CN111173619B - Inward-rotating air inlet channel and V-shaped blunt front edge thereof - Google Patents
Inward-rotating air inlet channel and V-shaped blunt front edge thereof Download PDFInfo
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- CN111173619B CN111173619B CN201911330147.6A CN201911330147A CN111173619B CN 111173619 B CN111173619 B CN 111173619B CN 201911330147 A CN201911330147 A CN 201911330147A CN 111173619 B CN111173619 B CN 111173619B
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- 238000002161 passivation Methods 0.000 claims abstract description 40
- 230000007423 decrease Effects 0.000 claims abstract description 6
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- 230000035939 shock Effects 0.000 description 21
- 230000006835 compression Effects 0.000 description 6
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/042—Air intakes for gas-turbine plants or jet-propulsion plants having variable geometry
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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- Measuring Volume Flow (AREA)
Abstract
The invention discloses a V-shaped blunt leading edge of an inward turning type air inlet channel, which comprises a conical curve section and a straight leading edge section; the number of the straight front edge sections is two, and the straight front edge sections and the two straight front edge sections are respectively connected with the two ends of the conical curve section in a smooth tangent way to form a V shape; the passivation radius at the central position of the conical curve section is r1, the passivation radius at the position of the tangent point of the conical curve section and the straight front edge section is r2, wherein r1 is larger than r2, and the passivation radius of the front edge of the conical curve section continuously decreases from the central position to the tangent points at the two sides. In the V-shaped blunt leading edge, the radius of the tapered curve segment continuously decreases from the center position to the leading edge at the two ends, and the severe aerodynamic heat caused by stagnation of the airflow at the center point is relieved. The invention also discloses an inward-rotating air inlet channel, and the application of the V-shaped passivation front edge is beneficial to relieving aerodynamic heat.
Description
Technical Field
The invention relates to the technical field of mechanical industry, in particular to an inward turning type air inlet channel, and also relates to a V-shaped blunt front edge of the inward turning type air inlet channel.
Background
The hypersonic air inlet channel captures incoming flow and carries out speed reduction pressurization on the incoming flow, and the hypersonic air inlet channel is one of important pneumatic components of the scramjet engine. The three-dimensional inward-rotation type air inlet channel has the advantages of strong air flow capturing capability, high compression efficiency, convenience in integrated design and the like, and is widely focused at home and abroad.
The leading edge of the inner-rotation type air inlet channel is usually designed into a V-shaped structure, so that the starting capability of the air inlet channel under the condition of low Mach number incoming flow is improved, and the V-shaped leading edge is uniformly passivated in the prior art in consideration of pneumatic heat protection and structural safety performance. However, in the conventional V-shaped blunt leading edge, the root of the V-shape is an airflow stagnation point, which causes severe aerodynamic heat.
Therefore, how to alleviate the aerodynamic thermal environment at the root of the V-shape in the blunt leading edge of the V-shape is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a V-shaped blunt leading edge for an inner rotary air intake, which continuously reduces the radius of passivation from the center position to the leading edge at both ends in the conical curve section, relieving the severe aerodynamic heat caused by stagnation of the air flow at the center point. The invention also provides an inward-rotating air inlet channel, and the application of the V-shaped passivation front edge is beneficial to relieving aerodynamic heat.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A V-shaped blunt leading edge for an inner-turning inlet, comprising:
The conical curve section is provided with a plurality of concave curve sections,
The straight front edge sections are two and are respectively and smoothly tangent to the two ends of the conical curve section to form a V shape;
The passivation radius at the central position of the conical curve section is r1, the passivation radius at the position of the tangent point between the conical curve section and the straight front edge section is r2, wherein r1 is greater than r2, and the front edge passivation radius of the conical curve section continuously decreases from the central position to the tangent points at the two sides.
Preferably, in the V-shaped blunt leading edge, a center line of the conical curve section is a conical curve or a conical-like curve.
Preferably, in the V-shaped blunt leading edge, the blunt leading edge of the conical curve section is a blunt leading edge obtained by non-uniformly rounding and passivating the central line of the conical curve section.
Preferably, in the V-shaped blunt leading edge, the leading edge passivation radius r of the conical curve segment from the center position to the tangential point position on both sides varies along the center line according to the following formula:
r＝r2+(r1-r2)[sinφ]n
Wherein, Is the included angle between the tangential direction of the central line and the incoming flow direction; 0.5< n <10; θ is the half angle of the two straight leading edge segments.
Preferably, in the V-shaped blunt leading edge, the half opening angle satisfies: 12 ° < θ <65 °.
Preferably, in the V-shaped blunt leading edge, two of the straight leading edge segments are symmetrically arranged.
Preferably, in the V-shaped blunt leading edge, a center line of the straight leading edge section is a straight line section with two symmetrical sides; the blunt leading edge of the straight leading edge section is obtained by uniformly rounding and passivating the central line of the straight leading edge section serving as a contour, and the passivating radius is equal to r 2.
An internal rotation type air inlet channel is characterized by comprising a V-shaped blunt front edge, wherein the V-shaped blunt front edge is the V-shaped blunt front edge according to any one of the technical schemes.
The invention provides a V-shaped blunt leading edge of an inward turning type air inlet channel, which comprises a conical curve section and a straight leading edge section; the number of the straight front edge sections is two, and the straight front edge sections and the two straight front edge sections are respectively connected with the two ends of the conical curve section in a smooth tangent way to form a V shape; the passivation radius at the central position of the conical curve section is r1, the passivation radius at the position of the tangent point of the conical curve section and the straight front edge section is r2, wherein r1 is larger than r2, and the passivation radius of the front edge of the conical curve section continuously decreases from the central position to the tangent points at the two sides.
The invention provides a V-shaped blunt front edge, wherein the passivation radius of the front edge from the center position to two ends in a conical curve section is continuously reduced, and the severe aerodynamic heat caused by stagnation of airflow at the center point is relieved.
The invention also provides an inward-rotating air inlet channel, and the application of the V-shaped passivation front edge is beneficial to relieving aerodynamic heat.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an isometric view of a blunt leading edge in a chevron provided in an embodiment of the present invention;
FIG. 2 is a front view of a blunt leading edge in a chevron provided in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of A-A of FIG. 2;
FIG. 4 is a cross-sectional view of B-B in FIG. 2;
FIG. 5 is a left side view of a blunt leading edge of a chevron provided by an embodiment of the present invention;
FIG. 6 is a graph of numerical shading of the x-z symmetry plane of a uniformly passivated V-shaped blunt leading edge and a wall heat flow cloud provided by an embodiment of the present invention;
FIG. 7 is a graph of x-z symmetry plane numerical texture and wall heat flow cloud provided by an embodiment of the present invention;
FIG. 8 is a graph showing pressure distribution along the centerline of the wall of the conical curve segment for a V-shaped blunt leading edge and a uniformly passivated V-shaped blunt leading edge provided by an embodiment of the present invention;
FIG. 9 is a graph showing the heat flow distribution along the centerline of the wall of the conical curve segment for a V-shaped blunt leading edge and a uniformly passivated V-shaped blunt leading edge provided by an embodiment of the present invention;
wherein, in fig. 1-5:
Conical curve section 1; straight leading edge segment 2.
Detailed Description
The embodiment of the invention discloses a V-shaped blunt front edge of an inward turning type air inlet channel, which continuously reduces the passivation radius from the center position to the front edge at two ends in a conical curve section, and relieves the severe aerodynamic heat caused by stagnation of air flow at the center point. The embodiment of the invention also discloses an inner rotating type air inlet channel, and the application of the V-shaped passivation front edge is beneficial to relieving aerodynamic heat.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-9, an embodiment of the present invention provides a V-shaped blunt leading edge of an inner rotary air intake, which includes a conical curve section 1 and a straight leading edge section 2; the number of the straight front edge sections 2 is two, and the two straight front edge sections are respectively connected with the two ends of the conical curve section 1 in a smooth tangent way (namely, the connection part of the conical curve section 1 and the straight front edge section 2 is in smooth transition, and the extending direction of the straight front edge section 2 is tangent with the matched end part of the conical curve section 1) to form a V shape; the passivation radius at the center position of the conical curve section 1 (namely, at the root center point position of the V-shaped blunt leading edge) is r1, the passivation radius at the tangent point position of the conical curve section 1 and the straight leading edge section 2 is r2, wherein r1> r2, and the passivation radius of the leading edge of the conical curve section 1 continuously decreases from the center position to the tangent points at the two sides (namely, the connection position of the end part of the conical curve section 1 and the straight leading edge section 2).
The embodiment of the invention provides a V-shaped blunt front edge, wherein the passivation radius of the front edge from the center position to two ends in a conical curve section 1 is continuously reduced, and the severe aerodynamic heat caused by stagnation of air flow at the center point is relieved.
Specifically, in the V-shaped blunt leading edge, the center line of the conical curve section 1 is a conical curve or a conical-like curve. The blunt leading edge of the conical curve section 1 is obtained by taking the central line of the conical curve section 1 as a contour and carrying out non-uniform rounding passivation treatment.
The radius r of the passivation of the leading edge of the conic section 1 from the center position to the tangential point position on both sides varies along the center line according to the following formula:
r＝r2+(r1-r2)[sinφ]n
Wherein, The included angle between the tangential direction of the central line and the horizontal incoming flow direction is shown in figure 2; 0.5< n <10; θ is the half angle of the two straight leading edge segments 2.
In the V-shaped blunt leading edge provided in the above embodiment, the half angle θ of the two straight leading edge sections 2 satisfies: 12 ° < θ <65 °.
The two straight front edge sections 2 are symmetrically arranged, namely, the central lines of the two straight front edge sections 2 are straight line sections which are symmetrical to each other about the two sides of the x-y plane, as shown in figure 1; the blunt front edge of the straight front edge section 2 is obtained by uniformly rounding and passivating the central line of the straight front edge section 2 to be taken as a contour, and the passivating radius is equal to r 2.
The operation principle of the V-shaped blunt front edge provided by the embodiment of the invention is as follows:
1. the shock wave interference at the root part of the conical curve section 1 is complex, and the aerodynamic heat environment is severe. The central point of the root part of the V-shaped blunt front edge is reasonably provided with a larger passivation radius r1, so that the severe aerodynamic heat caused by stagnation of air flow at the central point can be relieved;
2. The aerodynamic thermal environment facing the sweepback straight front edge section 2 is relatively harsh, and smaller passivation radius r2 of the straight front edge section 2 can be adopted, so that the resistance is reduced, and the aerodynamic performance is improved.
3. The split shock wave generated by the straight front edge section 2 is intersected and interfered with the shock wave generated by the V-shaped root part, and the shock wave is transmitted into the incidence wall surface; from the tangential point position of the straight front edge section 2 and the conical curve section 1, the airflow direction near the wall surface of the conical curve section 1 is continuously deflected, and a series of compression waves are generated. According to the analysis of the shock wave interference theory, the shock wave incident on the wall surface is intersected with the compression wave on the same side, so that the shock wave intensity of the incident wall surface can be weakened, and the aerodynamic force/thermal load of the wall surface can be reduced. In addition, the straight front edge section 2 adopts a smaller passivation radius r2, the disjunct shock wave generated by the straight front edge section 2 is closer to the wall surface, the air flow leakage efficiency is increased, the accumulation of air flow along the straight front edge section 2 to the root of the V shape is reduced, the shock wave generated by the root of the V shape is closer to the wall surface, the crossing range of the shock wave incident to the wall surface and the same side of the compression wave is larger, the shock wave intensity incident to the wall surface is further weakened, and the aerodynamic force/thermal load of the wall surface is greatly reduced.
The blunt leading edge of V font that this embodiment provided possesses following beneficial effect:
1. Under the conditions that the passivation radius r1 of the central point of the V-shaped root and the incoming flow conditions are the same, compared with the traditional uniformly passivated V-shaped blunt front edge, the non-uniformly passivated V-shaped blunt front edge provided by the embodiment has obviously reduced wall pressure and heat flow peak values;
2. In the embodiment, a conical curve or a conical-like curve is adopted as the central line of the conical curve section 1, the shrinkage transition of the wall surface is smooth, so that the converging process of the airflow direction to the root of the V-shaped blunt front edge is as gentle as possible, and a more complex shock wave interference structure is avoided;
3. The embodiment only adjusts the passivation radius of the V-shaped blunt front edge, has simple structure, easy realization, low manufacturing cost and convenient use.
The following describes a chevron blunt leading edge in a specific embodiment:
the design parameters of the non-uniformly passivated V-shaped blunt leading edge in this embodiment are: the center line of the conical curve section is an arc with a curvature radius of 6.5mm, the passivation radius r1=2 mm at the center point of the V-shaped root, the passivation radius r2=1 mm at the tangent point position and the passivation radius from the center point of the V-shaped root to the tangent point position of the straight front edge section are gradually reduced, the half-opening angle θ of the front edge is=24°, the incoming flow Mach number is Ma=6, the static temperature is T=115K, and the static pressure is P=800 Pa.
As a comparison of this example, the conventional uniformly passivated V-shaped blunt leading edge design parameters were: the center line of the conical curve section is an arc with a curvature radius of 6.5mm, the passivation radius of the conical curve section and the straight front edge section is uniform, r1=r2=2mm, the half opening angle θ of the front edge is=24°, the incoming flow Mach number Ma is=6, the static temperature T is=115K, and the static pressure P is=800 Pa. Figure 6 shows a numerical schlieren of the x-z symmetry plane of a uniformly passivated V-shaped blunt leading edge root and a cloud of wall heat flow, wherein the wall heat flow is dimensionless by dividing the local heat flow by the theoretical heat flow value at the center of the V-shaped root. As can be seen from fig. 6, the heat flow at the center point of the V-shaped root is high; complex shock wave interference occurs on two sides of the conical curve section, transmission shock waves generated by the shock wave interference on two sides are incident on the wall surface, and heat flow of the wall surface near the shock wave incidence point is severely increased; the aerodynamic thermal environment facing the swept straight leading edge segment is relatively less severe; a series of compression waves are generated near the wall surface of the conical curve section from the tangential point position of the straight front edge section and the conical curve section.
Fig. 7 shows a numerical schlieren of the x-z symmetry plane of the non-uniformly passivated V-shaped blunt leading edge and a wall heat flow cloud, wherein the wall heat flow is dimensionless by dividing the local heat flow by the theoretical heat flow value at the center of the V-shaped root. As can be seen by comparing the accompanying drawings 6 and 7, under the condition that the central line of the V-shaped root, the passivation radius r1 at the central point of the V-shaped root and the incoming flow condition are the same, the airflow accumulation amount of the V-shaped root is reduced after the embodiment is adopted, and the disjunctor shock wave generated by the straight front edge section and the shock wave generated by the V-shaped root are closer to the wall surface; on both sides of the conical curve section, the shock wave transmitted by the shock wave interference is incident on the wall surface and is intersected with the compression wave near the wall surface of the conical curve section in the same side in a larger range.
Fig. 8 shows the pressure comparison on the wall surface center line of the uniformly passivated V-shaped blunt leading edge conical curve segment in this example, the horizontal axis is the circumferential angle along the circular arc center line, and the vertical axis is the local pressure divided by the theoretical value of the V-shaped root center point pressure. It can be seen from fig. 8 that the pressure maximum drops by about 47% with this embodiment compared to a uniformly passivated V-shaped blunt leading edge. By adopting the design of the invention, the shock wave intensity of the incident wall surface can be weakened, and the pressure load of the wall surface with the blunt front edge can be effectively reduced.
Fig. 9 shows the comparison of the heat flow on the wall surface center line of the uniformly passivated V-shaped blunt leading edge conical curve section in this example, the horizontal axis is the circumferential angle along the circular arc center line, and the vertical axis is the dimensionless heat flow obtained by dividing the local heat flow by the theoretical value of the heat flow at the center point of the V-shaped root. As can be seen from fig. 9, the heat flow value in the vicinity of the two side tangential point positions (66 °) slightly increases due to the reduced passivation radius of the straight leading edge of the present embodiment, compared to the uniformly passivated V-shaped blunt leading edge, but the aerodynamic thermal environment is relatively less severe. The maximum heat flow for this embodiment is reduced by about 43% compared to a uniformly passivated V-shaped blunt leading edge. By adopting the design of the invention, the heat flow load of the wall surface of the blunt front edge can be effectively reduced.
The embodiment of the invention provides an inward turning type air inlet channel, which comprises a V-shaped blunt front edge, wherein the V-shaped blunt front edge is the V-shaped blunt front edge provided by the embodiment.
The inner rotating type air inlet channel provided by the embodiment is beneficial to relieving aerodynamic heat by applying the V-shaped passivation front edge. Of course, the inner rotary air inlet provided in this embodiment also has other effects related to the V-shaped blunt front edge provided in the above embodiment, which are not described herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A V-shaped blunt leading edge for an internal transfer air inlet, comprising:
The conical curve section is provided with a plurality of concave curve sections,
The straight front edge sections are two and are respectively and smoothly tangent to the two ends of the conical curve section to form a V shape; the two straight front edge sections are symmetrically arranged;
The passivation radius at the central position of the conical curve section is r 1, the passivation radius at the tangential point position of the conical curve section and the straight front edge section is r 2, wherein r 1 > r2, the front edge passivation radius of the conical curve section continuously decreases from the central position to tangential points at two sides;
The blunt leading edge of the conical curve section is obtained by taking the central line of the conical curve section as a contour and carrying out non-uniform rounding passivation treatment;
the front edge passivation radius r of the conical curve section from the center position to the tangential point positions on the two sides is changed along the center line according to the following formula:
wherein phi is an included angle between the tangential direction of the central line and the incoming flow direction; 0.5 < n < 10; θ is the half angle of the two straight leading edge segments;
The central line of the straight front edge section is a straight line section with two symmetrical sides; the blunt leading edge of the straight leading edge section is obtained by uniformly rounding and passivating the central line of the straight leading edge section serving as a contour, and the passivating radius is equal to r 2.
2. The V-shaped blunt leading edge of claim 1 wherein the centerline of the conic curve segment is a conic curve.
3. The V-shaped blunt leading edge according to claim 1, wherein said half-angle satisfies: 12 ° < θ < 65 °.
4. An internal-rotation type air inlet channel, which comprises a V-shaped blunt front edge, wherein the V-shaped blunt front edge is the V-shaped blunt front edge as claimed in any one of claims 1 to 3.
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| CN201911330147.6A CN111173619B (en) | 2019-12-20 | 2019-12-20 | Inward-rotating air inlet channel and V-shaped blunt front edge thereof |
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| CN211343137U (en) * | 2019-12-20 | 2020-08-25 | 中国科学技术大学 | Inward-rotating air inlet channel and V-shaped blunt front edge thereof |
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| US5725180A (en) * | 1995-12-29 | 1998-03-10 | General Electric Company | Aircraft engine pitot plenum intake |
| US7007481B2 (en) * | 2003-09-10 | 2006-03-07 | General Electric Company | Thick coated combustor liner |
| CA2998361C (en) * | 2005-12-15 | 2020-04-28 | Gulfstream Aerospace Corporation | Isentropic compression inlet for supersonic aircraft |
| US20160229543A1 (en) * | 2015-02-06 | 2016-08-11 | United Technologies Corporation | Icephobic Flowpath for a Nose Cone and Method Therefor |
| CN107514311B (en) * | 2017-10-24 | 2019-04-30 | 西南科技大学 | Based on air intake duct/waverider forebody derived integrated design method rotatable in precursor shock wave |
| CN107766673B (en) * | 2017-11-10 | 2018-07-31 | 中国人民解放军国防科技大学 | Radius-controllable parameterized three-dimensional leading edge passivation design method |
| CN108331665B (en) * | 2018-03-29 | 2019-09-06 | 中国科学院力学研究所 | Rotatable air intake duct Fast design method in the hypersonic variable cross-section of full flow capture |
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