CN116384156A - Method for improving applicability of close cone waverider by adjusting curvature distribution - Google Patents
Method for improving applicability of close cone waverider by adjusting curvature distribution Download PDFInfo
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- CN116384156A CN116384156A CN202310602317.1A CN202310602317A CN116384156A CN 116384156 A CN116384156 A CN 116384156A CN 202310602317 A CN202310602317 A CN 202310602317A CN 116384156 A CN116384156 A CN 116384156A
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Abstract
The invention discloses a method for improving applicability of an oscillometric body of an intimate cone by adjusting curvature distribution, and belongs to the field of hypersonic pneumatic layout design. The curvature radius distribution of the design curve ICC is readjusted in the close cone method, and the curvature radius length of ICC is extended at the close section without covering the FCT curve, so that the curvature radius in all the close sections covers the FCT curve; and simultaneously, the length of the curvature radius is adjusted to ensure that the distribution is continuous. The invention solves the problem that the design curve ICC in the design method of the close cone waverider cannot ensure continuous second derivative, so that the generated waverider curved surface has irregular conditions such as folds, sections and the like, can change certain inapplicable curves into applicable curves, expands the design space of the close cone waverider, improves the applicability of the close cone method, and simultaneously can improve the waverider volume by expanding the value of curvature.
Description
Technical Field
The invention belongs to the field of hypersonic pneumatic layout design, relates to a wave multiplier design direction, and particularly relates to a method for improving applicability of a close cone wave multiplier by adjusting curvature distribution.
Background
The waverider layout utilizes the hyperbolic characteristic of supersonic flow, prevents air flow leakage by attaching shock waves, has high lift-drag ratio in hypersonic state, and is one of the preferred shapes of the hypersonic aircraft at present. The traditional wedge-shaped flow and cone-shaped flow waverider is designed from a given flow field, the design space is relatively fixed, and the Sobiezky and the like propose a close cone method in 1992, so that the design space of the waverider is greatly expanded.
The theory of the intensity cone assumes: (1) The shape of the shock wave of the flow field in each close section is consistent with that of the designated shock wave; (2) lateral flow in adjacent close-coupled surfaces is sufficiently small. In the pyramid approach, there are two design curves: a shock wave exit profile (Inlet Capture Curve, ICC) determining the exit shape of the shock wave; a flow capture tube (Flow Capture Tube, FCT) is the starting point of the flowline tracking surface. The close cone method fits the flow field by the given shock wave outlet shape, so that a waverider is generated, the design flexibility is high, and a plurality of students develop a plurality of new methods and new shapes according to the design flexibility.
In the close-cone waver design approach, the curvature of the ICC curve determines the flow field in the close-cut plane, generally requiring a continuous distribution, i.e., a continuous second derivative of the ICC. However, sometimes the shock wave shape manually specified cannot ensure the continuity of the second derivative, and in many cases, curvature distribution is irregular, so that the generated wave-taking body curved surface has the conditions of folds, sections and the like, and even the wave-taking body construction cannot be realized. This limits the design space to some extent, reducing the applicability of the intimate cone method.
Disclosure of Invention
The technical solution of the invention is as follows: the method overcomes the defects of the prior art and improves the applicability of the close cone waverider by adjusting the curvature distribution.
The technical scheme of the invention is as follows:
in a first aspect, the present invention provides a method for improving the applicability of an oscillometric body by adjusting the curvature distribution, comprising:
at the close section without covering the FCT curve, extending the length of the curvature radius of ICC, so that the curvature radius in all close sections covers the FCT curve; and simultaneously, the length of the curvature radius is adjusted to ensure that the distribution is continuous.
Preferably, the radius of curvature length distribution is continuous, meaning that the radius of curvature length distribution function is continuous.
Preferably, the radius of curvature length distribution includes, but is not limited to, an equal value distribution, a linear distribution, a quadratic distribution.
Preferably, the length of the radius of curvature of the ICC affects the thickness and volume of the waver, and the smaller the length of the radius of curvature of the ICC, the greater the waver thickness and volume.
Preferably, when the value of the radius of curvature length of the ICC is smaller than the original radius of curvature length after adjustment, the volume of the waverider can be expanded.
In a second aspect, the present invention provides a device for improving the applicability of an oscillometric body by adjusting the curvature distribution, for implementing the method according to the first aspect.
In a third aspect, the present invention provides a terminal device, including:
a memory for storing instructions for execution by the at least one processor;
and a processor, configured to execute the instructions stored in the memory, and implement the method described in the first aspect.
In a fourth aspect, the present invention provides a computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.
Compared with the prior art, the invention has the beneficial effects that:
by adjusting the curvature distribution of ICC, certain curves which are not feasible originally can be used as ICC, so that the design space of the close cone waverider is expanded, and the applicability of the close cone method is improved.
By applying the method of the invention, the volume of the waverider can be expanded on the basis of keeping the waverider effect.
Drawings
FIG. 1 is a schematic view of the radius of curvature distribution of an embodiment of the present invention;
FIG. 2 is a graph showing the modified radius of curvature distribution of the present invention;
FIG. 3 shows the trailing edge section pressure distribution of the Model-F profile of the present inventionα=0°), wherein (a) is an unbonded flow field and (b) is a viscous flow field;
FIG. 4 is a schematic view showing the distribution of the present invention after shortening the radius of curvature.
Detailed Description
In the method for designing the oscillometric object, sometimes, the design curve ICC expressing the shape of the shock wave cannot ensure the continuity of the second derivative, so that the generated curved surface of the oscillometric object has irregular conditions such as folds, sections and the like, the construction of the oscillometric object cannot be realized, and the applicability of the oscillometric object is reduced.
The invention provides a method for improving applicability of a close cone waverider by adjusting curvature distribution, which artificially extends the length of the curvature radius of ICC (integrated circuit) at a close tangent plane without covering the curve of FCT (Flow Capture Tube, flow capturing tube) so that the curvature radius in all close tangent planes covers the curve of FCT. The value of the radius of curvature length is adjusted so that the distribution thereof is continuous.
Proper adjustment of the ICC curvature does not disrupt the waverider's waverider performance. Possible radius of curvature distributions include, but are not limited to, equal value distributions, linear distributions, and the like. The curvature radius length distribution being continuous means that the curvature radius length distribution function is continuous.
The radius of curvature of the ICC affects the thickness and volume of the waverider, with the smaller the length of the radius of curvature, the greater the waverider thickness and the greater the volume.
When the value of the length of the curvature radius of ICC is smaller than the length of the original curvature radius, the volume of the waverider can be expanded.
In the close-taper method, the size of the ICC curve radius of curvature length determines the dimensions of the tapered flow field in the close-cut plane: the larger the length of the radius of curvature, the larger the flow field scale, and the further the streamline tracking starting point is from the vertex of the conical flow; the smaller the length of the radius of curvature, the smaller the cone flow scale, and the closer the starting point of streamline tracking is to the cone flow vertex; however, when the length of the curvature radius is too small, the streamline tracking starting point is above the conical flow, which is equivalent to the streamline tracking starting point being outside the flow field, the streamline cannot be tracked to generate a wave multiplying surface.
The invention artificially extends the curvature radius length of ICC at the close section without covering the FCT curve, so that the curvature radius in all close sections covers the FCT curve, thereby improving the applicability of the close cone method. A specific approach is described by way of example. As shown in fig. 1, the ICC consists of a segment of circular arc and a curve, and the FCT curve is a straight line segment. As shown in fig. 1, the radius of curvature distribution of the ICC curve is calculated so that the FCT is not covered around the arc of the circle, and a multiplier cannot be generated, i.e., the curve is not applicable to the pyramid method. The radius of curvature length of this region is extended and may be linearly distributed as shown in fig. 2 to ensure smoothness of the radius of curvature distribution. The waverider profile generated at this time is designated as a Model-F (Feasible) profile. FIG. 3 shows the non-stick and viscous flow field pressure distribution for the trailing edge of the C-F profile, where (a) is the non-stick flow field and (b) is the viscous flow field. ICC-arc in fig. 3 is a circular arc segment ICC. The trailing edge shock wave can be seen to be well matched with the ICC curve, and the FCT serving as a straight line is also identical with the trailing edge section of the upper surface; no matter the flow field is an Euler or an N-S flow field, the shock wave attachment on the lower surface is obvious, the leakage of the air flow at the wing tip to the upper surface is less, and the good wave multiplication effect is ensured; in the N-S flow field of the same shape, the shock wave is more outside and the gas leaking to the top is slightly more than that of the Euler flow field.
In addition to improving the applicability of the close-fitting cone method, the method of the present invention for modifying the curvature distribution can also improve the volume of the waverider. Because the radius of curvature length of the ICC affects the thickness and volume of the waverider, the smaller the radius of curvature length, the larger the waverider thickness and the larger the volume; when the curvature value is adjusted to be larger than the original curvature, the volume of the waverider can be expanded. Fig. 4 shows a modification in which the radii of curvature are set to be the same length, and are the radii of the circular arc segments in fig. 1, so that the resultant profile is named Model-C (compact). Analysis of the flow field found that such treatment did not significantly destroy the waverider's performance. Table 1 shows performance comparison data for the C-F and C-C profiles, and the volume increase, although the Model-C profile lift-drag ratio is reduced, demonstrates that the invention is effective.
TABLE 1 lift-drag ratio and volume of wave bodies with different curvature distributions
The invention provides a method for resetting ICC curvature distribution to improve applicability of an intimate cone waverider, which mainly comprises 1) complementing shorter curvature radius to ensure that the curvature radius in all close-fitting surfaces covers FCT; 2) The curvature radius value is reset to ensure that the distribution is continuous, and irregular phenomena such as wrinkles, sections and the like are relieved. The curvature radius distribution of the design curve ICC (Inlet Capture Curve, shock wave outlet line) is readjusted in the close cone method, and some inapplicable curves can be changed into applicable curves, and common feasible curvature distributions include, but are not limited to, equivalent distribution, linear distribution and the like, and flow field simulation shows that the measures cannot greatly destroy the waverider effect, and meanwhile, the volume of the waverider can be expanded when the curvature radius length is adjusted to be smaller than the original curvature radius.
The invention also provides a device for improving the applicability of the close cone waverider by adjusting the curvature distribution, which is used for realizing the method.
The invention also provides a terminal device, comprising: a memory for storing instructions for execution by the at least one processor; and the processor is used for executing the instructions stored in the memory to realize the method.
The present invention also provides a computer readable storage medium storing computer instructions that, when run on a computer, cause the computer to perform the above method.
The invention is not described in detail in the field of technical personnel common knowledge.
Claims (8)
1. A method for improving the applicability of an oscillometric body by adjusting the curvature profile, comprising:
at the close section without covering the FCT curve, extending the length of the curvature radius of ICC, so that the curvature radius in all close sections covers the FCT curve; and simultaneously, the length of the curvature radius is adjusted to ensure that the distribution is continuous.
2. A method of improving the applicability of an oscillometric body by adjusting the curvature distribution according to claim 1, wherein: by continuous radius of curvature length distribution is meant that the radius of curvature length distribution function is continuous.
3. A method of improving the applicability of an oscillometric body by adjusting the curvature profile according to claim 2, wherein: radius of curvature length distribution includes, but is not limited to, equal value distribution, linear distribution, quadratic distribution.
4. A method of improving the applicability of an oscillometric body by adjusting the curvature distribution according to claim 1, wherein: the length of the radius of curvature of the ICC affects the thickness and volume of the waverider, and the smaller the length of the radius of curvature of the ICC, the greater the thickness of the waverider and the greater the volume.
5. A method of improving the applicability of an oscillometric body by adjusting the curvature distribution according to claim 1, wherein: when the value of the length of the curvature radius of the ICC is smaller than the length of the original curvature radius after adjustment, the volume of the waverider can be expanded.
6. A device for improving applicability of an oscillometric body by adjusting curvature distribution, comprising: for implementing the method of any one of claims 1-5.
7. A terminal device, comprising:
a memory for storing instructions for execution by the at least one processor;
a processor for executing instructions stored in a memory to implement the method of any one of claims 1-5.
8. A computer readable storage medium storing computer instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1-5.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106250607A (en) * | 2016-07-27 | 2016-12-21 | 中国航天空气动力技术研究院 | Double sweepback Waverider method for designing based on non-homogeneous B spline curve |
| US20200283169A1 (en) * | 2017-11-09 | 2020-09-10 | China Academy Of Aerospace Aerodynamics | Osculating cone theory-based fixed-plane waverider design method |
| CN113148222A (en) * | 2021-05-24 | 2021-07-23 | 北京航空航天大学 | Close curved surface wave-rider positive design method suitable for complex leading edge shape |
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- 2023-05-26 CN CN202310602317.1A patent/CN116384156B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106250607A (en) * | 2016-07-27 | 2016-12-21 | 中国航天空气动力技术研究院 | Double sweepback Waverider method for designing based on non-homogeneous B spline curve |
| US20200283169A1 (en) * | 2017-11-09 | 2020-09-10 | China Academy Of Aerospace Aerodynamics | Osculating cone theory-based fixed-plane waverider design method |
| CN113148222A (en) * | 2021-05-24 | 2021-07-23 | 北京航空航天大学 | Close curved surface wave-rider positive design method suitable for complex leading edge shape |
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