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Selected Achievements and Discoveries Made in High-Enthalpy Flow Facilities

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One path to scientific discovery is that a theoretical argument leads to a clear question that can be answered only by experiment. An experiment is a question asked of nature. If the question is asked in such a way that nature is able to answer it with a whole page, it is like the answer of a politician from which one is often left wondering what he said. The experiment therefore has to be formulated in such a way that nature is forced to say yes or no . Of course, to be able to formulate the question in this manner, one has to know a good deal about the subject. So, in order to acquire such pre-knowledge, it is necessary to perform exploratory experiments which nowadays can often conveniently be performed numerically that serve to roam through the parameter space. Another path is that, through physical exploratory experiments, phenomena are discovered that were previously not suspected, and that become explained theoretically only after their discovery. One variant of this path is that wrong ideas prevail over a considerable time, and only through persistent rubbing of the researcher s nose in the evidence can nature succeed in his final enlightenment. In the following pages examples of both paths leading to new results will be presented. The word new in this context should be understood as new at the time because I will be presenting discoveries dating back to the 1970 s. Since nearly all the major groups working in our field are represented at this lecture series, the contents will concentrate on the work of the groups with which I have been working. Even from those the space and time limitations of this lecture make it necessary to omit a large number, including the work of Jean Paul Davis on shock boundary layer interaction, the extensive work of Joe Olejniczak on the sensitive double cone flow, the detailed study of Ivett Leyva on shock detachment from a cone and the development of force measurement and two body hypersonic flow by Stuart Laurence. Sim

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  • Fluid Mechanics
  • Thermodynamics

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