Optimization of Heat Exchangers for Intercooled Recuperated Aero Engines

Misirlis, Dimitrios; Vlahostergios, Zinon; Flouros, Michael; Salpingidou, Christina; Donnerhack, Stefan; Goulas, A.; Yakinthos, K.

doi:10.3390/aerospace4010014

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…Hence, the pressure drop from the fins and its effect on the flow is modelled through an inertial resistance factor 𝜆 in the HEX domain (see Fig. 7), similar to other existing heat exchanger studies [19][20][21][22]. This factor acts in the direction of the fins, accounting for the streamwise pressure drop in the HEX as formulated in Eq (4), using the total pressure drop from Eq.…”

Section: Fig 7 -Location Of Hex Domain Inlet and Outletmentioning

confidence: 99%

Compact Heat Exchangers With Curved Fins for Hydrogen Turbofan Intercooling

Patrao,

Jonsson,

Xisto

2024

Journal of Engineering for Gas Turbines and Power

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Hydrogen is being considered as a possible path towards carbon-neutral aviation. There are additional advantages besides its main benefit of CO2-free combustion. One application is to use it for aero engine heat management due to its cryogenic temperature and high heat capacity, including intercooling and exhaust heat recuperation. The focus of this paper is on the design of a compact heat exchanger integrated into an intermediate compressor duct (ICD), which could decrease compression work and specific fuel consumption (SFC). This compact heat exchanger features curved fins to promote flow turning and decrease pressure losses compared to more conventional straight fin heat exchangers. Conceptual design and duct shape optimization has been carried out which produced integrated ICD heat exchanger designs with significantly lower air-side total pressure losses compared to their conventional straight fin counterparts, which could improve system level integration and engine performance. A direct outcome of this study is a pressure loss correlation which can be used in future engine system level trade studies.

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Section: Fig 7 -Location Of Hex Domain Inlet and Outletmentioning

confidence: 99%

Compact Heat Exchangers With Curved Fins for Hydrogen Turbofan Intercooling

Patrao,

Jonsson,

Xisto

2024

Journal of Engineering for Gas Turbines and Power

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“…In papers [9,10], a simplification of CPD models using a porous medium was applied to study the distribution of heat flow and evaluate the efficiency of heat transfer in aircraft equipment and intercooled recuperated aero engines. The described numerical tool is based on an advanced porosity model approach where the heat exchanger core is modeled as a porous media of predefined heat transfer and pressure loss behavior.…”

Section: Heat Exchanger With Sbrcmentioning

confidence: 99%

CFD Modeling of Heat Exchanger with Small Bent Radius Coils Using Porous Media Model

Dmitriev

Kurkin

Dobrov

et al. 2023

Fluids

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The efficiency of heat transfer in air-cooled heat exchangers of various industrial facilities depends on the flow rate of the coolant, its inlet temperature and ambient temperature. These parameters are transient and depend both on the features of the technological process and on weather conditions. One option for a compact design of heat exchangers is the use of close-packed coils with a small bending radius. In this case, heat transfer in the complex geometry of the annular space cannot be described by simple one-dimensional dependencies. To solve this problem, it is necessary to consider the three-dimensional spatial structure of the heat exchange surface. Since the size of the grid elements will be several orders of magnitude less than the size of the facility, the size of the computational grids for CFD modeling full-scale heat exchangers will be billions of finite volumes, and even on powerful supercomputers, the solution time will be about a month. One way to reduce computational costs is to use reduced order models, in which the computational domain is not modeled directly; instead, simplified models, such as a porous medium model, are used to describe it. However, such models require additional closing relations and coefficients that characterize the actual channel geometry. This paper presents a technique for creating a digital twin of a heat exchanger with small bend radius coils based on a porous medium model. The values of heat transfer coefficients and hydraulic resistance depend on the speed of air movement in the space between the coils. The calculated value of the thermal power obtained using the strengthened model was 529 kW, which corresponds to the passport data of 500 kW, with less than 6% deviation for the heat exchanger under study. This confirms the correctness of the calculation with accepted simplifications. The calculation time in this case was only a few minutes when using a personal computer. The developed numerical model allows for the resolution of performance characteristics based on the temperature of the cooled medium at the inlet, air temperature, and fan speed. Analyzing the different modes of turning on the cooling fans made it possible to determine the values of the thermal power when turning off the fans or reducing the number of revolutions.

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“…For the latter concept, ultracompact, high temperature resistant air-air HEX components have been developed and demonstrated for aero-engine integration [46,47]. Further advanced HEX configurations have been conceptually elaborated for an improved integration in the nozzle section of aircraft engines [48,49] as well as for secondary fluid recuperation based on multifluid HEXs [50]. In parallel, light-weight compact HEX designs for an application as compressor intercoolers have been developed [51,52] in order to increase the achievable fuel optimum cycle pressure ratios.…”

Section: Advanced Heat Exchangers For Aeronautical Applicationmentioning

confidence: 99%

Initial Assessment of a Fuel Cell—Gas Turbine Hybrid Propulsion Concept

et al. 2022

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A fuel cell—gas turbine hybrid propulsion concept is introduced and initially assessed. The concept uses the water mass flow produced by a hydrogen fuel cell in order to improve the efficiency and power output of the gas turbine engine through burner steam injection. Therefore, the fuel cell product water is conditioned through a process of condensation, pressurization and re-vaporization. The vaporization uses the waste heat of the gas turbine exhaust. The functional principles of the system concept are introduced and discussed, and appropriate methodology for an initial concept evaluation is formulated. Essential technology fields are surveyed in brief. The impact of burner steam injection on gas turbine efficiency and sizing is parametrically modelled. Simplified parametric models of the fuel cell system and key components of the water treatment process are presented. Fuel cell stack efficiency and specific power levels are methodically derived from latest experimental studies at the laboratory scale. The overall concept is assessed for a liquid hydrogen fueled short-/medium range aircraft application. Block fuel savings of up to 7.1% are found for an optimum design case based on solid oxide fuel cell technology. The optimum design features a gas turbine water-to-air ratio of 6.1% in cruise and 62% reduced high-level NOx emissions.

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Optimization of Heat Exchangers for Intercooled Recuperated Aero Engines

Cited by 12 publications

References 14 publications

Compact Heat Exchangers With Curved Fins for Hydrogen Turbofan Intercooling

Compact Heat Exchangers With Curved Fins for Hydrogen Turbofan Intercooling

CFD Modeling of Heat Exchanger with Small Bent Radius Coils Using Porous Media Model

Initial Assessment of a Fuel Cell—Gas Turbine Hybrid Propulsion Concept

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