CN-122021396-A - Method, device, equipment and medium for rapidly estimating hydrodynamic force of propeller

CN122021396ACN 122021396 ACN122021396 ACN 122021396ACN-122021396-A

Abstract

The invention provides a method, a device, equipment and a medium for rapidly estimating hydrodynamic force of a propeller, which comprise the steps of cutting a single blade profile of a three-dimensional geometric model of the propeller by adopting a plurality of curved surfaces which are coaxial with the propeller and have different radiuses to form a group of quasi-two-dimensional curved surface calculation models, rapidly meshing each quasi-two-dimensional curved surface calculation area containing the propeller tangential surface, setting flow field boundary conditions and flow field initial conditions for the partitioned calculation areas, carrying out non-compressible flow pressure correction method based on the set conditions, carrying out non-constant value calculation, solving and obtaining axial force and circumferential force born by curved surface wing profiles in the partitioned calculation areas under different working conditions, and approximately calculating total thrust and total torque born by blades of the propeller by radial integration based on axial force and circumferential force on different section positions and each section so as to solve the problems that flow field mutual influence is difficult to evaluate and unbalance of traditional efficiency and precision in complex propeller design.

Inventors

MA YU
CAO GUANYU
Wang aobo
ZHANG ZIJUN
KANG GUOJIAN

Assignees

中国航天空气动力技术研究院

Dates

Publication Date: 20260512
Application Date: 20251225

Claims (10)

1. The method for rapidly estimating the hydrodynamic force of the propeller is characterized by comprising the following steps of: cutting a single blade profile of a three-dimensional geometric model of the propeller by adopting a plurality of curved surfaces which are coaxial with the propeller and have different radiuses to form blade tangential surfaces with different radiuses, so as to obtain a group of quasi-two-dimensional curved surface calculation models; carrying out rapid grid division on each quasi-two-dimensional curved surface calculation region containing the propeller tangent plane profile, and setting flow field boundary conditions and flow field initial conditions for the divided calculation regions; based on the set conditions, adopting an incompressible flow pressure correction method to perform non-constant value calculation, and solving and obtaining axial force and circumferential force born by the curved wing profile in each divided calculation area under different working conditions; and (3) approximately calculating the total thrust and the total torque born by the blades of the propeller through radial integration based on different section positions and the axial force and the circumferential force of the curved wing profile on each section.
2. The method for rapidly estimating the hydrodynamic force of a propeller according to claim 1, wherein the method for rapidly estimating the hydrodynamic force of the propeller comprises the steps of cutting a single blade profile of a three-dimensional geometric model of the propeller to form blade sections with different radii by using a plurality of curved surfaces which are coaxial with the propeller and have different radii, and obtaining a set of quasi-two-dimensional curved surface calculation model, and specifically comprises the following steps: Generating a three-dimensional geometric model comprising a rotor and a stator according to design parameters of the propeller; a plurality of evenly distributed cutting surfaces are arranged along the radial direction of the propeller and perpendicular to the hub surface by taking a rotating shaft as a reference, and the cutting surfaces are cylindrical curved surfaces or small-gradient conical curved surfaces; And cutting each blade curved surface of the three-dimensional geometric model through the cutting surface to form blade tangential surfaces under different radiuses, and respectively selecting the cross-sectional shape of a representative blade in each tangential surface to generate a quasi-two-dimensional curved surface calculation model.
3. The method for rapidly estimating the hydrodynamic force of a propeller according to claim 2, wherein a plurality of evenly distributed cutting surfaces are provided, the number of which is 8-10; the quasi-two-dimensional curved surface calculation model comprises a combination of a single rotor blade and a single stator blade corresponding to axial front and back positions or a combination of two rotor blades with opposite rotation directions corresponding to axial front and back positions.
4. The propeller hydrodynamic force rapid estimation method according to claim 1, characterized in that the rapid meshing comprises the steps of: adopting unstructured triangular grids to align with the two-dimensional curved surface calculation area for point distribution; And (5) carrying out grid encryption on a local area where the blade wall surface is positioned.
5. The propeller hydrodynamic force rapid estimation method according to claim 1, wherein the flow field boundary condition and the flow field initial condition are set for the divided calculation region, specifically comprising the steps of: setting the direction of the calculation area facing to the incoming flow as a speed inlet, and setting the other axial side corresponding to the speed inlet as a pressure outlet; setting a boundary surface in the circumferential direction as a periodic boundary; the setting of the initial conditions includes setting the initial velocity and initial pressure of the flow field within the calculation region to zero.
6. The propeller hydrodynamic force rapid estimation method according to claim 1, wherein the non-constant value calculation is performed by using a non-compressible flow pressure correction method based on the set condition, specifically comprising the steps of: Giving initial values of a pressure field and a velocity field; Solving a nonlinear vector in an equation based on the initial value, and solving an Euler equation by adopting an explicit method to obtain axial and circumferential speed values; calculating a new acceleration value according to the axial and circumferential speed values, obtaining a new nonlinear vector from the acceleration value, and substituting the new nonlinear vector into a linear system to obtain updated axial and circumferential speed values; Calculating the mass unbalance according to the updated axial and circumferential speed values, and solving a poisson equation to obtain a pressure correction value; Calculating new speed and pressure values based on the pressure correction values; And judging whether the new speed value and the new pressure value meet a continuity equation, if so, stopping calculation, and if not, returning to the step of solving the equation, and repeating iteration.
7. The method for rapidly estimating the hydrodynamic force of the propeller according to claim 1, wherein the total thrust and the total torque applied to the blades of the propeller are approximately calculated by radial integration based on the axial force and the circumferential force of the curved wing profile on each section and different section positions, specifically comprising the steps of: For each quasi-two-dimensional curved surface calculation model, curve integration is carried out on the pressure distribution of the curved surface airfoil, and the axial force and the circumferential force borne by the curved surface airfoil are respectively obtained; and (3) approximately popularizing the stress obtained by calculating the positions of each section to the average stress covering the adjacent radial areas, carrying out weighted summation by combining the radial lengths corresponding to the sections, and obtaining the total thrust and the total torque of the propeller blade by superposition calculation.
8. A propeller hydrodynamic force rapid estimation device, characterized by comprising: The two-dimensional model calculation module is used for cutting a single blade profile of a three-dimensional geometric model of the propeller by adopting a plurality of curved surfaces which are coaxial with the propeller and have different radiuses to form blade tangential surfaces with different radiuses so as to obtain a group of quasi-two-dimensional curved surface calculation models; The condition setting module is used for carrying out rapid grid division on each quasi-two-dimensional curved surface calculation area containing a propeller tangent plane, and setting flow field boundary conditions and flow field initial conditions for the divided calculation areas; The stress solving module is used for carrying out non-constant value calculation by adopting a non-compressible flow pressure correction method based on set conditions, and solving and obtaining axial force and circumferential force born by the curved wing profile in each divided calculation area under different working conditions; And the power estimation module is used for approximately calculating the total thrust and the total torque born by the blades of the propeller through radial integration based on the positions of different sections and the axial force and the circumferential force of the curved wing profile on each section.
9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the propeller hydrodynamic force rapid estimation method according to any one of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the propeller hydrodynamic fast estimation method according to any one of claims 1 to 7.

Description

Method, device, equipment and medium for rapidly estimating hydrodynamic force of propeller Technical Field The invention relates to the technical field of underwater vehicle propulsion device design, in particular to a method, a device, equipment and a medium for rapidly estimating the hydrodynamic force of a propeller. Background Currently, the main stream of propeller design of underwater propellers adopts a lift line design method. The method is characterized in that the propeller is equivalent to an attached vortex line with strength changing along the spanwise direction, and the lift force parameter of the propeller can be rapidly estimated through the simplified model. Practice proves that the method has good applicability in a single propeller design scene under the light load or medium load working condition, and can meet the basic design requirement. However, when designing a pump jet propeller, a counter-rotating propeller and other complex-structure propellers, the complexity of the flow field is obviously improved due to the mutual interference of the flow field between the rotor, the stator and the front and rear propeller blades. The design method of the lift line is difficult to accurately describe the mutual interference effect, if the interaction is ignored, the designed propeller shape can cause larger deviation between the actual propulsion efficiency of the propeller and the design expectation, and the design accuracy requirement of the complex propeller can not be met. Therefore, a method for rapidly estimating the hydrodynamic force of a propeller is needed to solve the technical problems that the flow fields in the complex propeller design are difficult to evaluate due to mutual influence, and the efficiency and the accuracy of the traditional method are unbalanced. Disclosure of Invention In order to overcome the problems in the related art, the present disclosure provides a method, a device, equipment and a medium for rapidly estimating the hydrodynamic force of a propeller, so as to solve the technical problems that the flow fields in the complex propeller design are difficult to evaluate due to mutual influence, and the efficiency and the accuracy of the traditional method are unbalanced in the related art. One or more embodiments of the present disclosure provide a method for rapidly estimating the hydrodynamic force of a propeller, including the steps of: cutting a single blade profile of a three-dimensional geometric model of the propeller by adopting a plurality of curved surfaces which are coaxial with the propeller and have different radiuses to form blade tangential surfaces with different radiuses, so as to obtain a group of quasi-two-dimensional curved surface calculation models; carrying out rapid grid division on each quasi-two-dimensional curved surface calculation region containing a propeller tangent plane, and setting flow field boundary conditions and flow field initial conditions for the divided calculation regions; based on the set conditions, adopting an incompressible flow pressure correction method to perform non-constant value calculation, and solving and obtaining axial force and circumferential force born by the curved wing profile in each divided calculation area under different working conditions; and (3) approximately calculating the total thrust and the total torque born by the blades of the propeller through radial integration based on different section positions and the axial force and the circumferential force of the curved wing profile on each section. Preferably, the method uses a plurality of curved surfaces coaxial with the propeller and having different radii to cut a single blade profile of a three-dimensional geometric model of the propeller to form blade tangential planes having different radii, thereby obtaining a set of quasi-two-dimensional curved surface calculation model, and specifically comprises the following steps: Generating a three-dimensional geometric model comprising a rotor and a stator according to design parameters of the propeller; a plurality of evenly distributed cutting surfaces are arranged along the radial direction of the propeller and perpendicular to the hub surface by taking a rotating shaft as a reference, and the cutting surfaces are cylindrical curved surfaces or small-gradient conical curved surfaces; And cutting each blade curved surface of the three-dimensional geometric model through the cutting surface to form blade tangential surfaces under different radiuses, and respectively selecting the cross-sectional shape of a representative blade in each tangential surface to generate a quasi-two-dimensional curved surface calculation model. Preferably, the number of the plurality of evenly distributed cutting surfaces is 8-10; the quasi-two-dimensional curved surface calculation model comprises a combination of a single rotor blade and a single stator blade corresponding to axial front and back positions or a comb