Browsing by Author "Murthy, Y. V. V. Satyanarayana"

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Comparitive analysis of nox and smoke emissions of binary diesel/ jme blends doped with AL2O3 nanoparticles stabilised by dee as solvent and triton-x100 and brij58 surfactants /
(RJC, 2021-01-01) Murthy, Y. V. V. Satyanarayana ; Ghosh, Surajit
According to this study, nanosized fuel carried additions to the tri-fuel blends on the engine performance and vibrations are investigated in detail. The tri-fuel mix, which is classified as DEE5BD25-Al2O3 np, is composed of diethyl ether (DEE) in the proportion of 5 percent, biodiesel Jatropha methyl ester (JME) in the proportion of 25 percent, and diesel in the proportion of 75 percent. DEE is a well-known high-cetane ignition improver and nanoparticle suspension stabilizer. To achieve the required results, the Al2O3 nanoparticles were sized at 25nm and concentrated from 25ppm to 50ppm in a binary diesel/JME mix. In order to suspend the nanoparticles in this fuel mix, the surfactants Trtion-X100 and Brij58 were selected independently and used in an ultrasonic liquid processor. The introduction of DEE into the binary diesel/JME mix has also changed it with nanoparticles and non-ionic surfactants, resulting in an improvement in the physicochemical characteristics. According to the findings of the testing, TFB with Al2O3 np had a 1.25 % greater brake thermal efficiency than clean diesel. The use of a higher percentage of Al2O3 np is not advised owing to the inactive heat dissipation in the fuel mix, as well as the possibility of a reduction in the chemical activity of the fuel catalyst. The addition of Al2O3 np to this fuel mix decreased NOx emissions by 200ppm compared to the use of straight diesel fuel alone. The results indicate that Brij58 outperformed the Trition-X100 surfactant in TFB, and that the amount of smoke produced is mostly dependent on the surfactant used. Triton-X100 produced less smoke when compared to the Brij surfactant, while Al2O3-B emitted 69.1 HSU compared to 57.7 HSU for Triton-X100. Triton-X100 released less smoke when compared to the Brij surfactant.
Correlation between propulsion engine with propulsor for fishing vessels â€“ a mathematical approach /
(IEEE, 2022-02-21) Narayanan, Jayagopal; Murthy, Y. V. V. Satyanarayana ; Balaji, Rajoo ; Ghosh, Surajit; Hulmani, Ram M.
The energy efficiency is of most important in all economical activities for the fishing industry, energy efficiency can be expressed in term of the ratio of fishing capture over operational cost. The fuel cost and maintenance cost in fishing vessel operation became a dominant factor of the total operational cost. Moreover, fuel cost is high and continues to increase. Each region in India follows unique methods of vessel construction and fishing methods. Also, vessel speed requirement of the regions and the type of fishing are diversified. One way to achieve best energy efficiency is highly depends on the optimum selection of engine and the propeller for the vessel. This research aims to estimate the optimal common mathematical simulation approach for matching propulsion engine along with propeller for the fishing vessel by considering all variables such as hull profile, fishing methods, operating pattern, resistances and appendix as an influencing function. The method and operation pattern of Cruising, Trawling, Purse seine, Gillnet, Long line are taken into consideration for all mathematical simulation. In addition to mathematical simulation this report also covers the practical verification and validation of actual on-board performance on all selected type of fishing vessels, methods, grounds and fishing operations.
Numerical simulation of NOx & soot emissions of single cylinder diesel engine with EGR modified to run on CRDI for high pressure split injections
(International Journal Of Creative Research Thoughts (IJCRT), 2021-05) Balaji, C. P.; Murthy, Y. V. V. Satyanarayana; Ghosh, Surajit; Chaitanya, N. S. C.
High pressure split injection with advanced fuel injection strategies is one of the prominent techniques for controlling the emissions NOx and Soot released from diesel engines however Exhaust gas recirculation (EGR) is one of the significant methods to control the engine emissions but research is limited for high pressure fuel injection technique. Various injection strategies like advanced and retarded injection angles are well known but proper published results for high pressure fuel injection is not available. At the same time these advanced injection strategies can control the injection pressure and fuel injection duration angle but nozzle orientation is fixed and cannot be changed frequently due to the manufacturing limits. Also, the choice of the fuel injection angles is trial based and hence accurate prediction of the engine performance is very much limited. To overcome this draw back numerical simulations using converge CFD software is performed for single cylinder diesel engine for EGR flow rates ranging from 0-15% on mass basis for 250bar injection pressure. The simulation results show that that 5% EGR flow rate for -11deg @250 bar fuel injection angle at injection pressure is effective in reducing the NOx and Soot emissions efficiently when the engine run on ULSD diesel fuel with cooled EGR.
Vibrartion analysis of fibre glass contra rotating propeller of fishing vessel /
(IEEE, 2022-02-21) Murthy, Y. V. V. Satyanarayana ; Balaji, Rajoo ; Narayanan, Jayagopal; Hulmani, Ram M.
Conventional marine propeller remains the standard mechanism for ship propulsion however the blade material of a marine propeller is very significant in reducing the noise and vibration. The efficiency of a marine propeller mainly depends on blade material due to the marine corrosive environment, scaling and marine aquatic growth on the blade surface. The propeller efficiency depends on blade shape, size, density, and strength of the material. A suitable blade material should have low density, high strength and long fatigue life. At the same time the blade material should with stand large hydrodynamic inertia, fatigue load, sustain the sea environmental effects like accumulation of silts, sediments, algae, calcium deposits etc. Due to the increase in weight of the propeller due to these deposits and also designing a larger size propeller becomes more important. Indeed, optimising the weight of the propeller blades are of great importance since this would lower the forces transferred on to the propeller hub. These factors demand the selection of new and innovative materials for blade manufacturing to sustain above environmental conditions and required mechanical properties. Fibre glass appears to be a promising material for marine propellers being well known for its low weight, high strength and stiffness. It is highly flexible and low-cost material and acts as a protective barrier from corrosion and rust in saline environment and found to be a promising propeller material for small craft fishing vessels. To control the noise and vibration and improve the onboard comfort level on small fishing vessel contra rotating propeller made from fibre glass was proposed in the present research work. For this propeller made from 3 different materials such as fibre glass, Carbon Epoxy and Aluminium were chosen and modelled for different geometries. A contra rotating propeller comprises two coaxial propellers sited one behind the other and rotating in opposite directions. The forward propeller diameter is bigger in diameter has 4 blades while aftermost propeller is smaller in diameter have 3 blades only both of them made from fibre glass material. This present CAD model was designed using FUSION 360 software. The purpose of the contra rotating propeller is to ensure that the design of the propeller is tuned according to the above needs. The vibration simulation studies are carried using Ansys FEM analysis software. In this work the modal analysis was done without considering the damping for different thrust loads using Fluent software 16. 0. The blade is assumed like a cantilever beam subjected to loading. A higher section modulus is taken which can be achieved if more mass/fibre is distributed towards the root of the blade as opposed to the tip, as more distribution of mass away from the neutral axis. The simulation results obtained were compared with respect to the other materials. In the present simulation fixed boundary conditions are assumed at the two propeller shafts with total number of elements as 4548 and 8436 nodes. The results show that the mode shapes for above modelled fibre made glass contra rotating propeller regarding 1st, 2nd & 3rd order frequencies occur at of 52.815Hz, 78.42Hz & 116.96Hz respectively. The results confirms that fibre glass material would be a promising material for contra rotating propellers suitable to small craft marine fishing vessels.