Li Bei, Liu Yu, Li Jiaqing, Liu Bin, Wang Xingxing, Deng Guanyu
School of Mechanical Engineering, Nantong University, Nantong 226019, China.
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
Materials (Basel). 2022 Jul 14;15(14):4918. doi: 10.3390/ma15144918.
A hydrogen depressurization system is required to supply the hydrogen to the fuel cell stack from the storage. In this study, a Tesla-type depressurization construction is proposed. Parallel Tesla-type channels are integrated with the traditional orifice plate structure. A computational fluid dynamics (CFD) model is applied to simulate high-pressure hydrogen flow through the proposed structure, using a commercial software package, ANSYS-Fluent (version 19.2, ANSYS, Inc. Southpointe, Canonsburg, PA, USA). The Peng-Robinson (PR) equation of state (EoS) is incorporated into the CFD model to provide an accurate thermophysical property estimation. The construction is optimized by the parametric analysis. The results show that the pressure reduction performance is improved greatly without a significant increase in size. The flow impeding effect of the Tesla-type orifice structure is primarily responsible for the pressure reduction improvement. To enhance the flow impeding effect, modifications are introduced to the Tesla-type channel and the pressure reduction performance has been further improved. Compared to a standard orifice plate, the Tesla-type orifice structure can improve the pressure reduction by 237%. Under low inlet mass flow rates, introduction of a secondary Tesla-type orifice construction can achieve better performance of pressure reduction. Additionally, increasing parallel Tesla-type channels can effectively reduce the maximum Mach number. To further improve the pressure reduction performance, a second set of Tesla-type channels can be introduced to form a two-stage Tesla-type orifice structure. The study provides a feasible structure design to achieve high-efficiency hydrogen depressurization in hydrogen fuel cell vehicles (HFCVs).
需要一个氢气减压系统将储存的氢气供应到燃料电池堆。在本研究中，提出了一种特斯拉型减压结构。平行的特斯拉型通道与传统孔板结构相结合。应用计算流体动力学（CFD）模型，使用商业软件包ANSYS-Fluent（版本19.2，ANSYS公司，美国宾夕法尼亚州卡农斯堡南点）来模拟高压氢气通过所提出结构的流动。将彭-罗宾逊（PR）状态方程（EoS）纳入CFD模型，以提供准确的热物理性质估计。通过参数分析对该结构进行优化。结果表明，在尺寸没有显著增加的情况下，减压性能得到了极大提高。特斯拉型孔板结构的节流作用是减压性能提高的主要原因。为了增强节流作用，对特斯拉型通道进行了改进，减压性能进一步提高。与标准孔板相比，特斯拉型孔板结构可将减压率提高237%。在低入口质量流量下，引入二级特斯拉型孔板结构可实现更好的减压性能。此外，增加平行的特斯拉型通道可有效降低最大马赫数。为了进一步提高减压性能，可引入第二组特斯拉型通道以形成两级特斯拉型孔板结构。该研究提供了一种可行的结构设计，以实现氢燃料电池汽车（HFCV）中的高效氢气减压。
