page_title: MARHy Wind Tunnel
section_title: Technical details
hierarchical_section_title: MARHy Wind Tunnel / Technical details
caption_attribution_description: English: Scheme of the MARHy wind tunnel.
context_page_description: The MARHy Hypersonic low density Wind Tunnel, located at the ICARE Laboratory in Orléans, France, is a research facility used extensively for fundamental and applied research of fluid dynamic phenomena in rarefied compressible flows. Its name is an acronym for Mach Adaptable Rarefied Hypersonic and the wind tunnel is recorded under this name under the European portal MERIL.
  The facility was completed in 1963 and is one of the three facilities belonging to the FAST platform and used in the aim of supporting aeronautics and aerospace research.
context_section_description: MARHy is a unique facility in Europe delivering low pressure, super/hypersonic flow in a continuous mode. It is an open-jet wind tunnel.
  Dimensions: The wind tunnel is composed of 3 parts:
  a settling chamber: length of 2.6 m, internal diameter of 1.2 m. It is equipped with a flow breaking cone.
  a cylindrical test chamber: length of 3.5 m, diameter of 2 m.
  a diffusor going to the pumping room: length of 10m and diameter of 1.4 m.
  Regarding the flow conditions and the rarefaction level, two types of pumping groups are available. 19 different types of flows can be generated, requiring specific generating conditions and thus, relying on variable vacuum pressures. Indeed, for high densities flows, 14 Roots blowers are associated to 2 rotary vacuum pumps.
  A wide range of nozzles with various exits shapes going from cylindrical to a truncated cone with an interchangeable col allows an operating domain from subsonic to hypersonic.  When a diffusor is added in the extension of the test chamber, a static pressure below 1 micrometer of mercury can be reached.
caption: Scheme of the wind tunnel MARHy.
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