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Aerodynamics of a Tandem-Bladed Axial Compressor Rotor under Circumferential Distortion at Different Rotational Speeds

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Journal of Thermal Science 2024年第4期33卷 1340-1356页

作者： Amit KUmAR Jerry T.JOHN a.m.pradeep R.A.DAKKERmANS Dragan KOZULOVIC Department of Aerospace Engineering Indian Institute of Technology BombayMumbai400076India Department of Automotive and Aeronautical Engineering Hamburg University of Applied Sciences20099HamburgGermany Institute of Jet Propulsion Bundeswehr University Munich85577NeubibergGermany

For most aircraft engines,inflow distortion is *** distortion is known to degrade the aerodynamic performance and stable operating limits of a *** rotor configuration is an arrangement that effectively controls the growth of the boundary layer over the suction surface of the ***,a higher total pressure rise can be achieved through this unconventional design approach involving the splitting of the blade into forward and aft *** is expected that the effect of inlet flow distortion would be more severe for a tandem-rotor design due to the greater flow turning inherent in such ***,this aspect needs to be thoroughly *** present study discusses the effect of circumferential distortion on the tandem-rotor at different rotational ***-annulus RANS simulations using ANSYS CFX are used in the present *** performance of the rotor at a particular flow coefficient and different rotational speeds is *** total pressure and efficiency are observed to drop at lower mass flow rates under the influence of circumferential *** loss region in each blade passage is mainly associated with the blade wake,tip leakage vortex,secondary flow,and boundary ***,their contribution varies from passage to passage,particularly in the distorted *** the lower span,the wake width is found to be higher than that at a higher *** to the redistribution of the mass flow,the circumferential extent reduces at a higher *** the undistorted sector,the strength of the tip leakage vortex is significantly higher at the design rotational speed than at lower *** distortion near the tip region promotes an early vortex breakdown even at the design operating *** adversely affects the total pressure,efficiency,and stall *** clean flow conditions,this phenomenon is only observed near the stall *** the design operating condition,the breakdown of the forward rotor tip l

关键词： tandem rotor circumferential distortion loss tip leakage vortex vortex breakdown diffusion factor aerodynamics of compressor blade

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Experimental investigation of tandem rotor under clean and radially distorted inflows

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Propulsion and Power Research 2021年第3期10卷 247-261页

作者： Amit Kumar a.m.pradeep Department of Aerospace Engineering Indian Institute of Technology BombayMumbai400076India

With increasing emphasis on renewable sources of energy,the gas turbine engine faces several challenges in evolving its design,to remain *** is one of the main components,which accounts for one-third of the engine *** designers have been exploring different ideas to achieve maximum pressure rise with minimum number of stages *** blading is one such novel design that has demonstrated higher diffusion capability than a single rotor blade.A single blade,with a higher diffusion factor,carries the risk of flow separation against the adverse pressure gradient of the compressor *** the tandem blading concept,a single blade is split into forward and aft *** gap that is created between the forward and aft blade,serves as a mechanism to energize the sluggish flow over the aft blade suction surface,which in turn helps in mitigating the flow *** present experimental work is aimed at exploring the feasibility of a tandem rotor in an axial flow compressor under the clean and radially distorted *** and unsteady experimental results of the tandem rotor are included in this *** stage performance characteristics,variation of total pressure,flow coefficient,and exit flow angle along the blade span for clean and distorted flow is included in this *** results of a steady Reynolds-averaged Navier-Stokes simulation are also included to give some insight into the complex flow field of the tandem *** transform,fast Fourier transform analysis,and visual inspection of casing pressure traces are used to analyze the unsteady result of the tandem rotor in clean and distorted *** tandem rotor is able to achieve its design pressure ratio and has a stall margin of 9%under the clean flow ***,stall appears as a low-intensity spike for all the cases,which turns into a long length-scale disturbance within three rotor revolutions.A modal wave of low frequency is also observed under clean

关键词： Tandem rotor Axial overlap and percentage pitch Radially distorted inflows Diffusion factor Stall Aerodynamics of compressor blade

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Stability management of high speed axial flow compressor stage through axial extensions of bend skewed casing treatment

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Propulsion and Power Research 2016年第3期5卷 236-249页

作者： Dilipkumar Bhanudasji Alone S.Satish Kumar Shobhavathy m.Thimmaiah Janaki Rami Reddy mudipalli a.m.pradeep Srinivasan Ramamurthy Venkat S.Iyengara Propulsion Division CSIR-NALBangalore 560037India Aerospace Engineering Department IIT BombayPowai 400076India NCAD CSIR-NALBangalore 560017India

This paper presents the experimental results to understand the performance of moderately loaded high speed single stage transonic axial flow compressor subjected to various configurations of axial extensions of bend skewed casing treatment with moderate *** bend skewed casing treatment of 33%porosity was coupled with rectangular plenum chamber of depth equal to the slots *** five axial extensions of 20%,40%,60%,80%and 100%were used for the experimental evaluations of compressor *** main objective was to identify the optimum extension of the casing treatment with reference to rotor leading edge which results in maximum stall margin improvements with minimum loss in the stage *** each axial extension the compressor performance is *** improvement in the stall margin was very significant at some axial extensions with 4%–5%penalty in the stage *** compressors stage shows recovery in terms of efficiency at lower axial extensions of 20%and 40%with increase in the peak stage *** of flow parameters showed the typical behaviors at near stall flow *** wire sensor was placed at the rotor upstream in the tip region to capture the oscillations in the inlet axial and tangential velocities at stall *** the absence of casing treatment the compressor exhibit abrupt stall with very high oscillations in the inlet axial and tangential velocity of the *** extents of oscillations reduce with bend skewed casing *** measurements were also performed in the plenum chamber and salient results are presented in this paper.

关键词： High speed compressor Bend skewed casing treatments Axial extensions Stall margin improvements Peak stage efficiency Hot wire probe Stall Abrupt

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A comprehensive review on the processing-property relationships of laser strengthened magnesium

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Journal of magnesium and Alloys 2024年第1期12卷 1-34页

作者： Alessandro m.Ralls Aaksheta Agnel pradeep L.menezes Department of mechanical Engineering University of Nevada RenoRenoNV 89557United States

Among the existing series of softer metals,magnesium(mg)has attracted much attention due to its impressive strength-to-weight ***,due to its ease of deformability,mg tends to suffer from rapid degradation in a wide variety of abrasive and electrochemical *** method of improving its surface properties is through surface modification *** the existing techniques,laser shock peening(LSP)has been one of the most widely utilized processes due to its surface-hardening-like *** this understanding,a comprehensive review has yet to exist that encapsulates the strengthening mechanism of LSP for mg and its influence in degradation *** review aims to encapsulate the existing research around the LSP field for ***,an understanding of the surface-strengthening effects in relation to its mechanical,tribological,corrosion,and tribo-corrosion characteristics is ***,the feasibility of LSP for mg materials in critical industries is also *** this work,a novel understanding of LSP for mg can be understood,which can provide a future direction for research in this field.

关键词： Laser shock peening magnesium Surface deformation Tribology microstructure

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Spark Plasma Sintering of mg-based Alloys:microstructure,mechanical Properties,Corrosion Behavior,and Tribological Performance

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Journal of magnesium and Alloys 2024年第2期12卷 405-442页

作者： Alessandro m.Ralls mohammadreza Daroonparvar pradeep L.menezes Department of mechanical Engineering University of Nevada RenoRenoNV89557United States

Within the past ten years,spark plasma sintering(SPS)has become an increasingly popular process for mg *** the SPS process,interparticle diffusion of compressed particles is rapidly achieved due to the concept of Joule *** to traditional and additive manufacturing(Am)techniques,SPS gives unique control of the structural and microstructural features of mg *** doing so,their mechanical,tribological,and corrosion properties can be *** great advancements in this field have been made,these pieces of knowledge are scattered and have not been contextualized into a single *** motivation of this work is to address this scientific gap and to provide a groundwork for understanding the basics of SPS manufacturing for *** do so,the existing body of SPS mg literature was first surveyed,with a focus on their structural formation and degradation *** was found that successful mg SPS fabrication highly depended on the processing temperature,particle size,and particle *** addition of metal and ceramic composites also affected their microstructural features due to the Zener pinning *** degradative environments,their performance depends on their structural features and whether they have secondary phased *** industrial applications,SPS'd mg was found to have great potential in biomedical,hydrogen storage,battery,automotive,and recycling *** prospects to advance the field include using mg as a doping agent for crystallite size refinement and using bulk metallic mg-based glass powders for amorphous SPS *** these findings,the interactions of multi-composites on the processing-structure-property relationships of SPS mg is not well *** total,this work will provide a useful direction in the SPS field and serve as a milestone for future mg-based SPS manufacturing.

关键词： Spark plasma sintering magnesium alloys Nanocrystalline Tribology mechanical properties Corrosion

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Gas hydrate saturation from NGHP 02 LWD data in the mahanadi Basin

Energy Geoscience

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Energy Geoscience 2024年第2期5卷 279-289页

作者： Uma Shankar pradeep Kumar Yadav Sneha Devi Udham Singh Yadav Department of Geophysics Institute of ScienceBHUVaranasi221005India Oil and Natural Gas Corporation Ltd. Gas Hydrate Research&Technology Centre(GHRTC)Panvel410221Navi MumbaiIndia

During the Indian National Gas Hydrate Program(NGHP)Expedition 02,Logging-while-drilling(LWD)logs were acquired at three sites(NGHP-02-11,NGHP-02-12,and NGHP-02-13)across the mahanadi Basin in area *** applied rock physics theory to available sonic velocity logs to know the distribution of gas hydrate at site NGHP-02-11 and *** physics modeling using sonic velocity at well location shows that gas hydrate is distributed mainly within the depth intervals of 150-265 m and 100 -215 mbsf at site NGHP-02-11 and NGHP-02-13,respectively,with an average saturation of about 4%of the pore space and the maximum concentration of about 40%of the pore space at 250 m depth at site NGHP-02-11,and at site NGHP-02-13 an average saturation of about 2%of the pore space and the maximum concentration of about 20%of the pore space at 246 m depth,as gas hydrate is distributed mainly within 100-246 mbsf at this *** of gas hydrate estimated from the electrical resistivity method using density derived porosity and electrical resistivity logs from Archie's empirical formula shows high saturation compared to that from the sonic ***,estimates of hydrate saturation based on sonic P-wave velocity may differ significantly from that based on resistivity,because gas and hydrate have higher resistivity than conductive pore fluid and sonic P-wave velocity shows strong effect on gas hydrate as a small amount of gas reduces the velocity significantly while increasing velocity due to the presence of *** site NGHP-02-11,gas hydrate saturation is in the range of 15%e30%,in two zones between 150-180 and 245-265 *** NGHP-02-012 shows a gas hydrate saturation of 20%e30%in the zone between 100 and 207 *** NGHP-02-13 shows a gas hydrate saturation up to 30%in the zone between 215 and 246 *** observations from rock physics modeling and Archie’s approximation show the gas hydrate concentrations are relatively low(<4%of the pore space)at the sites of the

关键词： mahanadi Basin Gas hydrate Sonic log Effective medium modeling Electrical resistivity log Archie’s analysis Gas hydrate saturation

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CHEmICAL SYNTHESIS,SPECTRAL CHARACTERIZATION AND STABILITY OF SOmE ELECTRICALLY CONDUCTING POLYmERS

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Chinese Journal of Polymer Science 2010年第2期28卷 191-197页

作者： pradeep Kumar Upadhyay Afaq Ahmad Department of Chemistry Aligarh Muslim University

The synthesis, characterization, thermal degradation and stability of polyaniline （PANI）, poly（m-nitroaniline）, poly（m-chloroaniline） and poly（o-methylaniline） were reported. Different properties were measured and compared with PANI to find out the effect of electron donating groups （-CH3） and electron withdrawing groups （-Cl, -NO2）. It was found that the presence of any type of substitution in the benzene ring of aniline increased the solubility but reduced the yield, thermal stability and electrical conductivity. Two probe methods were used to measure the electrical conductivity of these polymers. The structural properties of these polymers were characterized by using FTIR and UV-Vis spectroscopic methods. Thermal degradation and stability of these polymers were explained by using thermogravimetric analysis （TGA） and conductivity measurements.

关键词： Polyaniline Electrical conductivity Yield Thermal degradation Stability.

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Revisiting novel symmetries in coupled N=2 supersymmetric quantum systems:examples and supervariable approach

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Communications in Theoretical Physics 2020年第10期72卷 103-112页

作者： Aditi pradeep Anjali S Binu m Nair Saurabh Gupta Department of Physics and Astronomy University of British ColumbiaVancouver Campus325-6224 Agricultural RoadVancouverBC V6T 1Z1Canada Department of Physics National Institute of Technology Calicut

We revisit the novel symmetries in N=2 supersymmetric quantum mechanical models by considering specific examples of coupled ***,we extend our analysis to a general case and list out all the novel *** each case,we show the existence of two sets of discrete symmetries that correspond to the Hodge duality operator of differential ***,we are able to provide a proof of the conjecture which points out the existence of more than one set of discrete symmetry transformations corresponding to the Hodge duality ***,we derive on-shell nilpotent symmetries for a generalized superpotential within the framework of supervariable approach.

关键词： N=2 SUSY quantum mechanical system continuous and discrete symmetries de Rham cohomological operators (anti-)chiral supervariable approach SUSY invariant restrictions

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Synthesis and evaluation of 4-substituted semicarbazones of levulinic acid for anticonvulsant activity

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2005年第7期6卷 617-621页

作者： AGGARWAL Navneet mISHRA pradeep Lachoo memorial College of Science and Technology Pharmacy Wing Jodhpur Rajasthan 342003 IndiaDepartment of Pharmaceutical Sciences Dr. Hari Singh Gour University Sagar M.P. 470003 India

Objective: A series of 4-aryl substituted semicarbazones of levulinic acid (4-oxo pentanoic acid) was designed and synthesized to meet the structural requirements essential for anticonvulsant activity. methods: All the compounds were evaluated for anticonvulsant activity. Anticonvulsant activity was determined after intraperitoneal (i.p.) administration to mice by maximal electroshock (mES) and subcutaneous metrazol (Scmet) induced seizure methods and minimal motor impairment was determined by rotorod test. Results: A majority of the compounds exhibited significant anticonvulsant activity after intraperitoneal administration. In the present study 4-(4'-fluoro phenyl) levulinic acid semicarbazone emerged as the most active molecule, showing broad spectrum of activity with low neurotoxicity. Unsubstituted levulinic acid semicarbazone was found to be inactive in all the screens. Conclusion: The results obtained validate the hypothesis that presence of an aryl group near the semicarbazone moiety is essential for anticonvulsant activity. The results also indicate that the hydrophilic-hydrophobic site can accommodate hydrophilic groups.

关键词： Substituted semicarbazones Anticonvulsant Levulinic acid

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Techno-economic analysis on oxy-fuel based steam turbine power system using municipal solid waste and coals with ultrasonicator sulfur removal

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Waste Disposal and Sustainable Energy 2022年第2期4卷 131-147页

作者： pradeep Sahu V.Prabu Department of Chemical Engineering Indian Institute of Technology GuwahatiAssam781039India

municipal solid waste(mSW)is a carbon–neutral energy source and possesses a moderate heating value;hence,it can be used as an alternative fuel for *** use high ash and high sulfur Indian coals efficiently,a techno economic analysis is performed for electricity generation using supercritical and subcritical based steam turbines operating in the oxy-fuel co-combustion mode of mSW with Indian *** impact of the capture of direct and indirect greenhouse gasses such as CO_(2),NO_(x)and SO_(x)on the net thermal efficiency of the power plants is *** supercritical based steam turbine achieved a higher net thermal efficiency by 8.8%using mSW based feedstock compared to sub-critical *** co-combustion mode reduced the levelized cost of electricity(LCOE)by 48–73$/***-economic analysis for sulfur removal in coal using ultrasonication technology has not yet been reported in the *** incorporation of an ultrasonicator(a pre-combustion sulfur remover)and a duct sorbent injector(a post-combustion SO_(x)absorber)increased the LCOE by 1.39–2.75$/*** high sulfur coals,the SO_(x)emissions decreased from 224.79 mg/m^(3)to 9.2 mg/m^(3).

关键词： municipal solid waste Coal Steam turbine power plant Economic analysis Co-combustion

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