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Open AccessArticle

Torque Characteristics of the Revolving Vane Air Expander

School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
Department of Mechanical Engineering, Faculty of Engineering, The University of Auckland, Auckland 1010, New Zealand
TUM—CREATE (Technical University of Munich—Campus for Research Excellence and Technological Enterprise), Singapore 138602, Singapore
Author to whom correspondence should be addressed.
Machines 2020, 8(3), 58;
Received: 3 August 2020 / Revised: 11 September 2020 / Accepted: 12 September 2020 / Published: 17 September 2020
The use of compressed air as an alternative source of clean energy requires an air expander to extract work. A new design, known as the revolving vane mechanism, has been proposed in an effort to develop high efficiency rotary machines. This paper provides an in-depth analysis by including the vibration characteristics of the revolving vane air expander to evaluate the steady-state operating output torque. A generic model for describing the revolving vane rotational vibration is first derived and subsequently modified to describe the prototype tested. Measurements show that the output torque is bimodal; arising from a tolerance gap between the vane and its slot during fabrication. This effect was found to be less pronounced at high operating speeds. The model is found to be in good agreement with the measured output torques. Further analysis with the validated model showed that extracting shaft work from the cylinder would result in better performance. View Full-Text
Keywords: revolving vane; air expander; pneumatic engine; lagrange equations; vibration revolving vane; air expander; pneumatic engine; lagrange equations; vibration
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MDPI and ACS Style

Aw, K.T.; Subiantoro, A.; Ooi, K.T. Torque Characteristics of the Revolving Vane Air Expander. Machines 2020, 8, 58.

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