Small-disturbance high-resolution dynamic probe for measuring secondary flow in rotor-stator end region

Abstract

The invention belongs to the technical field of subsonic three-dimensional flow field parameter testing, and particularly relates to a small-disturbance high-resolution dynamic probe for measuring secondary flow in a rotor-static end region. The probe comprises a probe head, a supporting rod, dynamic pressure sensors and a positioning block, the probe head comprises a cylinder and a double-twisted-wire rotating body which share the bottom surface, the two dynamic pressure sensors are packaged in the probe head, and the side face of the double-twisted-wire rotating body and the side face of the cylinder on the same side of the probe head are each provided with a pressure sensing hole, the pressure sensing hole is respectively communicated with the dynamic pressure sensor packaged in the probe head, the sensor cable is led out of the probe tail through a channel in the probe support rod, and the probe tail is sleeved with a positioning block. According to the invention, through calibration of the calibration wind tunnel, dynamic changes of three-dimensional flow field parameters of the secondary flow in the rotor-static end region of the turbine can be measured, the flow field parameters comprise an airflow pitch angle, an airflow deflection angle, total pressure, static pressure and Mach number, and an actually measured data basis is provided for improving the performance of the turbine. Compared with other double-hole dynamic pressure probes for measuring the subsonic three-dimensional flow field, the double-hole dynamic pressure probe has a positioning function, the probe head adopts a double-twisted-wire rotating body structure, the vertical distance between the circle center of a pressure sensing hole and the lowest point of the probe head is small, and the distance between the circle center of an inclined hole and the circle center of a positive hole is small, the probe has the advantages of small interference to an end region flow field, high spatial resolution, high frequency response and capability of accurately measuring dynamic changes of a secondary flow pitch angle, an airflow deflection angle, total pressure, static pressure and Mach number in a turbine rotor-static end region.

Description

technical field [0001] The invention belongs to the technical field of subsonic three-dimensional flow field parameter testing, in particular to a small-disturbance high-resolution dynamic probe for measuring the secondary flow in the end zone between the rotor and the stator, which is suitable for measuring the secondary flow in the end zone between the rotor and the stator of the turbine. The dynamic change of flow field parameters, flow field parameters include airflow pitch angle, airflow deflection angle, total pressure, static pressure and Mach number. Background technique [0002] Obtaining the flow field parameters of the secondary flow in the rotating and static end zone of the fan, compressor, turbine, pump, fan, compressor and other impellers plays an important role in improving the performance of the impeller. The end area of ​​the turbine rotor includes the blade tip area and the blade root angle area. For the test of the three-dimensional flow field parameters ...

AI Technical Summary

Problems solved by technology

[0005] At present, there are few introductions about the probe positioning block. For example, a pressure probe positioning block is introduced in patent 201710200518.3. A bubble level is installed on one side of the positioning block base. The positioning block has disadvantages such as large size and single positioning surface.

Images