Calculation of the Boundary-Layer Growth in a Ludwieg Tube

Abstract

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Iteration schemes for rapid post‐stall aerodynamic prediction of wings using a decambering approach

“…For several decades, researchers have sought to extend these linear prediction methods to handle the aerodynamic analysis of wings in which nonlinear airfoil lift curves extending to stall or post‐stall are used as inputs . The motivation is that it is significantly easier to obtain aerodynamic characteristics for airfoils than for wings and configurations, whether by using CFD or experiment or by drawing on existing databases.…”

A workflow for designing contoured axisymmetric nozzles for enhancing additively manufactured cold spray deposits

“…This is achieved by adapting compressible flow design methods originally developed for transonic and supersonic wind tunnel nozzles. The design of the cold spray nozzle is obtained by using the CONTUR code by Sivells [32] in conjunction with the code developed by Alcenius and Schneider [33]. This approach aims at ensuring that the design nozzle pressure ratio, which is the ratio of the nozzle inlet design total pressure to the nozzle exit static pressure, is achieved and that the flow is more shock-free than with a conical cold spray nozzle.…”

“…The single ASCII output text file provides the nozzle profile as a points list and other information. Sivells [32] provides guidance for specifying the input parameters, on the algorithm of the main program and of its 16 subroutines and describes the output. Further guidance on the use of CONTUR is provided in Shope [35].…”

Refurbishment and Testing Techniques in a Transonic Ludwieg Tunnel

“…A 1/13 th scale model of this facility was built and characterized at the Arnold Engineering Development Center. 14,15 At the NASA Marshall Space Flight Center, construction of a larger transonic Ludwieg tunnel was completed in 1969. 16 A 32 inch, circular test section was connected to a 378 foot charge tube that could be pressurized to 700 psig and provided the highest unit Reynolds number of any western country at the time.…”