Numerical analysis on overall performance of Savonius turbines adjacent to a natural draft cooling tower

Goodarzi, M.; Keimanesh, Reza

doi:10.1016/j.enconman.2015.04.027

Cited by 34 publications

(13 citation statements)

References 28 publications

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“…The initially straight and parallel streamlines featuring the upstream flow are distorted due to the invasion of the rotor surface. The numerical result obtained here is similar to that documented in [25]. Additionally, with such a rotor orientation with respect to the upstream flow, a large torque coefficient is predictable; the contribution of the advancing blade is predominant for the torque production.…”

Section: Fundamental Flow Characteristics Of the Savonius Rotorsupporting

confidence: 76%

Upstream Flow Control for the Savonius Rotor under Various Operation Conditions

et al. 2018

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Applications of the Savonius rotor have been extended in recent years, necessitating an in-depth investigation on flow characteristics of such a fluid energy converting device. For the wake flow downstream of the Savonius rotor, studies have been reported extensively. Nevertheless, literature specifically devoted to the upstream flow of the Savonius rotor can rarely be found. This review collects and compiles findings from relevant studies to prove the significance of upstream flow patterns to the operation of the Savonius rotor. Then attempts from experimental and numerical aspects to substantiate the important effect of the upstream flow are implemented. Based on practical cases and laboratory works, upstream flow patterns for the Savonius rotor are divided into four types, namely uniform flow, guided flow, rotor wake flow and oscillating flow. Accordingly, conditions under which these upstream flow patterns arise are analyzed respectively. Experimental and numerical results are presented to clarify the influential factors underlying diverse upstream flow patterns. Furthermore, the relationship between the performance of the Savonius and the upstream flow is elucidated, facilitating the development of techniques of controlling the upstream flow. This review provides a systematic reference for the control of the upstream flow for the Savonius rotor, which has the tendency of developing into an independent technical branch.

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Section: Fundamental Flow Characteristics Of the Savonius Rotorsupporting

confidence: 76%

Upstream Flow Control for the Savonius Rotor under Various Operation Conditions

et al. 2018

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“…Hence, a large number of researches have been carried out in order to improve operational performance of engineering systems such as power systems, hybrid energy systems, diesel engines and data storage systems [22] through experiments or mathematical modeling. In particular, a large number of research efforts have been carried out in order to improve operational performance of the natural draft dry cooling towers under crosswind conditions by using different procedures such as radiator-type windbreakers [23], alternative shell geometry with elliptical cross section, and Savonius turbines adjacent to cooling towers [24].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on thermal performance of natural draft wet cooling towers employing an innovative wind-creator setup

Alavi

Rahmati

2016

Energy Conversion and Management

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“…The heat and mass transfer processes in different types of cooling towers have been subject of extensive scientific research. These studies include experimental and numerical investigations of thermal and hydraulic performance of mechanical air draft wet cooling towers with counterflow [5], parallelflow [6], and crossflow arrangements [7,8], as well as natural air draft dry cooling towers with adjacent Savonius turbines [9], solar preheating of the airflow [10], water redistribution systems [11], water systems with vertical and horizontal spray nozzles [12]. All of these solutions aim to increase the cooling tower efficiency.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat and Mass Transfer Inside a Wet Cooling Tower

Blecich

Wolf

2018

Teh. glas. (Online)

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This paper presents a numerical investigation of heat and mass transfer inside a wet cooling tower with forced air draft, which find application in energy process industries and oil refineries. The mathematical model consists of mass, momentum and energy conservation equations, water droplet trajectories and their interaction with the gas phase, the computational domain and boundary conditions. Numerical distributions of air velocity, air temperatures, water vapor fractions and evaporation rates are shown and discussed. The wet cooling tower achieves an efficiency of around 80%, which can be improved by optimizing the value of the water droplet size, nozzle spray angle and water-to-air flow rate ratio. The water droplet size has a dominant effect on the cooling tower efficiency, whereas small droplets improve the efficiency up to 10%. On the other hand, the spray angle and the water-to-air ratio lead to slight improvements, about 2-3% in the best case.

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Numerical analysis on overall performance of Savonius turbines adjacent to a natural draft cooling tower

Cited by 34 publications

References 28 publications

Upstream Flow Control for the Savonius Rotor under Various Operation Conditions

Upstream Flow Control for the Savonius Rotor under Various Operation Conditions

Experimental investigation on thermal performance of natural draft wet cooling towers employing an innovative wind-creator setup

Numerical Investigation of Heat and Mass Transfer Inside a Wet Cooling Tower

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