First Experiments and Commissioning of the ORCHID Nozzle Test Section

This paper reports one of the initial NICFD experiments in nozzle test section ORCHID aimed at providing accurate data for validation flow solvers, albeit, this stage research, focus is limited to inviscid phenomena. Notably, a series schlieren photographs displaying Mach waves supersonic dense vapor siloxane MM were obtained and are documented here commissioning experiment, namely, inlet conditions corresponding stagnation temperature pressure $$T_0 = 252~\mathrm {^\circ C}$$ $$P_0 18.4~\mathrm {bara}$$ . At these compressibility factor fluid $$Z_0 0.58$$ The digital processing images allowed estimate multiple angles formed by stemming from upper lower surfaces because infinitesimal density perturbations generated the, albeit small, roughness metal surfaces. These values related local number simple geometric relation. Moreover, total expanded uncertainty was computed. information together with average used first assessment capability evaluating effects occurring organic comparison results CFD simulations. outcome satisfactory. It can thus be inferred that has been commissioned it ready experimental campaigns which its full potential terms measurements accuracy, repeatability, operational flexibility will exploited.