Comparison of Partial Admission Axial and Radial Inflow Turbines for Underwater S-CO2 Power Cycle System

• Published in: 水下无人系统学报 Vol. 32; no. 1; pp. 87 - 96
• Main Authors: Hanwei WANG, Xiaopeng JIANG, Kai LUO, Jianan ZHANG, Jianjun DANG, Kan QIN
• Format: Journal Article
• Language: Chinese
• Published: Science Press (China) 01.02.2024
• Subjects: aerodynamic performance; axial and radial turbine; supercritical carbon dioxide; unmanned undersea vehicle
• ISSN: 2096-3920
• DOI: 10.11993/j.issn.2096-3920.2023-0037

The reasonable application of supercritical carbon dioxide(S-CO2) power cycle systems to unmanned undersea vehicles(UUVs) can help address the problem of low efficiency for the existing UUV steam power cycle systems, especially for small-power applications. In order to select the optimal turbine for the underwater S-CO2 system, the one-dimensional approach combined with the loss model was used to obtain the best geometric parameters within the design space. In addition, the three-dimensional numerical simulation method based on the RANS equation was adopted to verify the rationality of the one-dimensional design method. The aerodynamic performance and flow characteristics of the axial/radial turbine were further compared. The results show that the internal efficiency of the radial turbine is 5.41% higher than that of the axial turbine under the design conditions, but the size of the radial turbine is larger, about twice that of the axial turbine. The main loss of the radial turbine is from the nozzle and the