تکامل کمپرسورهای سانتریفوژ

Centrifugal Compressor Evolution

 

تکامل کمپرسورهای سانتریفوژ

 

این مقاله به پیشرفت های صورت گرفته در 50 سال اخیر در خصوص روش های طراحی، تحلیل و ساخت کمپرسورهای سانتریفوژ می پردازد. این مقاله نمایی از تاریخچه این بخش ها ارایه می دهد و توضیح می دهد که دیگر  نوآوری های تکنولوژیک در پیشرفت های آیرودینامیک و عملکرد توربوماشین های مدرن نقش داشته اند.

Download Link:

Centrifugal Compressor Evolution
حجم: 6.07 مگابایت

 

CFD comparison with centrifugal compressor measurements on a wide operating range

CFD comparison with centrifugal compressor measurements on a wide operating range

 

به دلیل راندمان بالا کمپرسورهای سانتریفوژ به صورت گسترده ای در مصارف صنعتی استفاده می گردند. این کمپرسورها می توانند  درگستره وسیعی نقاط کاری عمل کنند. در این مقاله نتایج آزمون عملکرد کمپرسور با نتایج حاصل از دینامیک سیالات محاسباتی مقایسه می گردد.

Download Link:

CFD comparison with centrifugal compressor measurements on a wide operating range
حجم: 1.75 مگابایت

CFD Analysis of Off-design Centrifugal Compressor Operation and Performance

CFD Analysis of Off-design Centrifugal Compressor

Operation and Performance

 

 

Abstract

Mathematical modelling

This paper presents some of the results from a Master’s thesis research into the performance and operation of a centrifugal compressor at off-design operating conditions using advanced computational fluid dynamics (CFD) techniques. ANSYS CFX is the CFD solver used in this blind study to evaluate the ability of modern CFD software to predict the performance of centrifugal compressors operating at highly complex flows regimes.

The off-design cases considered included compressor operations at 60%, 70%, 80%, 90%, 100% and 105% of the on-design rotational speed. Speed lines were generated for each case and compared to experimental measurements. The predicted results were found to match very closely with the experimental measurements.

The flow within the centrifugal compressor stage was also examined by considering various performance parameters and making use of three-dimensional flow visualizations. This allowed for a better understanding of the fluid behavior within the centrifugal compressor.

Lastly, the benefits of unsteady (time accurate) simulation on centrifugal compressor performance predictions were investigated. The results obtained showed that unsteady simulations noticeably improve the accuracy of the compressor performance predictions.

 

Download Link:

CFD Analysis of Off-design Centrifugal Compressor Operation and Performance
حجم: 1.32 مگابایت

 

A Vision And Mission For Pump R&D Over The Next 25 Years

 

A Vision And Mission For Pump R&D Over The Next 25 Years

 

چشم اندازها و ماموریت ها برای تحقیق و توسعه پمپ ها در 25 سال آینده

 

- تصویر فوق از متن مقاله می باشد.

در این مقاله به چشم اندازهای در نظر گرفته شده و ماموریت واحد های تحقیق توسعه پمپ ها در 25 سال آینده پرداخته می شود.

Download Link:

A Vision And Mission For Pump R&D Over The Next 25 Years
حجم: 403 کیلوبایت

Numerical Prediction Of Cavitation In Pumps

Numerical Prediction Of Cavitation In Pumps

 

ABSTRACT
With the increase in power per unit of volume for modem pumps, driven by manufacturing costs reduction, cavitation becomes more arid more the main limiting factor in pump design. The classical one-dimensional design rules applied for decades are no longer sufficient, and for this reason, there is a strong need for more accurate numerical tools to predict the cavitation behavior of pumps.
An original cavitation prediction method is presented and its results are compared to experimental data for five pumps of specific speeds from 15 to 125 (775 to 6500 US units). The numerical method introduced in this paper for the prediction of the cavitation development in pumps is a simplified version of a previously developed program successfully used in similar cases. Motivation for this simplification was to allow the program usage during the design process of suction impellers. The accuracy of this simplified method as well as its usage as a design tool is discussed. 

Download Link:

Numerical Prediction Of Cavitation In Pumps
حجم: 687 کیلوبایت

Computational Fluid Dynamical Analysis Of Complex Internal Flows In Centrifugal Pumps

Computational Fluid Dynamical Analysis Of Complex Internal Flows In Centrifugal Pumps

 

ABSTRACT 

A commercial computational fluid dynamics (CFD) computer code was employed to compute the flow field from 105 percent down to 21. percent of the 4525 gpm BEP flow rate of a 1785 rpm, 1500 specific speed impeller of 13,000 suction specific speed. Suction and discharge recirculation were both computed, and the results agreed in all details that have also been observed experimentally. The insights gained from these computations led to the design and construction of a new impeller aimed a smoother minimum flow operation. The same code was then applied to the computation of the highly three-dimensional flow field of the diffusing crossover of a 325 gpm, 3580 rpm, 900 to 1000 specific speed multistage volute pump. Flow distortions produced by this crossover were computed at the outlet to the impeller of the succeeding stage, and the effects on performance were estimated. Candidate improvements to the crossover were evaluated with the same code, illustrating the utility of CFD as a design and improvement tool. This tool can be used to improve pump performance and reliability in many different areas. 

Download Link:

Computational Fluid Dynamical Analysis Of Complex Internal Flows In Centrifugal Pumps
حجم: 369 کیلوبایت

Effect of Secondary Flows on Heat Transfer of a Gas Turbine Blade

تاثیر جریانهای ثانویه بر انتقال حرارت پره توربین گاز

دریافت فایل

Effect of Secondary Flows on Heat Transfer of a Gas Turbine Blade
حجم: 3.78 مگابایت

تحلیل دینامیک سیالات محاسباتی (CFD) پره در حال ارتعاش توربین

تحلیل دینامیک سیالات محاسباتی (CFD) پره در حال ارتعاش توربین

دریافت فایل

Computational Fluid Dynamic Analysis of a Vibrating Turbine Blade
حجم: 4.18 مگابایت

مدل CFD برهم کنش سازه – سیال برای آب بندهای توبوماشینها و سیستم خروجی توربین گاز

مدل CFD برهم کنش سازه – سیال برای

 آب بندها و سیستم خروجی در توربین گاز

دریافت فایل

CFD-based Fluid-Structure Interaction Models
حجم: 2.82 مگابایت

بررسی عددی ارتعاشات ناشی از طراحی هیدرولیکی در جمع کننده پمپهای سانتریفوژ با در نظر گرفتن مقادیر مختلف عرض خروجی پروانه

بررسی عددی ارتعاشات ناشی از طراحی هیدرولیکی در جمع کننده پمپهای سانتریفوژ با در نظر گرفتن مقادیر مختلف عرض خروجی پروانه 

دریافت فایل

Numerical Research on Hydraulically Generated Vibration and Noise of a Centrifugal Pump Volute with Impeller Outlet Width Variation
حجم: 5.2 مگابایت