Fluid mechanics of internal flow with friction and cutting strategies for micronozzles

Cai, Yukui; Wang, Qingqing; Song, Qinghua; Shi, Zhenyu; Wan, Yi

doi:10.1016/j.ijmecsci.2015.06.011

Cited by 18 publications

(7 citation statements)

References 14 publications

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“…Additionally, there are some uncertainties in geometrical parameters such as the inlet rounding radii or the orifice surface finish, which could impact in some way the nozzle outlet velocity and mass flow estimations [45]. In any case, differences between experimental and computational mass flow values are within typical ranges in the literature for this kind of simulations.…”

Section: Nozzle Orifice Calculationmentioning

confidence: 96%

Computational assessment of temperature variations through calibrated orifices subjected to high pressure drops: Application to diesel injection nozzles

Salvador

Carreres

Morena

et al. 2018

Energy Conversion and Management

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Section: Nozzle Orifice Calculationmentioning

confidence: 96%

Computational assessment of temperature variations through calibrated orifices subjected to high pressure drops: Application to diesel injection nozzles

Salvador

Carreres

Morena

et al. 2018

Energy Conversion and Management

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“…Mechanical micro cutting is an essential process in the manufacture of miniaturized components with high efficiency and precision. In our previous paper, a surface topography model based on the micro machining residual volume was developed for an axisymmetric nozzle [15,16]. Different surface roughness models have been proposed for CFD simulation.…”

Section: Micro-nozzle Surface Topography Modelling and Gas Flow Simul...mentioning

confidence: 99%

Effects of dimensional size and surface roughness on service performance for a micro Laval nozzle

Cai¹,

Liu²,

Shi

2017

J. Micromech. Microeng.

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Nozzles with large and small dimensions are widely used in various industries. The main objective of this research is to investigate the effects of dimensional size and surface roughness on the service performance of a micro Laval nozzle. The variation of nozzle service performance from the conventional macro to micro scale is presented in this paper. This shows that the dimensional nozzle size has a serious effect on the nozzle gas flow friction. With the decrease of nozzle size, the velocity performance and thrust performance deteriorate. The micro nozzle performance has less sensitivity to the variation of surface roughness than the large scale nozzle does. Surface quality improvement and burr prevention technologies are proposed to reduce the friction effect on the micro nozzle performance. A novel process is then developed to control and depress the burr generation during micro nozzle machining. The polymethyl-methacrylate as a coating material is coated on the rough machined surface before finish machining. Finally, the micro nozzle with a throat diameter of 1 mm is machined successfully. Thrust test results show that the implement and application of this machining process benefit the service performance improvement of the micro nozzle.

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“…18,19 Some novel tool materials or coating materials have low impact toughness and their research cycles are relatively long. 20,21 Notably, spraying liquid nitrogen or gases during machining tends to form microcracks and cause stress corrosion expansion. 22 Based on the above facts, restricted contact tool (RCT) design is the future trend for green and efficient machining.…”

Section: Introductionmentioning

confidence: 99%

Simulation and experiment on the effects and mechanism of variable-length restricted contact tool

Li,

Zhong,

Zhang

et al. 2023

Advances in Mechanical Engineering

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Difficult-to-machine materials such as stainless steel are widely used in the construction industry, because of their excellent mechanical properties and corrosion resistance. However, the poor tool-chip contact environment, severe tool wear, and heavy chip accumulation inhibit the machining efficiency. In this paper, 316L austenitic stainless steel was selected to investigate the effect of a variable-length restricted contact tool (VL-RCT), aiming at reducing the cutting temperature and increasing the tool life. A finite element simulation model of restricted contact cutting was established to investigate the machining parameters and restricted contact parameters on cutting performances and to clarify the mechanism of the VL-RCT in the cutting process. Additionally, cutting experiments were conducted to verify the cutting process mechanism. The results showed that the variable restricted contact structure efficiently reduced the cutting force and cutting temperature and improved the cutting performances of austenitic stainless steel. Both numerical simulation and cutting experiments reported that the trapezoidal restricted contact structure improved the cutting performance the best. Accordingly, this research provided theoretical guidance for the optimization of tool structure and the selection of cutting parameters, as well as a solid foundation for the future development of relevant design theories and methods for high-performance tools.

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Fluid mechanics of internal flow with friction and cutting strategies for micronozzles

Cited by 18 publications

References 14 publications

Computational assessment of temperature variations through calibrated orifices subjected to high pressure drops: Application to diesel injection nozzles

Computational assessment of temperature variations through calibrated orifices subjected to high pressure drops: Application to diesel injection nozzles

Effects of dimensional size and surface roughness on service performance for a micro Laval nozzle

Simulation and experiment on the effects and mechanism of variable-length restricted contact tool

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