Comparative performance of combined gas turbine systems under three different blade cooling schemes

Najjar, Yousef S.H.; AL-Ghamdi, Abdullah S. AL-Malaise; Albeirutty, Mohammed

doi:10.1016/j.applthermaleng.2003.12.002

Cited by 39 publications

(37 citation statements)

References 8 publications

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“…With the above treatment, the core samples could be used for the etching experiment. The volume density and the apparent porosity of the as-prepared samples were 2.58 g/cm 3 and 16.1%, respectively. During the removal process, the ceramic core samples were immerged into the etchant KOH solution.…”

Section: Methodsmentioning

confidence: 88%

“…Al(OH) 3 is insoluble in solution and then deposits on the core surface. The reason for the production of Al(OH) 3 is that the solubility of KCl in water is affected by the presence of KOH in the alkaline solution. When the KOH solution concentration is 70 wt %, the maximum dissolved amount of KCl is 10 wt % in mass percentage of KOH.…”

Section: ¹1mentioning

confidence: 99%

“…11. It is found that aluminum hydroxide [Al(OH) 3 ] exists in the core surface film in addition to the alumina and the reaction product KAlO 2 . Al(OH) 3 is insoluble in solution and then deposits on the core surface.…”

Section: ¹1mentioning

confidence: 99%

“…18) If KCl exceeds this ratio, it will be suspended in the alkali solution hindering contact between the core and the alkali solution. Alumina cannot react in a timely manner with the alkali solution and directly undergoes a hydration reaction that finally leads to the formation of Al(OH) 3 adhering to the surface of the core, which suddenly decreases the de-coring rate. Therefore, 10 wt % KCl added to the KOH alkali solution benefits the de-coring process, and the de-coring rate increases to 8.32 wt % h ¹1 .…”

Section: ¹1mentioning

confidence: 99%

“…The basic reaction equation is Li 3 AlF 6 + 2Al 2 O 3 = 3LiAlO 2 + 2AlF 3 . However, it expands more to include waste purification, since the F ¹1 ion has severe harmful effects on the human body and the environment.…”

Section: )mentioning

confidence: 99%

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Basis for the alkaline removal process design of the alumina-based ceramic core

Zhang

et al. 2017

J. Ceram. Soc. Japan

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The basic physico-chemical behaviors and laws of etching an alumina-based ceramic core out of investment castings still puzzle the process designer. To investigate the basis, ceramic removal experiments were performed at normal pressure by varying several main factors. The de-coring rate increased as the etching temperature increased. A higher alkali concentration was beneficial to the removal efficiency but had an upper limit because of the metal alkaline corrosion. The de-coring rate underwent a convex-curve variation as the etching time increased since the deposition of a validated insoluble product gradually hinders the etching reaction. The solute additive KCl and solvent additive ethanol have the positive effects of improving the reactivity of the base solution and increasing the permeability of the etching liquid, respectively. The de-coring rate was up to 10.46 wt %·h ¹1 in a steady process with etching in a 70 wt % KOH solution supplemented with 10 wt % KCl and ethanol.

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Section: Methodsmentioning

confidence: 88%

Section: ¹1mentioning

confidence: 99%

Section: ¹1mentioning

confidence: 99%

Section: ¹1mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

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