Abstract
This paper presents a mathematical model of torque for Single screw expanders (SSEs). Instantaneous torque and torque ratio were analyzed and discussed. The periodic variation of instantaneous torque is the same for different inlet pressure levels. The torque ratio, with its value close to 1, is independent of the inlet pressure of SSE. An experimental system was established to measure the torque, power and shaft efficiency of the self-developed SSE prototype, and results were used to validate the model. Comparison shows that the difference between calculated and experimental torque values is small (6.58 N.m to 7.55 N.m). The calculated and experimental output power is similar, with a difference of 2.07 kW to 2.37 kW. Therefore, the proposed model can be used to estimate the torque and output power of SSEs.
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Recommended by Associate Editor Tong Seop Kim
Yuting Wu got his doctorate from Beihang University, China, in 2000. From 2000 to 2002, he worked in Tsinghua University as a post doctor. Later he taught at Beijing University of Technology. Now he is a Researcher of the College of Environmental and Energy Engineering. His research interests include organic Rankine cycle technology recovering low-grade heat, solar thermal power, advanced refrigeration technology and molten salt for heat storage.
Ruiping Zhi got her master’s degree from China University of Petroleum, China, in 2012. Now she is a postgraduate student at Beijing University of Technology. Her research interests include key components of single screw compressor and expander and organic Rankine cycle for waste heat recovery.
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Wu, Y., Zhi, R., Wang, W. et al. Mathematical modeling of torque for single screw expanders. J Mech Sci Technol 31, 429–436 (2017). https://doi.org/10.1007/s12206-016-1245-8
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DOI: https://doi.org/10.1007/s12206-016-1245-8