the rotor, smallscale turbulence and threedimensional flow structures have been determined to be of at least equal significance to the backflushing effect of the rotor elements. A comprehensive model of the rotor action has been developed to embrace both pulsation and nonpulsation effects. Two novel rotor designs that follow from this model are
1 Introduction. Coaxial rotor wind turbine is to chain the advantages of the coaxial rotor assembly with the design of conventional wind turbine. The rotor may be controlled in both directions with respect to the wind flow. Theoretical literature reveals that the wind turbine should develop twice as much as power than the conventional single ...
effects of head and rotor clearances on leakage of flow rate and pressure in a novel noncontact rotor blower September 2019 Vietnam Journal of Science and Technology 57(6A):125140
A threedimensional computational model is established to simulate the air flow patterns in the rotor spinning unit of a rotor spinning machine. The effects of rotor speed, rotor diameter and rotor slide wall angle on air flow characteristics and hence yarn properties are investigated. The airstream accelerates from the transfer channel inlet ...
The aerodynamic performance and pressure ratio of modern aircraft engine compressor are degrading due to unsteady flow distorted aerodynamic loads and complex phenomena in the blade tip. This paper attempts to improve the performance of modern axial flow transonic compressor stage under distorted flow conditions by incorporating the combination of groove casing, tip injection technique with ...
Operation. A rotary screw uses two rotors to push air through the compressor, which creates pressure. Compression is accomplished by the main and secondary rotors synchronously meshing in a onepiece, dualbore housing. The main rotor has helical lobes and the secondary rotor has helical grooves (Fig. 2).
Abstract. In this paper, a method to determine the angle of attack on a wind turbine rotor blade using a chordwise pressure distribution measurement was applied. The approach used a reduced number of pressure tap data located close to the blade leading edge. The results were compared with the measurements from three external probes mounted on the blade at different radial positions and with ...
Obtained results indicate that grinding pressure, primary air (PA) temperature and mill motor current have a tendency to rise by increasing coal feeding mass flow rates for all used coal.
Guizani et al., (2016) developed a numerical model for prediction of flow in the dynamic separator and to investigate the effects Page 3 of 41 of different types of outlets on the pressure drop ...
In this work, the rotational molding process is developed to manufacture in one piece an axialflow turbomachine rotor with hollow blades. Giving to our knowledge, this process has never been employed in the making of these turbomachine components. Indeed, the blades of these rotors are typically solid blades and are making by injection molding, machining, or thermoforming. The effects of ...
portions rw, base circle radius rb and rotor diameter D. 127 rb r p (1) r "' rb 1T 4 c . ! (2) w D 2(r p + rw) (3) Critical pressure angle becomes ~crit"' tanl 1T/4. The location of the starting point of involute profile relative to the rotor major and minor axis (:l',y) is given by the following equations
Rotorstator cavities are often found in turbomachinery; they supply cold air that is bled from the compressor to the turbine blades. The pressure of the outlet of a rotorstator cavity is axisymmetric under normal circumstances. However, its pressure would be nonaxisymmetric in the event of blade fracture. The impact of blade fracture on a rotorstator cavity with centrifugal superposed flow ...
The main function of the rotor is to prevent the narrow cylinder apertures from becoming plugged by pulp and debris. In this study, the pressure pulses generated by a novel multielement foil (MEF) and a singleelement foil rotor in a pressure screen were measured at various foil configurations, rotor speeds, and flow rates.
This article numerically studied the flow and heat transfer characteristics of the fullribbed fluted tip of a rotor with four types of distribution of cooling films, namely, the midarc uniform film at the bottom of the groove, the uniform film on full perimeter ribs, the uniform film on the suctionside rib, and the uniform film on the pressureside rib. The evolution of secondary flow in ...
In order to prevent the small apertures in the cylinder from plugging with fibres and debris, the rotor spins inside the cylinder, generating negative pressure pulses at the cylinder surface that backflush the flow through the apertures, clearing them of debris (14).
The shifts generate radial forces on the flow due the pressure difference between pressure and suction sides, thus influencing the radial distribution of flow rate and blade loading. The effects are similar to those discussed with steam turbines in Sect. of Chap. 6, but the terms sweep and lean were used there for inclinations in meridional ...
they enter the slipped wall of the rotor by the high negative pressure, then the fibers gathered and twisted to form rotor spun yarn [4]. Coruh et al. studied the effect of the nozzle type as one of the most important parts of the openend rotor spinning system on yarn quality and found that the nozzle type mostly affects yarn quality and
Existing experiments, simulations, and analysis have shown that the flow field of the blade tip has a significant effect on rotating stall and acoustic resonance in aeroengine compressors. Based on the numerical simulation of NASA rotor 37, the steady influence of air injection at blade tip was investigated in this investigation. The results show that the injected flow could obviously extend ...
Thrust on Turbine Rotor: A turbine extracts wind energy, causing the difference in momentum of air streams between the upstream and downsteam sides as shown in Fig. Eqn. () indicates that for designing a wind energy generator (WEG) a large axial force can be obtained by using large diameter turbines.
Abstract. The flow upwind of an energyextracting horizontalaxis wind turbine expands as it approaches the rotor, and the expansion continues in the vorticitybearing wake behind the rotor. The upwind expansion has long been known to influence the axial momentum equation through the axial component of the pressure, although the extent of the influence has not been quantified. Starting with ...
Rotational effects influence the aerodynamic performance of wind turbine rotor severely. The objective of this research attempted to study the rotational effects in the vicinity of the wind ...
New facility setup for the investigation of cooling flow, viscous and rotational effects on the interstage seal flow behavior of a gas turbine. ASME Paper No. GT. Google Scholar. Huening, M. 2010. Parametric single gap turbine rim seal model with boundary generation for asymmetric external flow.
The nonstationary pulsations are obtained as a result from the stator‐rotor interaction, mainly. Periodic phenomenon, caused by stator‐rotor interaction effects, excites both the flow, passing over blade surfaces, and boundary layer characteristics . This results in an increased production of the so‐called turbulent spots and shifts the ...
As shown in Fig. 1, this work focuses on an unshrouded rotorstator system with a centered natural suction, which is a basic configuration of rotorstator rotor rotates with the angular velocity of ω 0. R is the radius of rotor and stator, R d is the radius of opening in the stator allowing a natural suction of ambient air, and s is the spacing between the rotor and stator.
reject stream. The rotor uses a foil to which generates pressure pulses at the screen surface to backflush the narrow slotted apertures clearing them of accumulations that could lead to plugging [14]. The rotor design and speed thus directly affect the maximum capacity of the screen [5]. The pressure pulsations typically contain two components.
in an attempt to account for the important effect of journal misalignment in rotor bearing systems. The difficulty of accurately estimating the dynamic coefficients at high eccentricity ratios was pointed out. The potential inaccuracies in calculating the dynamic coefficients using the ratio of pressure change due to a film thickness
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