A design method of a non-rotating integral inertial particle separator

Abstract

The application discloses a non-rotation type integral inertial particle separator design method, which comprises the following steps: S1, establishing an XY coordinate system and determining a plurality of key nodes on a meridian plane flow passage profile and coordinates of the key nodes; S2, setting a slope value for each key node; S3, calculating a two-degree-of-freedom adjustable curve between two key nodes which need to be connected into a line; S4, calculating the two-degree-of-freedom adjustable curve between all the key nodes which need to be connected, and sequentially connecting to form a meridian plane flow passage profile of the non-rotation type integral inertial particle separator; and S5, rotating the meridian plane flow passage profile by 360 degrees around the x-axis of the coordinate system to generate a solid of revolution, and obtaining a three-dimensional geometric configuration of the non-rotation type integral inertial particle separator. i,1 i,2 The application adopts a two-degree-of-freedom adjustable curve function, and the shape of the curve between any adjacent key nodes can be freely changed by changing free parameters O i,1 i,2 , O i,2 , so that the design and research of the parameterization of the non-rotation type integral inertial particle separator are more flexible and rapid.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular to a design method for a non-rotating integral inertial particle separator. Background Technology

[0002] Aero engines are crucial components of aircraft, often referred to as their heart. Turboshaft engines are a typical type of aero engine, primarily used in rotorcraft such as helicopters and tiltrotor aircraft. Compared to fixed-wing aircraft, rotorcraft offer advantages such as easier takeoff and landing and hovering capabilities, allowing them to operate in environments lacking runways, such as deserts, wilderness, and forests. However, this also means that turboshaft engines used in rotorcraft face a greater risk of ingesting sand and dust particles. If a large amount of sand and dust particles enters the engine core, the engine's lifespan will be significantly shortened, or even directly damaged. To mitigate the negative impact of sand and dust particles on the engine, advanced turboshaft engines typically incorporate particle separators upstream of the core, thereby expelling sand and dust particles from the mains and reducing their damage.

[0003] Commonly used particle separators are mainly divided into three categories: inlet barrier filters, vortex separators, and non-vortex integral inertial particle separators. Inlet barrier filters use filter media to adsorb solid particles, but they need to be replaced frequently and have a short service life. Vortex separators use blades in the flow channel to generate vortices, which roll sand and dust particles to the outside of the flow channel. Vortex separators require a large windward area and installation volume, resulting in poor structural economy and a large total pressure loss. Non-vortex integral inertial particle separators do not require additional blades and have the advantages of light weight, low aerodynamic loss, and high reliability. They rely on their own curved and bifurcated flow channel to induce sand and dust particles with greater inertia into the sand discharge channel, thereby achieving the purpose of foreign matter removal.

[0004] Now combined with the appendix Figure 1 A brief explanation of the working principle of the irrotational integral inertial particle separator: The flow channel profile of the irrotational integral inertial particle separator is a bifurcated curved flow channel. When air and sand particles flow through the sharply curved flow channel, the air has low inertia and can flow into the main channel in large quantities along the pipe profile, while the sand particles have high inertia and are difficult to enter the main channel with the air. Therefore, they are separated from the airflow, enter the scavenging channel, and are collected by the scavenging volute downstream of the scavenging channel and discharged from the engine.

[0005] Although the irrotational integral inertial particle separator is mainly an axisymmetric body of revolution in three-dimensional geometry, that is, after designing the flow channel profile of the two-dimensional meridional plane, the three-dimensional configuration of the irrotational integral inertial particle separator can be obtained by rotating it 360° around the x-axis, the high-performance design of the two-dimensional meridional plane itself is still quite challenging due to the complexity of the flow channel shape.

[0006] Existing design methods either heavily rely on commercial modeling software or employ excessive design parameters to describe the flow channel profile on the meridional plane, making rapid and flexible parametric design difficult. Furthermore, in specific engineering projects, the design of the particle separator flow channel profile must be compatible with the engine structure; therefore, it is sometimes required that the particle separator flow channel profile pass through specific points, or that the position of a certain local part of the flow channel cannot be changed. Existing design methods struggle to meet these design constraints.

[0007] Therefore, a new parametric design method is needed, which can not only conveniently determine the flow channel profile on the meridional plane based on geometric parameters with clear physical meaning, but also quickly change the design parameters to realize the updating and adjustment of the flow channel profile. Summary of the Invention

[0008] Purpose of the invention: To address the above-mentioned shortcomings, this invention provides a design method for a non-rotating integral inertial particle separator.

[0009] Technical Solution: To solve the above problems, this invention adopts a design method for a non-rotational integral inertial particle separator, including the following steps:

[0010] S1. Establish an XY coordinate system and determine several key nodes on the meridional flow channel surface. The coordinates of the key nodes are (x1, f1), (x2, f2)...(x...). i ,f i ), (x i+1 ,f i+1 );

[0011] S2. Set slope values ​​f'1, f'2…f' for each key node. i f' i+1 ;

[0012] S3. Calculate and generate a two-degree-of-freedom adjustable curve between the two key nodes that need to be connected into a line. The function of the two-degree-of-freedom adjustable curve is as follows:

[0013] y=α0(t)f i +α1(t)f i+1 +β0(t)h i f' i +β1(t)h i f' i+1

[0014] in:

[0015]

[0016] h i =x i+1 -x

[0017] t=(xxi ) / h i

[0018] O i,1 O i,2 α0(t), α1(t), β0(t), and β1(t) are freely adjustable coefficients;

[0019] S4. Calculate the two-degree-of-freedom adjustable curves between all the key nodes that need to be connected, and connect all the obtained two-degree-of-freedom adjustable curves in sequence to form the meridional flow channel profile of the non-rotational integral inertial particle separator.

[0020] S5. Rotate the meridional flow channel surface 360° around the x-axis in the coordinate system to generate a rotating body, thereby obtaining the three-dimensional geometric configuration of the non-rotational integral inertial particle separator.

[0021] Furthermore, the meridional flow channel profile includes a mixed flow channel profile, a sweeping flow channel profile formed by the bifurcation of the mixed flow channel profile, and a main flow channel profile. The flow channel formed by the sweeping flow channel profile is used to separate sand and dust particles, and the flow channel formed by the main flow channel profile is used to allow airflow to pass through.

[0022] Furthermore, the distance between the two most distant key nodes in the x-axis direction is equal to the intake duct length.

[0023] Furthermore, the ordinate value of the key node at the upper end face of the throat of the mixing channel profile ranges from 1.1 to 1.8R. 扫气流道 R 扫气流道 The coordinates are the ordinates of the key nodes on the upper surface of the swept airflow channel profile.

[0024] Furthermore, the number of key nodes is 15-20.

[0025] Furthermore, the slope value is an arbitrary constant.

[0026] Furthermore, the O i,1 O i,2 It is an arbitrary constant.

[0027] The present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described method.

[0028] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the above-described method.

[0029] Beneficial effects: Compared with the prior art, the significant advantage of this invention is that it uses a two-degree-of-freedom adjustable curve function, which allows for the adjustment of the free parameter O.i,1 O i,2 This allows the shape of the curve between any adjacent key nodes to change even when the key nodes and their slopes are determined, enabling more flexible and rapid parameterization design research for irrotational integral inertial particle separators. Attached Figure Description

[0030] Figure 1 The working principle of the non-rotational integral inertial particle separator;

[0031] Figure 2 This is a schematic diagram of the key nodes of the irrotation-free integral inertial particle separator in this embodiment;

[0032] Figure 3 This is a schematic diagram of the meridional flow channel profile in this embodiment;

[0033] Figure 4 A schematic diagram of the three-dimensional geometric configuration of a non-rotational integral inertial particle separator;

[0034] Figure 5 The diagram shows the sand separation efficiency of the non-rotating integral inertial particle separator in this embodiment. Detailed Implementation

[0035] The design method of a non-rotational integral inertial particle separator in this embodiment includes the following steps:

[0036] S1. Establish an XY coordinate system and determine several key nodes on the meridional flow channel profile. In this embodiment, the meridional flow channel profile includes a mixing flow channel profile, a sweeping flow channel profile formed by the bifurcation of the mixing flow channel profile, and a main flow channel profile. The flow channel formed by the sweeping flow channel profile is used to separate sand and dust particles, and the flow channel formed by the main flow channel profile is used for airflow. The number of key nodes on the meridional flow channel profile is 15-20.

[0037] The first group of key nodes (AF) consists of six key nodes, the second group (NR) consists of five key nodes, and the third group (GM) consists of seven key nodes. For example... Figure 2 As shown, the first set of key nodes AF represents the design point of the outer surface profile of the central body of the meridional flow channel profile. The second set of key nodes NR represents the design point of the outer surface profile of the meridional flow channel profile, and the third set of key nodes GM represents the design point of the bifurcation flow channel profile of the meridional flow channel profile.

[0038] The coordinates of several key nodes can be determined based on engine structure and design experience. For example, the distance between the two most distant key nodes (A and F) in the x-axis direction is equal to the intake duct length; the ordinate of the key node O at the upper end face of the mixing channel throat ranges from 1.1 to 1.8R.扫气流道 R 扫气流道 Let h be the ordinate of the critical node R on the upper surface of the swept airflow channel profile, where the width at the throat is smaller than the width at the inlet. BO Less than h AN .

[0039] First, determine the coordinates of the six key nodes in the first group of key nodes as (x... A ,f A ), (x B ,f B ...、(x E ,f E ), (x F ,f F Specifically, in this embodiment, the coordinates of the first set of key nodes are A(0,157), B(53,182), C(100,125), D(201,51), E(294,39), and F(483,39).

[0040] S2. Set a slope value f' for each key node. A f' B …f' E f' F In this embodiment, the slope values ​​of each key node are set to f' in sequence. A =0.768, f' B =0, f' C =-1.43、f' D =-0.316、f' E =f' F =0

[0041] The slope value can be set to any constant, and the curve connecting the two adjacent points can be obtained. However, based on experience, a more appropriate slope value is usually set for each key node so that the final meridional flow channel profile has a better effect.

[0042] S3. Calculate and generate a two-degree-of-freedom adjustable curve between the two key nodes that need to be connected into a line. The function of the two-degree-of-freedom adjustable curve is as follows:

[0043] y=α0(t)f i +α1(t)f i+1 +β0(t)h i f' i +β1(t)h i f' i+1

[0044] in:

[0045]

[0046] hi =x i+1 -x

[0047] t=(xx i ) / h i

[0048] O i,1 O i,2 α0(t), α1(t), β0(t), and β1(t) are freely adjustable coefficients; α0(t), α1(t), β0(t), and β1(t) are adjustable basis functions.

[0049] In the AB curve of this embodiment, O i,1 =O i,2 =0; in the BC curve, O i,1 =0.2, O i,2 =0; in the CD curve, O i,1 =O i,2 =-1; In the DE curve, O i,1 =O i,2 =0; in the EF curve, O i,1 =O i,2 =0

[0050] The free adjustment coefficient can be set to any real number, and a curve connecting two adjacent points can be obtained. However, a suitable free adjustment coefficient is generally set based on experience to ensure that the final meridional flow channel profile has a better effect. Taking the two-degree-of-freedom adjustable curve between points NO on curve L2 as an example, the free parameter of the black solid line is set to 0. i,1 =O i,2 =0, the free parameter value of the red dashed line is O. i,1 =O i,2 =10. That is, when O i,1 and O i,2 When the values ​​are different, the shape of the curve between any adjacent key nodes can also change, provided that the key nodes and the node slopes are fixed.

[0051] S4. Calculate the two-degree-of-freedom adjustable curves between the remaining key nodes that need to be connected on the curve, and connect them to form the meridional flow channel profile of the non-rotational integral inertial particle separator.

[0052] Specifically, the coordinates of the five key nodes NR in the second set of key nodes are N(0,197), O(57,210), P(163,175), Q(261,175), and R(359,175), respectively. The slope values ​​set for NR are f', respectively. N =0.353, f' O =f' P =f' Q =f' R =0. The O value of the NO curve. i,1O i,2 The values ​​are all 0, and the O value of the OP curve is 0. i,1 O i,2 The values ​​are 0.2 and 0, respectively, and the O value of the PQ curve is... i,1 O i,2 The values ​​are all 0, and the O value of the QR curve is 0. i,1 O i,2 All values ​​are 0.

[0053] The coordinates of the seven critical nodes GM in the third group of critical nodes are G(359,163), H(259,163), I(160,163), J(112,163), K(110,161), L(294,98), and M(483,98). The slope values ​​set for GM are f'. G =f' H =f' I =f' J =0, f' K =∞, f' L =f' M =0. The O of the GH curve i,1 O i,2 The values ​​are all 0, and the O value of the HI curve is 0. i,1 O i,2 The values ​​are all 0, and the O value of the IJ curve is... i,1 O i,2 The values ​​are all 0, and the O value of the JK curve is 0. i,1 O i,2 The values ​​are all 0, and the O value of the KL curve is 0. i,1 O i,2 The values ​​are 2 and -0.2, respectively, and the O value of the LM curve is... i,1 O i,2 All values ​​are 0. The curve function between the two key nodes that need to be connected is calculated according to the method in step S3. Finally, the curve functions between all the key nodes that need to be connected are obtained to form a complete meridional flow channel profile.

[0054] S5. Rotate the meridional flow channel profile 360° around the x-axis in the coordinate system to generate a rotating body, thus obtaining the three-dimensional geometric configuration of the non-rotational integral inertial particle separator.

[0055] The irrotational integral inertial particle separator designed using the above method was experimentally tested to determine its efficiency in separating C-type sand (Arizona coarse dust). Figure 5 As shown, the scavenging ratio refers to the ratio of the flow rate of the particulate-containing airflow to the total inlet flow rate into the separator. Testing has shown that the designed vortex-free integral inertial particle separator meets the actual engineering design requirements.

Claims

1. A design method for a non-rotational integral inertial particle separator, characterized in that, Includes the following steps: S1. Establish an XY coordinate system and determine several key nodes on the meridional flow channel surface. The coordinates of the key nodes are (x1, f1), (x2, f2)...(x...). i ,f i ), (x i+1 ,f i+1 ); S2. Set slope values ​​f'1, f'2…f' for each key node. i f' i+1 ; S3. Calculate and generate a two-degree-of-freedom adjustable curve between the two key nodes that need to be connected into a line. The function of the two-degree-of-freedom adjustable curve is as follows: y=α0(t)f i +α1(t)f i+1 +β0(t)h i f' i +β1(t)h i f' i+1 in: h i =x i+1 -x t=(x-x i ) / h i O i,1 O i,2 α0(t), α1(t), β0(t), and β1(t) are freely adjustable coefficients; S4. Calculate the two-degree-of-freedom adjustable curves between all the key nodes that need to be connected, and connect all the obtained two-degree-of-freedom adjustable curves in sequence to form the meridional flow channel profile of the non-rotational integral inertial particle separator. S5. Rotate the meridional flow channel surface 360° around the x-axis in the coordinate system to generate a rotating body, thereby obtaining the three-dimensional geometric configuration of the non-rotational integral inertial particle separator.

2. The design method for a non-rotational integral inertial particle separator as described in claim 1, characterized in that, The meridional flow channel profile includes a mixed flow channel profile, a swept flow channel profile formed by the bifurcation of the mixed flow channel profile, and a main flow channel profile. The flow channel formed by the swept flow channel profile is used to separate sand and dust particles, and the flow channel formed by the main flow channel profile is used to allow airflow to pass through.

3. The design method for a non-rotational integral inertial particle separator as described in claim 2, characterized in that, The distance between the two most distant critical nodes in the x-axis direction is equal to the length of the air intake.

4. The design method for a non-rotational integral inertial particle separator as described in claim 2, characterized in that, The ordinate of the key node at the upper end face of the throat of the mixing channel profile ranges from 1.1 to 1.8R. 扫气流道 R 扫气流道 The coordinates are the ordinates of the key nodes on the upper surface of the swept airflow channel profile.

5. The design method for a non-rotational integral inertial particle separator as described in claim 1, characterized in that, The number of key nodes is 15-20.

6. The design method for a non-rotational integral inertial particle separator as described in claim 1, characterized in that, The slope value is an arbitrary constant.

7. The design method for a non-rotational integral inertial particle separator as described in claim 1, characterized in that, The O i,1 O i,2 It is an arbitrary constant.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 8.

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