Journal Articles

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Research for navigation safety and function of electronic devices on ship
(International journal of recent advances in multidisciplinary topics, 2023) Dixit, Vartul.
The Marine Radar and use of electronic chart gives precise calculation of range and bearing of targets which is required for accurate navigation. Integration of radar wave detection and ranging system on the navigational station is a mandatory requirement for safe navigation. Human eye alone can guess the distance but cannot quantitatively state the range of object therefore, intervention of RADAR technology makes a ship master accurate object detector. In navigation we can fix vessel’s position by many methods like by cross bearings taken from two different objects, beam bearing to four-point bearing method, Horizontal sextant method, Vertical sextant method, cross bearing from three objects, by celestial fix, by bearing of object and sounding contour change, GPS fixing and by marine Radar. A ship’s master can monitor vessel’s real time position continuously on the ECDIS monitor. All together both equipment have improved master’s ability to better monitoring of navigation.
Performance of tobacco oil-based bio-diesel fuel in a single cylinder direct injection engine
(International Journal of the Physical Sciences, 2010-10) Satyanarayana Murthy, Y. V. V.
In the present investigation, the high viscosity tobacco oil, which has been considered as non-edible oil as a potential alternative fuel for the Compression Ignition Engine (C. I.). Tobacco Methyl Ester (TME) was prepared by transesterification of raw tobacco oil. A two stage transestirification process was developed since tobacco is having higher acidic value. Transesterification was done using NaOH in the presence of sulphuric acid as catalyst and both acid transesterification and base transestirification was performed. Since TME has higher kinematic viscosity, its viscosity has been reduced by blending with neat diesel. The bio-diesel was blended with neat diesel at various volumetric proportions of B2, B5 (denoting 2, 5%) .The performance of this alternate fuel was tested by conducting a series of tests on 4 stroke single cylinder 5.2 kW direct injection diesel engine. The engine was run at different loads like full load, 3/4, 1/2, 1/4 and no load at various speeds and also at constant speed .The tests were conducted by using neat diesel and also diesel fuel blended with TME The combustion characteristics and exhaust emissions like hydrocarbon (HC), carbon (II) oxide (CO) and nitric oxides (NO) were measured. Torque, brake power, specific fuel consumption was also measured and the test was plotted in the graphs. The physical and chemical specifications like flash point, fire point, density, kinematic viscosity and acid number of TME were established. Significant improvement in engine performance was observed. The specific fuel consumption and the exhaust gas temperature reduced due to the decrease in viscosity of TME. From the properties and engine test results it has been established that at lower percentage of blending, TME has improved the engine performance but at higher percentages of blending, the performance and engine emissions were drastically effected. The results show that the TME can be used as an alternate fuel in diesel engines without any engine modifications.
Design of muffler for A low powered gas turbine exhaust system
(International Journal of Heat and Technology, 2012-06) Sarma, P. K.; Ghosh, Rajesh.; Satyanarayana Murthy, Y. V. V.; DharmaRao, V.
The report contains the design of the muffler to be installed in the stack of chimney for low powered 10 megawatt gas turbine. The parameters pressure and temperature of the exhaust gas are to be gradually reduced in three successive modules with the energy considerations. The design is accomplished for a range of possible magnitudes of friction coefficients for the gas expanding through perforations. Besides, based on the results of computations drawings are provided with the aid of auto cad for manufacturing and fabrication purposes.
Wake analysis from the first principles of hydrodynamics
(International Journal of Heat and Technology, 2014-12) Sarma, P. K.; Satyanarayana Murthy, Y. V. V.; Timmaraju, M.; Radhika, Y.; Rajeswara, Reddy.; Ramanarayanan, C. P.
The theoretical approach presents the dynamics of the wake under ideal conditions free from cavitations and boundary layer separation effects in the stern region during cruise of a ship. Principles of conservation of momentum and kinetic energy are considered in the formulation. The power rating of the propeller is found to be the dominant parameter determining the active length of the wake for the range 2x106 W< POWER < 15X106 W. However, the profile of the wake is uniquely considered independent of the power of the propeller. The assumption such as a logarithmic variation of the profile of the wake can be altered by any of the suitable functional relationship depending on aerial observations and the data.
An approach to investigate the characteristics of high speed turbo machines
(International Journal of Heat and Technology, 2013-12) Sarma, P. K.; Satyanarayana Murthy, Y. V. V.; Srihari, Reddipalli.; Chada, Kedarnath.; Ramnarayanan, C. P.
The article proposes a method to investigate some of the essential characteristics of high speed rotating machinery. The underlying principle of power versus speed dependence of a rotating machine is defined by a second order differential equation with dependent and independent variables respectively as power and speed. The solution of such an equation together with the dynamic relation of flow of the medium would enable further to generate the essential characteristics specific power of the compressible medium of the turbo machine under consideration.
Artificial Neural Network modeling of a hydrogen dual fueled diesel engine characteristics: An experiment approach
(International journal of hydrogen energy, 2017) Syed, Javed.; Ulla Baig, Rahmath.; Algarni, Salem.; Satyanarayana Murthy, Y. V. V.; Masood, Mohammad.; Inamurrahman, Mohammed
The rapid growth of vehicular pollution; mostly running on the diesel engine, emissions emerging are the concerns of the day. Owing to clean burn characteristics features, Hydrogen (H2) as a fuel is the paradigm of the researcher. Extensive research presented in the literature on H2 dual fueled diesel engine reveals, the significant role of H2 in reducing emissions and enhancing the performance of a dual fueled diesel engine. With meager qualitative experiment data, the feasibility to develop an efficient Artificial Neural Network (ANN) model is investigated, the developed model can be utilized as a tool to investigate the H2 dual fueled diesel engine further. In the process of developing an ANN model, engine load and H2 flow rate are varied to register performance and emission characteristics. The creditability of the experiment is ascertained with uncertainty analysis of measurable and computed parameters. Leave-out-one method is adopted with 16 data sets; seven training algorithms are explored with eight transfer function combinations to evolve a competent ANN model. The efficacy of the developed model is adjudged with standard benchmark statistic indices. ANN model trained with Broyden, Fletcher, Goldfarb, & Shanno (BFGS) quasi-Newton backpropagation (trainbfg) stand out the best among other algorithms with regression coefficient ranging between 0.9869 and 0.9996.
Effect of cooled EGR on modified light duty diesel engine for combustion, performance and emissions under high pressure split injection strategies
(Case Studies in Thermal Engineering, 2018) Edara, Gautam.; Satyanarayana Murthy, Y. V. V.; Srinivas, Paleti.; Nayar, Jayashri.; Ramesh, Merigala.
Environmental concerns demands light duty Engines to satisfy the stringent Euro VI emission norms. The aim of this study is to present the effect of cooled exhaust gas recirculation (EGR) on emission reduction. Tests are conducted on a modified single cylinder light duty diesel engine to run on high pressure common rail direct fuel injection. Diesel is injected directly in to the engine cylinder for both retarded and split injections at pressures of 200, 230, 250, 300 and 350 bar respectively. Cooled EGR is circulated along with intake air in to the inlet manifold of the engine for flow rates of 5% and 10%( wt/wt) of injected air respectively for both retarded and split injections. Single injection is retarded at−11° ATDC and split injection consists of pilot injection at −54°ATDC of 10% mass share and main injection at −11°ATDC of 90% mass share. The result shows split injection (MPFI) decreases the ignition delay, In-cylinder combustion temperature and peak pressure for higher EGR flow rates compared to retarded single injection (SI) for all Injection pressure. Split injection reduced NOx from 1400 ppm to 200 ppm for 10% EGR flow rate at 350 bar injection pressure at full load operating conditions. Split injection at high Injection pressure decreases smoke by 10% as compared to retarded single injection. Test results show that there is trade-off exists between retarded and split injections at 350 bar injection pressure at full load conditions. Retarded injection has 33.61% brake thermal efficiency while split injection exhibits only 29.06% for 5% EGR flow rates. But higher EGR flow rates of 10% both retarded and split injection has nearly same brake thermal efficiency of 30.11%. Split injection reduced the combustion duration, ignition delay and exhaust gas temperatures for higher EGR flow rates compared to single retarded injection. The present research reveals that there exists an injection pressure map between the design operating pressure and maximum injection pressure. MPFI system under CRDI mode is very effective in reducing the NOx emissions with 10% EGR flow rates for maximum Injection pressure. While retarded SI injection is effective for moderate Injection pressure with the same EGR flow rates.
Combustion analysis of modified light duty diesel engine under high pressure split injections with cooled EGR
(Engineering Science and Technology, an International Journal, 2019) Edara, Gautam.; Satyanarayana Murthy, Y. V. V.; Nayar, Jayashri.; Ramesh, Merigala.; Srinivas, Paleti.
The aim of the present research work is to study the combustion phenomenon in modified light duty diesel engine to run on Common rail direct injection (CRDI) system under cooled exhaust gas recirculation (EGR). The test engine is single cylinder 3.7 kW@1500 rpm direct injection diesel engine capable of injecting high pressure fuel for both retarded and split injections. The engine is fitted with separate electronic variable timing fuel injection kit instead of conventional fuel supply system. Retarded injection consists of single injection at 11 before top dead centre (BTDC) and split injection consists of both pilot injection at 54 BTDC of 10% mass share and main injection at 11 BTDC of 90% mass share. Diesel is injected directly in to the engine cylinder for both retarded and split injections at pressures of 200,230,250,300 and 350 bar respectively. Cooled EGR is circulated along with intake air for flow rates of 5% and 10% (wt/ wt) basis. The experimental set up is capable of delivering precise control of fuel and EGR flow rates at all operating conditions. Test results show that there is trade-off exists between retarded and split injections at 350 bar injection pressure at full load conditions. Retarded injection has 34% brake thermal efficiency while split injection exhibits only 32.1% for 5% EGR flow rates. But higher EGR flow rates of 10% both retarded and split injection has nearly same brake thermal efficiency of 30.1%. Split injection reduced the combustion duration, ignition delay and exhaust gas temperatures for higher EGR flow rates compared to single retarded injection.
Synthesis of algae biodiesel using K2CO3/ZnO heterogeneous base catalyst and its characterisation
(RASĀYAN Journal of Chemistry (RJC), 2019-12) Nair, Jayashri.; Satyanarayana Murthy, Y. V. V.; Ramesh, M.; Edeira, Gautam.
The objective of the present work is to produce algae biodiesel with base heterogeneous catalyst K2CO3 /ZnO. This catalyst is prepared by wet impregnation method calcined at a high temperature of 600oC. 30% doping of K2CO3on ZnO calcined at 600oC was studied for biodiesel yield. Transesterification reaction parameters like catalyst concentration, temperature, stirring speed, the molar ratio of methanol to oil on biodiesel yield were investigated. The produced algae biodiesel was characterized by various techniques such as thermogravimetric and differential thermal analysis (TGA-DSC), Gas Chromatography analysis and Fourier transform infrared (FT-IR) spectroscopy. Gas chromatography (GC) shows the presence of higher Oleic acid content of 90.8% and Linolenic acid of 0.1% in the synthesized algae biodiesel. Differential scanning calorimetric analysis shows that the boiling point off fatty acid methyl esters is 269.50C. Thermogravimetric analysis reveals that oil decomposition starts at360oCand maximum weighty loss is observed at 422.5oC.
Experimental investigation of performance and emissions on low speed diesel engine with dual injection of solar generated steam and pongamia methyl ester
(Indian Journal of Science and Technology, 2011-01) Satyanarayana Murthy, Y. V. V.; Sastry, G. R. K.; Satyanaryana, M. R. S.
An experimental investigation has been carried out to examine the effects of steam injection into the intake manifold of a single cylinder, low speed, direct injection diesel engine fuelled with biodiesel palm methyl ester. Steam injection is generally carried out by non–conventional energy source. The addition of steam in to the intake manifold of the engine was carried out by vaporizing the water inside a boiler and heat is supplied by the solar concentrated parabolic dish. Biodiesels are known to produce higher NOx when compared to the neat diesel. Addition of steam to the combustion chamber of diesel engine has known effects of reducing the dangerous emissions of NOx but it is not clearly known about the engine performance and emissions. To examine this, an experimental investigation has been carried out on a single cylinder low speed diesel engine with steam injection in to the intake manifold during the suction stroke on the performance and engine emissions. Experiment results shows that there is a significant reduction in smoke levels and NOx during the steam injection both for the diesel fuel and pongamia methyl ester. Also there is a significant improvement of engine performance in terms of specific fuel consumption and brake thermal efficiency with steam injection.

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