An alternative architecture of the Humphrey cycle and the effect of fuel type on its efficiency

Stathopoulos, Panagiotis

doi:10.1002/ese3.776

Cited by 15 publications

(7 citation statements)

References 49 publications

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“…For the later stages of the turbine, the coolant can be bled from the primary compressor. Also, for the whole cycle simulation [8], Layout 2 showed better performance than Layout 1.…”

Section: Cycle Layoutmentioning

confidence: 92%

“…The film cooling effectiveness, ϵ f , cooling efficiency η c and the cooling flow factor, K, can be taken as constants as shown in Table 2. The constant values are taken from [8,17].…”

Section: D Blade Cooling Methodologymentioning

confidence: 99%

“…This higher mass flow rate at the exit indicates that the full coolant mass flow is utilized and there is no presence of bleed blockage for Layout 2. Also, for the whole cycle simulation [8], Layout 2 shows better performance than Layout 1. In this section, the cooling of all four blade rows is evaluated using Layout 2.…”

Section: Layout Comparisonmentioning

confidence: 95%

“…Across the world, several studies have been conducted for combining PGC with both PDC [4,5] and RDC [6,7] to the existing gas turbine cycles. Stathopoulos [8] also conducted a cycle analysis with PGC for thermodynamic and performance calculations. The practical use of PGC concept does, however, have technical challenges.…”

Section: Introductionmentioning

confidence: 99%

“…It is needed for the bleed blockage effect, that is, the coolant enters the domain when the pressure of the cooling air is higher than the pressure of the main flow at the corresponding region. The bleed blockage condition is given by Equation (8).…”

mentioning

confidence: 99%

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Film Cooling Modeling in a Turbine Working under the Unsteady Exhaust Flow of Pulsed Detonation Combustion

Varatharajulu Purgunan,

Asli,

Nacci

et al. 2024

Energies

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Pressure gain combustors (PGCs) have demonstrated significant advantages over conventional combustors in gas turbine engines by increasing the thermal efficiency and reducing the pollution emission level. PGCs use shock waves to transfer energy which contributes to the increase in outlet total pressure. One of the major obstacles in the actual implementation of PGCs in the gas turbine cycle is the exploitation of the highly unsteady flow of the combustor outlet with the downstream turbine. Because of the higher outlet temperature from the PGCs, the turbine blade cooling becomes essential. Due to the highly fluctuating unsteady flow of PGCs, 3D CFD simulation of turbines becomes very expensive. In this work, an alternative approach of using a 1D unsteady Euler model for the turbine is proposed. One of the novel aspects of this paper is to implement the turbine blade cooling in the unsteady 1D Euler model. The main parameters required for the turbine blade cooling are the cooling air mass flow rate, temperature, and pressure. Due to the introduction of coolant flow, the blades are no longer adiabatic and the mass flow rate across the turbine is not constant. Comparing the 1D Euler results against zero-dimensional calculation and 3D CFD approach showed a very good match for both steady and unsteady simulations confirming the applicability of the 1D method.

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“…For the later stages of the turbine, the coolant can be bled from the primary compressor. Also, for the whole cycle simulation [8], Layout 2 showed better performance than Layout 1.…”

Section: Cycle Layoutmentioning

confidence: 92%

“…The film cooling effectiveness, ϵ f , cooling efficiency η c and the cooling flow factor, K, can be taken as constants as shown in Table 2. The constant values are taken from [8,17].…”

Section: D Blade Cooling Methodologymentioning

confidence: 99%

Section: Layout Comparisonmentioning

confidence: 95%