43 research outputs found
Influence on the performance and emissions of an automotive Euro 5 diesel engine fueled with F30 from Farnesane
No full textNumerical investigation of a porous media combustor in a small-scale diesel engine
No full textThe application of porous media in compression ignition engines has significant effects on its combustion behavior. In this work, a Computational Fluid Dynamics (CFD) analysis of combustion in diesel engine is performed for 100% load, and the effects of porous media addition in the combustion chamber are quantified. With a porosity of 66.7%, silicon carbide is applied as porous media of cylindrical shape in the modified piston bowl in the conventional engine. The combustion analysis outputs include average cylinder-pressure, temperature; Nitrogen Oxides (NOx), mean mixture fraction, turbulent kinetic energy, total energy and modified Peclet number. The results of the CFD study for the cases of non-porous media are validated against the performed baseline experimental analysis, whereas porous media predictions are compared to the state-of-the-art studies available in the literature. In presence of porous media, the average peak pressure and temperature are found to drop by similar to 26 bar and similar to 550 K, respectively, as compared to that of non-porous media. Furthermore, NOx emissions are significantly reduced up to 97%. The generation of turbulent kinetic energy is enhanced by 86% for PM leading to an increment of similar to 36% in the thermal energy conversion than without a porous media. (C) 2019 Elsevier Ltd. All rights reserved
Effects of different biofuels blends on performance and emissions of an automotive diesel engine
No full textThe impact of blending Ultra Low Sulfur Diesel (ULSD) with different biofuels, obtained from Rapeseed Methyl Ester (RME) and Hydrotreated Vegetable Oil (HVO) respectively, on the performance and emissions of a European passenger car diesel engine was assessed in this paper. First, the hydraulic behavior of the common rail fuel injection system was analyzed in terms of injected volume, injection rate, spray global shape, single jet tip penetration and cone angle with both RME and HVO blends in comparison with neat ULSD. Afterwards, the impact of biofuel blends on engine full load performance was analyzed, both for the standard calibration and for a calibration which was specifically adapted to biofuels characteristics. The effects of biofuel blends on brake specific fuel consumption and on regulated exhaust emissions were then evaluated at different part load operating conditions, representative of the New European Driving Cycle. Finally, the sensitivity of the different fuels to different calibration settings, such as Exhaust Gas Recirculation (EGR) and injection timing, was studied in order to investigate which further emission benefits could be achieved by means of a more extensive engine re-calibration
Trachischium sushantai Raha & Das & Bag & Debnath & Pramanick 2018, sp. nov.
No full textTrachischium sushantai sp. nov. (Figures 1, 2) Holotype. ZSI25651 A, National Zoological Collection, ZSI, Kolkata; adult female; from ‘ Jammu’ (Jammu & Kashmir state, India); collected on 4th August, 1993, during Jammu survey; name of collector is given in register as ‘ Rajtilok’. Diagnosis. Trachischium sushantai sp. nov. can be diagnosed by a combination of the following characters: a single nasal and PF, SL (R/L) 6/6, post-ocular 1, DSCH:M: V 13:13:13; VEN 152; SC 23 pairs of which those on anterior half of tail are as long as wide and regular hexagon/ rhomboid shaped, TAL/TL ratio of 0.11, head and dorsum uniform dark brown, venter brown with cream or yellow border on the trailing edges of VEN and SC. Etymology. The new species is named after Sushanta Kumar Das, father of the second author of present paper. He is an enthusiastic nature observer who have spent a significant amount of time of his life in forested areas of West Bengal (India) and nurtured the same interest in the second author. The specific epithet, a patronym, is a noun in genitive case. Description of holotype. Adult female; incised on underside; SVL and TAL of 276 mm and 35 mm respectively; tail small, TAL /TL ratio being only 0.11; head small (HL 7.8 mm, 2.8 % of SVL); head width (HW 4.7 mm) greater than head height (HH 4.2 mm); head indistinct from neck; eye small (ED 1 mm, 12.8 % of HL); ESN 2.9 mm; rostral slightly wider than high (1.1 mm and 0.8 mm, respectively); internasals paired, much shorter than the single PF; frontal pentagonal, 2.8 mm long, longer than its distance from the posterior edge of rostral (1.9 mm), around two and half times wider than supraocular; parietals, being 4.4 mm long, are longer than frontal; 1 pre- and 1 post-ocular; loreal nearly twice wider than high and is in contact with nasal, internasal, frontal, preocular and 1 st and 2nd SL; very small nostril in single forward directed nasal; SL (R/L) 6/6, 1 st smallest and 6th largest, 3rd and 4th touching eye; IL (R/L) 6/6, 1st, 2nd and 3rd IL touch the anterior genial while the 4th one contacts both the anterior and posterior genials; anterior genials longer than posterior genials; TEMP (R/L) 1+2/1+2; maxillary teeth in life were probably around 16 or 17 (counting for missing teeth which were evident by longer than usual gaps between extant teeth at some places), subequal; dorsal scales smooth, including those around the region of the tail base, DSCH:M: V 13:13:13; VEN 152; anal divided; SC 23 pairs, anterior subcaudals (those on anterior half of tail) are as wide as long (4SCW/L 1.05 and 5SCW/L 1.01), regular hexagonal or rhomboid shaped, SC become slightly wider than long on posterior part of tail; tail tip in a spike like scale. Coloration in preservative: head and dorsum uniform dark brown; edges of scales on lower jaw lighter colored; venter brown with outeredges of VEN cream or dirty yellow; underside of tail light brown with the posterior edges of SC bordered with lighter yellowish cream. Comparisons. T. sushantai sp. nov. differs from T. monticola in possessing 13 rows of dorsal scales (vs. 15 rows in the latter), undivided PF (vs. divided PF in T. monticola), 1 post-ocular (vs. usually 2 in the latter) and 152 VEN (vs. less than 125 VEN in T. monticola [Smith 1943])(Table 2). T. sushantai sp. nov. differs from T. leave in having 6 SL, 1 PF, 23 SC and a brown venter (vs. 5 SL, 2 PF, 29– 39 SC and a yellow venter in T. leave). T. sushantai sp. nov. can be diagnosed from T. tenuiceps by having a shorter tail (TAL /TL 0.11), 1 PF, 1 postocular, 23 SC of which the anterior ones are regular hexagonal or rhomboid and a brown venter (vs. TAL /TL 0.15– 0.18, 2 PF and 2 post-oculars, 28–42 SC of which anterior ones are transversely elongated and yellowish or orange ventral coloration in T. tenuiceps). T. sushantai sp. nov. differs from T. guentheri by having a brown venter and 23 pairs of SC (vs. a coral red venter in T. guentheri and SC more than 30 in T. guentheri [Smith 1943]). The new species most closely resembles T. fuscum from which it can be distinguished by its shorter tail (TAL / TL 0.11) compared to T. fuscum (vs. TAL /TL 0.13–0.18 [± 0.14 in 27 specimens] in T. fuscum), 23 pairs of SC of which anterior ones are regular hexagonal/rhomboid with 4SCW/L 1.05 and 5SCW/L 1.01 (vs. 30–44 SC in T. fuscum [31–41 in females examined by us], SC wider than long and are not regular hexagonal/rhomboid with 4SCW/L 1.33–3 [± 1.6 in 22 specimens] and 5SCW/L 1.27–2.7 [± 1.6 in 21 specimens] in physically examined specimens [specimens of T. fuscum examined from photographs too had SC number within the range given here and were distinctly wider than long]). Distribution. Trachischium sushantai sp. nov. is currently known only from its type locality in Jammu (Jammu & Kahmir, India) (Figure 3). Natural history. Unknown.Published as part of Raha, Sujoy, Das, Sunandan, Bag, Probhat, Debnath, Sudipta & Pramanick, Kousik, 2018, Description of a new species of genus Trachischium with a redescription of Trachischium fuscum (Serpentes: Colubridae: Natricinae), pp. 549-561 in Zootaxa 4370 (5) on pages 550-553, DOI: 10.11646/zootaxa.4370.5.6, http://zenodo.org/record/114735
Comparative Analysis of Absorber Tubes of Parabolic Trough Solar Collector Using Therminol VP-1 as Heat Transfer Fluid
No full textThermal Performance Study of Helically Grooved Absorber Tubes for Parabolic Trough Solar Collector
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Prediction of performance coefficients of a three-bucket Savonius rotor using artificial neural network
No full textComputational Analysis of Internally Grooved Absorber Tubes of Parabolic Trough Solar Collector for Constant Mass Flow Rate of the Heat Transfer Fluid
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