An Eccentric Cylindrical Single Hole Pneumatic Probe with High Spatial Measurement Accuracy

Abstract

The invention discloses an eccentric cylinder single-hole pneumatic probe with high spatial measurement accuracy. The eccentric cylindrical single-hole pneumatic probe includes a capillary, a probe head and a support rod; the front end of the capillary is closed and the rear end is open, and a pressure measuring hole is opened on the front wall of the tube; the probe head is a conical frustum, a cylinder and a screw in turn. The probe head is provided with a step hole that runs through the front and back, the central axis of the step hole is parallel to the central axis of the probe head, and the distance between the two central axes is the capillary radius; the support rod is fixedly connected with the screw rod. The front and rear ends of the capillary extend out of the step hole, the pressure measuring hole at the front end is located on the central axis of the probe head, and the rear end connects the pressure measuring hose in the support rod, leading the pressure felt by the pressure measuring hole to the pressure sensor for Measurement. The eccentric cylindrical single-hole pneumatic probe has higher spatial measurement accuracy, simple processing and manufacturing, and low cost, and is suitable for accurate measurement of parameters such as air flow angle, Mach number, total pressure and static pressure in two-dimensional flow fields with strong velocity gradients.

Description

technical field [0001] The invention belongs to the technical field of aeroengine impeller mechanical aerodynamic testing, and in particular relates to an eccentric cylindrical single-hole pneumatic probe with high spatial measurement accuracy. Background technique [0002] Porous probes have been widely used to measure the magnitude and direction of flow field velocity, total pressure and static pressure and other aerodynamic parameters. However, when the porous probe is used to measure flow field parameters with strong velocity gradients such as wakes or boundary layers, the spatial gradient of the velocity magnitude will be misinterpreted because the holes of the porous probe are located at spatially separated points is the flow angle, resulting in flow field measurement errors. In order to reduce this measurement error, it is necessary to reduce the size of the measuring probe head as much as possible or reduce the spatial distance of the measuring hole. Contents of t...

AI Technical Summary

Problems solved by technology

However, when the porous probe is used to measure flow field parameters with strong velocity gradients such as wakes or boundary layers, the spatial gradient of the velocity magnitude will be misinterpreted because the holes of the porous probe are located at spatially separated points is the flow angle, resulting in flow field measurement error

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