stall prevention
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Author(s):  
Sonali Kumar ◽  
Margaret A. Schmuhl

Violence against women (VAW) is a prevalent social problem within and outside of the home. This is particularly the case for women living in societies that promote patriarchal ideologies, such as India. Using content analysis and an integrative review approach, this study focuses on the following goals: 1) to examine the state and nature of the recent research available on VAW in India, 2) to understand the significant predictors and outcomes of such violence, 3) to synthesise and document the policy and prevention recommendations by scholars, and 4) analyse the barriers that justify or promote such behaviour and stall prevention efforts. The study criteria include articles published between 2014 and 2018, in English, those articles that have undergone original research in peer-reviewed journals and focused on VAW in India. A total of 49 studies were included and the results indicate that much of the research is quantitative in nature, demographic and familial factors were often identified as predictors of VAW in India, and VAW was often related to health-related outcomes. Further, various policy recommendations and barriers were identified by scholars examining VAW in India.<br /><br />Key messages<br /><ul><li>Research on VAW in India is often quantitative, cross-sectional, non-comparative in nature and limited to investigations of domestic violence, overlooking other types of research methods and violence women experience.</li><br /><li>Considering policy recommendations and barriers to address VAW in India, empowerment alone cannot result in long-lasting changes, gender-bias norms must evolve to address the issue of VAW in India.</li><br /><li>Future research on VAW in India should examine the experiences of such violence against vulnerable and marginalised populations such as sex workers, and sexual, religious and ethnic minorities.</li></ul>


2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Nobuyuki Yamaguchi ◽  
Masayuki Ogata ◽  
Yohei Kato

An improved construction of air-separator device, which has radial-vanes embedded within its inlet circumferential opening with their leading-edges facing the moving tips of the fan rotor-blades so as to scoop the tip flow, was investigated with respect to the stall-prevention effect on a low-speed, single-stage, lightly loaded, axial-flow fan. Stall-prevention effects by the separator layout, relative location of the separator to the rotor-blades, and widths of the openings of the air-separator inlet and exit were parametrically surveyed. As far as the particular fan is concerned, the device together with the best relative location has proved to be able to eliminate effectively the stall zone having existed in the original solid-wall characteristics, which has confirmed the promising potential of the device. Guidelines were obtained from the data for optimizing relative locations of the device to the rotor-blades, maximizing the stall-prevention effect of the device, and minimizing the axial size of the device for a required stall-prevention effect, at least for the particular fan and possibly for fans of similar light-load fans. The data suggest the changing internal flow conditions affected by the device conditions.


2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Nobuyuki Yamaguchi ◽  
Masayuki Ogata ◽  
Yohei Kato

The stall-prevention effect of air separators incorporating radial vanes in place of the existing axial vanes was investigated on a low-speed, single-stage, lightly loaded axial-flow fan for effective and compact air separators of a simplified structure. From the survey, paying attention to several geometrical dimensions of the device, the following conclusions are obtained: (1) Simplified radial vanes made of flat plates could show strong stall-prevention effect comparable to those of the curved-vane type one. The most favorable ones showed no stall up to the fan shut-off conditions. (2) Radial heights of the recirculation passage within the air separator showed significant influences on the stall improvement. It should be larger than some critical size experimentally given in the study. (3) The axial length of the device should be larger than some critical size given experimentally in the study. Too much reduced axial length could give rise to an abrupt loss in the effect. (4) The optimum axial locations of the rotor-tip blade leading edge within the device inlet opening were found to lie near the center of the width of the inlet opening from both aspects of stall improvement and fan efficiency.


Author(s):  
Giovanni Ferrara ◽  
Lorenzo Ferrari ◽  
Leonardo Baldassarre

Rotating stall in centrifugal compressors is an attractive topic both for academic research and industrial applications. Its complex phenomenology requires detailed and advanced analyses to improve the understanding of the physical mechanisms responsible for its development. From such an investigation, benefits can also come for the design of more efficiently performing industrial compressors. In this context, an activity was planned focusing on the comprehension and characterization of rotating stall for a group of industrial centrifugal stages with a low blade-outlet-width-to-impeller-radius ratio for very high pressure applications. These are generally equipped with vaneless diffusers. In order to improve stage stability, the use of low solidity vaned diffusers (LSD) seems to be a very useful approach. Starting from results obtained for a previous set of LSD, new sets of configurations were tested in order to analyze in detail the influence of vane solidity, inlet radius and incidence at design point on performance and design point. Results are compared with those of the vaneless solution highlighting improvements and drawbacks.


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