Advanced design and simulation study of a centripetal turbine for efficient recovery of residual gas pressure

• Type: Article in International Scientific Journal
• Date: 2025

Authors

Mao, YQ (Author) Other; Cai, L (Author) Other; Chertovskih, R (Author) FEUP; Zhang, NJ (Author) Other; Guo, WJ (Author) Other

Journal

Title: Applied Energy

Vol. 377

ISSN: 0306-2619

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-017-22Z

DOI: 10.1016/j.apenergy.2024.124229

Abstract (EN): The transportation of natural gas offers significant opportunities for the recovery of residual pressure, a resource often underutilized due to valve regulations. Efficiently harnessing this residual pressure can markedly reduce the costs associated with gas transport, facilitating a more comprehensive use of energy resources. Central to this study is the development of a 90 mm micro-turbine, the pivotal element in the residual pressure recovery system. The research, supported by a custom-built turbine power generation test bench and guided by orthogonal experimental design, meticulously examines the impact of variables such as blade wrap angle, guide vane angle, and volute cross-section on the power generation capacity of the turbine. Employing a detailed entropy production rate model, the investigation delves into both the turbine's flow dynamics and entropy production distribution via sophisticated numerical simulations. Key findings reveal an optimized turbine design featuring a rectangular volute, a 10 degrees guide vane exit angle, and a 50 degrees blade wrap angle, achieving an impressive power output of 354.03 W under test conditions. The study identifies turbulence dissipation and wall entropy production as primary contributors to increased turbine entropy, with minimal effects from temperature-related entropy and time-averaged entropy production. It is demonstrated that augmenting the blade wrap angle promotes flow field development within the turbine, leading to enhanced turbulence dissipation entropy production. Conversely, reducing the guide vane angle boosts airflow velocity, aiding impeller work and subsequently increasing turbulence dissipation entropy production. Comparative analysis of various volute designs highlights the superior efficiency of the rectangular volute in energy conversion, reduced entropy production, and minimal velocity loss. This comprehensive research offers invaluable insights for understanding of power generation capacities, flow characteristics, and entropy production mechanisms in micro-centripetal turbines.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 18