抄録
The variation of the flow around an O 2-sensor element due to the difference in the shape of a protective tube of the sensor was examined by the visualization experiment. Sensor models with the shape of four kinds of the protective tube were used in the experiment. The soots of exhaust gas does not adhered on the element in 4-slits model since the strongly circulating flow is not directly touch the element. But the soots adhere on the element in 9-slits model compared with 4-slits type. Two stream are observed in the plover model, also the turbulence in this flow is strong.
