moving plane of the sliding mechanism formed by the outer piece stabilizing sliding block 33 of the sealing ring is perpendicular to the axis of the engine, and slides mutually in the expanding and contracting movement process, so that the expanding and contracting movement of the inner piece 31 of the sealing ring and the outer piece 32 of the sealing ring is stabilized;
when the expansion and contraction movement of the inner sealing ring piece 31 and the outer sealing ring piece 32 is minimum, the inner side surfaces of the inner sealing ring piece 31 and the outer sealing ring piece 32 are completely attached to the outer side surface of the inner channel casing 5, so that the air flow inside the structure cannot leak to the outer side;
in the contraction and expansion process of the contraction inner sheet and the contraction outer sheet, a first plane sliding mechanism is arranged between the contraction outer patch sliding rail 25 and the two contraction inner sheets 21, so that the air flow passing loss is reduced, and the air flow inside the contraction inner sheets 21 and the contraction outer sheets 22 is ensured not to leak to the outside; the second planar sliding mechanism between the outer sealing ring sheet 32 and the inner sealing ring sheets 31 increases the air flow stability of the duct constriction mechanism 2 in the process of constriction and expansion and the tightness between the duct constriction mechanism and the inner duct when the air flow is contracted to the minimum; the sliding mechanism (seal ring outer piece stabilizing slider 33 and seal ring inner piece stabilizing slide rail 34) connecting between the seal ring outer piece 32 and the seal ring inner piece 31 increases the stability of the operation of the variable seal ring mechanism 3.
In summary, the present application has at least the following advantages:
1. the machine-mounted computer controls the actuating cylinder to perform reciprocating motion, so that the expansion and contraction motions of the inner contraction sheet, the inner sealing ring sheet and the outer sealing ring sheet are realized, the stepless regulation of the outer duct is further realized, and the high propulsion efficiency of the whole engine process is ensured;
when the aircraft gradually climbs from a take-off state to a high altitude and enters a supersonic cruise state, the mechanical adjusting device gradually contracts from a maximum duct state to a state that an outer duct is zero, the contraction amount is adjusted by FADEC according to a preset amount, the variable cycle of the engine is realized by using the stepless adjusting mechanism, and the variable cycle engine can have higher propulsion efficiency in a range from low speed, subsonic speed to supersonic speed;
2. the stepless regulating device avoids abrupt change and jump of the circulation parameters and ensures the working stability of the engine;
3. under the action of an onboard computer, the linear or nonlinear adjustment can be carried out according to different state parameters of the engine operation, so that the working performance of the variable bypass engine is ensured;
4. the shrinkage inner sheet and the shrinkage outer sheet in the shrinkage mechanism do not generate gaps in the stepless regulation process, so that the minimum air flow loss is effectively ensured;
5. the variable sealing ring mechanism can complete stepless regulation of air flow along with the duct contraction mechanism, so that the air flow stability of the duct contraction mechanism in the contraction and expansion process is improved.
Any combination of the technical features of the above embodiments may be performed (as long as there is no contradiction between the combination of the technical features), and for brevity of description, all of the possible combinations of the technical features of the above embodiments are not described; these examples, which are not explicitly written, should also be considered as being within the scope of the present description.
Claims (8)
1. The utility model provides a stepless adjusting device of variable cycle engine outer duct which characterized in that includes: the structure main body of the duct contraction mechanism is of a horn mouth type contraction and expansion structure and is distributed in a flake-like annular sheet structure, and the structure main body of the variable sealing ring mechanism is of a cylindrical structure;
the outer duct shrinkage actuating mechanism is arranged outside the outer duct fan casing, the variable sealing ring mechanism is arranged outside the inner duct casing, and the outer duct shrinkage actuating mechanism is connected with the variable sealing ring mechanism through the duct shrinkage mechanism; the airborne computer is used for controlling the operation of the outer duct contraction actuating mechanism;
the outer duct shrinkage actuating mechanism comprises an actuating cylinder fixing ring, an actuating cylinder and an actuating slide block, the duct shrinkage mechanism comprises a shrinkage inner piece, a shrinkage outer piece and a shrinkage inner piece actuating slide rail, the actuating cylinder fixing ring is arranged outside the outer duct fan casing, one end, close to the duct shrinkage mechanism, of the actuating cylinder fixing ring is connected with a plurality of shrinkage inner pieces in a scale-like annular sheet structure, and a plurality of actuating cylinders which are in one-to-one correspondence with the shrinkage inner pieces are fixed on the actuating cylinder fixing ring; the outer part of the shrinkage inner sheet is provided with a shrinkage outer sheet and a shrinkage inner sheet actuating slide rail, one end of the shrinkage outer sheet is connected with the actuating cylinder, and the other end of the shrinkage outer sheet is connected with the shrinkage inner sheet actuating slide rail through the actuating slide block;
the variable sealing ring mechanism comprises a sealing ring inner piece, a sealing ring outer piece stabilizing slide block and a sealing ring inner piece stabilizing slide rail, wherein a plurality of sealing ring inner pieces are arranged outside the inner channel casing, the plurality of sealing ring inner pieces are connected with the plurality of shrinkage inner pieces in a one-to-one correspondence manner, the sealing ring outer piece is arranged between the adjacent sealing ring inner pieces, the sealing ring outer piece stabilizing slide block is arranged on the side face of the sealing ring outer piece, and the sealing ring inner piece stabilizing slide rail matched with the sealing ring outer piece stabilizing slide block is arranged on the outer side surface of the sealing ring inner piece adjacent to the sealing ring outer piece;
the duct constriction mechanism further comprises a sealing assembly, and the sealing assembly is arranged at the joint of the adjacent constriction inner sheets.
2. The variable cycle engine outer duct stepless adjustment device of claim 1, wherein said seal assembly comprises a shrink outer patch and a shrink outer patch sled, said shrink outer patch being connected with said ram retaining ring by said shrink outer patch sled; the shrinkage outer patch sliding rail is arranged between the adjacent shrinkage inner sheets;
and under the drive of the shrinkage outer sheet, the shrinkage outer patch slides along the shrinkage outer patch sliding rail and expands and contracts along with the shrinkage outer sheet.
3. The variable cycle engine outer duct stepless adjustment device of claim 2, wherein one end of the contraction inner piece far away from the variable sealing ring mechanism is connected with the actuator cylinder fixing ring through a first roller, half of the first roller is fixedly connected with the actuator cylinder fixing ring, and the other half of the first roller is rotatably connected with the contraction inner piece;
one end of the shrinkage outer patch sliding rail far away from the variable sealing ring mechanism is connected with the actuator cylinder fixing ring through a second roller, one half of the second roller is fixedly connected with the actuator cylinder fixing ring, and the other half of the second roller is rotationally connected with the shrinkage outer patch sliding rail.
4. The stepless regulating device for the outer duct of the variable cycle engine according to claim 2 or 3, wherein one end of the contraction inner piece, which is close to the variable sealing ring mechanism, is connected with the sealing ring inner piece through a third roller, one half of the third roller is fixedly connected with the contraction inner piece, and the other half of the third roller is rotationally connected with the sealing ring inner piece;
one end of the shrinkage external patch, which is close to the variable sealing ring mechanism, is connected with the sealing ring external piece through a fourth roller, and half of the fourth roller is fixedly connected with the shrinkage external patch, and the other half of the fourth roller is rotationally connected with the sealing ring external piece.
5. The variable cycle engine outer duct stepless regulation device according to claim 2 or 3, wherein the contraction inner piece actuation slide rail comprises a fixing piece and a first slide hole which is arranged on the fixing piece in an inclined manner, and the fixing piece is arranged on the outer wall of the contraction inner piece and is positioned at one end close to an actuation cylinder fixing ring;
the telescopic outer piece comprises a sleeve and a connecting piece connected with the sleeve, one end of the actuating cylinder is positioned in the sleeve, and the actuating cylinder drives the sleeve to move forwards and backwards under the action of an onboard computer; the connecting piece is provided with the action slider far away from the one end of sleeve, the action slider runs through first slide hole to follow first slide hole reciprocates and can rotate relatively.
6. The stepless regulating device for the outer duct of the variable cycle engine according to claim 5, wherein the connecting piece is a U-shaped structural piece, and two symmetrically arranged through holes are formed on two sides of the opening end of the connecting piece; the actuating slide block is of a cylindrical structure, and two ends of the actuating slide block respectively penetrate through the two through holes and are fixedly connected with the connecting piece.
7. The stepless regulating device for the outer duct of the variable cycle engine according to claim 1, wherein the sealing ring inner piece stabilizing sliding rail is provided with a second sliding hole, one end of the sealing ring outer piece stabilizing sliding block, which is close to the sealing ring inner piece stabilizing sliding rail, is provided with a moving block, and the moving block slides in the second sliding hole.
8. The variable cycle engine outer duct stepless regulation device according to claim 2, wherein the joint of two adjacent shrink inner sheets is provided with the shrink outer patch slide rail, the shrink outer patch slide rail is arranged on the outer side of a ring structure surrounded by a plurality of shrink inner sheets, and the shrink outer patch slide rail is connected with the two shrink inner sheets through a first plane sliding mechanism;
the connecting part of the adjacent sealing ring inner sheets is provided with the sealing ring outer sheets, the sealing ring outer sheets are arranged on the outer side of an annular structure surrounded by the sealing ring inner sheets, and the sealing ring outer sheets are connected with the two sealing ring inner sheets through a second planar sliding mechanism.
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