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

 

مطالعه کاویتاسیون در پمپ های تزریق آب فشار بالا

 

Cavitation Study In A High Pressure Water Injection Pump

مطالعه کاویتاسیون در پمپ های تزریق آب فشار بالا

- منبع شکل فوق از متن مقاله می باشد.

پمپ های با انرژی بالا (High Energy) اغلب در سرعت های بالا و در طراحی های فشرده با تعداد طبقات کم کار می کنند. دراین پمپ ها می بایست به کاویتاسیون توجه ویژه ای کرد زیرا کاویتاسیون به سرعت پمپ وابسته است. در این مقاله مطالعه ای موردی در خصوص مشکل کاویتاسیون در پمپ های تزریق آب فشار بالا انجام شده است.

Download Link:

Cavitation Study In A High Pressure Water Injection Pump
حجم: 1005 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

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

بهینه سازی هیدرولیکی کمپرسورهای سانتریفوژ - GE Oil & Gas

Centrifugal compressors return channel optimization by means of

 advanced 3-D computational fluid dynamics

چکیده:

در صنایع نفت و گاز، نیاز به راندمان بالا باعث رشد مداوم فن آوری در این حوزه شده است. اگرچه ارتقاء طراحی پروانه به عنوان مساله ای رایج چه از نظر تئوری و چه از نظر عملی و صنعتی مورد توجه بوده است، اما اجزاء ثابت همانند استاتور در کمپرسورها به این اندازه در کانون توجه نبوده اند. دلیل این امر آن است که محفظه و کانالهای برگشتی ثابت نسبت به پروانه تاثیر کمتری بر روی عملکرد کلی کمپرسور دارند.با این وجود .....

دریافت
عنوان: ge centrifugal_compressors
حجم: 608 کیلوبایت