2020
DOI: 10.3390/designs4010003 View full text |Buy / Rent full text
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Abstract: Computational fluid dynamics (CFD) can help in understanding the nature of leakage flow phenomena inside the rotary positive displacement machines (PDMs). However, due to the lack of experimental results, the analysis of leakage flows in rotary PDMs by CFD has not yet been fully validated. Particle image velocimetry (PIV) tests with a microscopic lens and phase-lock were conducted to obtain the velocity field around the tip gap in an optical Roots blower. The three-dimensional unsteady CFD model of the Roots b… Show more

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“…An investigation of flow through the male rotor housing clearance of screw machines was carried out by Utri [11] who compared simulation results with flow pictures obtained using the Schlieren method. Recently, an experimental and numerical study of a roots blower in actual running condition was carried out by Sun et al [12], They implemented the PIV technique for clearance flow visualization. A series of factors deteriorating the results of the PIV test were observed such as the surface flaws of the transparent window, the reflection of the surface, the jitter in the phase-locking due to uncertainties in the transmission of the synchronized gear, the accumulation of the liquid particles and the pressure fluctuations.…”
Section: Introductionmentioning
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“…An investigation of flow through the male rotor housing clearance of screw machines was carried out by Utri [11] who compared simulation results with flow pictures obtained using the Schlieren method. Recently, an experimental and numerical study of a roots blower in actual running condition was carried out by Sun et al [12], They implemented the PIV technique for clearance flow visualization. A series of factors deteriorating the results of the PIV test were observed such as the surface flaws of the transparent window, the reflection of the surface, the jitter in the phase-locking due to uncertainties in the transmission of the synchronized gear, the accumulation of the liquid particles and the pressure fluctuations.…”
Section: Introductionmentioning
“…Radial leakage though had a greater effect on the volumetric performance than tangential leakage (specifically in hydrogen scroll pumps). Sun et al [7,28] performed a PIV test to obtain the velocity field around the tip gap and used SCORG™ (Screw Compressor Rotor Grid Generation) software to predict the leakage flow under same operating conditions. In the majority of areas, the main flow pattern and velocity magnitude were found to be the same in the CFD simulation as well as the experimental analysis, though the CFD study overestimated the leakage flow velocities.…”
Section: Introductionmentioning