Effect of exhaust gas recirculation and charge inlet temperature on performance, combustion, and emission characteristics of diesel engine with bael oil blends
Abstract:The threat of fossil fuel depletion and augmented environmental pollution caused by diesel fleets can be curbed by adopting suitable fuel and engine modifications. In the present work, effects of engine speed (r/min), injection timing, injection pressure and compression ratio on performance and emission characteristics of a compression ignition engine were investigated. The ternary test fuel of 65% diesel + 25% bael oil + 10% diethyl ether has been used, where the tests have been conducted at different charge … Show more
“…Emissions from internal combustion engines are influenced by the EGT, which is a measure of how much heat is generated during combustion. 21 The exhaust gas temperature provides further information on the efficiency of the engine, the air-to-fuel ratio, the temperature produced by diffusion combustion, and the amount of oxygen that is present. Figure 11 shows that when the concentration of isopropanol increases, EGT decreases.…”
Regulations governing pollution, declining fossil fuel
supply,
and technological breakthroughs in renewable fuels all have a profound
influence on the development of alternative fuels. This current research
focuses on the influence of nanoadditives with alcohol in an exhaust
gas recirculation-cooled engine. As nanoadditives have high thermal
conductivity and alcohol has high oxygen content, they work synergistically
to speed up the catalytic process and increase the combustion rate.
The areca nutshell-reduced graphene oxide with a mass fraction of
25 pmm was ultrasonically blended with two isopropanol–diesel
mixtures 10% isopropanol + 90% diesel (IDR10) and 20% isopropanol
+ 80% diesel (IDR20), respectively, and tested in a single-cylinder,
4-stroke internal-combustion engine at a typical injection timing
of 23° TDC with an EGR rate of 20%. The results of experiments
showed that IDR10 has better combustion and emission parameters than
other fuel blends. Compared to other biodiesel blends, the IDR10 blend
has 2.3% less BSFC and 2.45% more BTE. The IDR10 blend has lower HC
emissions by 42.85%, CO emissions by 33.34%, NO
x
emissions by 2.42%, and smoke emissions by 15.4%.
“…Emissions from internal combustion engines are influenced by the EGT, which is a measure of how much heat is generated during combustion. 21 The exhaust gas temperature provides further information on the efficiency of the engine, the air-to-fuel ratio, the temperature produced by diffusion combustion, and the amount of oxygen that is present. Figure 11 shows that when the concentration of isopropanol increases, EGT decreases.…”
Regulations governing pollution, declining fossil fuel
supply,
and technological breakthroughs in renewable fuels all have a profound
influence on the development of alternative fuels. This current research
focuses on the influence of nanoadditives with alcohol in an exhaust
gas recirculation-cooled engine. As nanoadditives have high thermal
conductivity and alcohol has high oxygen content, they work synergistically
to speed up the catalytic process and increase the combustion rate.
The areca nutshell-reduced graphene oxide with a mass fraction of
25 pmm was ultrasonically blended with two isopropanol–diesel
mixtures 10% isopropanol + 90% diesel (IDR10) and 20% isopropanol
+ 80% diesel (IDR20), respectively, and tested in a single-cylinder,
4-stroke internal-combustion engine at a typical injection timing
of 23° TDC with an EGR rate of 20%. The results of experiments
showed that IDR10 has better combustion and emission parameters than
other fuel blends. Compared to other biodiesel blends, the IDR10 blend
has 2.3% less BSFC and 2.45% more BTE. The IDR10 blend has lower HC
emissions by 42.85%, CO emissions by 33.34%, NO
x
emissions by 2.42%, and smoke emissions by 15.4%.
“…6 Additionally, these are primary harmful emissions sources in terms of cardiovascular and respiratory health. 7 Therefore, many alternative fuel 8–10 and combustion strategies are being explored to achieve lower emissions by the heterogeneous combustion in diesel engines. It is not always possible to replace all of the diesel fuel with another fuel.…”
This paper investigates the effect of ethanol addition and hot exhaust gas recirculation (EGR) on engine performance, exhaust emissions, and air-pollution damage-cost in a dual-fuel diesel engine. The ethanol is injected at low pressure into the intake manifold using a port-fuel injector while diesel fuel is injected directly into the cylinder. Only the duration of the ethanol injection is changed in the dual-fuel injection system while the diesel injection parameters are not changed. Ethanol fuel is added by port injection in such amounts as to provide additional heat energy in the range of 0–40% to the heat energy of the diesel fuel taken to the engine for any engine operating conditions. Moreover, 5%, 10%, and 15% rates exhaust gas recirculation (hot EGR) for each engine operating conditions are applied. The engine is operated at 1400, 1600, 1800 and 2000 rpm engine speeds at full load (≈40 Nm). In this paper, the highest improvement in engine performance and environmental factors is obtained with ethanol addition of 40% without the hot EGR at 1400 rpm. Under these conditions, the brake engine power ( BEP) and brake engine torque ( BET) increase of 6.9% and 8.1% while NOx emission and air-pollution damage-cost decreased of 32% and 23.9%, respectively. However, CO, HC, and smoke ( FSN number) emissions increased significantly. On the other hand, the brake thermal efficiency ( BTE) and brake specific energy consumption ( BSEC) are negatively affected by the ethanol addition and hot EGR.
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