*Hypersonic Vehicles - Applications, Recent Advances, and Perspectives*


#### **Table 3.**

*N3 (Mach 4–8 Pa) operating conditions.*


### **Table 4.**

*N4 (Mach 4–71 Pa) operating conditions.*

and is in fact a state parameter. Other correlation parameters must be taken into account for rarefied high velocity flows as indicators of when the Knudsen number is not a flow parameter for supersonic flows in the sense that Mach number and Reynolds number are flow parameters. To account for viscous effects due to rarefaction and high velocity flow, the similarity number *<sup>ψ</sup>* <sup>¼</sup> *<sup>M</sup>*ffiffiffiffiffi *Re* <sup>p</sup> , called the viscous parameter is a better candidate where the Reynolds number reflects the dynamical similarity of the flows around a model and the full-scale object [40–42]. It is important to note that in this investigation the wall temperature of the waverider remains "cold", with *Twall* ¼ *T*0.

**Table 5** sumarizes the values for the Knudsen number, the Reynods number, and the viscous parameter for each of the nozzles used for this investigation.


**Table 5.**

*Nondimensional parameters for each one of the nozzles (based on L = 10 cm).*

*Experimental Analysis of Waverider Lift-to-Drag Ratio Measurements in Rarefied… DOI: http://dx.doi.org/10.5772/intechopen.100328*
