The power generation mainly depends on fossil diesel fuel, the primary source of harmful emissions and global warming. Therefore, the researcher aims to explore alternative fuels that got greater attention in compression ignition engines. The commercial Diesel-RK software simulates the current numerical study of diesel engine direct injection with speed engine 1500 rpm, compression ratio 17.5, single cylinder, and naturally aspirated. In the basis of the parliamentary research, the literature did not investigate the influence of combustion and emission characteristics of compression ignition engines by using various double and trouble injection strategies along with different injector nozzle bore sizes. Also, the initiative was undertaken to study the effect of the different diesel-biodiesel blends ratio studied, SP20 (80% diesel+20% spirulina), Sp40(60% diesel+40% spirulina), and Sp100(0% diesel +100% spirulina) While the scope of the gap expanded to include a comparison of results with baseline diesel fuel. The results show that MPR increased by 4.2%, maximum gas temperature increased by 8.9%, ignition delay increased by 7.9%, maximum heat release rate decreased by 9.5%, NOx decreased by 7.8%, CO2 decreased by 3.9%, and particularly matter emissions decreased by 6.3% were compared to the double injection scheme , at 0.2 mm(INB)
The aim of this study to improve the performance of heat exchanger by using the medium integral fins on the cross flow heat exchanger practically, so, two the heat exchangers from copper were manufactures with eight passes for comparison under different boundary conditions. The water flow rate flow inner the tubes with (2, 3, 4, 5, 6) L/min with inlet temperatures (50, 60, 70) oC, as for the air flow rate were passed outer the tubes by speeds (1, 1.7, 2.3) m/sec. The results show that the medium integral finned tube gives more improvement the heat transfer than the smooth tube about 203.97% and 205.1% was enhancement factor. Motivation: The aim is improvement the heat transfer coefficient for cross flow heat exchanger by using medium integral finned tube. Study the effect of various water stream rate, air speed and inlet water temperature on heat transfer coefficient for them, Finding the cases which enhanced heat transfer for various ranges of air and water as well as inlet temperatures and the speed at the entrance. Develop the empirical correlations for (Nua) of smooth and medium integral finned tubes as function of (Pra) and (Rea).
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