Method and device for processing helicopter flow field data

Abstract

The embodiment of the invention discloses a method and device for processing helicopter flow field data, relates to the technical field of rotor aircraft design, can reduce numerical dissipation in the rotor tip vortex transportation process caused by a traditional second-order JST format, and is high in capturing precision of flow details such as tip vortexes. The method comprises the following steps: generating a Cartesian background grid and a skin unstructured grid, and acquiring grid data information; utilizing the grid data information to pre-search and store the unit serial number of avirtual node, which corresponds to each interface and is required for constructing a seven-order WENO format, on a Cartesian background grid; obtaining left and right state values of a unit interface,solving a convection flux value to generate a Cartesian background grid and a skin unstructured grid, obtaining grid data information, and utilizing the grid data information to be on the Cartesian background grid; searching a unit serial number of a virtual node corresponding to each interface and required for constructing a seven-order WENO format in advance, storing the unit serial number, acquiring left and right state values on the unit interface, and solving a convection flux value; performing iterative processing on the flux in the flow field by utilizing the acquired flux on the unitinterface, and converging a processing result; and outputting the processing result to a display device. The invention is suitable for processing flow field data such as propeller tip vortexes.

Description

technical field [0001] The invention relates to rotorcraft design technology, in particular to a method and device for processing helicopter flow field data. Background technique [0002] Helicopter is an aeronautical vehicle with rotor as the main source of lift, and has been widely used in various fields of military and civilian use. The development of the new era requires that the helicopter has the characteristics of high speed, long range, low noise and low vibration, and the aerodynamic characteristics of the rotor have a great influence on these characteristics. Therefore, the research on the aerodynamic characteristics of the rotor is very important for the development of the helicopter. [0003] With the improvement of computer performance, computational fluid dynamics (CFD) method can be used to analyze the rotor flow field and aerodynamic characteristics. Rotor CFD technology has the advantages of low cost and less time-consuming, which can effectively reduce R&...

AI Technical Summary

Problems solved by technology

[0004] However, JST needs to add artificial dissipation items in the application, which requires additional calculations, and its accuracy at discontinuities and boundaries is low

Moreover, due to the serious numerical dissipation of the blade tip vortex during the transportation process, the ability to capture the flow details such as the blade tip vortex is poor. Poor ability to capture flow details

This problem has seriously affected the research and development efficiency and difficulty of rotorcraft

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