Search Results - "NPR"
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1
Development of bright and dark pulsed fiber laser based on nonlinear polarization rotation / Tiu Zian Cheak
Published 2015“…Besides the Q-switching operation, NPR technique is also explored to generate mode-locked, harmonic mode-locked, and multi-wavelength mode-locked. …”
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2
Passive control of base drag employing dimple in subsonic suddenly expanded flow
Published 2018“…From the present investigation, it was found that dimples as passive control is very effective at higher NPR and the wall pressure distribution too was quite stable at higher NPR. …”
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3
Studies on flow from converging nozzle and the effect of nozzle pressure ratio for area ratio of 6.25
Published 2014“…The flow parameter, nozzle pressure ratio (NPR) used were from 1.5 to 3, in steps of 0.5 and experiments were conducted for NPR 1.5, 2.0, 2.5 and 3.0. …”
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4
Investigation of efficacy of low length-to-diameter ratio and nozzle pressure ratio on base pressure in an abruptly expanded flow
Published 2018“…The L/D ratio of the enlarged duct considered was from 10 to 1 and experiments were conducted for Nozzle Pressure Ratio (NPR) from 3 to 11. Since the jets Mach numbers are high and the highest NPR tested was 11 which imply that the flow remains over expanded, even though, with increase in the NPR, the level of over expansion will decrease. …”
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5
Passive control of base pressure with static cylinder at supersonic flow
Published 2018“…Static cylinder as a passive controller was found to reduce the base drag as high as 59 percent at NPR = 9 and 14 percent at NPR = 6. The base pressure depends on Mach number, area ratio, length to width ratio, and nozzle pressure ratio (NPR). …”
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6
How capital structure affects business performance in Chinese listed commercial banks
Published 2011“…The results for non-performing loan show that CR1 and CR5 do not significantly affect NPR. The characteristic of the largest shareholder correlates with neither ROE nor NPR, the proportion of circulating stock affects business performance significantly. …”
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7
Counter clockwise rotation of cylinder with variable position to control base flows
Published 2018“…The experiments were carried out for NPR 2, 3, 6, 7.8 and 8.5. Cylinder when rotated counter clockwise as an active controller were found to reduce the base drag as high as 62 percent at NPR 8.5 when located near to duct wall and 50 percent when located away from duct wall for the same NPR. …”
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8
Influence of expansion level on base pressure and reattachment length
Published 2019“…The Mach numbers considered for CFD analysis are 1.5, 2.0 and 2.5. NPR and the L/D ratios of the study are from 2, 5, and 8. …”
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9
Toxic Gas Dispersion Model Based On Neural Pattern Recognition Networks
Published 2022“…To achieve the objectives, two phases of structure architecture of NPR is carried out. First, NPR development is developed using three different algorithms which are Levenberg-Marquart (LM), Bayesian Regularization (BR) and Scaled Conjugated Gradient (SCG) to propose the best network algorithm using 70% training and 10-28 hidden neurons. …”
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10
Combined effect of nozzle pressure ratio and screech prone supersonic mach number in a suddenly expanded flow
Published 2015“…The Length to Diameter ratio of the suddenly expanded duct was varied from 10 to 1 and experiment were conducted for Nozzle Pressure Ratio (NPR) from 3 to 11. Jets were over, under, and correctly expanded depending upon the NPR of the respective runs. …”
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11
Numerical simulation of suddenly expanded flow at Mach 2.2
Published 2019“…NPR's of the present study is such that the flow mostly remained over expanded. …”
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12
Studies on flow from convergent nozzle with sudden expansion and control effectiveness under the influence of micro jets
Published 2013“…Accordingly, Tests are conducted for NPR in the range of 1.5 to 3.0, in the steps of 0.5. …”
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13
New Parameter Reduction of Soft Sets
Published 2012“…The most recent concept of Normal Parameter Reduction (NPR) is introduced, which overcomes the problem of suboptimal choice and added parameter set of soft sets. …”
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14
Control of suddenly expanded flow at low supersonic Mach numbers
Published 2015“…Experiments were conducted for nozzle pressure ratio (NPR) from 3 to 11. The L/D ratio of the enlarged duct was varied from 10 to 1, and results are presented for L/D 4, 3, 2, and 1. …”
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15
Effect of mach number in a suddenly expanded flow for area ratio 4.84
Published 2012“…The nozzle pressure ratio (NPR) used is from 3 to 11, in steps of 2 and experiments are conducted for NPR 3, 5, 7, 9, and 11 for all the Mach numbers. …”
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16
Control of suddenly expanded flow for area ratio 3.61
Published 2013“…The nozzle pressure ratio (NPR) used were from 1.5 to 3, in steps of 0.5 and experiments were conducted for NPR 1.5, 2.0, 2.5 and 3.0. …”
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17
Determination of wall pressure flows at supersonic Mach numbers
Published 2020“…When the nozzles are ideally expanded the oscillations are absent as at this NPR only the Mach waves will be present. Similar trends are also seen at NPR 3 as well as whenever there is an adverse pressure gradient at Mach 2. …”
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18
Effect on base pressure in suddenly expanded flows with variable location of microjets
Published 2012“…As high as 70 percent increase in base pressure was achieved for Mach number 2.58 at NPR 11 when the micro jets are placed at the base as well as the duct.…”
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19
Effect of level of expansion and inertia level in a suddenly expanded flow
Published 2015“…The Length to Diameter ratio of the suddenly expanded duct is varied from 10 to 1 and experiments are conducted for Nozzle Pressure Ratio (NPR) from 3 to 11. Since the jets remain over expanded for all the NPRs of the present study, even though, with increase in the NPR, the level of over expansion will decrease. …”
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20
Experimental investigation of the base flow and base pressure of sudden expansion nozzle
Published 2018“…From the results it is observed that for NPRs 3 there is no appreciable gain in the base pressure, and hence control employed in the form of micro jets is not effective for this NPR, however, at NPR 5, there is significant change in the base pressure values for all the area ratios. …”
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