Effect of vane/blade relative position on heat transfer characteristics in a stationary turbine blade: Part 1. Tip and shroud

Rhee, Dong-Ho; Cho, Hyung Hee

doi:10.1016/j.ijthermalsci.2007.12.006

Cited by 36 publications

(9 citation statements)

References 46 publications

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“…Han et al [14] measured the heat transfer on a blade surface to investigate the effect of an unsteady wake. Rhee and Cho [16,17] measured heat/mass transfer coefficient on the blade, tip, and shroud surfaces for various relative positions between the stator and rotor. These studies showed that the heat transfer increased as increasing the wake frequency and that an unsteady wake promoted earlier and broader boundary layer transition.…”

Section: Introductionmentioning

confidence: 99%

Effects of Unsteady Wake on Heat Transfer of Endwall Surface in Linear Cascade

Park

Jung

Lee

et al. 2014

Journal of Heat Transfer

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The present study aimed to investigate the effect of an unsteady wake on the heat transfer for the endwall surface of a linear of cascade turbine Made. A naphthalene sublimation method was implemented to obtain the detailed heatlmass transfer distributions on the endwall surface. Tests were conducted on a five-passage linear cascade in a low-speed wind tunnel. The effects of unsteady wakes were simulated in the facility by a wake generator consisting of circular rods that were traversed across the inlet flow. The test conditions were fixed at a Reynolds number of 70,000 based on the inlet velocity and chord length. The flow coefficients were varied from 1.3 to 4.2 and the range of Strouhal number was 0.1-0.3. The results showed that the heat transfer distributions differed betv\>een steady and unsteady cases. The overall heat transfer for the unsteady cases was higher, and the heat transfer was enhanced with increasing the Strouhal number due to the resulting thin boundary layer and high turbulence intensity. Therefore, a cooling system for the endwall of a rotor should focus on reducing the high temperatures on the endwall suiface induced by the unsteady wakes.

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Section: Introductionmentioning

confidence: 99%

Effects of Unsteady Wake on Heat Transfer of Endwall Surface in Linear Cascade

Park

Jung

Lee

et al. 2014

Journal of Heat Transfer

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“…The systems designs which incorporate such wind conditions and have ability to increase flow velocity in the rotor zone [10][11][12][13][14] were being suggested for the built environment. In this connection the literature prefers the use of wind turbine enclosures with wind accelerating characteristics [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Savonius Wind Turbine in the Solar Integrated Rotor House

Manganhar¹,

Rajpar²,

Samo³

2017

Mehran Univ. res. j. eng. technol.

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Rooftop, building integrated and building augmented micro wind systems have the potential for small scale power generation in the built environment. Nevertheless, the expansion of micro wind technology is very slow and its market is strongly affected by the low efficiency of conventional wind generators. WAG-RH (Wind Accelerating and Guiding Rotor House) which is a new technique introduced to enhance the efficiency of vertical axis rotor. The present study utilizes other green energy element by integrating the WAG-RH with a solar heating system. In this effort roof of the WAG-RH has been utilized to heat air through micro solar chimney for creating buoyancy effect in the air flow channel at rotor zone in the WAG-RH. The integration is capable of improving the performance of rotor setup in the WAG-RH as well as providing hot air with sufficient air mass flow rate for space heating. The WAG-RH had brought about 138% increase in the performance coefficient(Cp) of conventional three bladed Savonius rotor, whereas solar integrated WAG-RH has contributed 162% increase in the Cp of the same rotor.

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“…Several researchers have examined the benefits and economics of placing a diffuser around a wind turbine [14,15]. It has been reported that the speed of wind passing through the shroud is dramatically increased [16,17]. Shrouding (diffuser augmented) horizontal axis wind turbine has been shown to be an effective way to potentially improve the performance of wind turbine for applications in built or urban environments [9,10].…”

Section: Introductionmentioning

confidence: 99%