A New High-Efficiency Heavy-Duty Combustion Turbine 701F

Fukue, I.; Aoki, S.; Aoyama, K.; Umemura, S.; Merola, Andrew A.; Noceto, M.; Rosso, M.J.

doi:10.1115/1.2906832

Cited by 2 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At very high redshift, the cosmic background radiation could also provide an irradiative source (e.g. Fukue & Umemura 1994; Mineshige, Tsuribe, & Umemura 1998), although far more modest in temperature. For fast-spinning holes, a notable portion of emitted radiation from accretion disks is expected to fall back on the disks as well (Cunningham 1976).…”

Section: Radiating and Scattering Away Angular Momentummentioning

confidence: 99%

Liberation of Specific Angular Momentum Through Radiation and Scattering in Relativistic Black-Hole Accretion Disks

Stevens

2015

Publ. Astron. Soc. Aust.

View full text Add to dashboard Cite

A key component of explaining the array of galaxies observed in the Universe is the feedback of active galactic nuclei, each powered by a massive black hole's accretion disk. For accretion to occur, angular momentum must be lost by that which is accreted. Electromagnetic radiation must offer some respite in this regard, the contribution for which is quantified in this paper, using solely general relativity, under the thin-disk regime. Herein, I calculate extremised situations where photons are entirely responsible for energy removal in the disk and then extend and relate this to the standard relativistic accretion disk outlined by Novikov & Thorne, which includes internal angular-momentum transport. While there is potential for the contribution of angular-momentum removal from photons to be 1% out to ∼10 4 Schwarzschild radii if the disk is irradiated and maximally liberated of angular momentum through inverse Compton scattering, it is more likely of order 10 2 Schwarzschild radii if thermal emission from the disk itself is stronger. The effect of radiation/scattering is stronger near the horizons of fast-spinning black holes, but, ultimately, other mechanisms must drive angular-momentum liberation/transport in accretion disks.

show abstract

Section: Radiating and Scattering Away Angular Momentummentioning

confidence: 99%

Liberation of Specific Angular Momentum Through Radiation and Scattering in Relativistic Black-Hole Accretion Disks

Stevens

2015

Publ. Astron. Soc. Aust.

View full text Add to dashboard Cite

show abstract

A Method for Minimizing the Tightening Force Variation in a Single Center Tied Rotor that Occurs during Operation of a Large Gas Turbine

Kim¹,

Han²

2020

KSPE

View full text Add to dashboard Cite

EthosEnergy has developed a rotor solutions program to introduce to the marketplace. Integrity of rotor assembly is very critical for safe and reliable operation of a gas turbine. Rotor components have finite design life and consequently, planned maintenance involving inspection and replacement of life limiting components is critical for reliable operation. Rotor reliability issues can cause unit unavailability, increased maintenance costs and forced outages. Recently, OEM has released a technical information letter (TIL) to inform customers of end of life of rotor and consequence of rotor failure, if prescribed maintenances are not performed. To address rotor end of life issues, some independent service providers may offer inspections during a planned maintenance and rotor life time extension. Rotor life time interval extension needs to be based on engineering assessment of operating stresses/temperature, understanding of material failure modes, advanced NDE inspection techniques, OEM know-how, etc., which many of these independent service providers may not have. As a result, fidelity of a life time extension recommendation provided by an independent service provider should be carefully evaluated relative to risk associated with consequence of a rotor failure. Contrary to many other service providers including OEM, EthosEnergy has adopted a different approach by offering a cost-effective rotor solution. Using state-of-the-art engineering tools and advanced manufacturing techniques, EthosEnergy has designed replacement compressor and turbine wheels for frame 6 and frame 7 gas turbines. EthosEnergy wheels are interchangeable with OEM components and can be tailored to accept in-kind or improved blade root profile. EthosEnergy solution is to replace life limiting components of a rotor and thereby minimize overall project cost for a typical user. EthosEnergy rotor exchange program has been developed to reduce our customers risk profile at a cost substantially below a complete replacement of an OEM rotor. Details of EthosEnergy rotor solution will be discussed in this paper.

show abstract

A New High-Efficiency Heavy-Duty Combustion Turbine 701F

Cited by 2 publications

References 4 publications

Liberation of Specific Angular Momentum Through Radiation and Scattering in Relativistic Black-Hole Accretion Disks

Liberation of Specific Angular Momentum Through Radiation and Scattering in Relativistic Black-Hole Accretion Disks

A Method for Minimizing the Tightening Force Variation in a Single Center Tied Rotor that Occurs during Operation of a Large Gas Turbine

Contact Info

Product

Resources

About