Open Access
ARTICLE
Bin Wang1, Jing Zheng1, Yuanyuan Yu1,2, Runmin Lv1, Changyue Xu1,*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 675-684, 2020, DOI:10.32604/fdmp.2020.09681
（This article belongs to this Special Issue: High-Speed and High-Temperature Flows)
Abstract Rocket sleds belong to a category of large-scale test platforms running
on the ground. The applications can be found in many fields, such as aerospace
engineering, conventional weapons, and civil high-tech products. In the present
work, shock-wave/rail-fasteners interaction is investigated numerically when the
rocket sled is in supersonic flow conditions. Two typical rocket sled models are
considered, i.e., an anti-D shaped version of the rocket sled and an axisymmetric
slender-body variant. The dynamics for Mach number 2 have been simulated in
the framework of a dynamic mesh method. The emerging shock waves can be
categorized as head-shock, tailing-shock and reflected-shock.… More >
Open Access
ARTICLE
Hao Cheng, Guangsheng Du*, Meng Zhang, Kun Wang, Wenbin Bai
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 685-698, 2020, DOI:10.32604/fdmp.2020.09673
（This article belongs to this Special Issue: High-Speed and High-Temperature Flows)
Abstract The determination of the circulation for wind turbine blades is an
important problem in engineering. In the present study, we develop a specific
approach to evaluate the integral that represents mathematically the circulation.
First the potentialities of the method are assessed using a two-dimensional
NACA64_A17 airfoil as a testbed and evaluating the influence of different integration paths and angles of attack on the circulation value. Then the method is
applied to blades with different relative heights in order to provide useful reference data to be used for the optimization and reverse design of wind turbine
blades. As shown by the… More >
Open Access
ARTICLE
Guiju Zhang1,2, Caiyuan Xiao1,2,*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 699-707, 2020, DOI:10.32604/fdmp.2020.09481
Abstract In this study, assuming a certain type of wheel loader as the main objective of the research, the performances of the working device of the loader are
investigated on the basis of an in-house code. After creating a three-dimensional
model of the working device using Solidworks, this model has been imported into
the dynamic simulation software ADAMS, and the simulation problem has been
completed by adding the relevant constraints and loadings. The load stress curve
relating to the main connecting point of the working device has been obtained in
the frame work of this approach and it has been shown… More >
Open Access
ARTICLE
Wei Zhang1,*, Tengwei Qiu1, Chunyan Yao2
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 709-721, 2020, DOI:10.32604/fdmp.2020.010748
Abstract In this study, magnetic abrasives were obtained by crushing and sieving
sintered iron-silicon carbide (Fe-SiC) composites. Fe and SiC powders with different mesh numbers were pre-compacted using different pressures and then sintered at various temperatures and with different holding times. The dispersion
uniformity of the SiC powder was improved through surface modification using
polyethylene glycol (PEG) 300. The resulting magnetic abrasives were characterized in terms of phase composition, density, relative permeability, and microstructure; this was followed by a comprehensive analysis to reveal the optimal
processing parameters. The ideal combination of process parameters for preparing
SiC magnetic-abrasive grains for the magnetic… More >
Open Access
ARTICLE
Andrey Y. Ilinykh*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 723-735, 2020, DOI:10.32604/fdmp.2020.08987
（This article belongs to this Special Issue: Hydrodynamics of a Drop)
Abstract The distribution of material resulting from the impact of a freely falling
drop with a target liquid has been studied by photo and video registration methods. Different cases have been investigated by considering drops made of aqueous
solutions (ink, salt, acid) and including fine solid particles (i.e., suspensions). New
features have been observed in terms of flow dynamics and thin components produced as a result of the impact (such as banded elements, ligaments, and vortices
at the surface of the liquid). In particular, the characteristics of emerging netlike
structures have been found to depend on the size of the suspension… More >
Open Access
ARTICLE
V. E. Prokhorov*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 737-746, 2020, DOI:10.32604/fdmp.2020.08988
（This article belongs to this Special Issue: Hydrodynamics of a Drop)
Abstract The collision of droplets with a water surface is being actively developed in the interests of many applied problems—transfer of matter through the
ocean-atmosphere boundary, underwater acoustic noise of the marine environment, measurement of precipitation intensity, various technologies, and much
more. One of the research priorities is acoustic radiation, in particular, shock
sound arising at the moment a drop contacts the surface. The impact of the drop
is preceded by processes that affect the shape of the drop, because of which it
noticeably deviates from the spherical one. As a result, the final (contact) velocity
changes–one of the most important… More >
Open Access
ARTICLE
Mikhail G. Shatrov1, Valery I. Malchuk2, Andrey Y. Dunin1,*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 747-760, 2020, DOI:10.32604/fdmp.2020.08991
（This article belongs to this Special Issue: Hydrodynamics of a Drop)
Abstract This paper reports a laboratory investigation of the fuel injection process in a diesel engine. The atomization process of the considered fuel (a hydrocarbon liquid) and the ensuing mixing with air is studied experimentally under
high-pressure conditions. Different types of injector nozzles are examined, including (two) new configurations, which are compared in terms of performances to a
standard injector manufactured by the Bosch company. For the two alternate con-
figurations, the intake edges of one atomizing hole (hole No. 1) are located in the
sack volume while for the other (hole No. 2) they are located on the locking cone… More >
Open Access
ARTICLE
Aleksandr Shiryaev*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 761-771, 2020, DOI:10.32604/fdmp.2020.09010
（This article belongs to this Special Issue: Hydrodynamics of a Drop)
Abstract The problem relating to the small-amplitude free capillary oscillations
of an encapsulated spherical drop is solved theoretically in the framework of
asymptotic methods. Liquids are supposed to be inviscid and immiscible. The formulas derived are presented for different parameters of the inner and outer liquids,
including densities, thickness of the outer liquid layer, and the surface and interfacial tension coefficients. The frequencies of oscillation of the encapsulated drop
are studied in relation to several “modes” which can effectively be determined in
experiments by photo and video analysis. The results are presented in terms of
oscillation frequencies reported as a function… More >
Open Access
ARTICLE
Yuli D. Chashechkin*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 773-800, 2020, DOI:10.32604/fdmp.2020.09001
（This article belongs to this Special Issue: Hydrodynamics of a Drop)
Abstract The structure of the flow and the acoustic signals generated by the
impact of a freely falling drop of water with an underlying quiescent fluid have
been investigated for droplets having diameter 0.5 cm and a contact velocity in
the range 1.5 < U < 5 m/s. The experimental study has been supported by
high-resolution videos of the flow (as seen from above and from the side). The
evolution of ejecta, spikes, droplets spray, cavity, splash, secondary cavity, streamer, secondary droplets and sequence of capillary waves is reported accordingly.
In particular, perturbations of the smoothed free surface with transverse dimensions… More >
Open Access
ARTICLE
Yuli D. Chashechkin, Andrey Y. Ilinykh*
FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.4, pp. 801-811, 2020, DOI:10.32604/fdmp.2020.09168
（This article belongs to this Special Issue: Hydrodynamics of a Drop)
Abstract The interaction of a falling drop (diluted aqueous solution of ink in various concentrations) with a target fluid (partially degassed tap water) has been
tracked by means of high-resolution video recording and photography. The
experimental setup has carefully been prepared in order to preserve the axial symmetry of initial conditions. Three regimes of interaction have been identified
accordingly (depending on the drop velocity as controlled by the distance of fall):
rapid droplet coalescence, rebound with the conservation of the drop volume and
shape, and partial coalescence. Previous findings are recovered and confirmed,
and enriched with heretofore unseen observations of complex… More >
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