Published 6 issues per year
ISSN Print: 1948-2590
ISSN Online: 1948-2604
NUMERICAL INVESTIGATION ON THE INTERACTION OF A PAIR OF HOT OFF-DESIGN SUPERSONIC JETS WITH A JET BLAST DEFLECTOR
ABSTRACT
The interaction of a pair of hot off-design jets from biconical supersonic nozzles is numerically investigated by the high-resolution RANS/ILES method. The distance between the jet axes is four nozzle exit diameters. To improve the computational accuracy, combined computations of the flows in the nozzles and in the jets escaping from these nozzles are performed. The computations are carried out for free jets with a co-flow and for airfield jets with a jet blast deflector. Distances where mixing layers interaction begins, where jets are merging and where the difference of flow characteristic between one jet and twin jets are observed were obtained. The influence of the pair of jets on the near acoustic field is considered. For airfield jets, the effects of the co-flow velocity and the distance from the nozzle exit to the jet deflector on the size and shape of dangerous areas in terms of temperature, pressure fluctuations, and axial velocity are detected. Generalizing dependencies are presented for evaluating the influence of these parameters on the typical sizes of the dangerous zones. The results of the simulations are compared with similar data for single jet impingement onto the jet deflector. Specific features of the effects of the co-flow velocity and the jet deflector position on pressure, temperature, and their fluctuations over the jet blast deflector height are found.
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Chen Zhenglei, Cai Wantong, Cai Liangcai, Cen Guoping, Wang Haifu, Simulation and Experimental Analysis of the Temperature Field of Jet Flow of Aircraft Based on CFD Theory, IEEE Access, 8, 2020. Crossref
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Chen Zhenglei, Cai Wantong, Cai Liangcai, Cen Guoping, Simulation and Experimental Analysis of the Temperature Field of Flow of Airport Snow Thrower Based on CFD Theory, IOP Conference Series: Earth and Environmental Science, 525, 1, 2020. Crossref