CN114547797A - Mode selection intermediary casing internal and external culvert flow path configuration method - Google Patents
Mode selection intermediary casing internal and external culvert flow path configuration method Download PDFInfo
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Abstract
The application belongs to the technical field of inner and outer culvert flow path configurations of a mode selection intermediary casing, and particularly relates to an inner and outer culvert flow path configuration method of the mode selection intermediary casing, which comprises the steps of constructing an inner culvert flow path curve A1 ' B1 ' C1 '; constructing a bypass external flow path curve A1B1C1 before the mode selection valve; constructing a curve C1OD1 when the mode selector valve is open; the curve C1OD1 is rotated by an angle α to obtain a curve C1O 'D1' when the mode selector valve is closed, and design f (C1) ═ af (C1)0)+bf(C1O′) Where f (C1) is the slope of the bypass outside flow path curve A1B1C1 at C1 before the mode select valve, f (C1)0) Is the slope at C1, f (C1) of the curve C1OD1 when the mode select valve is open0′) When the mode selection valve is closedThe slope of the curve C1O 'D1' at C1, a and b are coefficients between 0 and 1, and a culvert external flow path curve D1D2E1 behind the construction mode selection valve is constructed; constructing an external culvert internal flow path curve D1 ' D2 ' E1 '; an connotative outer flow path curve D1 ' E ' E ' was constructed.
Description
Technical Field
The application belongs to the technical field of inner and outer culvert flow path configuration of a mode selection intermediary casing, and particularly relates to an inner and outer culvert flow path configuration method of the mode selection intermediary casing.
Background
In order to enable the aircraft engine to keep better performance under multiple working conditions, the configuration intermediate casing comprises an inner culvert flow path and an outer culvert flow path, and a mode selection mechanism is used for controlling a mode selection valve to be opened or closed and correspondingly opening or closing the outer culvert flow path, so that the distribution of flow among the inner culvert flow path and the outer culvert flow path can be controlled to match the working conditions of the aircraft engine, and the aircraft engine can keep better performance.
At present, the configuration of the culvert flow path inside and outside the intermediate casing comprises an inner culvert flow path curve configuration, an inner culvert outer flow path curve configuration, a mode selection valve front culvert outer flow path curve configuration, a mode selection valve rear culvert outer flow path curve configuration and an outer culvert inner flow path curve configuration.
The present application has been made in view of the above-mentioned technical drawbacks.
It should be noted that the above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and the above background disclosure should not be used for evaluating the novelty and inventive step of the present application without explicit evidence to suggest that the above content is already disclosed at the filing date of the present application.
Disclosure of Invention
It is an object of the present application to provide a method of mode selecting an intermediate casing culvert flow path configuration that overcomes or mitigates at least one aspect of the technical disadvantages known to exist.
The technical scheme of the application is as follows:
a method for configuring a culvert flow path inside and outside a mode selection intermediary casing comprises the following steps:
determining a slope f (A1 ') at A1' and a slope f (C1 ') at C1' by taking A1 'as a starting point and C1' as an end point, and selecting a free control point B1 'from A1' and C1 'to construct an internal flow path curve A1' B1 'C1';
determining the slope f (A1) at the position A1 by taking A1 as a starting point and C1 as an end point, selecting a free control point B1 from A1 and C1, and constructing a bypass external flow path curve A1B1C1 in front of the mode selection valve;
selecting a free control point O from C1 and D1 by taking C1 as a starting point and D1 as an end point, and constructing a curve C1OD1 when the mode selection valve is opened; rotating the curve C1OD1 by an angle alpha to obtain a curve C1O 'D1' when the mode selection valve is closed; design f (C1) ═ af (C1)0)+bf(C1O′) Where f (C1) is the slope of the bypass outside flow curve A1B1C1 at C1 before the mode select valve, f (C1)0) Is the slope at C1, f (C1) of the curve C1OD1 when the mode select valve is open0′) For the slope at C1 of the curve C1O 'D1' when the mode select valve is closed, a, b are coefficients between 0-1;
determining a slope f (D1) at a D1 position and a slope f (E1) at an E1 position by taking D1 as a starting point and E1 as an end point, selecting a free control point D2 in D1 and E1, and constructing a bypass external flow path curve D1D2E1 behind a mode selection valve;
the slope f (D1 ' at D1 ' was determined using D1 ' as the starting point and E1 ' as the end point 'D2) The slope f (E1 ') at E1' selects a free control point D2 'in D1 and E1 to construct an extravagant flow path curve D1' D2 'E1';
with D1 ' as the starting point and E ' as the end point, the slope f (D1 ') at D1 ' was determined 'E″) And E ', selecting a free control point E ' in D1 ' and E ', and constructing an inner-content outer flow path curve D1 ' E ' E '.
According to at least one embodiment of the present application, in the above method for configuring the bypass flow path inside and outside the mode-selecting intermediate casing, the bypass inner flow path curve A1 'B1' C1 ', the bypass outer flow path curve A1B1C1 before the mode-selecting valve, the curve C1OD1 when the mode-selecting valve is opened, the bypass outer flow path curve D1D2E1 after the mode-selecting valve, the bypass inner flow path curve D1' D2 'E1', and the bypass outer flow path curve D1 'E ″ E' conform to a cubic curve control equation or a bezier curve control equation.
According to at least one embodiment of the present application, in the above method for configuring the bypass flow path inside and outside the mode selection intermediary casing, a plurality of inspection cross sections of the bypass flow path between D1 ' and E ' are selected, and if the inspection cross sections of the bypass flow path do not conform to the decreasing conditions, the curves a1 ' B1 ' C1 ' and D1 ' E "E ' are readjusted.
According to at least one embodiment of the present application, in the above method for configuring the bypass flow path inside and outside the mode selection intermediary casing, a plurality of inspection cross sections of the bypass flow path between D1 and E1 are selected, and if there is a check cross section of the bypass flow path with a cross sectional area smaller than the minimum required flow area of the bypass flow path, the curve of the bypass flow path after the mode selection valve is readjusted to be D1D2E1 and the curve of the bypass flow path inside and outside D1 ' D2 ' E1 '.
According to at least one embodiment of the present application, in the above method for configuring the bypass flow path inside and outside the mode selection intermediate casing, CFD simulation is performed on the bypass flow path inside and outside the mode selection intermediate casing determined by the bypass inner flow path curve A1 'B1' C1 ', the bypass outer flow path curve A1B1C1 before the mode selection valve, the curve C1OD1 when the mode selection valve is opened, the bypass outer flow path curve D1D2E1 after the mode selection valve, the bypass inner flow path curve D1' D2 'E1', and the bypass outer flow path curve D1 'E ″ E', and if the bypass flow path pressure loss does not satisfy the requirement when the mode selection valve is closed, or if the bypass flow path pressure loss does not satisfy the requirement when the mode selection valve is opened, adjustment is performed again.
Drawings
FIG. 1 is a schematic illustration of a method for mode selecting an intermediate casing culvert flow path configuration according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a plurality of inspection cross sections of the content flow path between D1 'and E' according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a plurality of inspection cross sections of the bypass flow path between D1 and E1 according to an embodiment of the present disclosure.
For the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; in addition, the drawings are used for illustrative purposes, and the positional relationship is only for illustrative purposes and is not to be construed as limiting the patent.
Detailed Description
In order to make the technical solutions and advantages of the present application clearer, the technical solutions of the present application will be further clearly and completely described in the following detailed description with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only some of the embodiments of the present application, and are only used for explaining the present application, but not limiting the present application. It should be noted that, for convenience of description, only the parts related to the present application are shown in the drawings, other related parts may refer to general configurations, and the embodiments and technical features in the embodiments in the present application may be combined with each other to obtain a new embodiment without conflict.
In addition, unless otherwise defined, technical or scientific terms used in the description of the present application shall have the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", and the like used in the description of the present application, which indicate orientations, are used only to indicate relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly, and thus, should not be construed as limiting the present application. The use of "first," "second," "third," and the like in the description of the present application is for descriptive purposes only to distinguish between different components and is not to be construed as indicating or implying relative importance. The use of the terms "a," "an," or "the" and similar referents in the context of describing the application is not to be construed as an absolute limitation on the number, but rather as the presence of at least one. The word "comprising" or "comprises", and the like, when used in this description, is intended to specify the presence of stated elements or items, but not the exclusion of other elements or items.
Further, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and the like are used in the description of the invention in a generic sense, e.g., connected as either a fixed connection or a removable connection or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in this application according to the specific situation.
The present application is described in further detail below with reference to fig. 1 to 3.
A method for configuring a culvert flow path inside and outside a mode selection intermediary casing comprises the following steps:
determining a slope f (A1 ') at A1' and a slope f (C1 ') at C1' by taking A1 'as a starting point and C1' as an end point, and selecting a free control point B1 'from A1' and C1 'to construct an internal flow path curve A1' B1 'C1';
determining the slope f (A1) at the position A1 by taking A1 as a starting point and C1 as an end point, selecting a free control point B1 from A1 and C1, and constructing a bypass external flow path curve A1B1C1 in front of the mode selection valve;
selecting a free control point O from C1 and D1 by taking C1 as a starting point and D1 as an end point, and constructing a curve C1OD1 when the mode selection valve is opened; rotating the curve C1OD1 by an angle alpha to obtain a curve C1O 'D1' when the mode selection valve is closed; design f (C1) ═ af (C1)0)+bf(C1O′) Where f (C1) is the slope of the bypass outside flow curve A1B1C1 at C1 before the mode select valve, f (C1)0) Is the slope at C1, f (C1) of the curve C1OD1 when the mode select valve is open0′) For the slope at C1 of the curve C1O 'D1' when the mode select valve is closed, a, b are coefficients between 0-1;
determining the slope f (D1) at D1 by taking D1 as a starting point and E1 as an end point, taking the slope of a curve C1OD1 at D1 when the mode selector valve is opened and determining the slope f (E1) at E1, selecting a free control point D2 in D1 and E1, and constructing a bypass external flow path curve D1D2E1 behind the mode selector valve;
the slope f (D1 ' at D1 ' was determined using D1 ' as the starting point and E1 ' as the end point 'D2) Specifically, can take
Determining a slope f (E1 ') at E1', selecting a free control point D2 'in D1 and E1, and constructing an external bypass internal flow path curve D1' D2 'E1';
with D1 ' as the starting point and E ' as the end point, the slope f (D1 ') at D1 ' was determined 'E"), and the slope f (E ') at E', selecting a free control point E 'in D1' and E1 ', and constructing an inner-content outer flow path curve D1' E 'E'.
With respect to the method for configuring the bypass flow path inside and outside the mode selection intermediate casing disclosed in the above embodiments, it will be understood by those skilled in the art that, the design of the model selection intermediate casing internal and external bypass flow paths is determined by an internal bypass flow path curve A1 ' B1 ' C1 ', a mode selection valve front external bypass flow path curve A1B1C1, a curve C1OD1 when the mode selection valve is opened, a mode selection valve rear external bypass flow path curve D1D2E1, an external bypass internal flow path curve D1 ' D2 ' E1 ', an internal bypass external flow path curve D1 ' E ' E1 ', the starting point, the end point and the slope thereof may be the actual starting point, the actual end point and the slope thereof of the corresponding curve, or the starting point, the end point and the slope thereof of the corresponding curve design, the control point may be the typical position point on the corresponding curve, or the typical position point designed on the corresponding curve, the configuration boundary is clear, and the efficiency for the configuration of the culvert flow path inside and outside the mode selection intermediate casing is higher.
For the configuration method of bypass flow path inside and outside the mode selection intermediate casing disclosed in the above embodiment, it can be further understood by those skilled in the art that it is constructed with the curve C1OD1 when the mode selection valve is opened, the length of the curve may specifically be the actual length of the mode selection valve, or the design length, and with the curve rotation angle α, the curve C1O 'D1' when the mode selection valve is closed is obtained, and the rotation angle α may specifically be the actual rotation angle when the mode selection valve is closed, or the design rotation angle, and based on this, f (C1) ═ af (C1)0)+bf(C1O′) Where f (C1) is the slope of the bypass outside flow curve A1B1C1 at C1 before the mode select valve, f (C1)0) Is the slope at C1, f (C1) of the curve C1OD1 when the mode select valve is open0′) The slope of a curve C1O 'D1' at a position C1 when the mode selection valve is closed is represented as a coefficient, a and b are coefficients between 0 and 1, a positively relates to the continuity of the curvature of an outer bypass flow path when the mode selection valve is opened, and b positively relates to the continuity of the curvature of an inner bypass flow path when the mode selection valve is closed, and can be adjusted and balanced according to the flow conditions of the inner bypass flow path and the outer bypass flow path, so that the smoothness of the inner bypass flow path and the outer bypass flow path of the mode selection intermediary case when the mode selection valve is opened and closed is ensured, and the performance of the aero-engine is ensured.
In some optional embodiments, in the above method for configuring the bypass flow path inside and outside the mode-selecting intermediate casing, the bypass inner flow path curve A1 'B1' C1 ', the bypass outer flow path curve A1B1C1 before the mode-selecting valve, the curve C1OD1 when the mode-selecting valve is opened, the bypass outer flow path curve D1D2E1 after the mode-selecting valve, the bypass inner flow path curve D1' D2 'E1', and the bypass outer flow path curve D1 'E "E' conform to a cubic curve control equation or a bezier curve control equation.
In some optional embodiments, in the above method for configuring the bypass flow path inside the mode selection intermediary casing, a plurality of inspection cross sections of the bypass flow path between D1 'and E' are selected, and if the inspection cross section areas of the bypass flow paths do not meet the condition of gradually decreasing in sequence, the inner flow path curve a1 'B1' C1 'and the outer flow path curve D1' E 'are readjusted, specifically, the slope f (a 1') at a1 ', the slope f (C1') at C1 ', the position of the free control point B1', and the slope f (D1 'at D1'E″) The slope f (E ') at E', the position of the free control point E ", and the corresponding curve control the parameters of the equation to ensure that the content flow path continues to contract, with higher performance when the mode select valve is closed.
In some optional embodiments, in the above method for configuring bypass flow paths in a mode-selecting intermediate casing, a plurality of inspection cross sections of the bypass flow paths are selected between D1 and E1, and if the inspection cross sections have a cross-sectional area smaller than the minimum bypass flow path size, the inspection cross sections need to be selectedWhen the bypass flow path inspection cross-section of the flow area is obtained, the mode selector valve post-bypass outside flow path curve D1D2E1 and the bypass inside flow path curve D1 'D2' E1 'may be readjusted, specifically, the slope f (D1) at D1, the slope f (E1) at E1, the position of the free control point D2, and the slope f (D1') at D1 'may be adjusted'D2) The slope f (E1 ') at E1 ', the position of the free control point D2 ', and the parameters of the corresponding curve control equation to ensure the flow capacity of the bypass flow path and avoid the occurrence of congestion.
In some optional embodiments, in the method for configuring the bypass flow path inside and outside the mode-selection intermediate casing, CFD simulation is performed on the bypass flow path inside and outside the mode-selection intermediate casing determined by the curve A1 'B1' C1 ', the curve A1B1C1 before the mode-selection valve, the curve C1OD1 when the mode-selection valve is opened, the curve D1D2E1 after the mode-selection valve, the curve D1' D2 'E1' and the curve D1 'E "E', if the pressure loss of the bypass flow path does not satisfy the requirement when the mode-selection valve is closed, or the pressure loss of the bypass flow path and the curve D2 'E' is opened, the CFD simulation is performed again to ensure that the bypass flow path inside and outside the mode-selection intermediate casing has higher performance, and the CFD simulation method may be used to obtain the bypass flow path inside and outside the mode-selection intermediate casing by screening from a plurality of mode-selection intermediate casings, The pressure loss of the culvert flow path is small, and the circulation capacity of the culvert flow path is large.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Having thus described the present application in connection with the preferred embodiments illustrated in the accompanying drawings, it will be understood by those skilled in the art that the scope of the present application is not limited to those specific embodiments, and that equivalent modifications or substitutions of related technical features may be made by those skilled in the art without departing from the principle of the present application, and those modifications or substitutions will fall within the scope of the present application.
Claims (5)
1. A method for configuring a culvert flow path inside and outside a mode selection intermediary casing is characterized by comprising the following steps:
determining a slope f (A1 ') at A1' and a slope f (C1 ') at C1' by taking A1 'as a starting point and C1' as an end point, and selecting a free control point B1 'from A1' and C1 'to construct an internal flow path curve A1' B1 'C1';
determining a slope f (A1) at the position A1 by taking A1 as a starting point and C1 as an end point, selecting a free control point B1 in A1 and C1, and constructing a bypass external flow path curve A1B1C1 in front of the mode selection valve;
selecting a free control point O from C1 and D1 by taking C1 as a starting point and D1 as an end point, and constructing a curve C1OD1 when the mode selection valve is opened; rotating the curve C1OD1 by an angle alpha to obtain a curve C1O 'D1' when the mode selection valve is closed; design f (C1) ═ af (C1)0)+bf(C1O′) Where f (C1) is the slope of the mode select valve nose bypass outer flow path curve A1B1C1 at C1, and f (C1)0) Is the slope at C1, f (C1) of the curve C1OD1 when the mode select valve is open0′) For the slope at C1 of the curve C1O 'D1' when the mode select valve is closed, a, b are coefficients between 0-1;
determining a slope f (D1) at a D1 position and a slope f (E1) at an E1 position by taking D1 as a starting point and E1 as an end point, selecting a free control point D2 in D1 and E1, and constructing a bypass external flow path curve D1D2E1 behind a mode selection valve;
the slope f (D1 ' at D1 ' was determined using D1 ' as the starting point and E1 ' as the end point 'D2) The slope f (E1 ') at E1' selects a free control point D2 'in D1 and E1 to construct an extravagant flow path curve D1' D2 'E1';
with D1 ' as a starting point and E ' as an end point, the slope f (D1 ') at D1 ' was determined 'E″) And E ', selecting a free control point E ' in D1 ' and E ', and constructing an connotative outer flow path curve D1 ' E ' E '.
2. The method of claim 1, wherein said method of configuring said bypass flow path in said mode selection intermediate casing,
the inner bypass flow path curve A1 'B1' C1 ', the outer bypass flow path curve A1B1C1 before the mode selector valve, the curve C1OD1 when the mode selector valve is opened, the outer bypass flow path curve D1D2E1 after the mode selector valve, the inner bypass flow path curve D1' D2 'E1', and the outer bypass flow path curve D1 'E "E' conform to a cubic curve control equation or a bezier curve control equation.
3. The method of claim 1, wherein said method of configuring said bypass flow path in said mode selection intermediate casing,
and selecting a plurality of inspection cross sections of the content flow paths between D1 'and E', and if the inspection cross section areas of the content flow paths do not conform to the condition of gradually decreasing in sequence, readjusting the content inner flow path curve A1 'B1' C1 'and the content outer flow path curve D1' E 'E'.
4. The method of claim 1, wherein said method of configuring said bypass flow path in said mode selection intermediate casing,
and selecting a plurality of bypass flow path inspection cross sections between D1 and E1, and if the bypass flow path inspection cross sections with the cross section areas smaller than the minimum required flow area of the bypass flow path exist, readjusting the mode selection valve to obtain a bypass outer flow path curve D1D2E1 and a bypass inner flow path curve D1 ' D2 ' E1 '.
5. The method of claim 1, wherein said method of configuring said bypass flow path in said mode selection intermediate casing,
CFD simulation is carried out on the inner culvert flow path curve A1 'B1' C1 ', the outer culvert flow path curve A1B1C1 before the mode selection valve, the curve C1OD1 when the mode selection valve is opened, the outer culvert flow path curve D1D2E1 after the mode selection valve, the inner culvert flow path curve D1' D2 'E1' and the inner culvert flow path curve D1 'E1', and the inner culvert flow path and the outer culvert flow path are determined, if the pressure loss of the inner culvert flow path does not meet the requirement when the mode selection valve is closed, or if the pressure loss of the inner culvert flow path and the outer culvert flow path does not meet the requirement when the mode selection valve is opened, adjustment is carried out again.
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