| 摘要: |
| 随着人们环境保护意识的加强，天然工质制冷剂重新受到研究人员的关注。空气是一种安全且对环境绝对友好的天然制冷剂，未来，压缩空气制冷循环有望成为传统蒸气压缩制冷循环的潜在替代品。压缩膨胀机作为压缩空气制冷的核心部件，其工作效率对机组性能有直接影响。为了设计出能够配合膨胀机高效工作的离心压缩机，需要对传统的设计方法进行一些修正。本文将质量、动量、能量守恒与射流尾迹区理论相结合，并将传统的离心压缩机相关参数推广到较低压力的范围中，提出了一种与现有的涡轮膨胀机相匹配的离心压缩机几何参数的设计方法。使用该方法为现有的膨胀机设计了对应的离心压缩机，并利用其他学者分析过的离心压缩机模型对该方法进行验证，利用计算流体力学方法(CFD)对压缩膨胀机变工况下的工作性能及对膨胀功的利用率进行模拟分析。按本方法设计的离心压缩机在设计工况下能够以高于92%的效率利用膨胀机的输出功。在变工况条件下能够以高于88%的效率利用膨胀机的输出功，并且在设计质量流量附近能够顺利运行。 |
| 关键词: 空气压缩制冷 压缩膨胀机 离心压缩机设计 膨胀功利用率 |
| DOI： |
| 投稿时间：2022-10-19 修订日期：2023-03-06
录用日期：2023-04-17 |
| 基金项目:北京工业大学“城市碳中和”科技创新基金(049000514122607)和北京工业大学环境与生命学部培育基金(PY202105)资助。 |
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| Design and Performance Analysis of a Turbine Expander-Compressor |
|
Tian Yu, Ma Guoyuan, Liu Shuailing, Xu Shuxue, Zhou Feng
|
| (Faculty of Environment and Life, Beijing University of Technology) |
| Abstract: |
| With increasing environmental awareness, natural refrigerants have regained prominence. An air-cycle refrigeration system is an effective alternative because air is harmless and environmentally friendly. The expander-compressor system is the core component of an air-cycle refrigeration system, where the compressor input power varies with the expander performance curve. To design a centrifugal compressor that can operate efficiently with an expander, modifications to traditional design methods are required. By combining the conservation of mass, momentum, and energy with the jet wake flow pattern and extending the relevant parameters of the traditional centrifugal compressor to a lower pressure range, a design method for matching the geometric parameters of a centrifugal compressor with an expander is proposed. This method was applied to design a centrifugal compressor corresponding to an existing expander, which was validated using a centrifugal compressor model previously analyzed by other researchers. Computational fluid dynamics (CFD) was employed to simulate and assess the operational performance of the expander-compressor under variable operating conditions, including the utilization efficiency of the expansion power. A centrifugal compressor designed using this method achieved more than 92% and 88% utilization efficiency under the nominal operating condition and variable operating condition, respectively. The expander functioned smoothly within the designed mass flow rate range. |
| Key words: air compression refrigeration turbo compressor centrifugal compressor design expansion power utilization efficiency |
