Evaluating the inter-lobe clearance of twin-screw compressor by the iso-clearance contour diagram (ICCD)

Fong, Zhang‐Hua; Huang, Fu-Hui; Fang, Hanliang

doi:10.1016/s0094-114x(01)00018-0

Cited by 14 publications

(7 citation statements)

References 1 publication

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“…The authors have earlier presented a procedure named ICCD [1] and now propose a new concept to describe the interlobe clearance for the nonconjugate rotor profiles of a twin-screw vacuum pump. This concept is inspired by the red-lead and tooth-contact pattern and results in the maximum sphere method and the minimum cross-section method.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Interlobe Clearance and Determining the Sizes and Shapes of All the Leakage Paths for Twin-Screw Vacuum Pump

Fong¹,

Huang²

2006

Proceedings of the Institution of Mechanical Engineers, Part C:

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The maximum sphere method and the minimum cross-section method are proposed to calculate the interlobe clearance between two mating screw rotors and to determine the shapes and sizes of all the leakage paths. These two methods are inspired by the red-lead and tooth-contact pattern and can be used to evaluate the interlobe leakage and to design the mating rotor profiles. The combined results of these two methods provide the basis for an exact evaluation of the fluid leakage, and this feature increases flexibility in geometrical designing and manufacturing of the screw rotors. These methods are also suitable for non-conjugate rotors and contribute to thermal analysis and optimum programming.

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Section: Introductionmentioning

confidence: 99%

Evaluating the Interlobe Clearance and Determining the Sizes and Shapes of All the Leakage Paths for Twin-Screw Vacuum Pump

Fong¹,

Huang²

2006

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…and found the interlobe leakages lower in comparison to all other leakages. Fong et al (2001) proposed a mathematical model calculating the interlobe clearances between two rotors. The clearance field was presented by an iso-clearance contour diagram (ICCD).…”

Section: Interlobe Clearance Leakages In Twin-screw Compressormentioning

confidence: 99%

Prediction of Interlobe Leakages in Screw Compressors

2021

JAFM

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The clearance gaps in twin-screw compressors are critical for their performance and reliable operation, as the leakage flows through these clearances influence the volumetric and adiabatic efficiencies. The amount of leakage flows depends on the clearance size and shape as well as various geometric and operating parameters. Usually, the isentropic nozzle equations along with appropriate flow coefficients are used for more accurate estimation of the leakage flow rates through the clearance gaps. Hence, a proper understanding of the flow coefficients and their relationship with the dimensionless parameters (such as pressure ratio, Reynolds number, and aspect ratios) is critical for an accurate prediction of the leakage flows. In the present study, considering the interlobe clearance gap in screw compressor in terms of rectangular openings, the interlobe leakage flow rates are estimated for various opening sizes and pressure conditions using isentropic nozzle equations and an iterative method. The flow coefficients are determined by comparing the experimental values obtained using a specialized test rig and the flow rates obtained from the analytical methods. The dimensionless parameters are varied to see their individual effect on the leakage mass flow rates and on the flow coefficients. The mean deviation from the experimental results when using an analytical iterative procedure (-8.5%) is substantially lower in comparison to the mean deviation (+26.8%) using the isentropic nozzle equations. The study validates that the iterative method can be preferred (for an interlobe leakage flow rate prediction) over the isentropic nozzle equation method.

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“…Fong et al [14] proposed a new mathematical procedure for calculating the inter-lobe clearance between two screw rotors, and described the clearance field with the iso-clearance contour diagram (ICCD). The geometrical and kinematical relations of mating rotors were calculated by the theory of gearing and the tooth contact analysis (TCA), and the contact lines and the approximate blowhole were calculated by TCA.…”

Section: Research On Screw Mechanical Leakagementioning

confidence: 99%

Overview of the Development and Application of the Twin Screw Expander

et al. 2020

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With the development of society, the energy crisis has become increasingly prominent, which greatly affects the sustainable development of the economy of various countries. Industrial energy consumption accounts for more than 70% of China’s total energy consumption, of which more than 50% is converted to industrial waste heat, and recyclable waste heat resources account for about 60% of the total waste heat resources, while China’s current utilization rate of industrial waste heat only reaches about 30%. The development of renewable energy and recovery of low-grade waste heat in industry is the key to solve the problem. As a type of volumetric expander with full flow expansion, the screw expander is extensively applied in the industrial waste heat recovery and geothermal energy generation industry because of its effective utilization of low enthalpy energy. Improving the performance of the screw expander as the core, the paper concludes and summarizes the research status of the leakage, rotor geometry, sealing and lubrication, processing and manufacturing, which can affect the performance of the screw expander. In addition, it also introduces the application status and potential utilization of screw expander.

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Evaluating the inter-lobe clearance of twin-screw compressor by the iso-clearance contour diagram (ICCD)

Cited by 14 publications

References 1 publication

Evaluating the Interlobe Clearance and Determining the Sizes and Shapes of All the Leakage Paths for Twin-Screw Vacuum Pump

Evaluating the Interlobe Clearance and Determining the Sizes and Shapes of All the Leakage Paths for Twin-Screw Vacuum Pump

Prediction of Interlobe Leakages in Screw Compressors

Overview of the Development and Application of the Twin Screw Expander

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