Numerical experiment on the flow field properties of a blunted body with a counterflowing jet in supersonic flows. (June 2018)

• Record Type: Journal Article
• Authors: Huang, Wei; Zhang, Rui-Rui; Yan, Li; Ou, Min; Moradi, R.
• Is Part Of: Acta astronautica. Volume 147(2018)
• Page Start: 231
• Page End: 240
• Publication Date: 2018-06
• Subjects: Counterflowing jet -- Drag reduction -- Heat flux reduction -- Supersonic flow -- Blunted body; Astronautics -- Periodicals; Outer space -- Exploration -- Periodicals; Astronautics; Periodicals; 629.405
• DOI: 10.1016/j.actaastro.2018.04.018
• Languages: English
• ISSNs: 0094-5765

Abstract

Abstract: The prediction of the drag and heat flux reduction characteristics is a very important issue in the conceptual design phase of the hypersonic vehicle. In this paper, the flow field properties around a blunted body with a counterflowing jet in the supersonic flow with the freestream Mach number being 3.98 were investigated numerically, and they are obtained by means of the two-dimensional axisymmetric Reynolds-averaged Navier-Stokes (RANS) equations coupled with the two equation standard k-ε turbulence model. The surface Stanton number distributions, as well as the surface static pressures, were extracted from the flow field structures in order to evaluate the drag and heat flux reduction characteristics. Further, the influences of the jet pressure ratio and the jet Mach number on the drag and heat flux reduction were analyzed based on the detailed code validation and grid independency analysis process. The obtained results show that the flow cell Reynolds number has a great impact on the heat flux prediction, and its best value is 5.0 for the case studied in the current study. However, the flow cell Reynolds number and the grid scale both have only a slight impact on the prediction of the surface static pressure distribution, as well as the turbulence model. The larger jet pressure ratio is beneficial for the drag and heat flux reduction, and the smaller jet Mach number is beneficial for the heat flux reduction. Further, the long penetration mode is beneficial for the drag reduction, but it is not beneficial for the heat flux reduction. Highlights: Influences of jet pressure ratio and jet Mach number on drag and heat reduction were investigated. Flow cell Reynolds number has a great impact on the heat flux prediction. Larger jet pressure ratio is beneficial for drag and heat flux reduction. Flow mode transition occurs with the increase of the jet Mach number. Long penetration mode is beneficial for drag reduction, but is not beneficial for heat reduction.