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Träfflista för sökning "WFRF:(Cheng Ching Yu) ;hsvcat:2"

Sökning: WFRF:(Cheng Ching Yu) > Teknik

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1.
  • Lu, R.S., et al. (författare)
  • A ring-like accretion structure in M87 connecting its black hole and jet
  • 2023
  • Ingår i: Nature. - 0028-0836 .- 1476-4687. ; 616:7958, s. 686-690
  • Tidskriftsartikel (refereegranskat)abstract
    • The nearby radio galaxy M87 is a prime target for studying black hole accretion and jet formation1,2. Event Horizon Telescope observations of M87 in 2017, at a wavelength of 1.3 mm, revealed a ring-like structure, which was interpreted as gravitationally lensed emission around a central black hole3. Here we report images of M87 obtained in 2018, at a wavelength of 3.5 mm, showing that the compact radio core is spatially resolved. High-resolution imaging shows a ring-like structure of [Formula: see text] Schwarzschild radii in diameter, approximately 50% larger than that seen at 1.3 mm. The outer edge at 3.5 mm is also larger than that at 1.3 mm. This larger and thicker ring indicates a substantial contribution from the accretion flow with absorption effects, in addition to the gravitationally lensed ring-like emission. The images show that the edge-brightened jet connects to the accretion flow of the black hole. Close to the black hole, the emission profile of the jet-launching region is wider than the expected profile of a black-hole-driven jet, suggesting the possible presence of a wind associated with the accretion flow.
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2.
  • Joy, Jesline, et al. (författare)
  • Numerical Investigation of NOx Emission Reduction in Non-Premixed Lean Reverse-Flow Combustor in a Micro Gas Turbine Engine
  • 2020
  • Ingår i: Emission Control Science and Technology. - : Springer. - 2199-3629 .- 2199-3637. ; 6:2, s. 285-300
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper details a NOx emissions characteristics study of a reverse-flow combustor using the steady Reynolds averaged Navier-Stokes (RANS) methodology. The combustor considered in this paper is the SR-30 engine model. The aim of this work is to understand the pollutant formation characteristics within the combustor chamber volume across various combustor zones. Effective ways to counter such high emissions by means of flow dilution were also investigated in the present study. Results indicated that the baseline reverse-low combustor model showed high NOx emission characteristics in the primary and secondary zones due to uneven temperature distribution. The emissions can be reduced effectively with additional dilution holes at the dilution zone of the reverse-flow combustor. The flow split due to the newly designed holes caused the velocity components (axial, radial and tangential), turbulence kinetic energy and the temperature within the primary and secondary zone to reduce significantly. The recovery of flow in the dilution zone with further reduction in temperature reduced the overall NOx emission significantly.
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