Abstract

TOLENTINO-MASGO, San Luis B et al. Numerical analysis of the flow behavior in the throat section of an experimental conical nozzle. Enfoque UTE [online]. 2021, vol.12, n.1, pp.12-28. ISSN 1390-6542.  https://doi.org/10.29019/enfoqueute.676.

The flow pattern in supersonic nozzles is defined by the aerodynamic profiles of the geometry of the internal walls, among other parameters, the throat being a critical section. In the present work, the objective is to analyze the behavior of the flow in the straight section of the throat of an experimental conical nozzle of a solid fuel probe rocket engine. The over-expanded flow was simulated with the ANSYS-Fluent code in a 2D computational domain, using the RANS model and the Menter turbulence model, and the Sutherland equation for viscosity as a function of the temperature. Five case studies were performed for the throat length in the range of 1-10 mm. Fluctuations of Mach number, pressure and temperature, oblique shock waves in the throat section were obtained for the length of 10 mm; for shorter lengths the intensity of the shock magnitude decreased. It is concluded that, for the throat length of 1 mm, the flow is transonic without the presence of oblique shocks. In the diverging section, shock waves vary in intensity and change position.

Keywords : Oblique shock; fluctuation; throat length; conical nozzle; simulation.

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