Numerical analyses of heat transfer and thermal stress in a ZrB2 gas turbine stator blade

Moghanlou, Farhad Sadegh; Vajdi, Mohammad; Motallebzadeh, Amir; Sha, Jianjun; Shokouhimehr, Mohammadreza; Asl, Mehdi Shahedi

doi:10.1016/j.ceramint.2019.05.344

Cited by 85 publications

(18 citation statements)

References 74 publications

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“…Composite materials based on transitional metal diboride and silicon carbide (MeB2-SiC) possess an exceptional high-temperature stability in air and are known as ultra-high temperature ceramics (UHTC). UHTCs are used for scramjet engines, leading edges and nose-cones of hypersonic vehicles, heat exchangers, and advanced rocket motors [1,2,3,4,5,6]. However, their high hardness and stiffness is also linked to a poor toughness and thermal shock resistance, which reduces the material performance in most high-temperature applications [7,8].…”

Section: Introductionmentioning

confidence: 99%

Reactive sintering of TiB2-SiC-CNT ceramics

Popov

Zhang

Huseynov³

et al. 2019

Ceramics International

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TiB2-SiC ceramics with multi-wall carbon nanotubes (MW-CNT) were reactively hot pressed at 1800°C and 30 MPa. Carbon nanotubes survived the process and could be clearly observed in the sintered ceramics. The in-situ exothermic reactions between TiC, B4C and Si accelerated the densification and produced nonporous TiB2-SiC ultrahigh-temperature ceramics within one minute at 1800 °C. Although the toughness of the ceramic was not significantly affected by the CNT addition, remaining around 6 MPa•m 1/2 , the CNT presence resulted in a substantial improvement in TiB2-SiC thermal shock resistance. The Vickers hardness decreased from 27GPa for the CNT-free matrix to 21GPa for ceramic with maximum CNT content (7.4 wt.%).

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Section: Introductionmentioning

confidence: 99%

Reactive sintering of TiB2-SiC-CNT ceramics

Popov

Zhang

Huseynov³

et al. 2019

Ceramics International

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“…1) and absorbed, while other surfaces of the receiver cool down the whole body by radiation and convection mechanisms. ZrB 2 as a UHTC is used for receiver material because of its high melting point and acceptable thermal conductivity [59]. The radiation emissivity for the material has assumed to be 0.8.…”

Section: Model Definition and The Geometrymentioning

confidence: 99%

Numerical investigation of solar collectors as a potential source for sintering of ZrB2

et al. 2021

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Sintering of ceramics is an energy-consuming process that needs high temperatures, therefore, in the present work; solar energy is used to produce high temperatures for the sintering aim of different materials. Solar energy concentrators increase the intensity of incident energy to the receiver provides high temperatures. Ultrahigh-temperature ceramics (UHTCs) due to their high melting point can also be a good alternative for receiver materials. In the present work, ZrB2 is introduced as an alternative material for solar receivers which can withstand high temperatures of sintering. The governing equations, including heat radiation and conduction ones are solved numerically using the finite element method. Transient heat transfer in the concentrator-collector system is investigated to check the feasibility of high temperatures needs for sintering at the receiver. The highest temperature of 1680 °C was achieved after 15 minutes at the focal point of the concentrator when the solar heat flux of 6.86 w/mm2 used for the location of the city of Ardabil in Iran. The obtained temperature can be used to sintering of some groups of materials.

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“…In industries, the component with holes was widely employed for various purposes, such as turbine blades, 18,19) diesel engine, 20) and furnace wall construction. 21) However, the stress concentration that often occurs at the corner of the hole determines the failure of the components.…”

Section: Geometrymentioning

confidence: 99%

Numerical Investigations on Thermomechanical Behaviour of Purging Plug with Rectangular and Circular Slits

Tan

Jin

et al. 2021

ISIJ Int.

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Purging plugs are widely used in the secondary refining process, and its service life determines the downtime and usage efficiency of the whole ladle. This study focuses on comparing the heat transfer and thermomechanical behaviour of purging plug with different slits to obtain the reason for the long service life of purging plug by thermal-structure coupling method. The numerical results showed that the moderation of temperature distribution is achieved by changing the slit shape and the reasonable arrangement of the circular slits. Furthermore, the circular slits can alleviate the stress concentration phenomena, and circular slits are better for decreasing the axial stress in the purging plug, which occurred at the position located 0.323 m above the bottom face, and its distance from the centre is 0.04 m.

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Numerical analyses of heat transfer and thermal stress in a ZrB2 gas turbine stator blade

Cited by 85 publications

References 74 publications

Reactive sintering of TiB2-SiC-CNT ceramics

Reactive sintering of TiB2-SiC-CNT ceramics

Numerical investigation of solar collectors as a potential source for sintering of ZrB2

Numerical Investigations on Thermomechanical Behaviour of Purging Plug with Rectangular and Circular Slits

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