A Partition Interpolation Method for Five-hole Probes at Large Incoming Flow Angles

Abstract

The invention provides a partition interpolation method of a five-hole probe under a large incoming flow angle, which includes obtaining an inner zone interpolation file and an outer zone interpolation file; acquiring five-hole pressure values ​​collected by the five-hole probe, and determining according to the five-hole pressure value Interpolation partition mode, the interpolation partition mode is divided into inner zone mode and outer zone mode; when the interpolation zone mode is the inner zone mode, the five-hole pressure value is processed based on the inner zone interpolation file to obtain the flow field Total pressure and static pressure; when the interpolation partition mode is the outer zone mode, the five-hole pressure value is processed based on the outer zone interpolation file to obtain the total pressure and static pressure of the flow field; the total pressure and static pressure based on the flow field Calculate the velocity of the flow field. When the incoming flow angle of the probe is too large, the airflow in some areas of the probe will separate from the boundary layer, and the pressure-sensing hole in the separated area will fail, resulting in inaccurate measurement. The above-mentioned problems can be overcome by adopting the method of the invention, and the angle range of the incoming flow that the probe is adapted to is increased from ±30° to ±45°.

Description

technical field [0001] The invention relates to the field of wind tunnel engineering measurement, in particular, to a subarea interpolation method for a five-hole probe under a large inflow angle. Background technique [0002] As a flow field measurement tool, the five-hole probe is widely used in the plane cascade wind tunnel experiment. Using the traditional interpolation method can only measure the air flow within ±30° of the incoming flow. When the incoming flow angle is too large, the air flow in the part of the probe will be separated from the boundary layer, and the pressure-sensing holes in the separation area will be invalid, resulting in Inaccurate measurement. Under the condition of high angle of attack in the related experiments of the plane blade cascade, due to the severe separation of the boundary layer behind the cascade, the change of the airflow vector is large. In particular, the flow in the angular region of the flow field behind the grid is very comple...

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Problems solved by technology

[0003] According to the above-mentioned technical problem of inaccurate measurement due to the high angle of attack working condition exceeding the existing interpolation measurement range, a partition interpolation method for five-hole probes at large incoming flow angles is provided. Through the partition interpolation method, the adaptability of the probe is expanded. flow angle

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