Computational experiments for improving the performance of Fugine based on supermulti-jets colliding working for a wide range of speeds from startup to hypersonic condition

Tsuru, Kohta; Yamagishi, Kan; Okamoto, Takuma; Tanaka, Yoshiaki; Naitoh, Ken

doi:10.2514/6.2016-4709

Cited by 3 publications

(1 citation statement)

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“…Very high compression can occur, especially when the pulsed jets are injected by suddenly opening the valves. Although traditional diesel and pulse detonation engines employ multi-point autoignition, single-point auto-ignition due to the collision of the supermulti-jets produces less noise because the heat release rate is relatively small and the point of heat release is away from the cylinder walls (Naitoh, 2011(Naitoh, , 2012Naitoh et al, 2016aNaitoh et al, , 2016bNaitoh et al, , 2016cTsuru et al, 2016). (For air-breathing engines, the limited number of nozzles in Fig.…”

Section: Introductionmentioning

confidence: 99%

Unsteady three-dimensional computations and experiments of compression flow formed by collision of supermulti-jets

Tsuru

Konagaya

Kawaguchi

et al. 2018

JTST

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The single-point compression principle, based on the collision of pulsed supermulti-jets, which is proposed in our previous reports, has the potential of obtaining both a high compression ratio and relatively low combustion noise, leading to a lower exhaust gas temperature, i.e., high thermal efficiency for the next generation of engines. The supermulti-jets also enclose high-temperature combustion gas around the chamber center, which means less heat loss to the chamber wall, i.e., higher thermal efficiency due to the air-insulation effect. Here, experimental and computational visualizations around the compression point should be examined in order to confirm the occurrence of single-point compression. Thus, in the present paper, we present experimental Schlieren photographs of flows formed by the collision of supermulti-jets without combustion and the results of unsteady three-dimensional computations conducted with the compressible Navier-Stokes equations, while the Cubic Interpolated pseudo-Particle (CIP) and Combined Unified Procedure (CUP) method is employed as numerical algorithm. Comparison of the experimental and computational results show fairly good agreement in time and space. Schlieren photographs and computational visualizations obtained for various conditions of four-, eight-, and sixteen-nozzles of jets are axial symmetrical, which will indicate the single-point compression based on the collision of supermulti-jets. Computations for asymmetrical distribution of seven nozzles also bring results showing nearly symmetric flow.

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