Aerothermodynamik German by Oertel, Herbert

By Oertel, Herbert

Dieses Buch wendet sich an Studenten der Ingenieurwissenschaften und Ingenieure der Raumfahrtindustrie und der Energieverfahrenstechnik. Es verkn?pft die klassischen Gebiete der Aerodynamik mit der Nichtgleichgewichts-Thermodynamik hei?er Gase. Am Beispiel des Wiedereintritts einer Raumkapsel in die Erdatmosph?re werden die aerothermodynamischen Grundlagen und numerischen Methoden zur Berechnung des Str?mungsfeldes der Raumkapsel im gaskinetischen und kontinuumsmechanischen Bereich der Wiedereintrittstrajektorie behandelt. Am Beispiel von Raumfahrtprojekten werden die Methoden entwickelt. Die Autoren sind anerkannte Spezialisten f?r dieses Fachgebiet.

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K I . 15 K for any gas at a sul~ticienilylow prcswrt. 020 attn. 010 alm. rhc,dlines). 2 A plot of experinlcnpl values of PF P for H,(g, tclrj\cc\). 15 K. atrn as P + O (ideal behavior). 2 'I'he values of the molar gas constant R in variuur unit?. bar,mol-l . K-' 2-2. The van der Waals Equation and the Rcdlich-Kwong Equation Are Examples of Two-Parameter Equations clf Stdtc The idral-gas equation is valid for all gasc5 at sufficiently low pressures. 3. torand is denoted hy Z . Notc that % = I under all co~ldiiionsfur an ideal gas.

Or plcacurt' units. 1 Of the three quantities, volurne. prcssure, and tcmperature, ternpcr;~turei s the most difficult to cunceptualize. We will present a molecular i~~rcrpretaliorl of ternprature later, but here we will give an operational definition. 1. Specifically, wc detine T to he ' where A is the babe area nf the colunln, p is the dcnsity of the fluid, and h is thc hcr~lli ut- the ctllumn. '. s '. 2. because all gaqes behave ideally ill the limit u l P + 0. Tile unit of temperature is the kelvin, which is dcnoted K .

F~~rrtsivr q u o ~ ~ r i r i ror . ~exrri~sive , vririr:blrs, are directly proportional to the size of a system. V r > l u ~ ~mass. ~ c . and energy are exilmples of extensive quantities. r, or. v, do not depend upon thc si7c of the system. If we dikidt anextensivequantity hy thc riur~~hcr ot p;~rticlcsor ihe ~~urnhcrnf nloles iri a system, we obtain all intcnsive quantity. mol ' ) is an intcnsive quatitlty. Dislinguishinp htwtlen 11ic p r o l s r t i c ~of e x t c ~ ~ s i and r ~ e intenqive rluanlities is often irnportarlt i ti desc~-ihi~lg cf~emicalsysiems.

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