CN116306014A - Design method of three-dimensional variable-section unilateral expansion spray pipe with large lateral expansion angle - Google Patents

Design method of three-dimensional variable-section unilateral expansion spray pipe with large lateral expansion angle Download PDF

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CN116306014A
CN116306014A CN202310373372.8A CN202310373372A CN116306014A CN 116306014 A CN116306014 A CN 116306014A CN 202310373372 A CN202310373372 A CN 202310373372A CN 116306014 A CN116306014 A CN 116306014A
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spray pipe
nozzle
wall surface
inlet
lower wall
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潘鑫峰
周吉利
牛春岩
张少丽
金文栋
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AECC Shenyang Engine Research Institute
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Abstract

The application belongs to the technical field of aeroengine spray pipes, and particularly relates to a design method of a three-dimensional variable cross-section unilateral expansion spray pipe with a large lateral expansion angle. Comprising the following steps: step one, acquiring pneumatic parameters and size constraint parameters of a spray pipe; step two, defining the side wall of the spray pipe as a straight line configuration, and calculating a lateral expansion angle; step three, defining the lower wall surface of the spray pipe as a linear configuration, and calculating the expansion angle of the lower wall surface; step four, obtaining the upper wall surface configuration of the spray pipe according to the shortest length spray pipe theory and a unilateral expansion spray pipe design method considering lateral expansion; step five, directly shortening the upper wall surface of the spray pipe and the lower wall surface of the spray pipe according to the length of the upper wall surface of the spray pipe to obtain a reference spray pipe configuration, judging whether the height of the upper wall surface of the spray pipe in the reference spray pipe configuration meets the size constraint requirement, if so, outputting the reference spray pipe configuration, and entering step six; if not, adjusting the pneumatic parameters of the spray pipe, and returning to the step four; and step six, designing a three-dimensional variable cross-section spray pipe.

Description

Design method of three-dimensional variable-section unilateral expansion spray pipe with large lateral expansion angle
Technical Field
The application belongs to the technical field of aeroengine spray pipes, and particularly relates to a design method of a three-dimensional variable cross-section unilateral expansion spray pipe with a large lateral expansion angle.
Background
In recent years, hypersonic technology continuously promotes the appearance of hypersonic cruise missiles, hypersonic aircrafts, aeroplanes and other novel hypersonic aircrafts, and has great strategic significance in military and economy. The scramjet engine has larger specific impulse under the large Mach number, has simple structure and does not need to carry an oxidant, thereby becoming the optimal choice of the power of the hypersonic aircraft. The nozzle is an important component of ramjet engine that generates thrust. At a flight Mach number of 6, the thrust generated by the nozzle may be 70% of the total ramjet thrust, and a 1% drop in nozzle thrust would result in a 4% drop in the net engine mounted thrust. Because the hypersonic speed flies, the pressure drop of the scramjet is relatively large, and the outlet area of the jet pipe under the ideal expansion condition is very large, the weight and the height of the engine are overlarge, and therefore the jet pipe of the scramjet often adopts a single-side expansion jet pipe mode. The unilateral expansion spray pipe takes the lower surface of the rear body of the airplane as the upper expansion surface of the spray pipe, truncates the lower expansion surface of the spray pipe, and the air flow freely expands at the lower side, so that the unilateral expansion spray pipe is formed. The unilateral expansion spray pipe has the advantages of simple structure, easiness in integrated design with an airplane, wide working range, capability of generating lifting force and the like.
With the development of hypersonic technology, a three-dimensional runner propulsion system adopting a round or oval scramjet combustion chamber is more and more emphasized, and compared with a traditional two-dimensional runner, the round three-dimensional runner has small wet area, so that the viscosity loss can be reduced, and in addition, the integration with a machine body is easy to realize. Meanwhile, the nozzle is strictly constrained by the geometric shape and the size of the aircraft body in the design process, in order to integrate the engine and the aircraft body, the shape of the outlet of the nozzle is not a simple circle or rectangle any more, and the nozzle is not a simple binary or axisymmetric structure but a more complex space curved surface. Therefore, as a thrust jet pipe, the jet pipe not only realizes the variable cross-section design from an inlet to a complex outlet under the condition of meeting the geometric constraint of an aircraft body, but also needs to provide excellent aerodynamic performance, and has great design difficulty.
The traditional three-dimensional variable-section spray pipe is generally designed by adopting a bidirectional streamline tracking method: firstly, an annular reference flow field is designed by a characteristic line method, and then a three-dimensional variable cross-section spray pipe with an inlet and outlet shape meeting the requirement is designed by a bidirectional streamline tracking technology. When the diameter of the inlet and the height of the outlet of the spray pipe are given, the area ratio of the outlet of the spray pipe to the inlet is an important index for measuring the lateral expansion capacity of the spray pipe, and the larger the area ratio is, the stronger the lateral expansion capacity is. In nozzle designs, it is often desirable to achieve maximum expansion of the gas over a limited length. Therefore, the nozzle is required to expand not only in the up-down direction but also in the left-right direction. In addition, in the process of integrating the flying hair, the aircraft also requires that the maximum width of the spray pipe is large enough to realize the integrated design with the rear fuselage. The nozzle sidewall also has a large lateral expansion angle.
The critical dimensions of the annular reference nozzle are shown in figure 1. When the length of the spray pipe, the inlet height, the outlet height and the expansion angle of the lower wall surface are fixed values, the area ratio of the outlet to the inlet of the spray pipe is a single-value function of r 1. At this time, the area ratio of the nozzle changes along with the change of r1, as shown in fig. 2, a maximum value exists in the area ratio of the outlet to the inlet of the annular reference nozzle, and the maximum value is often smaller, so that the lateral expansion degree of a streamline in the annular reference flow field is weaker, and the three-dimensional variable cross-section nozzle design with the requirement of a large lateral expansion angle cannot be realized.
It is therefore desirable to have a solution that overcomes or at least alleviates at least one of the above-mentioned drawbacks of the prior art.
Disclosure of Invention
The purpose of the application is to provide a design method of a three-dimensional variable-section unilateral expansion spray pipe with a large lateral expansion angle, so as to solve at least one problem existing in the prior art.
The technical scheme of the application is as follows:
a design method of a three-dimensional variable cross-section unilateral expansion spray pipe with a large lateral expansion angle comprises the following steps:
step one, acquiring jet pipe pneumatic parameters and size constraint parameters, wherein the size constraint parameters comprise jet pipe upper wall length, jet pipe upper wall height, jet pipe lower wall length, jet pipe lower wall height, jet pipe inlet width and jet pipe outlet width;
step two, defining the side wall of the spray pipe as a straight line configuration, and calculating a lateral expansion angle according to the length of the upper wall surface of the spray pipe, the width of the inlet of the spray pipe and the width of the outlet of the spray pipe;
step three, defining the lower wall surface of the spray pipe as a straight line configuration, and calculating the expansion angle of the lower wall surface according to the length of the lower wall surface of the spray pipe, the height of the lower wall surface of the spray pipe and the width of the inlet of the spray pipe;
step four, taking the pneumatic parameters of the spray pipe, the lateral expansion angle and the expansion angle of the lower wall surface as input, and obtaining the configuration of the upper wall surface of the spray pipe according to the shortest length spray pipe theory and a unilateral expansion spray pipe design method considering lateral expansion;
step five, directly shortening the upper wall surface of the spray pipe and the lower wall surface of the spray pipe according to the length of the upper wall surface of the spray pipe to obtain a reference spray pipe configuration with a large lateral expansion angle characteristic, judging whether the height of the upper wall surface of the spray pipe of the reference spray pipe configuration meets the size constraint requirement, if so, outputting the reference spray pipe configuration, and entering a step six; if not, adjusting the pneumatic parameters of the spray pipe, and returning to the step four;
and step six, carrying out three-dimensional numerical simulation calculation on the reference nozzle configuration to obtain a three-dimensional reference flow field, thereby obtaining a nozzle inlet streamline with a specific nozzle inlet shape and a nozzle outlet streamline with a specific nozzle outlet shape, merging the nozzle inlet streamline and the nozzle outlet streamline through a linear gradual change function, and obtaining the three-dimensional variable cross-section unilateral expansion nozzle under a large lateral expansion angle, wherein the inlet and outlet shapes of the three-dimensional variable cross-section unilateral expansion nozzle meet the requirements.
In at least one embodiment of the present application, in the second step, the calculating the lateral expansion angle according to the length of the upper wall surface of the nozzle, the width of the inlet of the nozzle, and the width of the outlet of the nozzle includes:
angle of lateral expansion theta c The method comprises the following steps:
Figure BDA0004169424400000031
wherein L is 1 The length of the upper wall surface of the spray pipe is D, the width of the inlet of the spray pipe is D, and the width of the outlet of the spray pipe is W.
In at least one embodiment of the present application, in the third step, the calculating the lower wall expansion angle according to the nozzle lower wall length, the nozzle lower wall height, and the nozzle inlet width includes:
lower wall expansion angle delta L The method comprises the following steps:
Figure BDA0004169424400000032
wherein L is 2 For the length of the lower wall surface of the spray pipe, H 2 The height of the lower wall surface of the spray pipe is D, and the width of the inlet of the spray pipe is D.
In at least one embodiment of the present application, the nozzle aerodynamic parameters include inlet mach number, outlet mach number, geometry control parameters, and nozzle inlet air flow direction angle.
In at least one embodiment of the present application, in step five, the inlet mach number and the outlet mach number are adjusted when the nozzle upper wall height of the reference nozzle configuration does not meet the size constraint requirements.
In at least one embodiment of the present application, in step six, the three-dimensional variable cross-section single-side expansion nozzle under a large lateral expansion angle, in which the shapes of the inlet and the outlet meet the requirements, is obtained through a bidirectional streamline tracking method.
The invention has at least the following beneficial technical effects:
according to the design method of the three-dimensional variable-section single-side expansion spray pipe with the large lateral expansion angle, the three-dimensional variable-section single-side expansion spray pipe with the large lateral expansion angle can be designed according to the given requirements of the pneumatic parameters of the inlet of the spray pipe, the design Mach number, the shape of the inlet and the outlet of the spray pipe and the external dimension of the spray pipe, so that the expansion ratio and the thrust coefficient of the spray pipe can be greatly improved within a limited length and height range; meanwhile, the overall dimension of the spray pipe completely meets the requirements of an airplane, and the design efficiency and quality of the integrated design of the flying of the hypersonic aircraft are greatly improved.
Drawings
FIG. 1 is a schematic illustration of an annular datum nozzle of one embodiment;
FIG. 2 is a schematic diagram of annular reference nozzle area ratios of one embodiment;
FIG. 3 is a top view of a spout according to one embodiment of the present application;
FIG. 4 is a cross-sectional view of a nozzle according to one embodiment of the present application;
FIG. 5 is a schematic illustration of nozzle geometry according to one embodiment of the present application;
FIG. 6 is a schematic view of a nozzle flow field signature of an embodiment of the present application;
FIG. 7 is a schematic illustration of a baseline nozzle configuration according to one embodiment of the present application;
FIG. 8 is a schematic view of a nozzle inlet flow line of one embodiment of the present application;
FIG. 9 is a schematic view of a nozzle outlet flow line of an embodiment of the present application.
Detailed Description
In order to make the purposes, technical solutions and advantages of the implementation of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Embodiments of the present application are described in detail below with reference to the accompanying drawings.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present application.
The present application is described in further detail below in conjunction with fig. 3-9.
The application provides a design method of a three-dimensional variable cross-section unilateral expansion spray pipe with a large lateral expansion angle, which comprises the following steps:
step one, acquiring jet pipe pneumatic parameters and size constraint parameters, wherein the size constraint parameters comprise jet pipe upper wall length, jet pipe upper wall height, jet pipe lower wall length, jet pipe lower wall height, jet pipe inlet width and jet pipe outlet width;
step two, defining the side wall of the spray pipe as a straight line configuration, and calculating a lateral expansion angle according to the length of the upper wall surface of the spray pipe, the width of the inlet of the spray pipe and the width of the outlet of the spray pipe;
step three, defining the lower wall surface of the spray pipe as a straight line configuration, and calculating the expansion angle of the lower wall surface according to the length of the lower wall surface of the spray pipe, the height of the lower wall surface of the spray pipe and the width of the inlet of the spray pipe;
step four, taking the pneumatic parameters, the lateral expansion angle and the lower wall expansion angle of the spray pipe as input, and obtaining the upper wall configuration of the spray pipe according to the shortest length spray pipe theory and a unilateral expansion spray pipe design method considering lateral expansion;
step five, directly shortening the upper wall surface of the spray pipe and the lower wall surface of the spray pipe according to the length of the upper wall surface of the spray pipe to obtain a reference spray pipe configuration with a large lateral expansion angle characteristic, judging whether the height of the upper wall surface of the spray pipe of the reference spray pipe configuration meets the size constraint requirement, if so, outputting the reference spray pipe configuration, and entering a step six; if not, adjusting the pneumatic parameters of the spray pipe, and returning to the step four;
step six, carrying out three-dimensional numerical simulation calculation on the reference nozzle configuration to obtain a three-dimensional reference flow field, thereby obtaining a nozzle inlet streamline with a specific nozzle inlet shape and a nozzle outlet streamline with a specific nozzle outlet shape, merging the nozzle inlet streamline and the nozzle outlet streamline through a linear gradual change function, and obtaining the three-dimensional variable cross-section unilateral expansion nozzle under a large lateral expansion angle, wherein the inlet and outlet shapes of the three-dimensional variable cross-section unilateral expansion nozzle meet the requirements.
According to the design method of the three-dimensional variable-section single-side expansion spray pipe with the large lateral expansion angle, in order to obtain the three-dimensional variable-section single-side expansion spray pipe with the large lateral expansion angle, a three-dimensional reference spray pipe with the large lateral expansion angle is required to be designed. The three-dimensional reference spray pipe with any lateral expansion angle and controllable inlet and outlet size can be obtained by adopting the shortest length spray pipe theory and a spray pipe design method considering lateral expansion.
In a preferred embodiment of the present application, the nozzle design parameters, including nozzle aerodynamic parameters and strong dimensional constraints, are first obtained, and the dimensional requirements, including nozzle upper wall length L1, nozzle upper wall height H1, nozzle lower wall length L2, nozzle lower wall height H2, nozzle inlet width D, and nozzle outlet width W, are determined prior to nozzle design.
When the line of the nozzle sidewall is straight, the nozzle has better performance, thus defining the nozzle sidewall as a straight line configuration, as shown in FIG. 3, the lateral expansion angle θ can be determined according to the required nozzle upper wall length L1, nozzle inlet width D and nozzle outlet width W c The method comprises the following steps:
Figure BDA0004169424400000061
wherein L is 1 The length of the upper wall surface of the spray pipe is D, the width of the inlet of the spray pipe is D, and the width of the outlet of the spray pipe is W.
Because the length L2 of the lower wall surface of the spray pipe required in the actual design process is generally shorter, the cutting line of the lower wall surface of the spray pipe is basically a straight line, and the lower wall surface of the spray pipe is defined asThe linear configuration is used for calculating the expansion angle delta of the lower wall surface according to the length L2 of the lower wall surface of the spray pipe, the height H2 of the lower wall surface of the spray pipe and the width D of the inlet of the spray pipe L The method comprises the following steps:
Figure BDA0004169424400000062
wherein L is 2 For the length of the lower wall surface of the spray pipe, H 2 The height of the lower wall surface of the spray pipe is D, and the width of the inlet of the spray pipe is D.
After the parameters are obtained, the pneumatic parameters of the spray pipe, the lateral expansion angle and the expansion angle of the lower wall surface are used as input, and the upper wall surface configuration of the spray pipe is obtained according to the shortest length spray pipe theory and the design method of the single-side expansion spray pipe considering the lateral expansion. In particular, in the shortest length nozzle theory MLN, the shortest length nozzle is an acute angle (sharp angle) that compresses all the initial expansion sections into the throat, so that the shortest length nozzle, also called an acute angle nozzle, is obtained. The initial expansion section is compressed to be a sharp point of the throat part in the shortest length jet pipe design theory, so that the length of the initial expansion section is greatly shortened, the length of the obtained jet pipe is shortened by about 50% compared with the jet pipe obtained by using the basic characteristic line theory, and the obtained jet pipe still has higher flow field quality.
The general single-sided expansion nozzle profile is shown in fig. 5. Firstly, determining an initial expansion angle delta of the upper wall surface of the spray pipe and the initial expansion angle delta of the lower wall surface of the spray pipe according to an inlet Mach number, an outlet Mach number, a geometric control parameter G and a direction angle alpha of the inlet airflow of the spray pipe L Can be directly assigned as shown in the following formula:
Figure BDA0004169424400000063
wherein delta U An initial expansion angle is set for the upper wall surface of the spray pipe; v (V) E For the corresponding Prussian-Meier expansion angle of the gas stream from the nozzle inlet to the designed outlet Mach number, the nozzle inlet gas stream direction angle alpha is limited to 0 to V E Between them.
Further, the flow field and the spray pipe molded surface are solved by a characteristic line method, and the method mainly comprises the following steps:
a. as shown in fig. 6, according to a plurality of characteristic lines sent by the starting upper and lower points of the nozzle, the flow parameters of the core area intersected by the characteristic lines are obtained by solving a two-dimensional characteristic line equation and a compatibility equation:
Figure BDA0004169424400000064
Figure BDA0004169424400000071
wherein θ is the angle between the local velocity and the x-axis, μ is the local Mach angle, V x For the component of the local velocity on the x-axis, c is the local velocity of sound, λ is the slope of the characteristic line, V y For the component of the local velocity on the y-axis, + represents the left-row feature line, -represents the right-row feature line.
b. The characteristic line sent by the upper sharp point crosses the straight line segment de of the lower wall surface and reflects after passing through the core area, the reflected characteristic line crosses the characteristic line sent by the upper sharp point, and the expansion and acceleration of the air flow are carried out again until the Mach number at the point g is equal to the designed Mach number;
c. under the two-dimensional condition, the acg area and the egf area are simple wave areas, and the coordinates of the upper wall surface and the lower wall surface can be obtained according to a wave-absorbing method or a flow conservation method, so that the configuration of the upper wall surface and the lower wall surface of the spray pipe is obtained.
In order to increase the expansion area of the spray pipe and better realize the integrated design with the airplane, the spray pipe also needs to be expanded to a certain extent in the lateral direction. The design method of the unilateral expansion spray pipe considering the lateral expansion comprises the following steps: the original two-dimensional characteristic line equation is changed into a quasi two-dimensional characteristic line equation considering lateral expansion, and the modified design method can obtain the configuration of the upper wall surface and the lower wall surface of the spray pipe according to the given side wall molded line design.
Specifically, to consider the effect of lateral expansion on the nozzle profile when designing the nozzle upper and lower profiles, a quasi-two-dimensional feature line-based theory approach is employed. Compared with the two-dimensional characteristic line method, the compatibility equation is transformed into the following form:
Figure BDA0004169424400000072
wherein V is x For the component of the local velocity on the x-axis, c is the local velocity of sound, λ is the slope of the characteristic line, V y For the component of the local velocity on the y-axis, + represents the left-row feature line, -represents the right-row feature line.
The function δ of controlling lateral expansion is:
Figure BDA0004169424400000073
the nozzle lateral expansion line is a single-valued function of x, denoted W (x).
According to the quasi-two-dimensional characteristic line theory method, flow field parameters of the internal points of the spray pipe can be obtained through solving, and then the wall coordinates of the spray pipe can be obtained through solving according to flow conservation.
According to the design method of the three-dimensional variable-section unilateral expansion spray pipe with the large lateral expansion angle, after the spray pipe side wall configuration, the spray pipe lower wall configuration and the spray pipe upper wall configuration are determined, the spray pipe upper wall and the spray pipe lower wall are directly truncated according to the spray pipe upper wall length to obtain a reference spray pipe configuration, the spray pipe lower wall height H2 of the reference spray pipe configuration necessarily meets the design requirement due to the limitation in the second step and the third step, the spray pipe inlet width D and the spray pipe outlet width W necessarily meet the design requirement, whether the spray pipe upper wall height meets the design requirement or not is judged, if yes, the design is terminated, and the reference spray pipe configuration is output; if the design Mach number in the pneumatic parameters of the spray pipe is not met, the method returns to the fourth step, and the upper wall surface configuration of the spray pipe is obtained again until the length and the height of the upper wall surface of the spray pipe meet the design requirements at the same time. In one embodiment of the present application, a final baseline nozzle configuration is obtained as shown in FIG. 7.
In the embodiment, a reference flow field with rectangular nozzle inlets and outlets and is designed to meet the requirement of lateral expansion degree. The reference nozzle configuration just encloses the desired nozzle inlet and outlet.
And finally, designing a three-dimensional variable cross-section spray pipe, carrying out simulation calculation on the reference spray pipe configuration by adopting an ideal non-stick gas model, respectively making a group of flow lines through a given inlet and an outlet, combining the two groups of flow lines through a linear gradual change function, and obtaining the three-dimensional variable cross-section unilateral expansion spray pipe under a large lateral expansion angle, wherein the shape of the inlet and the outlet of the three-dimensional variable cross-section unilateral expansion spray pipe meets the requirement, as shown in figures 8-9.
The coordinates of the inlet and outlet streamline are shown in the following formula:
(y,z)in＝fin(x)
(y,z)out＝fout(x)
the combined flow lines:
(y,z)＝(x/L1)(y,z)in+(1-x/L1)(y,z)out
wherein (y, z) in is a streamline passing through the nozzle inlet profile, (y, z) out is a streamline passing through the nozzle outlet profile, and (y, z) is a merged nozzle profile busbar, all three of which are single-valued functions of x.
According to the design method of the three-dimensional variable cross-section unilateral expansion spray pipe with the large lateral expansion angle, the three-dimensional variable cross-section unilateral expansion spray pipe design in the large lateral expansion degree can be realized, the expansion degree of gas is improved in a limited length, the thrust coefficient of the spray pipe is improved, the requirements of an airplane on the size of the spray pipe are met, and the integrated design of the spray pipe and the airplane is realized.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (6)

1. The design method of the three-dimensional variable cross-section unilateral expansion spray pipe with a large lateral expansion angle is characterized by comprising the following steps of:
step one, acquiring jet pipe pneumatic parameters and size constraint parameters, wherein the size constraint parameters comprise jet pipe upper wall length, jet pipe upper wall height, jet pipe lower wall length, jet pipe lower wall height, jet pipe inlet width and jet pipe outlet width;
step two, defining the side wall of the spray pipe as a straight line configuration, and calculating a lateral expansion angle according to the length of the upper wall surface of the spray pipe, the width of the inlet of the spray pipe and the width of the outlet of the spray pipe;
step three, defining the lower wall surface of the spray pipe as a straight line configuration, and calculating the expansion angle of the lower wall surface according to the length of the lower wall surface of the spray pipe, the height of the lower wall surface of the spray pipe and the width of the inlet of the spray pipe;
step four, taking the pneumatic parameters of the spray pipe, the lateral expansion angle and the expansion angle of the lower wall surface as input, and obtaining the configuration of the upper wall surface of the spray pipe according to the shortest length spray pipe theory and a unilateral expansion spray pipe design method considering lateral expansion;
step five, directly shortening the upper wall surface of the spray pipe and the lower wall surface of the spray pipe according to the length of the upper wall surface of the spray pipe to obtain a reference spray pipe configuration with a large lateral expansion angle characteristic, judging whether the height of the upper wall surface of the spray pipe of the reference spray pipe configuration meets the size constraint requirement, if so, outputting the reference spray pipe configuration, and entering a step six; if not, adjusting the pneumatic parameters of the spray pipe, and returning to the step four;
and step six, carrying out three-dimensional numerical simulation calculation on the reference nozzle configuration to obtain a three-dimensional reference flow field, thereby obtaining a nozzle inlet streamline with a specific nozzle inlet shape and a nozzle outlet streamline with a specific nozzle outlet shape, merging the nozzle inlet streamline and the nozzle outlet streamline through a linear gradual change function, and obtaining the three-dimensional variable cross-section unilateral expansion nozzle under a large lateral expansion angle, wherein the inlet and outlet shapes of the three-dimensional variable cross-section unilateral expansion nozzle meet the requirements.
2. The method for designing a three-dimensional variable cross-section single-side expansion nozzle with a large lateral expansion angle according to claim 1, wherein in the second step, calculating the lateral expansion angle according to the length of the upper wall surface of the nozzle, the width of the inlet of the nozzle, and the width of the outlet of the nozzle comprises:
lateral directionExpansion angle theta c The method comprises the following steps:
Figure FDA0004169424390000011
wherein L is 1 The length of the upper wall surface of the spray pipe is D, the width of the inlet of the spray pipe is D, and the width of the outlet of the spray pipe is W.
3. The method for designing a three-dimensional variable cross-section single-side expansion nozzle with a large lateral expansion angle according to claim 1, wherein in the third step, calculating the lower wall expansion angle according to the nozzle lower wall length, the nozzle lower wall height and the nozzle inlet width comprises:
lower wall expansion angle delta L The method comprises the following steps:
Figure FDA0004169424390000021
wherein L is 2 For the length of the lower wall surface of the spray pipe, H 2 The height of the lower wall surface of the spray pipe is D, and the width of the inlet of the spray pipe is D.
4. The method for designing a three-dimensional variable cross-section single-sided expansion nozzle with large lateral expansion angle according to claim 1, wherein the nozzle aerodynamic parameters include inlet mach number, outlet mach number, geometry control parameters and nozzle inlet air flow direction angle.
5. The method for designing a three-dimensional variable cross-section single-side expansion nozzle with a large lateral expansion angle according to claim 1, wherein in the fifth step, when the height of the upper wall surface of the nozzle in the reference nozzle configuration does not meet the size constraint requirement, the inlet mach number and the outlet mach number are adjusted.
6. The method for designing the three-dimensional variable-section single-side expansion nozzle with the large lateral expansion angle according to claim 1, wherein in the step six, the three-dimensional variable-section single-side expansion nozzle with the large lateral expansion angle, the inlet and outlet shapes of which meet the requirements, is obtained through a bidirectional streamline tracking method.
CN202310373372.8A 2023-04-10 2023-04-10 Design method of three-dimensional variable-section unilateral expansion spray pipe with large lateral expansion angle Pending CN116306014A (en)

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