A Sensor Probe Blowing for Inspecting Conduit Interiors in Telecommunication Industry

介绍了一种用于电信行业管道内部检测的传感器探头，利用螺旋气流吹制了一种高稳定性的长距离吹制探头。传感器探头稳定可以通过控制三个物理因素来实现；探头尾部尾迹应稳定，搅拌较少，探头与导管内壁之间的环空流动不稳定性应小，探头前后压力分布应对称。这些要求是通过使用螺旋气流和流线型探头实现的。与其他探头相比，流线型探头在传感器探头后部产生较少尾迹搅拌的窒息流。螺旋气流陡峭的轴向速度分布使探头绕导管轴旋转，从而稳定了探头后部的尾迹。此外，它还使尾流尾部向导管轴方向固定，使螺旋气流保持陡峭的速度剖面。这种探头稳定是通过螺旋气流和探头之间的协同作用实现的。第二阶段投入实际应用，对降落伞牵引传感器探头的性能进行了研究。由于螺旋气流中径向分量的波动很小，在检查过程中，螺旋气流使降落伞保持充分充气，从而对降落伞产生了很大的阻力。给出了一个近似解来解释这种效应。

A sensor probe for inspecting conduit interiors in telecommunication industry has been blown with high stability trough long distances using spiral airflow.A sensor probe stabilization can be achieved by controlling three physical factors ; the wake in the rear of the probe should stabilize with less agitation, the annular flow instability between the probe and the inner wall of a conduit should be small, and pressure distributions between the front and the rear in a probe should be symmetric.These requirements has been achieved by using spiral airflow and streamlined probes. A streamlined probe should generate a smother flow with less agitation of wake in the rear of sensor probe compared to the other probes. A steep axial velocity distribution of spiral airflow has rotated a probe around the conduit axis, resulting in a stabilization of the wake in the rear of a probe. Furthermore it has fixed the tail of wake toward the conduit axis, leading the maintain of a steep velocity profile in spiral airflow. This probe stabilization was achieved by synergism between the spiral airflow and probe.Second stage to put to practical use, parachute performances for pulling a sensor probe has been investigated. Spiral airflow has helped to create a high drag force on the parachute by keeping the parachute fully inflated during the inspection process, due to a small fluctuation of radial component in spiral airflow. An approximate solution is presented to explain the effect.