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Journal of Applied Fluid Mechanics، جلد ۱۵، شماره ۳، صفحات ۷۹۳-۸۰۲
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عنوان انگلیسی Study on Flow Characteristics of Helium Turboexpander with a Novel Intake Structure
چکیده انگلیسی مقاله The cylindrical volute intake structure possesses some advantages including convenient processing, convenient installation & uninstallation and high machining efficiency. The helium turboexpander with this novel intake structure in a superconducting cryogenic device is investigated deeply in this study. Based on the established mathematical model and the corresponding numerical computation methods, the whole flow passage internal flow of the helium turboexpander is numerically simulated. And then the distribution characteristics of total pressure, static pressure, static temperature, relative velocity and total enthalpy in the cylindrical volute, nozzle, impeller and diffuser are explored, and loss mechanism of the internal flow is analyzed. The results indicate that the novel cylindrical volute intake structure has obvious pre-rotation effect on the inlet flow field of the nozzle, and this intake structure has little loss. In addition, the expansion effect in downstream components including nozzle and impeller is obvious, and the flow field changes uniformly. The overall efficiency of the turboexpander is up to 84.8%, which indicates that it is reasonable that the novel cylindrical volute is used as the intake structure of turboexpander.
کلیدواژه‌های انگلیسی مقاله Helium turboexpander, Cylindrical volute intake structure, Numerical simulation, Flow characteristics
نویسندگان مقاله L. Chen |
College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

B. Meng |
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

Z. Zhang |
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

Y. Xiao |
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

نشانی اینترنتی https://www.jafmonline.net/article_2030_9f5b1d13b64a83cd2d3d9f59f01485aa.pdf
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