Afonina, N. E.; Gromov, V. G.; Levin, V. A.; Manuilovich, I. S.; Markov, V. V.; Khmelevskij, A. N. Investigation of the spectral composition of the gas pressure and thrust pulsations in nozzles equipped with a deflector. (English. Russian original) Zbl 1421.76261 Fluid Dyn. 54, No. 3, 414-427 (2019); translation from Izv. Ross. Akad. Nauk, Mekh. Zhidk. Gaza 2019, No. 3, 123-137 (2019). Summary: The results of a numerical and experimental investigation of the thrust and gas pressure pulsations on the thrust wall surface in annular and linear dual slotted nozzles are presented under the laminar flow conditions. The experiments are carried out in a pulsed aerodynamic setup using the products of combustion of acetylene-air mixture as the working body. The calculations are performed on the basis of Navier-Stokes equations for a multicomponent reacting gas medium using a chemically-nonequilibrium thermochemical model. The calculated and measured spectral compositions of the pulsating gas pressure at the center of the thrust wall of the annular nozzle are compared. The dependences of the pressure pulsation frequency and amplitude at the thrust wall center and the thrust on the gas pressures at the nozzle entry and exit, the dimensions of its critical section, and the deflector shape are established. MSC: 76V05 Reaction effects in flows 76M12 Finite volume methods applied to problems in fluid mechanics 76-05 Experimental work for problems pertaining to fluid mechanics Keywords:annular nozzle; linear dual slotted nozzle; Navier-Stokes equations; Fourier spectrum; pressure pulsation; thrust pulsations; dominant frequency; measurement PDFBibTeX XMLCite \textit{N. E. Afonina} et al., Fluid Dyn. 54, No. 3, 414--427 (2019; Zbl 1421.76261); translation from Izv. Ross. Akad. Nauk, Mekh. Zhidk. Gaza 2019, No. 3, 123--137 (2019) Full Text: DOI References: [1] Levin, V. A.; Nechaev, J. N.; Tarasov, A. 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