Influence of rotor speed, discharge pressure, and clearance size on the unsteady flow dynamics and heat interaction of roots blower

The geometry of the 2-lobe rotors of a roots blower is proposed by the combination of three arcs and is parameterized by two independent variables. By considering a standard combination of these variables, attempts are made to grasp the unsteady interior flow phenomena and thermal interaction in the...

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Bibliographic Details
Published in:Journal of the Brazilian Society of Mechanical Sciences and Engineering 2021, Vol.43 (1), Article 48
Main Authors: Bhuyan, Pranjal, Ghosh, Suman
Format: Article
Language:English
Subjects:
Discharge
Engineering
Exhaust velocity
Flow control
Fluid dynamics
Fluid flow
Heat
Independent variables
Internal flow
Mechanical Engineering
Roots
Rotor speed
Technical Paper
Unsteady flow
Velocity
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Summary:The geometry of the 2-lobe rotors of a roots blower is proposed by the combination of three arcs and is parameterized by two independent variables. By considering a standard combination of these variables, attempts are made to grasp the unsteady interior flow phenomena and thermal interaction in the blower as well as to comprehend the effect of main influencing factors on the performance of the blower using a transient finite volume-based dynamic-mesh-rearrangement method. A grid-independent test is conducted, and the adopted methodology is validated. At first, an endeavor is made to realize the transient internal flow field and heat interaction within the roots blower. Then, individual efforts are made to apprehend the effect of rotor speed, discharge pressure, and clearance size (provided in between the rotors or in between the rotors and casing) on the said transient flow dynamics and heat interaction. Time variation of the discharge velocity, mass flowrate, and discharge temperature are found to be fluctuating in nature. Pressure, velocity, and temperature distributions in the blower, as well as the leakages, backflow, vortices in the blower, etc., at different moments, are found to be strongly dependent on the rotor speed, discharge pressure, clearance size between the rotors or between the rotor and housing. The nature and amplitude of the time variation of exhaust velocity, discharge mass flowrate, outlet-temperature, and the blower performance are also found to be very much sensitive to the chosen rotor speed, discharge pressure, and clearance size.
ISSN:1678-5878
1806-3691
DOI:10.1007/s40430-020-02729-0