نتایج جستجو برای: q blade
تعداد نتایج: 133137 فیلتر نتایج به سال:
background: many types of single-use blades are manufactured with different designs and materials. there have been several reports of difficulties in obtaining a view of the glottis with single-use laryngoscopes. the purpose of this prospective study was to compare the quickness and the success rate of endotracheal intubations with two different laryngoscope blades: disposable laryngoscope blad...
The purpose of this paper is to correlate the four formant frequencies F1–F4 and quality factors Q1–Q4 with the positions, areas, or area ratios formed by the four active articulators: tongue root, tongue body, blade, and lips. The quality or amplification factor Q is the formant frequency F divided by the bandwidth B. Toward this end, a 27-tube frequency-domain vocal tract model (FDVT) is deve...
Effect of Inlet Geometry on the Turbine Blade Tip Region Heat Transfer Coefficient and Effectiveness
An experimental investigation of the local film cooling effectiveness and heat transfer coefficient downstream of a row of elongated holes in a simulated axial turbine blade tip is presented. Film cooling is needed to protect the turbine blade tip region from high heat transfer rates, especially when cooling by convection is insufficient to keep the temperature distribution of the blade within ...
A model order reduction technique that yields low-order models of blade row unsteady aerodyamics is introduced. The technique is applied to linearized unsteady Euler CFD solutions in such a way that the resulting blade row models can be linked to their surroundings through their boundary conditions. The technique is applied to a transonic compressor aeroelastic analysis, in which the high-fidel...
To investigate the effect of blade wrap angle on hydrodynamic radial force a single centrifugal pump, numerical simulation is conducted pumps with different angles. The external characteristics and pump was analyzed according to result. It found that, increase angle, head efficiency are improved, H-Q curve becomes steeper, also increased gradually, while high-efficiency area narrowed. has great...
As wind turbines continue to grow larger, problems associated with adverse aerodynamic loads will grow more critical. Thus, the wind energy technical community has begun to seriously consider the potential of aerodynamic control methodologies for mitigating adverse aerodynamic loading. Spatial and temporal attributes of the structures and processes present in these flow fields hold important im...
Ice accumulation on wind turbines operating in cold regions reduces power generation by degrading aerodynamic efficiency and causes mass imbalance and fatigue loads on the blades. Due to blade rotation and variation of the pitch angle, different locations on each blade experience large variations of Reynolds number, Nusselt number, heat loss, and non-uniform ice distribution. Hence, applying di...
Hydropower plants are indispensable to stabilize the grid by reacting quickly to changes of the energy demand. However, an extension of the operating range towards high and deep part load conditions without fatigue of the hydraulic components is desirable to increase their flexibility. In this paper a model sized Francis turbine at low discharge operating conditions (Q/QBEP = 0.27) is analyzed ...
A wind turbine is a device that converts mechanical energy into electrical by its rotary action. In this paper, turbine’s lift and power characteristics are improved employing vortex generator as passive flow control on the surface of turbine. triangular used for study simplicity in design effective results. NACA 4418 airfoil selected conceptual BEM (Blade Element Momentum theory), geometrical ...
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