The 3-hole pitot probe is a fundamental tool in flow field measurement, but its structural design and compatibility with application scenarios directly affect data accuracy.Sensor Calibrationwelcome to click on the website to learn more!
Core Structural Features:
- The head is symmetrically conical, with 3 pressure-measuring holes arranged in a "1+2" pattern (1 central hole for total pressure, 2 symmetric side holes for static pressure, typically with an included angle of 45° or 60°);
- The probe stem diameter ranges from 3-8mm, and the ratio of stem length to diameter (L/d) is recommended to be ≥10 to ensure stability in airflow without shaking;
- Materials are mainly stainless steel (304/316), with titanium alloy for low-temperature scenarios and ceramic coating for high-temperature (<500℃) environments.
Adaptability to 1D Flow Fields:
It is only suitable for 1D flow fields with a single airflow direction and turbulence intensity <5% (e.g., axial airflow in pipelines, wind tunnel stable sections). This is because:
- The side holes can only sense static pressure differences in symmetric directions and cannot resolve deflection angles in multi-dimensional airflow;
- When the airflow direction deviates from the probe axis by more than 15°, measurement errors will surge to over 5% (in practice, invalid data due to installation skew was encountered in a pipeline test).
Practical Tips:
Use a laser collimator during installation to ensure the probe axis aligns with the airflow direction. The calibration cycle is recommended to be 300 hours (shortened to 200 hours for frequent use).