CN114528645A - Design method of hypersonic velocity aerodynamic thermal standard model for simulating three-dimensional complex flow - Google Patents
Design method of hypersonic velocity aerodynamic thermal standard model for simulating three-dimensional complex flow Download PDFInfo
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Abstract
The invention belongs to the field of hypersonic aerodynamic, and discloses a design method of a hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow. The design method of the aerodynamic thermal standard model comprises the following steps: establishing a basic model according to the characteristics of a plane-symmetric high-lift high-supersonic pneumatic profile; on the basis of basic model, build modification(ii) a On the basis of basic model, build modification(ii) a Design and processing basic model and modificationModification of the sameThe test model of (1); carrying out basic model and modificationModification of the sameThe hypersonic wind tunnel aerodynamic heat test; basic type and modified type of releaseModification of the sameThe pneumatic calibration model database. Basic model, modificationAnd modificationsThe method has the common characteristic of the current hypersonic aircraft, and a reliable pneumatic calibration model database can be established through numerical calculation and wind tunnel tests. The design method of the aerodynamic heat standard model has the characteristics of simplicity and practicability, and is suitable for designing the hypersonic aerodynamic heat standard model for wind tunnel tests, numerical simulation and flight tests.
Description
Technical Field
The invention belongs to the field of hypersonic aerodynamic, and particularly relates to a design method of a hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow.
Background
Hypersonic flight is the leading edge and focus of current aerospace research, and the violent motion of air and aircraft surface under hypersonic flight produces heat energy, forms "thermal barrier". The accuracy of the pneumatic thermal environment is directly related to the thermal protection design, the structural weight and the overall performance index of the aircraft, and is one of key technologies for restricting the development of the hypersonic aircraft.
In recent years, the hypersonic aerocraft is developed from a traditional axisymmetric simple appearance to a plane-symmetric high-lift complex configuration, and the surface flow of the aerocraft is more complex. Meanwhile, due to the presence of additional devices such as an air inlet channel and a control rudder, the prediction of the aerodynamic thermal environment with local complex interference flow faces a great challenge. At present, problems of low test precision (10% -15%), difficulty in effective verification of CFD numerical simulation results, difference between a wind tunnel simulation environment and a real flight environment and the like exist in pneumatic thermal environment prediction, and urgent solutions are needed.
The aerodynamic thermal standard model is a basic model providing "standard data" of an aerodynamic thermal environment. The standard model data can be used for evaluating the simulation capability/test technology of the test equipment, verifying the CFD algorithm/program, developing the heaven-earth correlation analysis and the like, and is basic data for supporting the hypersonic pneumatic problem research and improving the prediction accuracy of the pneumatic thermal environment. The rapid development of the hypersonic aircraft has urgent need for the construction of a hypersonic aerodynamic standard model, and particularly, an aerodynamic thermal standard model which is concerned with the problem of thermal barrier still has obvious defects at present. The existing pneumatic thermal standard model mainly has two types: background standard models with application development as background, and simple standard models such as ball head/double cone with test equipment/test technology verification as background. The former often has the background characteristics too strong to play the basic functions of the standard model; the latter has the single flow phenomenon, and is difficult to completely reflect the typical characteristics of hypersonic flow. Under the background, a hypersonic aerodynamic thermal standard model which can simulate typical hypersonic flow characteristics and is widely applicable to wind tunnel tests, numerical simulation and flight tests is urgently required to be developed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the development characteristics of a hypersonic aircraft and the high-precision prediction requirement of a pneumatic thermal environment, a hypersonic pneumatic thermal standard model design method for simulating three-dimensional complex flow is provided.
The invention discloses a design method of a hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow, which comprises the following steps of:
s10, establishing a basic model according to the characteristics of a plane-symmetric high-lift high-supersonic pneumatic appearance;
S40, designing and processing basic model and modifyingModification of the sameThe test model of (1);
s50, carrying out basic model and modificationModification of the sameThe hypersonic wind tunnel aerodynamic heat test;
s60, issuing basic model and modificationModification of the sameThe pneumatic calibration model database.
Further, the step S10 includes the following steps:
s11, simplifying the appearance of the hypersonic aircraft into a configuration of a blunt wedge and a conical side surface according to the appearance characteristics of the conventional hypersonic aircraft;
s12, determining parameters of a 'blunt wedge + conical side' configuration;
the flight direction of the hypersonic aircraft is taken as the front, and the configuration of the blunt wedge and the side surface of the cone is composed of a wedge body positioned in the middle and symmetrical semi-cones positioned at the two sides of the wedge body; the vertical symmetrical surface of the 'blunt wedge + conical side' configuration is an isosceles triangle with a reversed vertex angle and a vertical bottom edge, and the vertex angle of the isosceles triangle is(ii) a The horizontal symmetrical plane of the 'blunt wedge + conical side' configuration is an isosceles trapezoid with two inner angles at the upper bottom edge being rounded, and the included angle between the two sides of the isosceles trapezoid isThe width of the lower bottom edge is(ii) a The wedge body with the structure of 'blunt wedge + conical side surface' is symmetrical up and down, the upper and lower surfaces are all rectangular, the front end is rounded, and the length of the wedge body isA width ofA height ofThe included angle between the upper and lower surfaces of the wedge body isThe radius of the front end is(ii) a The length of the semi-cone with the configuration of 'blunt wedge + conical side surface' is alsoThe radius of the bottom surface of the semi-cone is(ii) a The junction of the wedge body and the semi-cone body is adoptedSpherical surface transition;
the wedge face compression angle defining the "blunt wedge + tapered flank" configuration isThe width of the model isThe height of the model isThe width of the wedge surface isThe radius of the leading edge is 、The wedge/cone length isEach parameter has the following constraint relationship:
s13, establishing a shape database of a 'blunt wedge + conical side' configuration;
by changing in stepsThe size of one variable is changed in a step mode, and a shape database of the configuration of the blunt wedge and the conical side surface, which meets the constraint relation of the step S12, is established;
s14, establishing a pneumatic thermal calculation database with a blunt wedge and conical side configuration;
modeling each blunt wedge and conical side configuration in the shape database of the blunt wedge and conical side configuration of the step S13, calculating aerodynamic thermal characteristics of each blunt wedge and conical side configuration including boundary layer flow state change and three-dimensional turbulence intensity change by adopting computational aerodynamics, and establishing an aerodynamic thermal calculation database of the blunt wedge and conical side configuration;
s15, determining a basic model;
in an aerodynamic heat calculation database of a 'blunt wedge + conical side' configuration, a 'blunt wedge + conical side' configuration which is closest to the aerodynamic characteristics of the existing hypersonic flight vehicle or a 'blunt wedge + conical side' configuration with required aerodynamic characteristics is searched and defined as a basic type;
further, the step S20 includes the following steps:
s21, on the basis of the basic model, adding a compression corner to form a 'basic model + compression corner' configuration;
the compression corner is a wedge body with the volume smaller than that of the basic wedge body, the compression corner is defined as a small wedge body, and the small wedge body is placed on the upper surface of the basic wedge body to obtain a 'basic shape + compression corner' configuration;
s22, determining parameters of a basic type and compression corner configuration;
the upper surface and the lower surface of the small wedge body are both rectangular, and the included angle between the upper surface and the lower surface of the small wedge body isThe widths of the rectangle on the upper surface and the rectangle on the lower surface of the small wedge body are both,The length of the rectangle on the lower surface of the small wedge isThe horizontal distance between the front edge of the small wedge and the front edge of the basic wedge isThe rear bottom surface of the small wedge body is flush with the rear bottom surface of the basic wedge body and is positioned on a vertical plane; defining a compression angle of the compression corner asWidth ofLength of;
S23, establishing a shape database with a 'basic type + compression corner' configuration;
by changing in stepsAdjusting the installation position of the compression corner; re-stagingAdjusting the compression angle to establish complianceA shape database of "base + compression corner" configurations of (a);
s24, establishing an aerodynamic heat calculation database with a basic type and compression corner configuration;
modeling each basic type + compression corner configuration in the shape database of the basic type + compression corner configuration in the step S23, calculating the aerodynamic heat characteristics including air inlet channel compression of each basic type + compression corner configuration by adopting computational aerodynamics, and establishing an aerodynamic heat calculation database of the basic type + compression corner configuration;
Finding the configuration of basic type and compression corner which is closest to the aerodynamic characteristics of the air inlet of the existing hypersonic aircraft or the configuration of basic type and compression corner with the required aerodynamic characteristics of the air inlet in an aerodynamic heat calculation database of the configuration of basic type and compression corner, and defining the configuration as a modification;
Further, the step S30 includes the following steps:
s31, adding an obtuse rudder on the basis of the basic model to form a basic model and obtuse rudder configuration;
the blunt rudder is a trapezoidal rudder sheet, and a rudder shaft is positioned on a vertical symmetrical plane of the basic model and is vertical to the upper surface of the wedge body of the basic model; fixing the trapezoidal rudder sheet on the upper surface of the basic wedge through a rudder shaft to obtain a basic + blunt rudder configuration;
s32, determining parameters of a basic type and an obtuse rudder configuration;
the upper surface and the lower surface of the blunt rudder are both parallel to the upper surface of the basic type wedge body, and the gap height between the lower surface of the blunt rudder and the upper surface of the basic type wedge body is(ii) a The sweep angle of the blunt rudder isA thickness ofHas a length ofThe front edge of the blunt rudder is rounded off(ii) a The diameter of the rudder shaft of the blunt rudder isThe length of the central line of the rudder shaft from the tail end of the blunt rudder is(ii) a The blunt rudder rotates around a rudder shaft, and after the blunt rudder rotates, the included angle between the vertical symmetrical plane of the blunt rudder and the flight direction is a rudder deflection angle(ii) a The horizontal distance between the front edge of the blunt rudder and the sharp point of the basic wedge body is;
S33, establishing a database of a basic type and blunt rudder configuration state;
first, a step change is madeAdjusting the installation position of the blunt rudder; second stepChange ofAdjusting the sweepback angle of the blunt rudder; step change againAdjusting the gap height of the blunt rudder to obtain a basic type and blunt rudder configuration; last step changeAdjusting the rudder deflection angle of the blunt rudder, and establishing a database of a 'basic type + blunt rudder' configuration state;
s34, establishing an aerodynamic heat calculation database in a basic type and blunt rudder configuration state;
modeling each basic type and blunt rudder configuration state in the database of the basic type and blunt rudder configuration state of the step S33, calculating aerodynamic heat characteristics of each basic type and blunt rudder configuration state including wing/body interference, rudder/body interference and rudder gap flow by adopting computational aerodynamics, and establishing an aerodynamic heat calculation database of the basic type and blunt rudder configuration state;
In an aerodynamic heat calculation database of the 'basic type + blunt rudder' configuration state, the 'basic type + blunt rudder' configuration closest to the interference aerodynamic characteristics of the rudder pieces of the existing hypersonic aircraft or the 'basic type + blunt rudder' configuration with the required interference aerodynamic characteristics of the rudder pieces is searched and defined as modification;
Further, the step S40 includes the following steps:
the method is characterized in that a hypersonic wind tunnel is inspected, and a special basic model and a special modification are designed and processed for the selected hypersonic wind tunnelModification of the sameThe test model is provided with a heat flow sensor or a pressure sensor;
further, the step S50 includes the following steps:
in the selected hypersonic wind tunnel, according to the predetermined test outline, the basic model and the modification are carried outModification of the sameThe hypersonic wind tunnel pneumatic heat test of the test model comprises the steps of respectively obtaining temperature data or pressure data through a heat flow sensor or a pressure sensor, and establishing a basic model and a modificationModification of the sameThe pneumatic standard model database;
further, the step S60 includes the following steps:
basic model and modificationModification of the sameThe pneumatic standard model database is released to the society as a basic model and a modification in the futureModification of the sameOr reference data of a wind tunnel test.
The model designed by the hypersonic aerodynamic thermal standard model design method for simulating three-dimensional complex flow can embody typical characteristics of lift body layout, complex wing/body interference, wing/rudder interference and the like of the current hypersonic aircraft, and can realize typical flow simulation of large-attack-angle streaming, shock wave/shock wave interference, shock wave/boundary layer interference, rudder gap flow and the like through reasonable test design; meanwhile, the method has the advantages of simplicity, universality and the like, and is favorable for developing tests and obtaining high-precision test data.
The designed hypersonic pneumatic thermal standard model comprises a basic model and a modified modelAnd modifications。
(1) The basic model has the following design principles:
a. the plane symmetry configuration has the layout characteristics of a lifting body;
the requirements of concise model appearance, practicability and high fault tolerance in the data acquisition process of the hypersonic pneumatic thermal standard model can be met.
b. The structure is simple, and the surface is smooth;
in the extremely short test time of the pulse wind tunnel, the flow field can be quickly established and the stable state is achieved, and the sensor is convenient to install and beneficial to the development of the wind tunnel test.
c. The parameters are adjustable;
basic type wedge surface compression angleWidth of wedge surfaceRadius of leading edge 、Tip wedge/cone lengthLEach parameter is adjustable, and the design can be flexibly carried out as required, so that the state simulation of boundary layer flow state change, three-dimensional turbulence intensity change and the like can be realized.
d. The expansibility is strong;
the plane symmetry configuration has a smooth wedge surface, so that the compression corner and the rudder can be conveniently installed, and the complicated interference flow simulation can be realized.
by adjusting the horizontal distance between the front edge of the small wedge and the front edge of the basic wedgeAdjusting the installation position of the compression corner; by adjusting the compression angleAnd carrying out different compression angle influence analysis.
by adjusting the horizontal distance between the front edge of the blunt rudder and the sharp point of the basic wedgeAdjusting the installation position of the blunt rudder; by adjusting the sweep angleAnalyzing the influence of different sweepback angles; by adjusting the gap heightResearching the height influence of different gaps; by adjusting the rudder deflection angle toStudy rudderThe declination angle.
The design method of the hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow, the designed basic model and the designed modificationAnd modificationsThe following flow characteristics can be simulated:
(1) simple standard model flow simulation such as a cylinder, a hemispherical head, a two-dimensional flat plate, a conical surface and the like;
(2) simulating three-dimensional turbulence under the layout and large attack angle of a lifting body;
(3) two-stage compression and shock wave/shock wave interference and shock wave/boundary layer interference flow simulation;
(4) and the dynamic simulation is disturbed due to the complex rudder gap and rudder/body interference.
According to the hypersonic aerodynamic thermal standard model design method for simulating three-dimensional complex flow, the designed basic model of 'blunt wedge + conical side surface' can simulate the basic characteristics of a lifting body aircraft, and the 'basic model + compression corner' modificationCan simulate the modification of the "basic model + blunt rudder" of the air intake compressionTypical complex flows such as wing/body disturbances, rudder gap flows, etc. can be simulated. Basic model, modificationAnd modificationsThe method has the common characteristic of the current hypersonic aircraft, and a reliable pneumatic heat calculation database can be established through numerical calculation and wind tunnel tests.
The design method of the hypersonic pneumatic thermal standard model for simulating three-dimensional complex flow adopts a parametric design method, has the characteristics of simplicity and practicability, and is suitable for designing the hypersonic pneumatic thermal standard model for wind tunnel tests, numerical simulation and flight tests.
Drawings
FIG. 1 is a flow chart of a hypersonic aerodynamic thermal standard model design method for simulating three-dimensional complex flow according to the invention;
FIG. 2 is a basic model designed by the design method of the hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow;
FIG. 3a is a design parameter of a basic model (front view);
FIG. 3b is a design parameter of the basic model (top view);
FIG. 4 is a modification of the design method of hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow according to the invention;
FIG. 6 is a modification of the design method of hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow according to the invention;
FIG. 8 is a modificationSurface and space pressure contour maps (0 ° angle of attack) flowing under Ma 12;
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in fig. 1, the design method of the hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow of the invention comprises the following steps:
s10, establishing a basic model according to the characteristics of a plane-symmetric high-lift high-supersonic pneumatic appearance;
S40, designing and processing basic model and modifyingModification of the sameThe test model of (1);
s50, carrying out basic model and modificationModification of the sameThe hypersonic wind tunnel aerodynamic heat test;
s60, issuing basic model and modificationModification of the sameThe pneumatic calibration model database.
Further, the step S10 includes the following steps:
s11, simplifying the appearance of the hypersonic aircraft into a configuration of 'blunt wedge + conical side' as shown in figure 2 according to the appearance characteristics of the existing hypersonic aircraft;
s12, determining parameters of a 'blunt wedge + conical side' configuration;
as shown in fig. 3a and 3b, the flight direction of the hypersonic flight vehicle is taken as the front, and the configuration of the "blunt wedge + conical side surface" is composed of a wedge body positioned in the middle and symmetrical semi-cones positioned at both sides of the wedge body; the vertical symmetrical surface of the 'blunt wedge + conical side' configuration is an isosceles triangle with a reversed vertex angle and a vertical bottom edge, and the vertex angle of the isosceles triangle is(ii) a The horizontal symmetrical plane of the 'blunt wedge + conical side' configuration is an isosceles trapezoid with two inner angles at the upper bottom edge being rounded, and the included angle between the two sides of the isosceles trapezoid isThe width of the lower bottom edge is(ii) a The wedge body with the structure of 'blunt wedge + conical side surface' is symmetrical up and down, the upper and lower surfaces are all rectangular, the front end is rounded, and the length of the wedge body isWith a width ofA height ofThe included angle between the upper surface and the lower surface of the wedge body isThe radius of the front end is(ii) a The length of the semi-cone with the configuration of 'blunt wedge + conical side surface' is alsoThe radius of the bottom surface of the semi-cone is(ii) a The junction of wedge and semi-cone adoptsSpherical surface transition;
the wedge face compression angle defining the "blunt wedge + tapered flank" configuration isThe width of the model isThe height of the model isThe width of the wedge surface isThe radius of the leading edge is 、The wedge/cone length isEach parameter has the following constraint relationship:
s13, establishing a shape database of a 'blunt wedge + conical side' configuration;
by changing in stepsThe size of one variable is changed in a step mode, and a shape database of the configuration of the blunt wedge and the conical side surface, which meets the constraint relation of the step S12, is established;
s14, establishing a pneumatic thermal calculation database with a blunt wedge and conical side configuration;
modeling each blunt wedge and conical side configuration in the shape database of the blunt wedge and conical side configuration of the step S13, calculating aerodynamic thermal characteristics of each blunt wedge and conical side configuration including boundary layer flow state change and three-dimensional turbulence intensity change by adopting computational aerodynamics, and establishing an aerodynamic thermal calculation database of the blunt wedge and conical side configuration;
s15, determining a basic model;
in an aerodynamic heat calculation database of a 'blunt wedge + conical side' configuration, a 'blunt wedge + conical side' configuration which is closest to the aerodynamic characteristics of the existing hypersonic flight vehicle or a 'blunt wedge + conical side' configuration with required aerodynamic characteristics is searched and defined as a basic type;
further, the step S20 includes the following steps:
s21, on the basis of the basic model, adding a compression corner to form a 'basic model + compression corner' configuration;
the compression corner is a wedge body with the volume smaller than that of the basic wedge body, and is defined as a small wedge body, and the small wedge body is placed on the upper surface of the basic wedge body to obtain the configuration of 'basic type + compression corner' shown in figure 4;
s22, determining parameters of a basic type and compression corner configuration;
as shown in fig. 5a and 5b, the upper surface and the lower surface of the small wedge are both rectangular, and the included angle between the upper surface and the lower surface of the small wedge isThe widths of the rectangle on the upper surface and the rectangle on the lower surface of the small wedge body are both,The length of the rectangle on the lower surface of the small wedge isThe horizontal distance between the front edge of the small wedge and the front edge of the basic wedge isThe rear bottom surface of the small wedge body is flush with the rear bottom surface of the basic wedge body and is positioned on a vertical plane; defining a compression angle of the compression corner asWidth ofLength of;
S23, establishing a shape database with a 'basic type + compression corner' configuration;
by changing in stepsAdjusting the installation position of the compression corner; re-stagingAdjusting the compression angle to establish coincidenceA shape database of "base + compression corner" configurations of (a);
s24, establishing an aerodynamic heat calculation database with a basic type and compression corner configuration;
modeling each basic type + compression corner configuration in the shape database of the basic type + compression corner configuration in the step S23, calculating the aerodynamic heat characteristics including air inlet channel compression of each basic type + compression corner configuration by adopting computational aerodynamics, and establishing an aerodynamic heat calculation database of the basic type + compression corner configuration;
In an aerodynamic heat calculation database of the basic type + compression corner configuration, the basic type + compression corner configuration which is closest to the aerodynamic characteristics of the air inlet of the existing hypersonic aircraft or the basic type + compression corner configuration with the required aerodynamic characteristics of the air inlet is searched and defined as the modification;
Further, the step S30 includes the following steps:
s31, adding an obtuse rudder on the basis of the basic model to form a basic model and obtuse rudder configuration;
the blunt rudder is a trapezoidal rudder sheet, and a rudder shaft is positioned on a vertical symmetrical plane of the basic model and is vertical to the upper surface of the wedge body of the basic model; fixing the trapezoidal rudder sheet on the upper surface of the basic wedge through a rudder shaft to obtain a basic type + blunt rudder configuration shown in figure 6;
s32, determining parameters of a basic type and an obtuse rudder configuration;
as shown in fig. 7a and 7b, the upper surface and the lower surface of the blunt rudder are parallel to the upper surface of the basic type wedge body, and the gap between the lower surface of the blunt rudder and the upper surface of the basic type wedge body has the height of(ii) a The sweep angle of the blunt rudder isA thickness ofHas a length ofThe front edge of the blunt rudder is rounded off(ii) a The diameter of the rudder shaft of the blunt rudder isThe length of the central line of the rudder shaft from the tail end of the blunt rudder is(ii) a The blunt rudder rotates around a rudder shaft, and after the rotation, the included angle between the vertical symmetrical plane of the blunt rudder and the flight direction is the rudder deflection angle(ii) a The horizontal distance between the front edge of the blunt rudder and the sharp point of the basic wedge body is;
S33, establishing a database of a basic type and blunt rudder configuration state;
first, a step change is madeAdjusting the installation position of the blunt rudder; second step changeAdjusting the sweepback angle of the blunt rudder; step change againAdjusting the gap height of the blunt rudder to obtain a basic type and blunt rudder configuration; last step changeAdjusting the rudder deflection angle of the blunt rudder, and establishing a database of the configuration state of 'basic type + blunt rudder';
s34, establishing an aerodynamic heat calculation database in a basic type and blunt rudder configuration state;
modeling each basic type and blunt rudder configuration state in the database of the basic type and blunt rudder configuration state of the step S33, calculating aerodynamic heat characteristics of each basic type and blunt rudder configuration state including wing/body interference, rudder/body interference and rudder gap flow by adopting computational aerodynamics, and establishing an aerodynamic heat calculation database of the basic type and blunt rudder configuration state;
In an aerodynamic heat calculation database of a basic type and blunt rudder configuration state, a rudder of the existing hypersonic aircraft is searchedThe configuration of 'basic type + blunt rudder' with the closest aerodynamic characteristics of blade interference or the configuration of 'basic type + blunt rudder' with the required aerodynamic characteristics of blade interference is defined as a modification;
Further, the step S40 includes the following steps:
the method is characterized in that a hypersonic wind tunnel is inspected, and a special basic model and a special modification are designed and processed for the selected hypersonic wind tunnelModification of the sameThe test model is provided with a heat flow sensor or a pressure sensor;
further, the step S50 includes the following steps:
in the selected hypersonic wind tunnel, according to the predetermined test outline, the basic model and the modification are carried outModification of the sameThe hypersonic wind tunnel pneumatic heat test of the test model comprises the steps of respectively obtaining temperature data or pressure data through a heat flow sensor or a pressure sensor, and establishing a basic model and a modificationModification of the sameThe pneumatic standard model database;
further, the step S60 includes the following steps:
basic model and modificationModification of the sameThe pneumatic standard model database is released to the society as a basic model and a modification in the futureModification of the sameOr reference data of a wind tunnel test.
Example 1
The hypersonic standard model example design is developed according to the design requirements, and comprises a basic model, a modification I design and a modification II design, wherein the basic dimensions are as follows:
a. basic type:the compression angle of the wedge surface and the half cone angle of the cone surface are 7 degrees, and the length of the pointed wedge/cone isThe width of the model isThe width of the wedge surface isThe height of the model isThe radius of the leading edge is1mm, 5mm and 20mm respectively;
b. modification I: on the basis of the basic model, a compression corner is added to form a 'basic model + compression corner' configuration, and the compression angle isCompressing corner widthLength ofThe horizontal distance between the front edge of the small wedge at the compression corner and the front edge of the basic wedge is;
c. Modification II: on the basis of the basic model, an obtuse rudder is added to form a basic model and obtuse rudder configuration; sweepback angle of blunt rudderLength, length ofThickness of the filmBlunt rudder with rounded front edgeDiameter of rudder shaftThe length of the central line of the rudder shaft from the tail end of the blunt rudder is(ii) a The height of the gap between the lower surface of the blunt rudder and the upper surface of the basic wedgeRespectively 2mm, 5mm and 8 mm; rudder deflection angle ofRespectively 0 degree and 10 degrees.
Claims (7)
1. The design method of the hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow is characterized by comprising the following steps of:
s10, establishing a basic model according to the characteristics of a plane-symmetric high-lift high-supersonic pneumatic appearance;
S40, designing and processing basic model and modifyingModification of the sameThe test model of (1);
s50, carrying out basic model and modificationModification of the sameThe hypersonic wind tunnel aerodynamic heat test;
2. The design method of hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow according to claim 1, wherein said step S10 includes the following steps:
s11, simplifying the appearance of the hypersonic aircraft into a configuration of a blunt wedge and a conical side surface according to the appearance characteristics of the conventional hypersonic aircraft;
s12, determining parameters of a 'blunt wedge + conical side' configuration;
the flight direction of the hypersonic aircraft is taken as the front, and the configuration of the blunt wedge and the side surface of the cone is composed of a wedge body positioned in the middle and symmetrical semi-cones positioned at the two sides of the wedge body; the vertical symmetrical surface of the 'blunt wedge + conical side' configuration is an isosceles triangle with a reversed vertex angle and a vertical bottom edge, and the vertex angle of the isosceles triangle is(ii) a The horizontal symmetrical plane of the 'blunt wedge + conical side' configuration is an isosceles trapezoid with two inner angles at the upper bottom edge being rounded, and the included angle between the two sides of the isosceles trapezoid isThe width of the lower bottom edge is(ii) a The wedge body with the structure of 'blunt wedge + conical side surface' is symmetrical up and down, the upper and lower surfaces are all rectangular, the front end is rounded, and the length of the wedge body isWith a width ofA height ofThe included angle between the upper surface and the lower surface of the wedge body isThe radius of the front end is(ii) a The length of the semi-cone with the configuration of 'blunt wedge + conical side surface' is alsoThe radius of the bottom surface of the semi-cone is(ii) a The junction of the wedge body and the semi-cone body is adoptedSpherical surface transition;
the wedge face compression angle defining the "blunt wedge + tapered flank" configuration isThe width of the model isThe height of the model isThe width of the wedge surface isThe radius of the leading edge is 、The wedge/cone length isEach parameter has the following constraint relationship:
s13, establishing a shape database of a 'blunt wedge + conical side' configuration;
by changing in stepsThe size of one variable is changed in a step mode, and a shape database of the configuration of the blunt wedge and the conical side surface, which meets the constraint relation of the step S12, is established;
s14, establishing a pneumatic thermal calculation database with a blunt wedge and conical side configuration;
modeling each blunt wedge and conical side configuration in the shape database of the blunt wedge and conical side configuration of the step S13, calculating aerodynamic thermal characteristics of each blunt wedge and conical side configuration including boundary layer flow state change and three-dimensional turbulence intensity change by adopting computational aerodynamics, and establishing an aerodynamic thermal calculation database of the blunt wedge and conical side configuration;
s15, determining a basic model;
in an aerodynamic heat calculation database of a 'blunt wedge + conical side' configuration, the 'blunt wedge + conical side' configuration which is closest to the aerodynamic characteristics of the existing hypersonic flight vehicle or the 'blunt wedge + conical side' configuration with the required aerodynamic characteristics is searched and defined as a basic type.
3. The design method of hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow according to claim 1, wherein said step S20 includes the following steps:
s21, on the basis of the basic model, adding a compression corner to form a 'basic model + compression corner' configuration;
the compression corner is a wedge body with the volume smaller than that of the basic wedge body, the compression corner is defined as a small wedge body, and the small wedge body is placed on the upper surface of the basic wedge body to obtain a 'basic shape + compression corner' configuration;
s22, determining parameters of a basic type and compression corner configuration;
the upper surface and the lower surface of the small wedge body are both rectangular, and the included angle between the upper surface and the lower surface of the small wedge body isThe widths of the rectangle on the upper surface and the rectangle on the lower surface of the small wedge body are both,The length of the rectangle on the lower surface of the small wedge isThe horizontal distance between the front edge of the small wedge and the front edge of the basic wedge isThe rear bottom surface of the small wedge body is flush with the rear bottom surface of the basic wedge body and is positioned on a vertical plane; defining a compression angle of the compression corner asWidth ofLength of;
S23, establishing a shape database with a 'basic type + compression corner' configuration;
by changing in stepsAdjusting the installation position of the compression corner; re-stagingAdjusting the compression angle to establish complianceA shape database of "base + compression corner" configurations of (a);
s24, establishing an aerodynamic heat calculation database with a basic type and compression corner configuration;
modeling each basic type + compression corner configuration in the shape database of the basic type + compression corner configuration in the step S23, calculating the aerodynamic heat characteristics including air inlet channel compression of each basic type + compression corner configuration by adopting computational aerodynamics, and establishing an aerodynamic heat calculation database of the basic type + compression corner configuration;
In an aerodynamic heat calculation database of the basic type + compression corner configuration, the basic type + compression corner configuration which is closest to the aerodynamic characteristics of the air inlet of the existing hypersonic aircraft or the basic type + compression corner configuration with the required aerodynamic characteristics of the air inlet is searched and definedFor retrofitting。
4. The design method of hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow according to claim 1, wherein said step S30 includes the following steps:
s31, adding an obtuse rudder on the basis of the basic model to form a basic model and obtuse rudder configuration;
the blunt rudder is a trapezoidal rudder sheet, and a rudder shaft is positioned on a vertical symmetrical plane of the basic model and is vertical to the upper surface of the wedge body of the basic model; fixing a trapezoidal rudder sheet on the upper surface of a basic wedge through a rudder shaft to obtain a basic + blunt rudder configuration;
s32, determining parameters of a basic type and an obtuse rudder configuration;
the upper surface and the lower surface of the blunt rudder are both parallel to the upper surface of the basic type wedge body, and the gap height between the lower surface of the blunt rudder and the upper surface of the basic type wedge body is(ii) a The sweep angle of the blunt rudder isA thickness ofHas a length ofThe front edge of the blunt rudder is rounded off(ii) a The diameter of the rudder shaft of the blunt rudder isThe length of the central line of the rudder shaft from the tail end of the blunt rudder is(ii) a The blunt rudder rotates around a rudder shaft, and after the blunt rudder rotates, the included angle between the vertical symmetrical plane of the blunt rudder and the flight direction is a rudder deflection angle(ii) a The horizontal distance between the front edge of the blunt rudder and the sharp point of the basic wedge body is;
S33, establishing a database of a basic type and blunt rudder configuration state;
first, a step change is madeAdjusting the installation position of the blunt rudder; second step changeAdjusting the sweepback angle of the blunt rudder; step change againAdjusting the gap height of the blunt rudder to obtain a basic type and blunt rudder configuration; last step changeAdjusting the rudder deflection angle of the blunt rudder, and establishing a database of the configuration state of 'basic type + blunt rudder';
s34, establishing an aerodynamic heat calculation database in a basic type and blunt rudder configuration state;
modeling each basic type and blunt rudder configuration state in the database of the basic type and blunt rudder configuration state of the step S33, calculating aerodynamic heat characteristics of each basic type and blunt rudder configuration state including wing/body interference, rudder/body interference and rudder gap flow by adopting computational aerodynamics, and establishing an aerodynamic heat calculation database of the basic type and blunt rudder configuration state;
In an aerodynamic heat calculation database of the 'basic type + blunt rudder' configuration state, the 'basic type + blunt rudder' configuration closest to the interference aerodynamic characteristics of the rudder pieces of the existing hypersonic aircraft or the 'basic type + blunt rudder' configuration with the required interference aerodynamic characteristics of the rudder pieces is searched and defined as modification。
5. The design method of the hypersonic aerodynamic thermal standard model for simulating the three-dimensional complex flow as claimed in claim 1, wherein said step S40 includes the following steps:
6. The design method of hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow according to claim 1, wherein said step S50 includes the following steps:
in the selected hypersonic wind tunnel, according to the predetermined test outline, the basic model and the modification are carried outModification of the sameThe hypersonic wind tunnel pneumatic heat test of the test model comprises the steps of respectively obtaining temperature data or pressure data through a heat flow sensor or a pressure sensor, and establishing a basic model and a modificationModification of the sameThe pneumatic calibration model database.
7. The design method of hypersonic aerodynamic thermal standard model for simulating three-dimensional complex flow according to claim 1, wherein said step S60 includes the following steps:
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