دانلود رایگان مقاله الزویر درباره اثرات سرعت چرخشی و قطر پروانه موتور بر کارايى کارکرد پمپ توربین (کلیک کنید)
توضیحات :
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مشخصات این مقاله :
عنوان مقاله :
Effects of impeller diameter and rotational speed on performance of pump running in turbine mode
ترجمه فارسی عنوان :
اثرات سرعت چرخشی و قطر پروانه موتور بر کارايى کارکرد پمپ در حالت توربین
سال انتشار : 2015
متعلق به مجله یا ژورنال : مدیریت و تبدیل انرژی (Energy Conversion and Management)
فرمت: PDF
تعداد صفحات: 17
شماره پروژه: 5003
کلمات کلیدی :
Impeller diameter, Part load, Pump running in turbine mode, Rotational speed
قطر پروانه موتور، فشار قطعه، عملکرد پمپ در حالت توربین، سرعت چرخشی
چکیده :
Abstract
The major limitations of mini/micro hydropower schemes is the higher cost of small capacity hydro turbines. Also, it is very cumbersome, time consuming and expensive to develop the site specific turbines corresponding to local site conditions in mini/micro hydro range. In such plants, small centrifugal pumps can be used in turbine mode by running in the reverse direction. The efficiency of pump as turbines (PATs) is usually lower than the conventional hydro turbines; however, there may be substantial decrease in the capital cost of the plant.
Hydropower plants usually runs at part load for several months in a year due to insufficient water availability for the power generation. The application range of PAT can be widened if its part load and/ or maximum efficiency can be improved. In the present study, experimental investigations are carried out on centrifugal pump running in turbine mode to optimize its geometric and operational parameters e.g. impeller diameter and rotational speed. The experiments were performed in the wide range of rotational speeds varying from 900 to 1500 rpm with original (£ 250 mm), 10% trimmed (£ 225 mm) and 20% trimmed (£ 200 mm) impellers. Impeller trimming led to improvement in efficiency at part load operating conditions. The performance of PAT was found better at the lower speeds than that at the rated speed. The effects of blade rounding were studied in all the cases and it led to 3–4% rise in efficiency at rated speed with the original impeller. The empirical correlation is also developed for prediction of efficiency in terms of impeller diameter and rotational speed in non-dimensional form.
مقدمه مقاله کارايى کارکرد پمپ توربین :
Introduction
Hydropower is probably the oldest and most reliable source of energy on the earth. Large hydropower plants require construction of large scale dams, long-term investments, extensive and time consuming construction processes. The reservoir behind the dam can flood enormous valuable agricultural lands and agricultural activities [1]. These factors make large hydropower plants unfavorable in many cases. Nevertheless, small hydropower plants (SHP) are free from such issues and provide option of decentralized power generation particularly in remote, rural and hilly areas.
In India, the plants having overall capacity up to 25MW are called small hydropower plants. The SHP is further categorized as pico (below 5 kW), micro (5.1–100 kW) and mini (101 kW to 2 MW) hydropower [2]. Application of micro hydropower plants has gained worldwide attention during the last decades of the 20th century [3]. Although Micro hydropower plants are by no means comparable to large hydropower projects as far as their power generation capacity is concerned; however, their simple design and relatively simple manufacturing processes, low price per kilo watts, easy installation with simple construction, cheap and easy maintenance and their insignificant or rather non-riverine impacts have made them attractive particularly to the countries with abundant micro hydro potential [1].
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