Pulsed Wire Anemometerの応答

Abstract

A pulsed wire anemometer which consists of a pulsed wire and two sensor wires was developed for the measurement of a highly turbulent flow by detecting the flying time of a heated tracer. This paper describes the effects of a high pass filter and of the viscous wake of the pulsed wire on the signal which is detected by the sensor wires.Theoretical analysis shows that the effect of the high pass filter is remarkable at the tail part, but is very small on the front part of the signal. This means the high pass filter has little effect on the measurement of the flying time. To measure the response curve precisely, an Analogue-to-Digital converter and a core memory system is used. The experimental response curve is compared with the theoretical one, and close agreement between the thoertical and the experimental signals is obtained. The effects of the viscous wake on the signal are examined by the same measurement system. The results show that the viscous wake of the pulsed wire effects the flying time especially for low Péclet number flow measurement, and the optimum condition for the probe design is obtained.