抄録
Recently Dr. Jaeckel reported about the pumping speed that is affected to the oil vapour velocity.
Concerning the measurement of vapour velocity it is already researched by Dr. Jaeckel and Dr. Tajima, but the author used the calculation method applying the difference of vapour enthalpy.
The author noted the special consideration to the effect of thermal radiation that affect to the temperature measurement of jetted vapour.
There are some difficulties to the correction of the temperature rise caused by the friction heat of high speed gas flow, but the measurement of relative vapour speed can be easily done by this method.
