Dynamic Five-Hole Probe With Remote Sensors For Unsteady Flow
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Solution Overview
Problem
Current dynamic pneumatic probes face challenges in achieving high frequency response, spatial resolution, and cost-effectiveness due to design contradictions, such as resonance effects from sensor cavities, complex probe tip structures, and high manufacturing costs, which limit their ability to accurately measure three-dimensional unsteady flow fields in impeller machinery.
Innovation Solution
A dynamic five-hole probe design featuring a hemispherical pressure sensing part with remotely installed pressure sensors, an L-shaped pressure measuring hole transition section, and flexible wall pressure buffering tubes, which reduces probe tip size, minimizes signal distortion, and enhances frequency response by absorbing unsteady fluctuations, allowing for precise measurement of three-dimensional airflow components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional contact measurement probes are used, then high frequency response can be achieved, but the probe interference on airflow cannot be prevented
Solution Approach 1:
The sensor is extracted from the probe tip and remotely installed in the holder, separating the sensing function from the flow-interacting structure. This allows the probe tip to be minimized to reduce airflow interference while the sensor is positioned optimally for frequency response.
Solution Approach 2:
The probe system is segmented into distinct functional components: the pressure sensing part (probe tip with holes), the pressure measuring hole transition section, and the pressure acquisition section (holder with remotely installed sensor). This segmentation allows independent optimization of each component.
2Ease of manufacture
If sensor cavity structures are used, then sensor installation is simplified, but resonance effects and signal distortion occur
Solution Approach 1:
The sensor is extracted from the probe tip cavity and remotely installed in the holder, eliminating the resonance-prone cavity structure at the probe tip while maintaining simple sensor installation through the standardized holder mounting.
Solution Approach 2:
The pressure measuring hole transition section acts as an intermediary, transmitting pressure signals from the probe tip holes to the remotely installed sensor in the holder without requiring the sensor to be directly mounted in a cavity at the tip.
3Measurement precision
If probe tip size is reduced for better spatial resolution, then measurement precision improves, but manufacturing complexity increases
Solution Approach 1:
The probe system is segmented so that the complex multi-hole structure is concentrated in the probe tip while the sensor installation is simplified in the holder. This allows minimal probe tip design for spatial resolution without compromising sensor mounting complexity.
Solution Approach 2:
The transition section serves as an intermediary that connects the minimal probe tip to the sensor holder, managing the complexity of connecting multiple small holes to the sensor without requiring complex probe tip structures.
4Stability of the object's composition
If traditional probe designs are used, then structural stability is maintained, but dynamic frequency response is limited
Solution Approach 1:
The sensor is extracted from the probe tip and remotely installed in the holder, allowing the probe tip to be minimized for better frequency response while the holder provides structural stability and sensor mounting support.
Solution Approach 2:
The probe design optimizes for dynamic measurement performance by minimizing the probe tip mass and stiffness, while the holder provides the necessary structural stability. This dynamic optimization enables higher frequency response while maintaining overall system stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The probe achieves a dynamic frequency response of 20-30 kHz and improved spatial resolution with a reduced probe tip size, while maintaining low manufacturing and maintenance costs, effectively addressing the limitations of existing probes in unsteady flow field measurements.
Implementation Method 1
the acquisition section pressure measuring holes of the pressure acquisition section are configured to measure a dynamic pressure of an airflow
Implementation Method 2
flexible wall pressure buffering tubes, which reduces probe tip size, minimizes signal distortion, and enhances frequency response by absorbing unsteady fluctuations
Data Source
AI summary
A dynamic five-hole probe includes a pressure sensing part, a pressure measuring hole transition section, a pressure acquisition section, dynamic pressure sensors and flexible wall pressure buffering tubes, the pressure sensing part being provided with pressure measuring holes to sense three dimensional dynamic pressure components of an airflow; the pressure measuring hole transition section transits from an inlet end surface five-hole structure into an outlet end surface five-hole structure; the pressure acquisition section has therein a centrally symmetric pressure measuring hole structure; pressure sensor mounting holes are in communication with the five pressure measuring holes; each of the dynamic pressure sensors is mounted in a corresponding one of the sensor mounting holes to measure a dynamic pressure of the airflow. The pressure sensing part may have a diameter of 3 mm or less.