Numerical Investigation of Effects of Lateral Forced Vibration on Measurement Results of a Cylindrical Pressure Probe

摘要

The cylindrical probes are widely used in aircraft measurements, while the inevitable vibration of the probe makes it difficult to avoid measurement errors.This paper presents the effects of lateral forced vibration on the pressure measurement with a cylindrical probe using the single fluid-solid coupling technology.Different vibration amplitudes and frequencies are given in the simulation.The case without vibration is treated as the baseline.In this paper the flow structure around the probe and the measurement errors is analyzed when the probe vibrates.The Karman vortex recurs because of vibration at the head of probe, and the flow structure is influenced by vibration and vortex shedding.The results show that the vibration causes both steady and transient measurement errors, and the transient measurement errors perform more sharply than the steady measurement errors.Vibration diminishes the effective range of yaw angle when the probe is used in transient measurement.In the steady measurement, vibration causes both total pressure and static pressure measurement errors, which rise with the vibration amplitude and frequency.In the transient measurement, the transient measurement errors change along with vibration phase angle, the maximum yaw angle error linearly increases with vibration amplitude and frequency, and the maximum total pressure and static pressure measurement errors are several times relationship with vibration amplitude and frequency.