نتایج جستجو برای: draft tube
تعداد نتایج: 122161 فیلتر نتایج به سال:
The inverse fluidized bed bioreactor was adapted for the axenic culture of heterotrophic microorganisms. Penicillin V synthesized by Penicillium chrysogenum ATCC 28089 was used as a model system for secondary metabolite production. The biomass growth rate was controlled by the rate of nutrient addition while an eroder in the inner draft tube limited the maximum biofilm thickness. When a lactose...
Pressure fluctuations in the draft tube mainly arise from rotational motion of vortex rope. The formation and development rope are significantly influenced by cavitation. However, precise mechanism underlying progression cavitation its initial weak state to a more severe level remains unclear. objective this study is investigate pump-turbine operating under part load turbine conditions. Numeric...
Computational Fluid Dynamics (CFD) was used to simulate the mixing characteristics of four different circular anaerobic digester tanks (diameters of 13.7, 21.3, 30.5, and 33.5m) equipped with single and multiple draft impeller tube mixers. Rates of mixing of step and slug injection of tracers were calculated from which digester volume turnover time (DVTT), mixture diffusion time (MDT), and hydr...
Effects of Pump-turbine S-shaped Characteristics on Transient Behaviours: Experimental Investigation
A pumped storage stations model was set up and introduced in the previous paper. In the model station, the S-shaped characteristic curves was measured at the load rejection condition with the guide vanes stalling. Load rejection tests where guide-vane closed linearly were performed to validate the effect of the S-shaped characteristics on hydraulic transients. Load rejection experiments with di...
The effects of three levels of soil moisture content (10 - 12, 13 - 15 and 16 - 18% d.b.) and three levels of plowing depth (15, 20 and 25 cm) on draft, specific draft, and drawbar power requirements of a 3 - bottom disk plow and on soil pulverization and inversion in a clay loam soil were investigated. The experimental design was a randomized complete block design with a 3 × 3 factorial. Excep...
The effects of three levels of soil moisture content (10 - 12, 13 - 15 and 16 - 18% d.b.) and three levels of plowing depth (15, 20 and 25 cm) on draft, specific draft, and drawbar power requirements of a 3 - bottom disk plow and on soil pulverization and inversion in a clay loam soil were investigated. The experimental design was a randomized complete block design with a 3 × 3 factorial. Excep...
We report on the experimental study of a precessing vortex core (PVC) in an air model Francis turbine. The focus is placed modal decomposition PVC that occurs draft tube turbine for range operation conditions. turbulent flow fluctuations are assessed using stereo particle image velocimetry (PIV) measurements. Proper orthogonal (POD) applied to antisymmetric and symmetric components velocity fie...
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