Resonance Identification For Impellers

Resonance Identification For Impellers 

تشخیص رزنانس در پروانه ها

تصویر فوق مربوط به متن مقاله می باشد.

قابلیت اطمینان اکثر قطعات در کمپرسورهای سانتریفوژ به قابلیت اطمینان پروانه ها وابسته است. در اکثر موارد آسیب دیدگی پروانه ها موجب خستگی مکانیکی می گردد. این خستگی معمولا در پره ها، دیسک و بدنه پروانه مشاهده می گردد. یکی از عوامل ایجاد این خستگی ها ناشی از ارتعاشات و نیروهای ناشی از تحریک فرکانس طبیعی می باشد. این مقاله به بررسی این موارد با استفاده از تحلیل المان محدود می پردازد.

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Resonance Identification For Impellers
حجم: 3.55 مگابایت

Material Selection for sea water pump

Material Selection for sea water pump 

انتخاب جنس قطعات برای پمپ های آب دریا

 

انتخاب جنس مناسب برای پمپ های آب دریا بستگی به عوامل زیادی مانند کیفیت آب دریا، شرایط فرآیندی مورد نیاز، هزینه و امکان استفاده از ماده مورد نظر دارد. دراین مقاله به بررسی این .موارد و ارایه پیشنهاد در خصوص جنس مناسب برای پمپ های آب دریا  پرداخته می شود.

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Material Selection for sea water pump
حجم: 2.72 مگابایت

CFD Analysis of Flow through Compressor Cascade

CFD Analysis of Flow through Compressor Cascade

Abstract— This work aims at analyzing the flow behavior through a compressor cascade with the help of Computational Fluid Dynamics using the FLUENT software. An attempt has been made to study the effect of angle of attack or flow incidence angle on various flow parameters viz. static pressure, dynamic pressure, turbulence and their distribution in the flow field and predict the optimum range of angle of attack based on the above observations. Particularly, two principle parameters viz. the static pressure rise for the compressor cascade and the turbulence kinetic energy are considered in this analysis. It is observed that maintaining a slightly positive angle of flow incidence of +2 to +6 degrees is advantageous.

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CFD Analysis of Flow through Compressor Cascade
حجم: 1.36 مگابایت

Preview of API 610 12th Edition

بررسی نکات مهم ویرایش 12 استاندارد API610 و تفاوت های آن با ویرایش 11

این مقاله توسط   Roger L. Jonesرییس کمیته تدوین استاندارد API610 و  Frank Korkowskiمدیر بازاریابی بخش آموزش شرکت Flowsever در سی امین سمپوزیسیوم بهره برداران پمپ و چهل و سومین سپوریسیوم توربوماشین در سال 2014 در تگزاس امریکا ارایه شده است. در این مقاله مروری بر نکات بر جسته استاندارد API 610 12 Ed. انجام شده است. این ویرایش استاندارد API 610 به زودی توسط موسسه API منتشر خواهد گردید.

این مقاله را می توانید از لینک زیر دریافت نمایید:

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حجم: 465 کیلوبایت

Panel Discussion on Inducer Design Criteri

Panel Discussion on Inducer Design Criteria

معیار های طراحی ایندیوسر

This article reports a panel discussion titled Inducer Design Criteria presented at the 9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC-9). The presentations of the panelists and the subsequent discussions are summarized. It is shown that cavitation instabilities are major problems in modern turbopumps and that design criteria to eliminate them are needed. Available design methods for inducers and marine propellers are reviewed, and new criteria to enhance stability are proposed. The current status of CFD is reviewed and an example of successful application is shown. Discussions of several specific topics are reported and future research needs are noted.

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Panel Discussion on Inducer Design Criteria
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Optimization of Vane Diffuser in a Mixed-Flow Pump for High Efficiency Design

Optimization of Vane Diffuser in a Mixed-Flow Pump 

for High Efficiency Design

Abstract

This paper presents an optimization procedure for high-efficiency design of a mixed-flow pump. Optimization techniques based on a weighted-average surrogate model are used to optimize a vane diffuser of a mixed-flow pump.

Validation of the numerical results is performed through experimental data for head, power and efficiency. Three-level full factorial design is used to generate nine design points within the design space. Three-dimensional Reynoldsaveraged Navier-Stokes equations with the shear stress transport turbulence model are discretized by using finite volume approximation and solved on hexahedral grids to evaluate the efficiency as the objective function. In order to reduce pressure loss in the vane diffuser, two variables defining the straight vane length ratio and the diffusion area ratio are selected as design variables in the present optimization. As the results of the design optimization, the efficiency at the design flow coefficient is improved by 7.05% and the off-design efficiencies are also improved in comparison with the reference design.

Keywords: Mixed-flow pump, Impeller, Vane diffuser, Efficiency, Optimization, Weighted-average surrogate model.

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Optimization of Vane Diffuser in a Mixed-Flow Pump for High Efficiency Design

Size: 606 KB

Design and CFD Analysis of Centrifugal Pump

Design and CFD Analysis of Centrifugal Pump

Abstract— the purpose of this paper is to identify /observe and determine the pattern of velocity profile and pressure distribution by using CFD simulation program after the 3D design and modeling of the pump is made using Vista CPD. Basically, this paper revolves around the idea of investigating the effect and distribution of velocity profile and pressure within a pump having the following specification, Head = 20 m, Flow rate = 280 m3/hr, and RPM = 1450. 3D Navier–Stokes equations were solved using ANSYS CFX.

The standard k -e turbulence model was chosen for turbulence model. From the simulation results it was observed that the pressure increases gradually from impeller inlet to outlet. The static pressure on pressure side is evidently larger than that on suction side at the same impeller radius. In addition to this, it was observed that, the velocity increases from impeller inlet until it enters the volute casing. It then drops to a minimum value at outlet region.

 

Keywords— Centrifugal pump design, CFD Analysis, Simulation, ANSYS CFX, Vista CPD, pressure distribution, CFD-Tool.

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Design and CFD Analysis of Centrifugal Pump
Size:786 KB

CFD Simulation of Centrifugal Pump Impeller Using ANSYS-CFX

CFD Simulation of Centrifugal Pump Impeller Using 

ANSYS-CFX

ABSTRACT: Centrifugal pumps are a most commonly used in different fields like industries, agriculture and domestic applications. Computational Fluid Dynamics is most commonly used tool for simulation and analysis. 3-D numerical CFD tool is used for simulation of the flow field characteristics inside the turbo machinery. CFD simulation makes it possible to visualize the flow condition inside centrifugal pump. The present paper describes the head, power, efficiency and to evaluate the pump performance using the ANSYS CFX-14, a computational fluid dynamics simulation tool. These simulations of centrifugal pumps are strongly related to cavitation flow phenomena, which may occur in either the rotating runner-impeller or the stationary parts of the centrifugal pumps. The numerical simulation can be used to detect the cavitation in centrifugal pump and to get safe range of operating at different flow rate and rotating speed.

KEYWORDS: Centrifugal pump impeller, CFD, Head, Power, Efficiency, Cavitation.

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CFD Simulation of Centrifugal Pump Impeller
Size: 1.2 MB

Inducer Design That Avoids Rotating Cavitation

این مقاله جهت استفاده طراحان پمپ و علاقه مندان در بخش مقالات به اشتراک گذاشته شده است.

به بخش مقالات رجوع کنید.

Inducer Design That Avoids Rotating Cavitation

Abstract:

Rotating cavitation instabilities in inducers are often encountered in turbopumps of rocket engines even in the normal running conditions.

They impact on bearings radial loads, on pipe pressure oscillations and then decrease the engine reliability. The inducer presented here was designed with the goal to suppress these instabilities.