Optimization of diesel engine parameters using Taguchi method and design of evolution
The objective of this work is to optimize the control parameters of the direct injection (DI) single cylinder diesel engine with respect to NOx (Oxides of Nitrogen) and fuel emissions through experimental investigations and Taguchi method. A single cylinder 5.2 kW diesel engine was selected for this experiment. Five parameters such as clearance volume, valve opening pressure, nozzle-hole diameter, static injection timing and load torque were varied at four levels and the responses such as NOx emissions and fuel economy were recorded. The optimum values of the response variables could be predicted using S/N ratio and optimum combination of control parameters were specified. Results of confirmation tests showed good agreement with predicted results. Thus the relationship between the diesel engine operating parameters with NOx and b.s.f.c (brake specific fuel consumption) could be understood using Taguchi method of experimental design.
Emission characteristics of water-emulsified diesel fuel at optimized engine operation condition
ABSTRACT The present study is carried out to analyze the emission characteristics of a natural aspirated diesel engine running with water-in-diesel emulsion fuel at optimized engine operating condition. In the first phase of the experiment, key engine operating parameters say compression ratio and water concentration with diesel are optimized in order to obtain higher performance and lower emissions level at all loading conditions using Taguchi-grey relational analysis based on signal-to-noise ratio and grey relational grade. The optimized condition of engine operating parameters is identified as 10% WC (water concentration) with diesel and 18-CR (compression ratio) at all loading conditions. In the second phase, experiments are conducted at optimal condition and the emission characteristics are compared with neat diesel. The results reveal that 10% WC with diesel at 18-CR exhibits better NOx emission level at all loading conditions with a marginal penalty in other emissions.
PLEASURE, POWER, AND THE PURSUIT OF COMMUNISM: SOVIET YOUTH AND STATE-SPONSORED POPULAR CULTURE DURING THE EARLY COLD WAR, 1945-1968
art, with certain students accused of “showing political immaturity, failing to understand the Party’s positions on art.” This episode constituted part of a broader crackdown on abstract art by the Khrushchev administration from late 1962, precipitated the the Soviet leader’s derision of such art forms in December 1962 at the Manege exhibit. Such instances demonstrate the limitations of the top-level promotion of youth grassroots initiative, as the Khrushchev leadership reigned in youth autonomy when it threatened to go beyond the boundaries of the permissible. The dates cited above have particular resonance, since both 1957-58 and 1962-63 represent two periods when those at the top of the Party hierarchy moved away from pursuing a more pluralistic, tolerant policy course, due to anxiety inspired by both sharpening Cold War hostilities and domestic developments. In these periods, official rhetoric censured what it labeled as 639 TsAOPIM, f. 635, op. 13, d. 546, ll. 56-57. This is likely related to criticism of the Party associated with the fallout from the Secret Speech and the Hungary invasion. For more, see Polly Jones, “From the Secret Speech to the Burial of Stalin: Real and Ideal Responses to De-Stalinization,” in Jones ed., The Dilemmas, 41-63. 640 TsAOPIM, f. 6083, op. 1, d. 52, ll. 166-67. 641 Susan E. Reid, “In the Name of the People: The Manege Affair Revisited,” Kritika 6.4 (Fall 2005): 673716. 642 On these anxieties, see Dobson, Khrushchev’s Cold Summer, 156-88.