Aeroprobe Multi-hole Probes

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Key features

• 3, 5 and 7-hole probes for multidirectional flow measurements
• Different probe geometries for confined spaces and complex flow channels
• Factory calibrated probes with high accuracy and high-temperature options

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Multi-hole probes for aerodynamic flow measurement

Aeroprobe Multi-hole Probes measure flow velocity and direction in aerodynamic research, wind tunnels, turbomachinery and industrial test facilities. By measuring pressure differences across multiple openings, these probes determine the local flow vector, providing information about both flow speed and direction.

The portfolio includes 3, 5 and 7-hole probes in different geometries and sizes. This allows engineers to select a suitable configuration for applications ranging from small compressor flow channels to large wind turbine measurements.

Factory calibration supports accurate measurements across a defined range of flow angles and velocities. Aeroprobe offers probes for low subsonic to supersonic flow conditions, as well as specialised designs for high temperatures and restricted installation spaces.

Probe geometries for different measurement conditions

Straight probes

Straight probes position the measuring tip directly in the airflow. They are commonly used in wind tunnels and test facilities where the probe can be aligned with the incoming flow.

L-shaped probes

L-shaped probes position the measuring tip away from the mounting shaft. This reduces airflow obstruction downstream of the probe and provides flexibility when sufficient installation space is available.

Cobra probes

Cobra probes are suitable for measurements where the probe must be rotated around its axis. Their geometry keeps the measuring tip in approximately the same position during rotation, making them useful for flows with changing directions.

Drilled elbow and eccentric ferrule probes

These configurations are designed for confined spaces, particularly in turbomachinery. Their compact geometry allows measurements between blade rows and in narrow flow channels.

High-temperature probes

Aeroprobe offers specialised probes manufactured from high-strength nickel alloys for measurements in hot gas flows. These configurations can withstand temperatures up to 900°C, depending on the design.

Aerodynamic calibration and measurement accuracy

Aeroprobe provides factory calibration using dedicated wind tunnel facilities. Calibration establishes the relationship between the measured pressure distribution, flow velocity and flow direction.

Depending on the selected probe and calibration, Aeroprobe specifies flow-angle accuracy of ±1° and velocity accuracy of ±1 m/s or 1%, whichever is greater.

The calibration range can extend from Mach 0.05 to Mach 1.8. The applicable measurement range depends on the selected probe configuration.

Applications

Wind tunnel testing

Measure flow velocity and direction around aerodynamic models, test sections and experimental installations.

Turbomachinery

Analyse airflow in compressors, turbines and narrow passages between blade rows. Compact probe geometries allow measurements in locations with limited access.

Automotive aerodynamics

Investigate airflow around vehicles and components during aerodynamic development and wind tunnel testing.

Energy and industrial research

Measure flow conditions in wind energy applications, gas turbines and industrial test facilities.

Selecting the right multi-hole probe

The appropriate probe depends on the expected flow velocity, flow-angle range, temperature, available installation space and required measurement accuracy.

Althen Sensors & Controls helps engineers select suitable Aeroprobe probe geometries and calibration options for their measurement application.

Please contact Althen to discuss your aerodynamic measurement requirements.