Study on Fluidic Thrust Vectoring Techniques for Application in V/STOL Aircrafts

Jain, Samarth; Roy, Soumya; Gupta, Dhruv; Kumar, Vasu; Kumar, Naveen

doi:10.4271/2015-01-2423

Cited by 10 publications

(6 citation statements)

References 36 publications

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“…From our study, ESBLs detected among 3 rd generation cephalosporin resistant gram negative bacteria was found to be 79%. High percentage of ESBL s were reported by Jain Amitha et al (86%) 6 and Rodrigues et al (53%) 7 . Of the total 79 ESBL positive isolates majority was from blood sample (38%) followed by urine (25%).…”

Section: Discussionsupporting

confidence: 48%

Comparative analysis of detection methods of Extended Spectrum Beta Lactamases in Gram Negative clinical isolates with special reference to their Genotypic Expression

P¹,

Shabina²,

S³

et al. 2014

JIMD

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Abstract:Antibiotic resistance in gram negative bacteria is increasing worldwide in both outpatients as well as hospitalized patients. Most bacterial isolates carry resistance determinants for extended spectrum beta lactamases (ESBL) production on plasmids that can easily spread from organism to organism. This study was conducted to compare the rate of detection of ESBL positive organisms by different methods, to use the clinical and laboratory standard institute (CLSI) detection methods for detecting ESBLs in bacteria other than Enterobacteriaceae and genotypic characterization of these ESBL strains. A total of 100 non repetitive gram negative isolates, which were resistant to ceftriaxone, cefotaxime or ceftazidime were only included in the study. All the 100 screen test positive isolates were tested for ESBL production using the different phenotypic detection methods. Molecular characterization of the strains was done at the Rajiv Gandhi Centre for Biotechnology, Trivandrum. Among total 100 gram negative isolates which were 3 rd generation cephalosporin resistant, 79(79%) were ESBL positive by using CLSI phenotypic confirmatory test. Of this 79%, majority of isolates were detected in blood samples (38%). Of the different methods employed, E-test detected additional 3% and 11% ESBL positive Escherichia coli and Klebsiella pneumoniae respectively. CLSI phenotypic confirmatory test also detected ESBL positive Pseudomonas sp, Acinetobacter sp and Enterobacter cloacae. The genotype characterization of 52 isolates showed 29 with CTX-M and 13 with TEM genes. Thus, the study shows a significant rate of ESBL production in gram negative bacteria emphasizing the need for enhanced infection control and antibiotic stewardship programs to limit the spread of these organisms.

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Section: Discussionsupporting

confidence: 48%

Comparative analysis of detection methods of Extended Spectrum Beta Lactamases in Gram Negative clinical isolates with special reference to their Genotypic Expression

P¹,

Shabina²,

S³

et al. 2014

JIMD

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“…Coanda effect is the adhesion of a high speed jet to a convex surface. Coanda effect is essentially utilized in aerospace applications [5], heating/cooling [6] and marine technology [7]. There are three alternative nozzle configurations for the utilization of Coanda surfaces: Newman setup [4] with only one jet next to the convex surface, Juvet setup [8] with two primary jets and a control jet and HOMER nozzle setup [1] composed of two inlets, two Coanda surfaces, one pintle to separate and smoothly direct these jets and a converging-diverging nozzle to enclose whole components.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and numerical verification of Coanda effect on curved surfaces using co-flow thrust vectoring

Kara

Erpulat

2021

International Advanced Researches and Engineering Journal

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In this study, a popular co-flow thrust vectoring system, which is superior to typical Coanda nozzles with one main jet, is examined experimentally and compared with 2D and 3D computational fluid dynamics results. High Speed Orienting Momentum with Enhanced Reversibility nozzle concept is the base design to proposed configuration which uses a control jet additional to the main jet for better and active enhancement on the flow vectoring and streamlined side-walls resulted in less flow blockage. This comparatively novel concept is utilized in an experimental setup to direct the thrust of aerial vehicles. The system includes two inlets (inlet1, inlet2) with different jet velocities and one pintle to separate and smoothly direct these jets and a converging-diverging nozzle to enclose these components. Experimental study is accomplished with four different configurations of inlet1 and inlet2 as 15 m/s and 10 m/s; 20 m/s and 10 m/s; 30 m/s and 10 m/s, and 45 m/s and 10 m/s, respectively. The tangential velocities on the curved surfaces are successfully measured utilizing a micro-manometer (Pitot tube) so that attachments/detachments of jets on the exit walls and deflection angles are calculated for each inlet velocities. The current experimental study also revealed that 3D assumption of computational fluid dynamics of Coanda effect is highly accurate and deflection angle results are not far from experimental results with the average deficit of only 5.44 %. As the result, 3D verification study resembles to experimental study in terms of deflection angles for all configurations.

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“…From these techniques, SITVC is the most straightforward and effective technique of FTV [5,6]. Since the 1960s, SITVC has been used successfully and is achieved by the injection of secondary fluid at the divergent part of the nozzle to the supersonic flow inside.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Influence of Injection Location, Injection Angle, and Divergence Half Angle on SITVC Nozzle Flow Field

Noaman

Khalil

2019

International Journal of Aerospace Engineering

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A numerical study has been performed to characterize the nozzle flow field of secondary injection thrust vector control (SITVC) and to estimate the performance parameters of SITVC. After validating the CFD turbulence models with an experimental data, a numerical simulation has been conducted in order to investigate the influence of changing the injection location, the injection angle, and the primary nozzle divergence half angle on the SITVC nozzle flow field structure and on the SITVC performance parameters. The secondary mass flow rate was kept constant for all cases during the simulation. The results showed that downstream injection near the nozzle exit Mp=2.75 increases the high-pressure zone upstream the injection leading to an increase in the side force; also, the higher divergence half angle 15° slightly increases the side force and it provides a wide range of deflection without shock impingement on the opposite wall becoming more effective for SITVC. The injection angle in the upstream direction 135° increases the side force, and by decreasing the injection angle to downstream direction 45°, the side force decreases. However, the SITVC performance parameters and the flow field structure are more influenced by the injection location and the primary nozzle divergence half angle while being less influenced by the injection angle.

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Study on Fluidic Thrust Vectoring Techniques for Application in V/STOL Aircrafts

Cited by 10 publications

References 36 publications

Comparative analysis of detection methods of Extended Spectrum Beta Lactamases in Gram Negative clinical isolates with special reference to their Genotypic Expression

Comparative analysis of detection methods of Extended Spectrum Beta Lactamases in Gram Negative clinical isolates with special reference to their Genotypic Expression

Experimental investigation and numerical verification of Coanda effect on curved surfaces using co-flow thrust vectoring

Numerical Simulation on the Influence of Injection Location, Injection Angle, and Divergence Half Angle on SITVC Nozzle Flow Field

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