Key issues and cooling performance comparison of different closed Brayton cycle based cooling systems for scramjet

Miao, Heyang; Wang, Zhongwei; Niu, Yaobin

doi:10.1016/j.applthermaleng.2020.115751

Cited by 35 publications

(9 citation statements)

References 30 publications

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“…Meanwhile, due to the dramatic variable density (Pierre Carles, 2010), the efficiency of TECS tends to be higher when the supercritical CO2 is used (Miao et al, 2019). Miao et al (2019Miao et al ( , 2020 proposed the supercritical CO2 TECS applied on the aircraft. The heat exchange process of working fluid in heated channel is one of the most important part in the supercritical CO2 thermoelectric conversion system.…”

Section: Introductionmentioning

confidence: 99%

The influence of working pressure on the heat transfer process and heat absorption of supercritical CO2 in thermoelectric conversion system

Yang¹,

Wang²,

Niu³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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The influence of working pressure, which is one of the most important parameters in the design of thermoelectric conversion system, on the heat transfer process and heat absorption of supercritical CO2 in the square heated duct is numerically studied. Under the calculated cases, two main vortices with opposite flow direction are formed at the inlet of the heated section. Accordingly, due to the effect of two main vortices, the local heat transfer coefficient profiles on bottom and up wall are M shaped. Meanwhile, it is founded that one wall temperature peak is presented near the inlet of heated duct. With the increase of working pressure, the wall temperature peak decreases gradually. For the safety of the system, it is better to choose 15 MPa as the working pressure due to the relatively low wall temperature peak and pressure. To evaluate the heat absorbed by working fluid, the one-dimensional steady heat transfer model is built. It is found that the absorbed heat changes non-monotonically and the maximum, namely 1080.11 W, is reached under 10 MPa. From the point of heat absorption, it is better to choose 10 MPa as working pressure.

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Section: Introductionmentioning

confidence: 99%

The influence of working pressure on the heat transfer process and heat absorption of supercritical CO2 in thermoelectric conversion system

Yang¹,

Wang²,

Niu³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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“…The closed Brayton cycle based on supercritical carbon dioxide (SCO 2 ) utilizes SCO 2 to exchange the high-temperature heat from the scramjet. This cycle avoids the direct heat exchange between the scramjet and fuel, which is easy to coke, and blocks the cooling channels when the incomplete pyrolysis reaction occurs [11][12][13]. Compared with hydrocarbon fuel, SCO 2 is more reliable and stable [6].…”

Section: Introductionmentioning

confidence: 99%

“…They found that the former utilizes more cooling capacity of fuel. Miao et al [12] compared the performance of three typical closed Brayton cycle layouts, namely simple, recuperated and SCO 2 cycles. They proposed an improved scheme of the SCO 2 cycle with lower cooling fuel consumption.…”

Section: Introductionmentioning

confidence: 99%

“…PCHE is a high-temperature heat exchanger that exchanges the heat from SCO 2 to fuel. Because the physical properties of SCO 2 and fuel vary greatly with temperature and pressure [12], it is necessary to adopt the segmental (SEG) method. It divides PCHE into several sub-heat exchangers, and then the detailed temperature of each sub-heat exchanger can be calculated [24].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of Power and Thermal Management System of Hypersonic Vehicle with Finite Heat Sink of Fuel

et al. 2022

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The scramjet of hypersonic vehicles faces severe high-temperature challenges, but the heat sink available for scramjet cooling is extremely finite. It is necessary to optimize its power and thermal management system (PTMS) with a finite heat sink of hydrocarbon fuel. This paper proposes a two-level optimization method for the PTMS of hypersonic vehicles at Mach 6. The PTMS is based on a supercritical carbon dioxide (SCO2) closed Brayton cycle, and its heat sink is airborne hydrocarbon fuel. System-level optimization aims to obtain the optimal system parameters for the PTMS. The minimum fuel weight penalty and the minimum heat sink consumption of fuel are the optimization objectives. The segmental (SEG) method is used to analyze the internal temperature distribution of fuel–SCO2 heat exchangers in the system-level optimal solution set. This ensures the selected optimal solutions meet the requirement of a pinch temperature difference greater than or equal to 10 °C. Further, the component-level optimization for the fuel–SCO2 heat exchanger is carried out based on the selected optimal solutions. The lightest weight of the heat exchanger and the minimum entropy production are the optimization objectives in this step. Finally, the optimal system parameters and the optimal key component parameters can be searched using this presented two-level optimization method.

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“…In order to increase the efficiency, closed cycle power plants are modified [28]. The parameters of the working medium are optimized [29] and regenerators [30] and intercoolers [31] can sometimes be applied.…”

Section: Introductionmentioning

confidence: 99%

Design Analysis of Micro Gas Turbines in Closed Cycles

Kosowski

Piwowarski

2020

Energies

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The problems faced by designers of micro-turbines are connected with a very small volume flow rate of working media which leads to small blade heights and a high rotor speed. In the case of gas turbines this limitation can be overcome by the application of a closed cycle with very low pressure at the compressor inlet (lower than atmospheric pressure). In this way we may apply a micro gas turbine unit of accepted efficiency to work in a similar range of temperatures and the same pressure ratios, but in the range of smaller pressure values and smaller mass flow rate. Thus, we can obtain a gas turbine of a very small output but of the efficiency typical of gas turbines with a much higher power. In this paper, the results of the thermodynamic calculations of the turbine cycles are discussed and the designed gas turbine flow parts are presented. Suggestions of the design solutions of micro gas turbines for different values of power output are proposed. This new approach to gas turbine arrangement makes it possible to build a gas turbine unit of a very small output and a high efficiency. The calculations of cycle and gas turbine design were performed for different cycle parameters and different working media (air, nitrogen, hydrogen, helium, xenon and carbon dioxide).

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Key issues and cooling performance comparison of different closed Brayton cycle based cooling systems for scramjet

Cited by 35 publications

References 30 publications

The influence of working pressure on the heat transfer process and heat absorption of supercritical CO2 in thermoelectric conversion system

The influence of working pressure on the heat transfer process and heat absorption of supercritical CO2 in thermoelectric conversion system

Optimization of Power and Thermal Management System of Hypersonic Vehicle with Finite Heat Sink of Fuel

Design Analysis of Micro Gas Turbines in Closed Cycles

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