Resistance of marine gas turbine nozzle vanes to thermal cycling in a gas stream containing sea-water salts

Tret'yachenko, G. N.; Kravchuk, L.; Konev, V. A.; Kuriat, R. I.

doi:10.1007/bf01529660

Cited by 1 publication

(2 citation statements)

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“…near the leading edge. The density of a NiAl alloy is 5.86 g/cm 3 , about 30% less dense than a nickel alloy, 8.65g/cm 3 . This suggests a beneficial effect in terms of weight reduction.…”

Section: Numerical Resultsmentioning

confidence: 91%

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The benefit of high-conductivity materials in film cooled turbine nozzles

Montomoli

Massini

Yang

et al. 2012

International Journal of Heat and Fluid Flow

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This study presents an experimental and numerical investigation of the beneficial effect of higher conductivity materials in HP turbine nozzles. Most of the literature studies focus on the maximum temperature that a nozzle can withstand, whereas the effect of thermal gradients is often neglected. However thermal gradients have higher influence on the life of the components and they have to be given careful consideration. In this work it is shown that thermal gradients are reduced by using high conductivity materials and, as a consequence, the nozzles life is appreciably increased.A representative film cooled leading edge with an internal impingement plate was studied experimentally at Texas AM University. Two materials were used, namely polycarbonate and stainless steel, in order to highlight the impact of conduction on coolant effectiveness. Numerically conjugate heat transfer simulations have been carried out with an in house solver to analyse in detail the impact of conduction and internal convection. Both experimental and numerical results show that by increasing the conductivity in the solid region, the thermal gradients are strongly reduced. Numerically it is shown that using inserts of nickel-aluminide alloys in nozzles may reduce the thermal gradients from 3 to 4 times if compared to nowadays design.

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“…near the leading edge. The density of a NiAl alloy is 5.86 g/cm 3 , about 30% less dense than a nickel alloy, 8.65g/cm 3 . This suggests a beneficial effect in terms of weight reduction.…”

Section: Numerical Resultsmentioning

confidence: 91%

“…One of the first papers identifying a possible solution for controlling the high thermal gradients in nozzles was written by Tret'yachenko et al [3]. Working on marine propulsion applications; the authors were looking for a method to improve the life of nozzles with salty air.…”

Section: Introductionmentioning

confidence: 99%