Report of Marina Gridchina
In spring at 2004 I was in Japan, Sendai as internship student. The scientific purpose of my work was to obtain the new interesting results from the experiments.
First of all I have represented two reviews for Japanese colleagues. The first report was about the main works of Physical Hydrodynamic and Relaxation Processes Laboratory Department of Molecular Physics Faculty of Physics M.V. Lomonosov Moscow State University. And the second report concerned my direct research work. The discussions following the both reports were very interesting and useful for my collegues and me.
Also I listened professor’s K. Takayama lecture “Was Adam a left-hander?” It was very beautiful slides with pictorial paintings.
Then I participated in “Symposium on Shock Waves” which taken place in Chiba University. It was international symposium in my research field. It is very important for me to take part in such actions. Because similar conferences permit to discuss the development of actual problems of hypersonic flow dynamics and present perspective methods of gas dynamics.
The great interest is subsequent development of actual problems of hypersonic flow dynamics, present perspective methods of gas dynamics. The laboratories in Tohoku University are equipped with modern facility that permits to obtain the important results. There are applied the new methods of data handling and result’s demonstration in experiments. It is also saving the communication of experience in scientific research. I consider the high level of the present state of science in Tohoku University in my field.
At the first time I explored the possibilities and basic working principles of expansion tube. It was proposed to study the supersonic flow behind investigated model in expansion tube. This question was analyzed in M.V. Lomonosov Moscow State University (Russia). But registration device not permitted to obtain the accurate picture. The modern facility in Tohoku University permits to investigate these complicate problems.
It was decided to carry out the experiments for two investigated models. First model is presented the plane plate with opening. The investigated model was disposed in dump tank in front of the shock tube section. The experiments were carried out for two different initial conditions.
At first the emission from the shock front was visualized. As a result of this experiment the picture of emission from shock front behind the investigated model is obtained.
But we needed the picture of flow behind the investigated model without the emission from shock front. In order to obtain this result it was decided to reduce Mach number for shock wave. It is possible only for case when the expansion tube is used as the shock tube. In the result, during my work on expansion tube, it was suggested the new application of expansion tube as a shock tube.
In this experiment was used only shock tube, acceleration tube and dump tank sections. This configuration has permitted to obtain the accurate and visual distribution of flow. As a result of this experiment the picture of flow behind the investigated model is obtained.
As regards the experiments with the second investigated model. It was formulated the problem, made more exact the technical details and the models were manufactured for this experiment. As it turned out this is large fundamental problem demand of a considerable amount of time. And probably, this experiment will be carry out in future.
In general I was very glad to participate in International Internship Program hosted by 21st century COE of Flow Dynamics. I think that Japan is a beautiful country with good people and traditions. It’s very pleasant for me to meet and work with Japanese colleagues.
I would like to notice the good work of “21st Century COE of Flow Dynamics”. This program permits to the students from other countries meet with colleagues from Japan and discuss of modern scientific problems. The participation of foreign students in Japanese laboratories gives a good sense of international cooperation toward the new achievement of common research themes.
Finally, I humbly thank all members of laboratory for human kindness and great assistance. I hope that my visit to Sendai this time would be the initiation of good scientific communication and friendship.