Minimization of entropy generation of a closed Brayton cycle based precooling-compression system for advanced hypersonic airbreathing engine

Yu, Xuanfei; Wang, Cong; Yu, Daren

doi:10.1016/j.enconman.2020.112548

Cited by 24 publications

(5 citation statements)

References 37 publications

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“…The main challenges facing aviation engines are high mission costs, long transportation times, and the need for safer abort modes. [10] In this context, the pursuit of high-efficiency and low-pollution engines has become a mainstream trend. Therefore, the LACE [11] was proposed and widely used.…”

Section: Liquid Air Cycle Engines (Lace)mentioning

confidence: 99%

Analysis of the social impact of heat engine and its future application

Yang

Guo

2022

IOP Conf. Ser.: Earth Environ. Sci.

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This paper aims to evaluate the social impact of the heat engine and analyze the application of heat engines in the future. This paper starts with some background information on heat engines and the challenges of gas pollution and gas shortage. The concepts of efficiency and environmental friendliness of the heat engine are widely discussed, which speeds up the development of several kinds of heat engines. We discuss the application of heat engines in different industries from three main aspects: agriculture, marine engine, and aviation. They improve our daily life and provide the required energy to the community. Thermoacoustic Heat Engine (TAHE), Liquid Air Cycle Engines (LACE), and a new class of Heat engine without the expulsion of reaction mass are introduced in this paper. Furthermore, the article will cover some futures. One is artificial intelligence, and another one is about biofuel, which helps heat engines to have higher efficiency and less pollution, and also how heat engines are involved in the next decade.

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Section: Liquid Air Cycle Engines (Lace)mentioning

confidence: 99%

Analysis of the social impact of heat engine and its future application

Yang

Guo

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…For the heat regeneration technique which is always called as regenerative cooling, the heating wall are cooled by the fuelcoolant and the heat is transported by the fuel to the propulsion system and converted into flight kinetic energy. The regenerative cooling is widely used in TM processes of scramjet, 6 combined 7 and pre-cooled 8 type engines. For the heat conversion technique, if thermoelectric generators (TEGs) are integrated into the TPS, part of the aerodynamic heat will be converted into electric energy and part of the onboard power system could be replaced, thus the structure efficiency could be improved and the inner space could be saved.…”

Section: Introductionmentioning

confidence: 99%

Effects of physical dimensions, temperature ranges and interfacial thermal contacts on the multi‐stage thermoelectric generators for a hypersonic vehicle

Gou

Yan

et al. 2022

Intl J of Energy Research

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Summary The conversion and utilization of aerodynamic heat is one of the most promising thermal management techniques for hypersonic vehicles. In this paper, one‐, two‐ and three‐stage thermoelectric generators (TEGs) are designed and the effects of physical dimensions, temperature ranges and interfacial thermal contacts are studied for a hypersonic cruise vehicle. First, the geometric parameters of TEGs are optimized, and the optimal physical dimensions under different temperature ranges are obtained in consideration of both power supply and weight increment. Second, the effects of interfacial thermal contacts between TE and electrode materials are studied considering the contacting pressure, temperature and gap medium by two‐scale simulations, the thermal contact resistance in micro roughness‐scale and the TE performance of TEGs in meso layer‐scale. Finally, the TEG is considered as a multi‐functional thermal protection structure, and its power generation capacity and weight increment cost are evaluated for a typical hypersonic cruise vehicle. The results show that for different temperature ranges there exist optimal physical dimensions, and greater contact pressure and stronger thermal conduction property of gap medium result into better performance of TEGs.

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“…This will increase the system calculation complexity and decrease the physical interpretability of the system control equations, which is detrimental to system modeling and optimization. Based on the problems above, several algorithm‐focused modeling optimization methods have been proposed and widely used, such as the whale optimization algorithm, 26 differential evolution algorithms, 30 genetic algorithms, 33 LINMAP decision‐making methods, 35 artificial neural networks, and particle swarm optimization 36 . It takes a long time to compute due to the nonlinearity of the expression and the need for iterative calculation.…”

Section: Introductionmentioning

confidence: 99%

“…29 characterized the degradation of a temperature-only system according to the Degradation-Entropy Generation methodology and observed that degradation was linearly related to heat storage and transfer entropy generation. Yu et al 30 modeled and designed each component in the precooling-compression system and then minimized the total entropy production of the system. They concluded that the regenerator and precooler had the greatest irreversibility and that the decrease in entropy generation would inevitably increase the heat exchanger cost.…”

Section: Introductionmentioning

confidence: 99%

Matrixed modeling method and entropy generation minimization analysis of heat supply system based on standard thermal resistance

Liang

Hao

et al. 2022

Energy Science & Engineering

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Complex implicit expressions and many intermediate parameters are not conducive to the application of entropy generation optimization to the performance of thermal and energy systems from component and system perspectives. In this paper, we derived matrix heat transport equations of three primary heat exchanger networks according to the heat current method. Based on the matrix equations, we established the matrixed model of a typical heat supply system and obtained the corresponding matrix equation reflecting the power topology structure of the system. Moreover, we derived and reconstructed a single heat exchanger's entropy generation rate expression based on the standard thermal resistance, which was only related to inlet temperatures, structural parameters, and operating parameters. The total system entropy generation rate was then derived and minimized by the Lagrange multiplier method. The optimization results provided the optimal distribution of the mass flow rate of each fluid. Besides, the influence of the heat transfer rate and outer loop inlet temperature on the optimization results revealed that local equipment parameters and conditions could affect the system's minimum entropy generation. The total entropy generation rate decreases by 17.5% when the outer loop inlet temperature was increased from 274 to 280 K. In conclusion, the matrixed modeling and entropy generation analysis are feasible for thermal system modeling and optimization.

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Minimization of entropy generation of a closed Brayton cycle based precooling-compression system for advanced hypersonic airbreathing engine

Cited by 24 publications

References 37 publications

Analysis of the social impact of heat engine and its future application

Analysis of the social impact of heat engine and its future application

Effects of physical dimensions, temperature ranges and interfacial thermal contacts on the multi‐stage thermoelectric generators for a hypersonic vehicle

Matrixed modeling method and entropy generation minimization analysis of heat supply system based on standard thermal resistance

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