Browsing by Author "Chaitanya, N. S. C."

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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
(Rasayan Journal of Chemistry, 2021-12) Chaitanya, N. S. C.; Murthy, Y. V. V. Satyanarayana.; Satyanarayana, M. R. S.; Ghosh, Surajit; Javed, S.
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.
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.
Transesterification of Algae Oil using K2CO3/ZnO Heterogeneous Base Catalyst
(ASIAN JOURNAL OF CHEMISTRY, 2019) Jayashri N. Nair.; Satyanarayana Murthy, Y. V. V.; Chaitanya, N. S. C.; Ramsh, M.
The objective of the present work was to develop a heterogeneous base catalyst K2CO3/ZnO for transesterification of algae oil. This catalyst was prepared by wet impregnation method calcinated at high temperature of 600 °C. The catalyst was characterized by X-ray diffraction technique. The crude algae oil was degummed and its free fatty acid was reduced to 2 % by methanol treatment. Methanol was used to convert triglycerides to biodiesel using K2CO3/ZnO. The doping of 30 % K2CO3 on ZnO calcined at 600 °C was studied on biodiesel yield. The reaction parameters such as temperature, stirring rate, amount of catalyst, methanol to oil molar ratio on the yield of fatty acid methyl ester were investigated. Highest yield was obtained for 7 % catalyst, 9:1 methanol to molar ratio at 80 °C for 30 % K2CO3/ZnO. This study proved that the catalyst loading less than 5 % was unsuccessful in biodiesel yield. The physio-chemical properties of the produced algae biodiesel was determined as per ASTM test procedures.