Omnidirectional atmospheric data measurement spherical probe

Abstract

The invention provides an omnidirectional atmospheric data measurement spherical probe and provides an atmospheric data measurement instrument that is simple in structure, large in acquisition angle range, high in reliability, small in size and light in weight. According to the technical scheme of the invention, for different airflow angles, pressure measuring points on a spherical body are partitioned, and the partition areas of the pressure measuring points are positioned on the front, rear, left, right and top spherical surfaces of the hollow spherical body (1). The partitioned pressure measuring points are realized through a pressure cavity (3) in connection with the hollow spherical body and pressure measuring holes (2) uniformly distributed in the cross-shaped manner at intervals. The pressure measuring holes transmit the pressure to a pressure scanning valve (5) through a pressure measuring pipe (4). The pressure scanning valve converts a received pressure signal into a digital signal. Meanwhile, the pressure scanning valve transmits the digital signal to a calculation unit (6) arranged in the hollow spherical body, so that atmospheric parameters and the current atmospheric data information of an aircraft are calculated by the calculation unit. In this way, the simultaneous acquisition and the omnidirectional measurement of multi-point pressures at different airflow angles in different areas can be achieved.

Description

technical field [0001] The invention relates to an air data probe used for measuring various atmospheric parameters such as omnidirectional vector velocity, altitude, lift velocity, and indicated airspeed of a rotorcraft. Background technique [0002] The movement of air produces airflow, and the flow velocity is a three-dimensional space vector. Generally considered as (xy plane) two-dimensional vector: wind speed - modulus, wind direction - direction, in some special cases, the vertical motion is also quite significant, such as strong convective clouds. Airflow field = large-scale regular airflow + (medium) small-scale turbulence that fluctuates randomly with time and space. Airflow measurement includes two parts: instantaneous quantity and average quantity. Average: Refers to the average over a certain period of time. Instantaneous value: averaged over a relatively short period of time. Both instantaneous and average quantities can be considered as "smooth value". The...

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Problems solved by technology

Both of the above two measurement methods have different defects. The first measurement method cannot realize the collection of omnidirectional air data parameters due to the limited measurement range of its angle of attack and sideslip angle sensors, and is greatly affected by the installation location.

Secondly, the structure is complex, the number of LRUs is large, the internal cables and air passages are messy, and the total weight and volume are too large

The second measurement method integrates all the functions of the first method, but its defect is that because the sensor is a mechanical sensor, the internal structure is complex, there are a large number of mechanical transmission parts, and its reliability is low. The cross-linking of the rotating structure requires good dynamic sealing technology, and the current dynamic sealing technology requires regular replacement of the sealing fluid, and the use and maintenance costs are relatively high

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