Numerical investigation of truncated-root rib on heat transfer performance of internal cooling turbine blades

Dinh, Cong-Τruong; Nguyen, T. M.; Vu, Tai-Duy; Park, S. G.; Nguyen, Quang-Hai

doi:10.1063/5.0054149

Cited by 32 publications

(3 citation statements)

References 47 publications

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“…In addition, Wang et al 23 proposed a wavy rib with a simplified structure designed for the internal cooling channel in turbine blades, with the goal of enhancing heat transfer efficiency while minimizing pressure loss. Dinh et al 24 proposed a truncated-root rib to mitigate squared-rib disadvantages, showing a 39.24% thermal performance (TP) enhancement at Reynolds number 53 697. Recently, Boonloi and Jedsadaratanachai 25 proposed a novel configuration of Vshaped ribs and investigated its impact on the fluid structure and thermal characteristics within a square duct through numerical simulations.…”

Section: Numerical Analysis Of Heat Transfer Characteristics In Ribbe...mentioning

confidence: 99%

Numerical analysis of heat transfer characteristics in ribbed two-passed channel with varied cross section

Li,

Luo,

Yang

et al. 2024

Physics of Fluids

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The mid-chord region of turbine blades typically employs internal cooling channels to enhance heat transfer. However, traditional internal cooling channels are mostly designed in the form of straight channels, and studies based on it may not address the needs of variable cross section channels. Therefore, this study investigates the effect of rib configurations in variable cross section channels on channel performance. First, the cross sectional area of the two-passed channels is modified by altering the inclination angle of the dividers (−3°, 0°, and +3°). The flow pattern and heat transfer features within a two-passed channel with variable cross section under four different rib configurations of NP, NN, PN, and PP are investigated using numerical simulation. N denotes the ribs rotated 45° clockwise relative to the flow direction, while P denotes the ribs rotated 45° counterclockwise. Subsequently, the optimal rib configuration within the variable cross sectional two-passed channels is determined for Reynolds numbers ranging from 10 000 to 50 000. Results show that, at +3°, the PP exhibits the maximum decrease of up to 18.2% in transfer performance factor (TPF), while at −3°, the NN shows the maximum decrease of up to 12.7%. It is evident that the optimal rib configuration for two-passed channels under different divider inclinations is not consistent. At +3°, the NP exhibits the best TPF, while at −3°, the PP demonstrates the optimal TPF. This study provides insights into selecting appropriate rib configurations when the cross sectional area of internal channels within turbine blades varies. Compared to the studies that have focused on traditional straight channels, the research provides guidance for the design of ribbed two-passed channels with varied cross section.

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Section: Numerical Analysis Of Heat Transfer Characteristics In Ribbe...mentioning

confidence: 99%

Numerical analysis of heat transfer characteristics in ribbed two-passed channel with varied cross section

Li,

Luo,

Yang

et al. 2024

Physics of Fluids

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“…It should be noted that in addition to the benefits of using these methods to increase the turbulence transport and heat transfer rate in the stream, there may be some disadvantages such as the pressure drop which is an important parameter [10], because the thrust level of the air breathing propulsion systems directly depends on the pressure drop and increasing the total pressure drop corrupts the engine performance. Different rib configurations are the most effective way for the heat transfer enhancement [11][12], sometimes may be used beside the other techniques [13][14]. It has been illustrated that the high-performance heat transfer improvement can be obtained by using the wavy walls while with lower pressure drops [15][16].…”

Section: Introductionmentioning

confidence: 99%

Using Wavy Fuel Surface to Improve the Performance of the Solid Fuel Ramjets

Reyhani

Tahsini

2022

Propellants Explo Pyrotec

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This paper introduces a new idea to augment the fuel regression rate in solid fuel ramjets. The heat transfer rate from the reacting flow field into the surface of the solid fuel grain determines directly its regression rate in this propulsion system, which is very low in comparison with solid rocket motors leads the low thrust levels. This innovative simple practical method is based on the geometrical treatment of the fuel grain, making the smooth ribs as a wavy surface, to increase the turbulence and the heat transfer rate into the evaporating surface where the fuel flow rate is determined. The finite volume solver of the turbulent reacting compressible flow is developed to study the flow field where the burning rate is computed using the conjugate heat transfer for the solid fuel. The influence of the amplitude and the period of the cosine function as the fuel surface geometry are investigated on the regression rate, and it is shown that the amplitude is more effective, and utilizing such surface treatments helps to augment considerably the fuel average regression rate.

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“…The heat transfer coefficients on the cooling air side are equal; however, the coefficient values on the hot gas side are different. This produces a remarkable temperature difference between the opposite blade sides [10,11].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Method of Heat Transfer Intensification in Radial Channels of Gas Turbine Blades

Osipov

Rogalev

et al. 2022

Inventions

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Loop and semi-loop cooling schemes are widely used for the high-temperature gas turbine blades. In such schemes, the mid-chord airfoil parts are traditionally cooled by radial channels with ribbed walls. The blades with a small specific span, or “short” blades, have different heat flux amounts on pressure and suction sides, which results in a temperature difference in these sides of 100–150 °K. This difference causes thermal stresses and reduces the long-term strength margins. This paper presents a new method of heat transfer intensification in the ribbed radial cooling channels. The method is based on air streams’ injection through holes in the ribs that split channels. The streams are directed along the walls into the stagnation zones behind the ribs. The results of a 3D coolant flow simulation with ANSYS CFX code show the influence of the geometry parameters upon the channel heat transfer asymmetry. In the Reynolds number within a range of 6000–20,000, the method provides the heat transfer augmentation difference by up to 40% on the opposite channel walls. Test results presented in the criteria relations form allow for the calculation of mean the heat transfer coefficient along the channel length.

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Numerical investigation of truncated-root rib on heat transfer performance of internal cooling turbine blades

Cited by 32 publications

References 47 publications

Numerical analysis of heat transfer characteristics in ribbed two-passed channel with varied cross section

Numerical analysis of heat transfer characteristics in ribbed two-passed channel with varied cross section

Using Wavy Fuel Surface to Improve the Performance of the Solid Fuel Ramjets

Asymmetric Method of Heat Transfer Intensification in Radial Channels of Gas Turbine Blades

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