抄録
In recent automotive engineering, the radiation of the heat generated by the engine is becoming a very big problem. This is caused by other recent technologies such as the high powered engine, the compact engine compartment, the front-engine-frontdrive layout and the streamlined body.
It is important to visualize the heat flow and the air flow in the engine compartment in order to investigate this problem effectively. An infrared imaging thermometry technique and a flow visualization technique with liquid nitrogen are developed and described here. The temperature distribution in the engine compartment can be understood at a glance by the former, and the latter can be easily and safely used in a closed-circuit wind tunnel.
These two techniques enable us to find how the heat is carried by the air flow in the engine compartment at various driving conditions. Thus, the combination of the two can be concluded to be useful.
