Editing Centrifugal compressor (section)

=== Physical-mechanical domain ===
[[File:PhysTurboDomain.PNG|thumb|upright= 1.35|Figure 2.2 – Physical domain of turbomachinery]]
Figure 2.2 (shown right) represents the physical or mechanical domain of turbomachinery. Again, the horizontal axis represents the energy equation with turbines generating power to the left and compressors absorbing power to the right.<ref name="Shepherd"/><ref name="Wislicenus"/> Within the physical domain the vertical axis differentiates between high speeds and low speeds depending upon the turbomachinery application.<ref name="Shepherd"/><ref name="Wislicenus"/> The Z-axis differentiates between axial-flow geometry and radial-flow geometry within the physical domain of turbomachinery.<ref name="Shepherd"/><ref name="Wislicenus"/> It is implied that mixed-flow turbomachinery lie between axial and radial.<ref name="Shepherd"/><ref name="Wislicenus"/> Key contributors of technical achievements that pushed the practical application of turbomachinery forward include:<ref name="wood"/><ref name="streeter"/> [[Denis Papin]],<ref name="98-GT-22 International Gas Turbine & Aeroengine Congress & Exhibition in Stockholm, Sweden.">{{cite web|last=Engeda|first=Abraham|title=From the Crystal Palace to the pump room|url=http://www.memagazine.org/backissues/membersonly/february99/features/crystal/crystal.html|work=Mechanical Engineering|publisher=ASME|year=1999 |archiveurl=https://web.archive.org/web/20090115221252/http://www.memagazine.org/backissues/membersonly/february99/features/crystal/crystal.html|archivedate=2009-01-15}}</ref> Kernelien Le Demour, [[Daniel Gabriel Fahrenheit]],  John Smeaton, Dr. A. C. E. Rateau,<ref>{{cite web|last=Elliott Company|title=Past, Present, Future, 1910-2010|url=http://www.elliott-turbo.com/Files/Admin/100th%20Anniversary/1930s%20-%20O%20Line%20Blowers.pdf|publisher=Elliott|accessdate=1 May 2011}}</ref> [[John Barber (engineer)|John Barber]], [[Alexander Sablukov]], Sir [[Charles Algernon Parsons]], [[Ægidius Elling]], [[Sanford Alexander Moss]], [[Willis Carrier]], [[Adolf Busemann]], [[Hermann Schlichting]], [[Frank Whittle]] and [[Hans von Ohain]].