Fugine cycle theory: predicting high efficiency of the supermultijet-convergence engine working from startup to hypersonic scram mode

Naitoh, Ken; Tanaka, Yoshiaki; Tamura, Taro; Nojima, Yoshiyuki; Yamagishi, Kan; Okamoto, Takuma; Sagara, Hiroki; Hashimoto, Taiki; Ikoma, Daiki; Nakai, Takuya; Oyanagi, Susumu; Kanase, Takuto; Ayukawa, Ken; Tsuchiya, Jumpei

doi:10.2514/6.2015-2968

Cited by 11 publications

(2 citation statements)

References 15 publications

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“…2. Figure 22 shows the time-dependent temperature distributions in space for sixteen nozzles, where the maximum temperature is over 500 K. Then, for temperature, the three conversions on Differences A, B, and C depicted above results in the value of maximum temperature over 1,000 K due to the supermulti-jets colliding, which is performed by our previous theoretical and computational evaluations (Naitoh et al, 2015). This level of temperature can bring stable ignition occurrence, even for fuel of gasoline.…”

Section: The Difference Between the Collision Pressures In Figs 2 Anmentioning

confidence: 88%

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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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Section: The Difference Between the Collision Pressures In Figs 2 Anmentioning

confidence: 88%

“…Difference A results in (26/16)×(6/2.2) 2 times increase of the collision pressure of Fig. 19 and more, while Difference B leads to (8.3/5.3) times increase (Naitoh et al, 2015). Then, Difference C will lead to about (1.41) 2 times increase.…”

Section: The Difference Between the Collision Pressures In Figs 2 Anmentioning

confidence: 92%