CN-122021453-A - CFD simulation parametric modeling method and system for axial flow rotor outlet throttling structure

CN122021453ACN 122021453 ACN122021453 ACN 122021453ACN-122021453-A

Abstract

The embodiment of the disclosure provides a CFD simulation parametric modeling method and system for an outlet throttle structure of an axial flow rotor, which are based on the outlet throttle structure of actual axial flow rotor test equipment, a simplified model is established for simulation calculation of the axial flow rotor, wherein a conical throttle ring structure with adjustable opening is arranged at an outlet section, and the actual axial flow rotor throttling process is simulated. In order to facilitate rapid adjustment of an axial flow rotor calculation model and grids, a geometric model parameterization and grid interpolation calculation method is adopted, and the outlet throttling state is simulated by applying the same grid topology and the same number of nodes and different grid node distribution, so that the simulation of different flow working conditions of the axial flow rotor is realized. The flow condition adjustment is realized by adjusting the boundary area of the outlet through the atmospheric pressure in the given test environment during the simulation calculation, and the mode of changing the static pressure of the outlet is not needed, so that the engineering actual problem in the pneumatic field of the axial flow rotor can be more accurately simulated.

Inventors

ZHANG HAO
XIAO JUNFENG
GAO SONG
LI YUANYUAN
YU FEILONG
DUAN JINGYAO
HE WEI
WU YAOZU
WU HE

Assignees

西安热工研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (10)

1. A method for CFD simulation parametric modeling of an axial flow rotor outlet throttle structure, the method comprising: A conical throttling ring connected with a hub is arranged at the outlet section of the axial flow rotor calculation domain, and the conical throttling ring and the outer casing form a contracted spray pipe structure with adjustable outlet flow area; establishing a functional relation between the cone angle of the conical throttling ring and the outlet flow of the axial flow rotor; According to the target flow, calculating a corresponding target cone angle based on the functional relation; And generating a target throttling structure grid corresponding to the target cone angle through a linear interpolation method based on the throttling structure grid of the initial cone angle.
2. The CFD simulation parametric modeling method for an axial flow rotor outlet throttle structure of claim 1, wherein a cone angle of the conical throttle ring is adjustable in a range of 20 ° to 60 °.
3. The CFD simulation parametric modeling method for an outlet throttle structure of an axial flow rotor according to claim 1, wherein the functional relationship between the cone angle of the conical throttle ring and the outlet flow of the axial flow rotor is as follows: In the formula, For the axial flow rotor outlet flow rate, Is the cone angle of the conical throttling ring, In order to achieve a fluid density, As the average flow rate at the outlet, Is equal to the cone angle Associated outlet flow area.
4. The CFD simulation parametric modeling method of an axial flow rotor outlet throttle structure according to claim 1, wherein the generating the target throttle structure grid corresponding to the target cone angle by a linear interpolation method based on the throttle structure grid of the initial cone angle comprises: and (3) keeping the topological structure, the node number and the distribution rule of the throttling structure grid unchanged, and carrying out linear interpolation calculation on the node coordinates corresponding to the target cone angle according to the geometric relationship between the node coordinates corresponding to the initial cone angle and the target cone angle to obtain the target throttling structure grid.
5. An axial flow rotor outlet throttle structure CFD simulation parametric modeling system, the system comprising: The structure definition module is used for arranging a conical throttling ring connected with the hub at the outlet section of the axial flow rotor calculation domain, and the conical throttling ring and the outer casing form a contracted spray pipe structure with adjustable outlet flow area; the parameter relation module is used for establishing a functional relation between the cone angle of the cone-shaped throttling ring and the outlet flow of the axial flow rotor; The cone angle calculation module is used for calculating a corresponding target cone angle based on the functional relation according to the target flow; and the grid generation module is used for generating the target throttling structure grid corresponding to the target cone angle through a linear interpolation method based on the throttling structure grid with the initial cone angle.
6. The axial flow rotor outlet throttle structure CFD simulation parametric modeling system of claim 5, wherein a cone angle of the conical throttle ring in the structure definition module is adjustable in a range of 20 ° to 60 °.
7. The CFD simulation parametric modeling system of an axial flow rotor outlet throttle structure of claim 5, wherein the functional relationship between the cone angle of the conical throttle ring and the outlet flow of the axial flow rotor in the parametric relationship module is as follows: In the formula, For the axial flow rotor outlet flow rate, Is the cone angle of the conical throttling ring, In order to achieve a fluid density, As the average flow rate at the outlet, Is equal to the cone angle Associated outlet flow area.
8. The axial flow rotor outlet throttle structure CFD simulation parametric modeling system of claim 5, wherein the grid generation module is specifically configured to: and (3) keeping the topological structure, the node number and the distribution rule of the throttling structure grid unchanged, and carrying out linear interpolation calculation on the node coordinates corresponding to the target cone angle according to the geometric relationship between the node coordinates corresponding to the initial cone angle and the target cone angle to obtain the target throttling structure grid.
9. An electronic device, comprising: at least one processor, and A memory communicatively coupled to the at least one processor for storing one or more programs that, when executed by the at least one processor, enable the at least one processor to implement the axial flow rotor meter-out structure CFD simulation parametric modeling method of any one of claims 1-4.
10. A computer readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the CFD simulation parametric modeling method of an axial flow rotor outlet throttle structure according to any one of claims 1 to 4.

Description

CFD simulation parametric modeling method and system for axial flow rotor outlet throttling structure Technical Field The embodiment of the disclosure belongs to the technical field of CFD simulation of an outlet throttling structure of an axial flow rotor, and particularly relates to a CFD simulation parametric modeling method and system of the outlet throttling structure of the axial flow rotor. Background The development of a numerical simulation method represented by CFD (Computational Fluid Dynamics ) technology brings great convenience to the experimental study of the impeller machinery, and particularly the application of high-performance calculation continuously improves the precision and reliability of the CFD, thereby providing important guidance for the early preparation and result verification of the experimental study. In the field of pneumatic research of axial flow rotors, a method combining numerical simulation and test is becoming more and more widespread. Conventional numerical simulation methods rely primarily on high-precision geometric models and meshing techniques, and secondarily on computational methods, boundary conditions, and settings for turbulence models. Typically, boundary conditions include import and export, dynamic and static interfaces, periodic interfaces, solid walls, and the like. The outlet boundary condition is generally given as static pressure or flow, and the adjustment of the simulation working condition is realized by changing the outlet static pressure or flow. However, the simulation of the static pressure or flow rate regulation cannot directly reflect the actual condition of the test environment, on one hand, the test condition is generally that the outlet of the tester is in an atmospheric environment or an exhaust chamber environment, the pressure is generally stable, and on the other hand, the outlet of the tester is provided with a throttling device for regulating the test working condition, and the device is generally simplified in the numerical simulation process and is not embodied. Although the conventional numerical simulation method is very mature for the pneumatic research of a general axial flow rotor, the simplified calculation model often causes deviation from actual test equipment, and further influences the accuracy of a numerical simulation result. In addition, in the field of axial flow compressors, research shows that the conventional axial flow compressor simulation method still has challenges on the numerical simulation accuracy of the near stall boundary, and it is difficult to effectively simulate the near stall working condition and obtain the accurate stall boundary. Disclosure of Invention The embodiment of the disclosure aims at solving at least one of the technical problems existing in the prior art and provides a CFD simulation parametric modeling method and system for an outlet throttle structure of an axial flow rotor. One aspect of the present disclosure provides a CFD simulation parametric modeling method for an axial flow rotor outlet throttle structure, the method comprising: A conical throttling ring connected with a hub is arranged at the outlet section of the axial flow rotor calculation domain, and the conical throttling ring and the outer casing form a contracted spray pipe structure with adjustable outlet flow area; establishing a functional relation between the cone angle of the conical throttling ring and the outlet flow of the axial flow rotor; According to the target flow, calculating a corresponding target cone angle based on the functional relation; And generating a target throttling structure grid corresponding to the target cone angle through a linear interpolation method based on the throttling structure grid of the initial cone angle. Further, the cone angle of the conical throttle ring is adjustable in the range of 20 ° to 60 °. Further, the functional relationship between the cone angle of the conical throttling ring and the outlet flow of the axial flow rotor is shown as follows: In the formula, For the axial flow rotor outlet flow rate,Is the cone angle of the conical throttling ring,In order to achieve a fluid density,As the average flow rate at the outlet,Is equal to the cone angleAssociated outlet flow area. Further, the generating, by a linear interpolation method, the target throttling structure grid corresponding to the target cone angle based on the throttling structure grid with the initial cone angle includes: and (3) keeping the topological structure, the node number and the distribution rule of the throttling structure grid unchanged, and carrying out linear interpolation calculation on the node coordinates corresponding to the target cone angle according to the geometric relationship between the node coordinates corresponding to the initial cone angle and the target cone angle to obtain the target throttling structure grid. Another aspect of the present disclosure provides an axial flow rotor