City Research Online

Axial Flow Characteristics within a Screw Compressor

Nouri, J. M., Guerrato, D., Stosic, N. & Arcoumanis, C. (2008). Axial Flow Characteristics within a Screw Compressor. HVAC&R Research, 14(2), pp. 259-274. doi: 10.1080/10789669.2008.10391007


Angle-resolved axial mean flow and turbulence characteristics were measured inside the working chamber of the male rotor of a screw compressor with high spatial and temporal resolution using laser Doppler velocimetry at two rotor speeds, 750 and 1000 rpm. Measurements were performed through a transparent window near the discharge port to allow the application of various laser techniques. The results showed that an angular resolution up to 2° could fully describe the flow variation inside the chamber. The cyclic flow variation between different working chambers was found to be similar in both the mean and turbulence velocities. The effect of the discharge port opening on the axial mean and root mean square velocities was found to be significant near the leading edge of the rotors, causing a steep increase in mean and root mean square velocities of the order of 4.2 times the pitch velocity, Vp . This effect is less pronounced on the flow near the root of the rotor; large fluctuations and instability in the mean flow was caused by rapid flow expansion during the port opening. The obtained data will be used to validate a computational fluid dynamics model of the fluid flow within twin screw compressors, which could allow reliable optimization of various compressor designs.

Publication Type: Article
Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in HVAC&R Research on 25 Feb 2011, available online:
Publisher Keywords: Screw compressor, Laser Doppler velocimetry, axial flow velocity, Cycle-resolved averaging
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Science & Technology > Engineering
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