نویسنده: mohammad layeghi

دانلود مقاله مروری بر کاربردهای فناوریهای بازیابی و تبدیل انرژی بر مبنای سیستمهای انتقال هیدرولیکی The applications of energy regeneration and conversion technologies based on hydraulic transmission systems: A review

Hydraulic transmission systems (HTSs) are widely used in various industrial fields. With the increase in research
on renewable energy and energy-saving technologies, energy regeneration and conversion (ERC) technologies
based on HTSs, including potential energy regeneration, braking energy regeneration, vibration energy acquisition
and power take-off (PTO), have attracted increasing attention. First, this review briefly explains the main
concepts of ERC technologies based on HTSs and applications; then their working principles are analysed. As the
main content of this review, the current status of ERC technologies based on HTSs in the application fields of
construction machinery, hydraulic vehicles, regenerative suspensions and wave energy converters (WECs) are
comprehensively analysed, compared and discussed. Finally, ERC technologies based on HTSs are prospected
from the aspects of hydraulic system component optimization, all-electric power system integration and potential
applications. This review is expected to provide readers with a comprehensive and clear understanding of
ERC technologies based on HTSs through a detailed overview of their application, which will provide an important
reference for further research and potential applications in this field.

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دانلود مقاله تئوری لایه مرزی:یک پارادوکس قرن بیستم؟ LAMINAR BOUNDARY-LAYER THEORY: A 20TH CENTURY PARADOX?

Boundary-layer theory is crucial in understanding why certain phenomena
occur. We start by reviewing steady and unsteady separation from
the viewpoint of classical non-interactive boundary-layer theory. Next,
interactive boundary-layer theory is introduced in the context of unsteady
separation. This discussion leads onto a consideration of large-
Reynolds-number asymptotic instability theory. We emphasise that a
key aspect of boundary-layer theory is the development of singularities
in solutions of the governing equations. This feature, when combined
with the pervasiveness of instabilities, often forces smaller and smaller
scales to be considered. Such a cascade of scales can limit the quantitative
usefulness of solutions. We also note that classical boundarylayer
theory may not always be the large-Reynolds-number limit of the
Navier-Stokes equations. This is because of the possible ampli cation of
short-scale modes, which are initially exponentially small, by a Rayleigh
instability mechanism.

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دانلود مقاله مروری بر فناوری روتور موجی و کاربردهای آن A Review of Wave Rotor Technology and Its Applications

The objective of this paper is to provide a succinct review of past and current research in
developing wave rotor technology. This technology has shown unique capabilities to
enhance the performance and operating characteristics of a variety of engines and machinery
utilizing thermodynamic cycles. Although there have been a variety of applications
in the past, this technology is not yet widely used and is barely known to engineers.
Here, an attempt is made to summarize both the previously reported work in the literature
and ongoing efforts around the world. The paper covers a wide range of wave rotor
applications including the early attempts to use wave rotors, its successful commercialization
as superchargers for car engines, research on gas turbine topping, and other
developments. The review also pays close attention to more recent efforts: utilization of
such devices in pressure-gain combustors, ultra-micro gas turbines, and water refrigeration
systems, highlighting possible further efforts on this topic. Observations and lessons
learnt from experimental studies, numerical simulations, analytical approaches, and
other design and analysis tools are presented. DOI: 10.1115/1.2204628

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