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In this research, gasoline engine performance and emission characteristics were studied when powered by diisopropyl ether-gasoline blends. The main objective of this study is to determine the behavior of diisopropyl ether-gasoline blends at various engine speeds and compression ratios. Further, the engine parameters were optimized using the response surface methodology. Enriched oxygen, higher latent heat of vaporization, and the readily volatile nature of the fuel enhanced the brake thermal efficiency and lowered the hydrocarbons and carbon monoxide due to a better combustion rate. The developed model exhibited superior R2 values with a 0.957 desirability factor. The optimum parameters such as speed, compression ratio, and fuel-blend concentrations were found at 2250 rpm, 10:1, and D25 (75% gasoline and 25% diisopropyl ether), respectively. The responses for the optimal input parameters were brake thermal efficiency (31.53%), specific fuel consumption (0.2923 kg/kWh), carbon monoxide (0.14% by Vol.), hydrocarbons (31 ppm), and oxides of nitrogen (708 ppm). The predicted values for optimum engine parameters were validated with the experimental data, and their percentage of absolute error was found to be less than 5%. Thus, the study concludes that diisopropyl-ether gasoline blends can be used as an alternative fuel to enhance the brake thermal efficiency and reduce the pollution level, and the proposed numerical model can predict the responses with high accuracy. WOS:000862659300004 Q1

With growing concerns regarding the environment and the depletion of fossil fuels, many researchers have sought a new and suitable alternative fuel. Over the years, researchers have proposed many alternatives to gasoline, most of which belong to the family of alcohols. Furthermore, most researchers consider the octane number to be the main fuel property and have overlooked other fuel properties. In the family of ethers, MTBE and ETBE have been previously studied, but DIPE, a suitable, novel and safe alternative fuel that doesn’t mix with water, has not. In this study, diisopropyl ether, a novel oxygenate, is blended with gasoline, and the density, calorific value, Reid vapour pressure, distillation curve, drivability index, research octane number and anti-knock index are studied and reported here.

Global concern over rising greenhouse gas emission levels and the availability of fossil fuels has led to the development of biofuels, and the use of gasoline formulations with oxygenated compounds has become common practice for improving fuel quality. This empirical study evaluated the effects of oxygenated gasoline fuel blends on air quality. Tests were conducted on a four-stroke, four-cylinder multi-point fuel injection (MPFI) spark ignition (SI) engine using an eddy current dynamometer to investigate the combustion and emissions behaviour of n-butanol blends. Blends comprising n-butanol (N10, N20, and N30) and unleaded gasoline were tested over a rotational speed range of 1400 rpm–2800 rpm under a constant load of 20 Nm. The results obtained indicate that use of n-butanol blends produced lower hydrocarbon (HC) and carbon monoxide (CO) levels than unleaded gasoline but nitrogen oxide (NO x ) emissions were found to be higher. When ignition timing was retarded, NOx emissions for all n-butanol blends decreased. The peak in-cylinder pressures and heat release rates for the blends were also found to be higher than for unleaded gasoline (UG). COV IMEP of gasoline was higher than that of n-butanol/gasoline blends.

With growing concerns about environmental pollution caused by automobiles, biofuels containing oxygen – also known as oxygenates – are being researched very rigorously. In this article, we have inspected the use of isopropanol/gasoline blends, as fuel in a 4 – cylinder Spark Ignition engine with Multi-Point Fuel Injection System. Isopropanol was mixed with Unleaded Gasoline in proportions of 10, 20 and 30% by volume (IPA10, IPA20 and IPA30). It is found that with the use of isopropanol/gasoline blends in Spark Ignition Engine, Brake Thermal Efficiency and NOx emissions increased whereas carbon monoxide and hydrocarbon emissions decreased. When the spark timing was retarded by 2 degrees, it was found that isopropanol/gasoline blends emitted lower NOx emissions than those at original spark timing. Isopropanol blends also increased the in-cylinder pressure values and heat release rate values.

In this study, we compared three different blended (20/80 by vol .) biodiesels of rice bran, neem, and cottonseed oils with varying degree of unsaturation. All three biodiesel blends decreased the brake thermal efficiency and increased the exhaust gas temperature of a single-cylinder diesel engine. They decreased CO, hydrocarbon, and smoke emissions, but increased NO x emissions. The biodiesels provided better combustion characteristics than diesel. Of all the tested biodiesel blends, rice bran oil biodiesel decreased CO and hydrocarbon emissions the most, albeit at the cost of increasing NO x emissions. CO, HC, and smoke emissions decreased with the increase in degree of unsaturation, whereas NOx emissions increased with the increase in degree of unsaturation.

With growing concerns about environmental pollution and depletion of fossil fuel resources, various biofuels have been assessed. In this paper, the performance and emission characteristics of sapote seed oil methyl ester blends were studied. Sapote seed oil methyl ester was blended with diesel in increments of 5%. Additionally, 5% diethyl ether was added to all blends with sapote seed oil methyl ester in order to reduce the overall viscosity of the blends. It was observed that with an increase in the proportion of sapote seed oil methyl ester in the blend, CO, HC emissions and smoke opacity decreased. Similarly, with an increase in sapote seed oil methyl ester content in the blend, brake thermal efficiency, exhaust gas temperature and NOx emissions also increased.

In this study, the effects of diisopropyl ether (DIPE)-gasoline (D10, D20, and D30) fuel blends on the performance, combustion, and emission characteristics of a spark ignition engine were investigated. In the study a four-stroke, four-cylinder multi-point fuel injection system (MPFI) engine with an eddy current dynamometer was used. The tests were performed at speeds between 1400 rpm and 2800 rpm under the load conditions of 20 N m and 25 N m. The results obtained from the DIPE-gasoline blends were compared with gasoline fuel. The DIPE-gasoline blends produced higher brake thermal efficiency, in-cylinder pressure, and heat release rates as compared to gasoline fuel. From emission point of view hydrocarbon (HC) and carbon monoxide (CO) emissions were found lesser, whereas carbon dioxide (CO2) and nitrogen oxide (NOx) emissions were observed higher in case if DIPE-gasoline blends compared to gasoline. However, retarding the ignition timing resulted in reduced NOx emission in DIPE-gasoline blends.