The velocity measurement principle of the three-hole probe: The velocity measurement of the three-hole probe is based on the pressure difference principle in fluid mechanics. The main body of the probe is cylindrical in shape, with three pressure measurement holes symmetrically distributed at the head, and adjacent hole positions are arranged at a 120° Angle. High-precision pressure sensors are connected inside the hole channels, which can capture the static pressure changes at each hole position in real time. When the probe is placed in the flow field, each pressure measurement hole generates pressure differences due to different fluid impact angles, and this difference has a definite geometric relationship with the flow velocity direction.
During the pressure measurement process, three hole positions form a spatial coordinate system. Let the incoming flow velocity be V, forming an Angle of attack α and a yaw Angle β with the probe axis. According to the Bernoulli equation derivation, the pressure values at each hole position satisfy a specific relationship. By solving three independent equations simultaneously, the unknown total pressure can be eliminated and the velocity vector component can be obtained. The data processing adopts the triangular relationship solution algorithm. After converting the voltage signals collected from the three pressure measurement holes into pressure values, they are substituted into the pre-calibrated angle-pressure relationship curve. This curve is established through the wind tunnel calibration experiment, corresponding to the pressure coefficient distribution of each hole under different attack angles, thereby accurately calculating the velocity and direction of the fluid.
What are the testing advantages of three-hole probes?
High-precision measurement: The three-hole probe adopts a high-precision pressure sensor, which can provide relatively accurate fluid velocity measurement results under suitable measurement conditions. Through precise wind tunnel calibration, its measurement accuracy can be effectively guaranteed.
Multi-parameter measurement: It can not only measure the velocity of the fluid, but also simultaneously obtain information such as the Angle of attack and yaw Angle of the incoming flow, providing more comprehensive data for flow field analysis.
Wide application range: It is suitable for airflow measurement in the low-speed to subsonic range and has extensive applications in numerous fields such as aerospace, automotive engineering, and ventilation systems.
The advantages of Windtuner Technology in customizing three-hole probes
Personalized design: Windtuner can provide personalized design for three-hole probes based on the specific needs and application scenarios of customers. Whether it is the size and shape of the probe, or the layout and specification of the pressure measurement holes, they can all be customized to meet the special requirements of different flow field measurement environments.
High-precision manufacturing process: With advanced manufacturing techniques and a strict quality control system, the customized three-hole probes ensure high precision and good consistency. During the processing of the probe, the dimensional tolerances of each part can be precisely controlled to ensure the accuracy and surface finish of the pressure measurement holes, thereby enhancing the accuracy of the measurement.
Professional calibration service: We offer professional wind tunnel calibration services and establish precise angle-pressure relationship curves. Through a strict calibration process and advanced calibration equipment, it is ensured that the customized three-hole probe can provide reliable and accurate measurement data under various working conditions.
Technical support and after-sales service: Windtuner Technology has a professional technical team that can provide customers with comprehensive technical support and after-sales service. During the use of the probe, if any problems arise, customers can obtain timely and effective solutions.
The three-hole probe plays a significant role in flow field measurement due to its unique velocity measurement principle and testing advantages. Windtuner Technology's strength in customizing three-hole probes enables it to better meet the diverse needs of customers and provide strong support for fluid mechanics research and engineering applications.
