Experimental Evaluation of Advanced Archimedes Hydrodynamic Screw Geometries

Straalsund, J.L.; Harding, Samuel F.; Nuernbergk, Dirk Michael; Rorres, Chris

doi:10.1061/(asce)hy.1943-7900.0001479

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…Utri et al 11,12 optimized the variable lead rotor pair for an industrial air screw compressor via high number of rotor segments attaining to a uniformly varying lead. Straalsund et al 13 validated an Archimedes hydrodynamic screw three-dimensional printed models based on a bench-scale performance test, and the various shapes and parameters have been verified. Zo¨llig 14 found that energy consumption of variable-pitch rotor was lower in the degassing process of compressing screw vacuum pumps and Roots pumps.…”

Section: Introductionmentioning

confidence: 99%

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

Zhang

Liu

Yong-ju

et al. 2022

Advances in Mechanical Engineering

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Cross-section profile of rotor takes a great effect on the performance of dry-screw vacuum pump. A novel smooth rotor profile consisting of eight segments of curves, including arcs and conjugate correction curves is proposed. Advantages are that it can be used to solve the unsmooth connection and no meshing clearance in traditional profile. The meshing model for new profile can directly generate stable addendum clearance, tooth clearance, tooth side clearance, and radial clearance. The influences of the epicycloid rotation angle, arc radius and involute offset distance of the conjugate correction curve on the clearances are studied according to established theoretical model. And transient flow field of vacuum pump is analyzed by using the commercial software Ansys-Fluent®. Compared to traditional screw vacuum pump, the results shows that pressure in inlet and pump cavity is lower, and maximum pumping speed is higher, indicating that the proposed design is superior.

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Section: Introductionmentioning

confidence: 99%

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

Zhang

Liu

Yong-ju

et al. 2022

Advances in Mechanical Engineering

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“…However, the study did not compare the modified turbine with the typical Archimedes turbine. The other modification was conducted by Stralsund et al [41], who introduced two new blade shapes, i.e., strake and inverse strake blade. It is obtained that the two blades produced do not significantly impact the efficiency and performance compared to the conventional helical blade.…”

Section: Introductionmentioning

confidence: 99%

Design Procedure of Archimedes Hydro Turbine

Siswantara¹,

Syafe’I²,

Budiyanto³

et al. 2021

Journal of Southwest Jiaotong University

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This study aims to develop a simple-practical design procedure to determine the appropriate size of the turbine's outer radius for any given internal parameters according to the available flow rate through numerical calculation. The calculation is performed using python programming language by combining the existing model of Archimedes turbine, including the power calculation model, turbine flow rate capacity, and losses modeling, into a procedural design calculation to produce the appropriate value. The design procedure could be used to obtain the required and could be able to accommodate the available water flow rate optimally for any given value of each internal parameter and available flow rate. It is obtained that a higher pitch ratio would result in smaller . Moreover, the value of 0.45 would give the smallest size of the appropriate . On the other hand, the higher turbine's inclination angle would require a greater . It is also revealed that the angle of will give the turbine optimum efficiency. In addition, it is also estimated that the Archimedes turbine would be more efficient in a higher available water flow rate. The resulting design shows a good agreement with the installed Archimedes turbine based on the surveyed data at some power plants. Therefore, the proposed design can improve Archimedes Turbine's design by providing the appropriate size of according to the available flow rate without any overflow or underfilling. The design procedure could also provide a practical tool for designing Archimedes turbine.

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“…Xiao et al 2017 [10] calculated the mass flow leakage of constant pitch screw vacuum pump and they found that each leakage path has different impacts on the pumping speed and total leakage rate. Jerry et al [11] provided the results of bench-scale testing of Archimedes hydrodynamic screw three-dimensional printed models, and they evaluate the performance of various shapes and parameters for Archimedes hydrodynamic screws. Zöllig [12] used dry compressing screw vacuum pumps and Roots pumps to the degassing process, and the performance research shown that the energy consumption of variable-pitch rotor was lower.…”

Section: Introductionmentioning

confidence: 99%

Effects of stable clearances on backflow in the variable-pitch screw vacuum pump

Zhang

Yong-ju

Chen

2021

Mechanics & Industry

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Effects of various clearances of variable-pitch screw vacuum pump on gas backflow of internal flow field of the pump cavity is studied. The theoretical tooth surfaces of screw rotor are optimized by radial, normal equidistance modifications, and four types of stable clearances of rotor circumferential, radial, tooth shape and tooth sides are obtained. The backflow calculation model in clearances considering Couette backflow and orifice backflow is improved. The three-dimensional model of variable-pitch screw vacuum pump is designed, and the experimental prototype and test device are developed. The internal backflow of vacuum pump is analyzed by using the commercial software Ansys-Fluent® and the calculation model. The results show that the smaller the clearances, the smaller the backflow and the higher the vacuum degree. Among the four types of clearances, the circumferential clearance plays the primary roles. The backflow is directly proportional to the inlet pressure and rotating speed. Predictions are validated by the experimental data with satisfied agreement.

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Experimental Evaluation of Advanced Archimedes Hydrodynamic Screw Geometries

Cited by 14 publications

References 14 publications

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

A novel design on smooth rotor profile with meshing clearance for screw vacuum pump

Design Procedure of Archimedes Hydro Turbine

Effects of stable clearances on backflow in the variable-pitch screw vacuum pump

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