混合気体の濃度と速度の測定法 : 熱線濃度計と半導体圧力センサを使用した場合

概要

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In order to measure concentration in gas flow, a probe which consists of a sonic nozzle and a hot-wire was developed. The concentration probe of this type was named hot-wire concentration probe. We already proposed a method of concentration and velocity measurements by the hot-wire concentration probe and an ordinary hot-wire probe, and simultaneously measured instantaneous values in the turbulent jets. The present paper deals with another method by using the hot-wire concentration probe, a piezoresistive sensor, and an impact tube. Instantaneous velocity in gas mixture is given from density measured by means of the hot-wire concentration probe and total pressure measured by the piezoresistive sensor and the impact tube. In the pulsating jet where carbon dioxide gas pulsed by a loudspeaker issues into still air, the concentration and the velocity are measured by the above two different methods. It is confirmed that the measured values by both methods agree well. The experimental results indicate that the pulsation enhances mixing of two gases. Also, concentration and velocity changes do not occur at the same time.
一般社団法人日本機械学会の論文
1998-08-25