Qian Xuesen's deeds

Among the outstanding contemporary scientists in China, there are three people whose names are Qian Xuesen, Qian Sanqiang and Qian Weichang. They are called "San Qian". They all came back from studying abroad with the heart of serving the motherland. Among them, Qian Xuesen's experience is the most thrilling.

Qian Xuesen spent 20 years in the United States, made outstanding achievements in aviation science, became a famous rocket expert and made contributions to American military science. 1949, he was very excited when he learned that the new China was founded, and decided to go back to China to participate in the construction. However, the United States is hostile to China, fearing that Qian Xuesen's return to China would be detrimental to them, so it tried every means to obstruct it.

The deputy secretary of the US Navy also said viciously, "I would rather shoot him than let him leave the United States. He knows too much, and one person can top five divisions! " Therefore, the US falsely accused Qian Xuesen of being a spy in China and arrested him. Although he was later released, he was still under close surveillance.

Qian Xuesen did not give in, lodged a solemn protest with the United States, and his determination to return to China was even greater. He put away three small boxes at home, ready to start at any time. After that, Qian Xuesen, who was detained by the US for five years under the questioning of the China government, finally returned to China by boat at 1955. He came to Tiananmen Square and said excitedly, "I believe I can definitely come back, and now I finally come back!" " "

After returning to China, Qian Xuesen made great contributions to China's missile and space undertakings and was one of the most prestigious scientists.

Extended data:

Qian Xuesen has done pioneering work in many fields of mechanics. He has made many achievements in aerodynamics, the most prominent of which is the similarity law of transonic flow. Together with Carmen, he put forward the concept of hypersonic flow for the first time, which provided a theoretical basis for aircraft to overcome thermal and sound barriers in the early stage and laid an important theoretical foundation for the development of aerodynamics.

The formula used in the design of high subsonic aircraft is Carmen-Qian Xuesen formula, named after Carmen and Qian Xuesen. In addition, Qian Xuesen and Carmen put forward a new nonlinear instability theory of spherical shells and cylindrical shells in the late 1930s. ?

Qian Xuesen has done pioneering work in aerodynamics and solid mechanics of applied mechanics; The research on compressible boundary layer carried out in cooperation with von Carmen reveals some temperature changes in this field, and establishes the "Carmen-Qian approximation" equation. In cooperation with Guo Yonghuai, the concept of upper and lower critical Mach numbers is introduced into transonic flow for the first time.

Qian Xuesen's research on combining the physical, chemical and mechanical properties of rare gases in 1946 is a pioneering work. 1953, he formally put forward the concept of physical mechanics, which greatly saved manpower and material resources and opened up a new field of high temperature and high pressure. 196 1 year, the Lecture Notes on Physical Mechanics edited by him was officially published. 1984 Qian Xuesen suggested to Gou Qingquan that physical mechanics should be extended to the engineering technology field of atomic and molecular design.

In the process of its formation, engineering cybernetics focuses on the engineering practice of designing stability and guidance systems. Qian Xuesen himself is the pioneer of this kind of research work.

Qian Xuesen studied silently all his life, but no matter when and where he chose, it was not only the highest duty of a scientist, but also the highest mission of a Chinese descendant.

His life experience and achievements have left a dazzling light in the national history of China, the national history of the people of China and the history of the human world, illuminating the way forward. As a pioneer in China's space industry, he is not only a treasure house of knowledge and a banner of science, but also the backbone of the nation and a model for Chinese people all over the world. He showed the world the elegance of the people of China.

References:

Baidu Encyclopedia-Qian Xuesen