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Equivalent study on delethalization test for sled head injury criteria test of civil aircraft passenger seat

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Equivalent study on delethalization test for sled head injur...

CSAA/IET International Conference on Aircraft Utility Systems 2020, AUS 2020

作者： Jin, Zhi-Sheng Shen, Wen-Bo Luo, Guo-Xiong Li, Ming Jia, Zhi-Xiao Zhou, Wu Jia, Luo Zhang, Le Aviation Key Laboratory of Science and Technology on Life-Support Technology Xiang yang China Test Department AVIC Aerospace Life-Support Industries Ltd No.29 Xinhua road Xiang yang China Science and Technology Development Department AVIC Aerospace Life-Support Industries Ltd No.29 Xinhua road Xiang yang China

ISBN: (纸本)9781839535635

The equivalent study between delethalization test and sled HIC test is in order to improve the efficiency of Head Injury Criteria (HIC) test on civil aircraft passenger seats, as well as to reduce the test consumption and cost. The equivalent impact model was established based on the equal rotatory kinetic energy, then the test of equal energy impact was designed and the delethalization test was carried out. The results of delethalization test and sled HIC test show that all the deviation value of HIC, peak head center of gravity (CG) acceleration in X direction, peak head CG resultant acceleration and the deformation of the seat back (C/B) was within ± 20%. In conclusion, the equivalent impact model in this paper is suitable, and the delethalization test be used as an equivalent method for sled HIC test is feasible. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Kinetics

Lightweighting Strategies for Optimized Thermal Energy Storage: Topology Optimization of Heat Exchanger Fins

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SSRN 2024年

作者： Wu, Chongtian Yuan, Xiaolu Yuan, Nenglin Li, Yonghao Kong, Benben Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

This study introduces topology optimization (TO) to enhance the efficiency of thermal energy storage systems (TESS) by optimizing fins, addressing the low thermal conductivity of phase change materials (PCM). Fins are simplified to a "Y+T" configuration based on TO results, improving TESS performance. Additionally, the paper first incorporates the mass(m) factor into TESS optimization, emphasizing its significance in the design process. Divided into two steps for efficiency, the optimization process explores nine fin scenarios, favoring distribution optimization over increasing fin numbers. The optimal model, with three branches and θ=90°, reduces melting time and enhances efficiency compared to finless TESS. A lightweight design approach adjusts root length and width ratio, achieving efficiency gains and reducing melting time. This study introduces the mass factor and provides a rational fin configuration through TO and optimization. Named "TO Typical Structure Extraction+Parameter Sensitivity Analysis + Entropy Weighted-TOPSIS Multi-Objective Optimization," it elucidates thermal storage mechanisms, facilitating rapid optimization and offering insights for TESS fin optimization and lightweight design. © 2024, The Authors. All rights reserved.

关键词： Heat storage

An Innovative Hybrid Air-Cooled and Liquid-Cooled System for Condensation Prevention

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SSRN 2024年

作者： Zhang, Bixiao Yuan, Nenglin Kong, Benben Zou, Yitao Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

Addressing the issue of condensation susceptibility in lithium battery thermal management systems operating in high-humidity environments, this paper proposes an innovative hybrid air and liquid cooling system. This system incorporates a specially designed return air structure to enhance the thermal stability and safety of the batteries. Computational fluid dynamics (CFD) simulations were utilized to analyze the thermal management performance under varying airflow velocities and temperature conditions, leading to the optimization of the return air structure to mitigate condensation. The research findings reveal that the proposed hybrid system reduces the condensation area by approximately 39.68% at an airflow velocity of 0.5 m/s compared to traditional liquid cooling systems. Furthermore, the introduction of flow deflectors significantly improves the anti-condensation effect in high-humidity environments, achieving the objective of dew-free operation throughout the entire area. Lastly, employing the entropy weight-TOPSIS method and nonlinear surface fitting, a comprehensive evaluation of multiple schemes was conducted regarding heat dissipation, anti-condensation measures, and energy consumption. It was determined that when Vair = 1.29 m/s and Vwater = 0.22 m/s, the thermal management system of the battery module exhibits optimal comprehensive performance, with corresponding values of T, Tmax, Enair, and Enwater being 3.98 K, 302.36 K, 0.15806 J, and 0.19203 J. The outcomes of this paper not only enhance the thermal management efficiency of lithium-ion batteries in high-humidity environments but also offer practical solutions for electric vehicles and other fields requiring efficient thermal management, demonstrating significant engineering application value. © 2024, The Authors. All rights reserved.

关键词： Condensation

Simulation of Hybrid Air-Cooled and Liquid-Cooled Systems for Optimal Lithium-Ion Battery Performance and Condensation Prevention in High-Humidity Environments

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SSRN 2024年

作者： Zhang, Bixiao Yuan, Nenglin Kong, Benben Zou, Yitao Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft environment control and life support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

This study introduces an innovative hybrid air-cooled and liquid-cooled system designed to mitigate condensation in lithium-ion battery thermal management systems (BTMS) operating in high-humidity environments. The proposed system features a unique return air structure that enhances the thermal stability and safety of the batteries by recirculating air through the battery box, thereby utilizing residual heat to prevent condensation. Computational Fluid Dynamics (CFD) simulations were employed to analyze and optimize the system's thermal management performance under various airflow velocities and temperature conditions. The study results show that compared to traditional liquid cooling systems, the proposed hybrid system reduces the condensation area by approximately 39.68% at a wind speed of 0.5 m/s, and the temperature difference decreases by 0.35 K. The integration of flow deflectors further improves the anti-condensation effect, achieving a phase change rate greater than 0 in the cooling area, thereby enabling condensation-free operation throughout the entire cooling zone. A comprehensive evaluation using the entropy weight-TOPSIS method and nonlinear surface fitting was conducted to assess multiple schemes regarding heat dissipation, anti-condensation measures, and energy consumption. The optimal operating conditions were identified as an airflow velocity (Vair) of 1.29 m/s and a liquid flow velocity (Vwater) of 0.22 m/s, resulting in a maximum temperature difference (ΔT) of 3.98 K, a maximum temperature (Tmax) of 302.36 K, and energy consumption values (Enair and Enwater) of 0.158 J and 0.192 J, respectively. The proposed system not only addresses the thermal management challenges of lithium-ion batteries in high humidity environments, but also effectively ensures the insulation safety of electronic components. It provides a reliable solution for electric vehicles and other high-efficiency thermal management applications, demonstrating significant engineering a

关键词： Cooling systems

Simulation of Hybrid Air-Cooled and Liquid-Cooled Systems for Optimal Lithium-Ion Battery Performance and Condensation Prevention in High-Humidity Environments

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SSRN 2024年

作者： Zhang, Bixiao Yuan, Nenglin Kong, Benben Zou, Yitao Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft environment control and life support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

关键词： Cooling systems

An Innovative Hybrid Air-Cooled and Liquid-Cooled System for Condensation Prevention

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SSRN 2024年

作者： Zhang, Bixiao Yuan, Nenglin Kong, Benben Zou, Yitao Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft environment control and life support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

Addressing the issue of condensation susceptibility in lithium battery thermal management systems operating in high-humidity environments, this paper proposes an innovative hybrid air and liquid cooling system. This system incorporates a specially designed return air structure to enhance the thermal stability and safety of the batteries. Computational fluid dynamics (CFD) simulations were utilized to analyze the thermal management performance under varying airflow velocities and temperature conditions, leading to the optimization of the return air structure to mitigate condensation. The research findings reveal that the proposed hybrid system reduces the condensation area by approximately 39.68% at an airflow velocity of 0.5 m/s compared to traditional liquid cooling systems. Furthermore, the introduction of flow deflectors significantly improves the anti-condensation effect in high-humidity environments, achieving the objective of dew-free operation throughout the entire area. Lastly, employing the entropy weight-TOPSIS method and nonlinear surface fitting, a comprehensive evaluation of multiple schemes was conducted regarding heat dissipation, anti-condensation measures, and energy consumption. It was determined that when Vair = 1.29 m/s and Vwater = 0.22 m/s, the thermal management system of the battery module exhibits optimal comprehensive performance, with corresponding values of ∆T, Tmax, Enair, and Enwater being 3.98 K, 302.36 K, 0.15806 J, and 0.19203 J. The outcomes of this paper not only enhance the thermal management efficiency of lithium-ion batteries in high-humidity environments but also offer practical solutions for electric vehicles and other fields requiring efficient thermal management, demonstrating significant engineering application value. © 2024, The Authors. All rights reserved.

关键词： Condensation

An Innovative Hybrid Air-Cooled and Liquid-Cooled System for Condensation Prevention

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SSRN 2024年

作者： Zhang, Bixiao Yuan, Nenglin Kong, Benben Zou, Yitao Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft environment control and life support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

This study introduces an innovative hybrid air-cooled and liquid-cooled system designed to mitigate condensation in lithium-ion battery thermal management systems (BTMS) operating in high-humidity environments. The proposed system features a unique return air structure that enhances the thermal stability and safety of the batteries by recirculating air through the battery box, thereby utilizing residual heat to prevent condensation. Computational Fluid Dynamics (CFD) simulations were employed to analyze and optimize the system's thermal management performance under various airflow velocities and temperature conditions. The research findings indicate that the hybrid system significantly reduces the condensation area by approximately 39.68% at an airflow velocity of 0.5 m/s compared to traditional liquid cooling systems. The integration of flow deflectors further improves the anti-condensation effect, achieving dew-free operation across the entire cooling area. A comprehensive evaluation using the entropy weight-TOPSIS method and nonlinear surface fitting was conducted to assess multiple schemes regarding heat dissipation, anti-condensation measures, and energy consumption. The optimal operating conditions were identified as an airflow velocity (Vair) of 1.29 m/s and a liquid flow velocity (Vwater) of 0.22 m/s, resulting in a maximum temperature difference (ΔT) of 3.98 K, a maximum temperature (Tmax) of 302.36 K, and energy consumption values (Enair and Enwater) of 0.15806 J and 0.19203 J, *** outcomes of this research not only enhance the thermal management efficiency of lithium-ion batteries in high-humidity conditions but also provide practical solutions for electric vehicles and other applications requiring efficient thermal management, demonstrating significant engineering application value. The proposed system addresses the critical challenge of condensation in BTMS, offering a robust and energy-efficient solution that could significantly improve th

关键词： Condensation

Innovative Compact Thermal Management for High-Density Lithium-Ion Batteries: A Hybrid Cooling Solution

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SSRN 2024年

作者： Yuan, Xiaolu Zheng, Rentong Yang, Jiaming Kong, Benben Shi, Hong College of Energy & Power Engineering Jiangsu University of Science and Technology 2 Mengxi Jingkou Zhenjiang212003 China Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics 29 Yudao Street Nanjing210016 China

Efficient heat dissipation technology for high heat flux density in compact energy storage battery packs is crucial for future development and currently represents a major bottleneck in technological advancement. To address this issue, this study proposes an innovative thermal management strategy: a compact hybrid air-cooling and liquid-cooling system designed to optimize the thermal efficiency of lithium-ion battery modules. The research methodology included the development of a physical model for the battery thermal management system (BTMS), complemented by experimental validation and grid independence checks to ensure the precision of the simulation outcomes. A controlled variable technique was applied to thoroughly examine the effects of five pivotal parameters on BTMS efficacy: the height of the liquid cooling tubes, the angle of contact between the tubes and the batteries, the velocity of the cooling liquid at the inlet, and the temperature of the cooling water. To simplify the analytical process and enable swift optimization, the study innovatively incorporated orthogonal experimental design, genetic aggregation, and the rank sum ratio (RSR) method, thereby circumventing the need for extensive CFD predictive computations. The optimal system configuration, as determined by these techniques, realized a peak surface temperature of 26.6 °C, a temperature gradient of 3.5 °C, a total energy expenditure of 52486 J, and a system mass of 0.099 kg under specific conditions: a 0 mm elevation difference between the cooling tubes and batteries, a 60° contact angle, a cooling liquid flow rate of 0.93 m/s, and a cooling water temperature of 22.5 °C. The results of this study confirm that the proposed hybrid cooling system markedly improves the thermal performance of lithium-ion battery modules, providing a practical solution for high-power applications. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

Analysis of pollutant concentration in aircraft cabin under MCT single engine drift descent status

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Analysis of pollutant concentration in aircraft cabin under ...

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2024)

作者： Qianlong Ding Xizhong Jian Haiming Shen Guangya Zhu Dalin Zhang Weijian Chen Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics & Astronautics Nanjing People's Republic of China Shanghai Aircraft Design and Research Institute of COMAC Shanghai People's Republic of China College of Flight Technology Civil Aviation University of China Tianjin People's Republic of China

ISBN: (数字)9781837242108

Concentration distribution of air pollutants in commercial aircraft cabins are important for providing passengers and crew wi th a healthy and comfortable environment. To verify whether the concentration of air pollutants meets airworthiness standards, this article focuses on the cabin of a specific aircraft and employs numerical simulation to analyze the CO 2 concentration distribution during single-engine drift. The MCT single-engine drift calculations reveal that pollutants initially increase and then decrease as the aircraft descends from 7620m to the emergency ventilation altitude, the concentrations of pollutants in the x section, y section and z section increasing by 66.87%, 55.61%, and 61.08% respectively, maintaining pollutant concentrations within acceptable limits throughout the drift.

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