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First, the internal flow field of each impeller was calculated.


Second, the concurrent working point of each impeller was approximately estimated.


Finally, a calculation was performed considering the influence on each impeller.


Although both impellers had the same blade crosssection, one impeller had a twodimensional blade, while the other had a leaned blade.


The average cavitation performance of each impeller was satisfactorily predicted by the numerical simulations.

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Cavitation in semiopen centrifugal impellers for a miniature pump


Cavitation in miniature pumps was investigated experimentally for two semiopen centrifugal impellers.


Although both impellers had the same blade crosssection, one impeller had a twodimensional blade, while the other had a leaned blade.


Three impellers (I, II, III) having same outer diameter, but different radius ratio and blade angles were employed for the investigation.


The total pressure developed by the impellers in each case is found to be maximum at a circumferential position of around 270°.

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Antibiotic production by the mutant strain, U190, however, appeared more shear sensitive than the parent culture FCRF 341 with maximum antibiotic titer being inversely related to impellor tip velocity, Tv.


Cases of physical interest involving offclamped beams include wobbling rotors, impellor blades, and turbine blades.


The impellor model described above predicts dynamo action for sufficientlystrong forcing.




 Based on the analysis of the working process of the vane ofvanetype oxygenadding machine under water, the paper puts forward the theorythat under stable operations, the moment of resistant force acted on the vane bythe water is mainly composed of two parts: the coherent moment of resistantforce and the working moment of resistant force. The paper also sets up thetheoretical formulas for calculating the total moment of resistant force andpower exhaustion. These theoretical formulas are varified through the... Based on the analysis of the working process of the vane ofvanetype oxygenadding machine under water, the paper puts forward the theorythat under stable operations, the moment of resistant force acted on the vane bythe water is mainly composed of two parts: the coherent moment of resistantforce and the working moment of resistant force. The paper also sets up thetheoretical formulas for calculating the total moment of resistant force andpower exhaustion. These theoretical formulas are varified through the calculation of power exhaustion of machines with various power through and they are of great practicalvalue in improving the design, decreasing the power exhaustion and reducingthe cost of the machine.  本文通过对叶轮式增氧机叶轮在水体中工作过程的分析,提出了叶轮在稳定工作状况下,水体作用在叶轮上的阻力矩,主要由水体对叶轮锥体的粘性阻力矩和水体作用在提水叶片上的工作阻力矩两部分组成,从而建立了计算叶轮工作时总阻力矩和功率消耗的理论公式。利用建立的理论公式,对几种不同功率的典型叶轮式增氧机功耗验算,均得到满意结果。  Mould design for impellerhub of axialflow fan were introduced. Besides, moulding processing of hub was discussed.  本文介绍了RTM法成型玻璃钢轴流风机叶轮轮毂的模具设计和轮毂的成型工艺。  All experiments were carried out in geometrically similar vessels with diameters of 0. 287m,0. 495m and 1. 100m respectively. Bubble size distributions were measured by a dual electric conductivity probe in upper,lower circulation regions and impeller region in the tanks. The distributions of local bubble size in the tanks have been studied,and a better understanding of the mechanism of gasliquid dispersion process is given. The effects of operationg conditions(such as agitated power consumption per unit liquid... All experiments were carried out in geometrically similar vessels with diameters of 0. 287m,0. 495m and 1. 100m respectively. Bubble size distributions were measured by a dual electric conductivity probe in upper,lower circulation regions and impeller region in the tanks. The distributions of local bubble size in the tanks have been studied,and a better understanding of the mechanism of gasliquid dispersion process is given. The effects of operationg conditions(such as agitated power consumption per unit liquid volume and gas superficial velocity) and the scale of the vessels on the bubble size have been studied,and the correlation equations for the bubble size in the upper and impeller regions were proposed. The scaleup rule of gasliquid stirred vessels was dicussed,then some proper scaleup methods were proposed. The experimental results are of value in the design and scaleup of aerated stirred vessels.  在槽径分别为Φ０．２８７ｍ、Φ０．４９５ｍ、Φ１．１００ｍ三个几何相似的搅拌槽内，采用双电导探针法测定了搅拌槽内上、下循环区及叶轮区的气泡尺寸分布，研究了单位液体体积搅拌功率、表现气速及搅拌槽放大过程对气泡尺寸的影响规律以及气泡尺寸的空间分布规律，并得到了相应的经验关联式，为气－液搅拌槽的设计放大提供参考。   << 更多相关文摘 
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