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RISS 인기검색어
- 검색키워드
- 저자 : Ashima Malhotra (검색결과 2 건)
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Ashima Malhotra,Vikas Gupta,Mary Abraham,Pankaj Punetha,Yashpal Bundela 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.2
Study Design: Prospective, randomised controlled, single centre study of 45 patients posted for two level lumbar fixation surgery in the prone position. Purpose: To compare intra-abdominal pressure (IAP), mean airway pressure mean airway pressure and blood loss during the spine surgery in prone position using three different positioning systems. Overview of Literature: Studies have correlated IAP with the amount of perioperative bleeding. However, IAP and airway pressures while assessing the bleeding comparing two or more prone positioning systems are unclear. Methods: This prospective study was conducted on a cohort of 45 patients scheduled for two-level lumbar fixation. Patients were randomly allocated to a spine table, Wilson’s frame, and thermomodulated pads. Bladder pressure as an indicator of IAP, mean and peak airway pressures, and blood loss were monitored. Results: IAP increased whenever patient position was changed to prone .The increase in pressure was more in the Wilson’s frame group but was statistically significant only on prolonged positioning. Adopting the prone position always increased the mean airway pressure, but the increased was significant only in the Wilson’s frame group. Mean airway pressure decreased in the spine table group and was statistically significant. The blood loss in the spine table group was significantly less as compared to the other groups. Conclusions: Positioning on a spine table results in less blood loss and low mean airway pressure. The Wilson’s frame results in high IAP, increased mean airway pressure, and more blood loss. The thermomodulated frame increases mean airway pressure and produces a moderate increase in IAP and airway pressure.
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Impact of surface roughness on gas turbine engine fan and compressor rotor
Ashima Malhotra,Shraman Goswami,A. M. Pradeep 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.5
A gas turbine engine, being an open cycle engine, gets exposed to atmospheric conditions through the intake of air from the surroundings. Debris of different sizes comes into the engine through the fan inlet and impinges on the different components inside the engine, making them rough. Another source of roughness is encountered with the manufacturing process itself. Hence it is important to understand the impact of surface roughness on the performance of either an engine in the field or a newly designed engine. The current work focuses on the performance impact of surface roughness on a fan rotor and a compressor rotor. The flow field is numerically studied with and without roughness. The flow field of a fan rotor is generally different from a compressor rotor, specifically in terms of shock structure and secondary flow, and hence a comparative study is made to understand the impact of roughness in presence of different flow fields. The NASA rotor67 (fan rotor) and the NASA rotor37 (compressor rotor) are used for the numerical study carried out for this work. The results indicate that the extent of performance loss is more for compressor rotor (NASA rotor37) for same amount of roughness used on fan and compressor rotor. A detailed flow field investigation from the numerical study is presented to understand the reason behind the different extents of performance loss. It is found that not only the amount of roughness but also the flow field plays a significant role on the performance of a gas turbine engine fan and compressor rotor.
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