Theoretical Study of Engine Performance Working on Methanol-Gasoline Blends (original) (raw)
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International Journal of Environment and Pollution, 2005
This study investigates the effect of methanol addition to low octane number gasoline, in terms of calorific value, octane number, compression ratio at knocking and engine performance. Locally produced gasoline (octane number = 87) was blended with five different percentages of methanol, namely 5%, 10%, 15%, 20% and 25% on volume basis. The properties of the respective fuel blends were first determined. Then they were tested in an engine. It was found that the octane number of gasoline increases continuously and linearly with methanol percentages in gasoline. Hence, methanol is an effective compound for increasing the value of the octane number of gasoline. Also, it was found that the engine performance improves as the percentage of methanol increases in the blend within the range studied.
The use of blend methanol at High Compression Ratio in spark-ignition engine
IJSRD, 2013
it can be obviously seen the world's fossil fuel reserves are limited. It is well known those passenger vehicles are dependent on fossil fuels such as gasoline, diesel fuel, liquefied petroleum gas, and natural gas. The fossil fuel used in passenger vehicles induces the air pollution, acid rains, build-up of carbon dioxide and crude oil; petroleum product will become very scarce and costly. Hence, there is a progressively interest related with using non-fossil sources in vehicles. Especially, the alcohol fuels (methanol, ethanol etc.) have been showed good candidates as alternative fuels for the vehicles equipped with SI. In this experimental study, the effect of methanol (30% and 40%) with gasoline (70% and 60%) tested to measure the performance and emission of 4- cylinder spark ignition multi-port fuel injection (MPFI) engine. The tests with/without methanol blends and increase compression ratio 8.8:1 to 11:1 were performed on a rope belt dynamometer while running the engine at speed 1500 rpm at different varying engine load. In these tests measure engine performance parameters like engine torque, brake specific fuel consumption, brake thermal efficiency and exhaust emission. After experimental investigations to measure engine power increase 10.6%, brake specific fuel consumption decrease 4.2%, brake thermal efficiency increase and exhaust gas emission is decrease with use of methanol blend fuel with gasoline.
Effects of Methanol Addition to Gasoline on the Performance and Fuel Cost of a Spark Ignition Engine
Energy & Fuels, 2008
This study is concerned with investigating experimentally the effects of methanol blending to base gasoline on the performance and fuel cost of a spark ignition (SI) engine. The fuel blends were prepared by blending 5, 10, 15, and 20 vol % of methanol with a specified amount of base gasoline. These fuel blends were designated as M5, M10, M15, and M20, respectively. Base, leaded, and unleaded gasolines were also used in the study. The experiments were conducted under various engine speeds, spark timings (STs), and compression ratios (CRs). The engine was operated under wide-open-throttle (WOT) conditions. The result of the study showed that the M5 blend yields the best engine performance in terms of the brake mean effective pressure (bmep), while the M20 blend suggests the best performance in terms of brake thermal efficiency (bte). The economical analysis performed in the study is based on both the current blending fuel prices in Turkey and brake-specific fuel consumption (bsfc) of the engine while using base gasoline and gasoline-methanol blends. It was obtained that, in contrast to the improvement of engine performance, methanol blending caused an increase in the consumed fuel cost because of the expensive methanol price in Turkey. The increments in the cost of the fuel blends compared to base gasoline were determined as 18. 86, 36.95, 54.20, and 73.01% for M5, M10, M15, and M20, respectively. Uncertainty analysis was also performed in this study, and it was found that the uncertainties in the measurement devices do not have noticeable influences on the variations of engine characteristics.
Effect of Methanol Addition on the Performance of Spark Ignition Engines
Energy & Fuels, 2004
This study is an experimental investigation into the effect of methanol addition to gasoline on the performance of spark ignition engines. The performance tests were carried out, at wide open throttle and variable speed conditions, over the range of 1000 to 2500 rpm, using various blends of methanol-gasoline fuel. It was found that methanol has a significant effect on the performance of the gasoline engine. The best engine performance (within the range studied) for maximum power output, and minimum brake specific fuel cosumption, occurs when a mixture of 15 volume percent methanol and 85% gasoline blend is used. The addition of methanol to gasoline increases the octane number, thus engines fueled with methanol-gasoline blend can operate at higher compression ratios.
Numerical and Experimental Studies on Combustion Engines and Vehicles
The aim of this study is to develop the one-dimensional model of a four-cylinder, four-stroke, multi-point injection system SI engine and a direct injection system SI engine for predicting the effect of various fuel types on engine performances, specific fuel consumption, and emissions. Commercial software AVL BOOST was used to examine the engine characteristics for different blends of methanol and gasoline (by volume: 5% methanol [M5], 10% methanol [M10], 20% methanol [M20], 30% methanol [M30], and 50% methanol [M50]). The methanol-gasoline fuel blend results were compared to those of net gasoline fuel. The obtained results show that when methanol-gasoline fuel blends were used, engine performance such as power and torque increases and the brake-specific fuel consumption increases with increasing methanol percentage in the blended fuel.
Engineering Science and Technology, an International Journal, 2015
This study discusses performance and exhaust emissions from spark-ignition engine fueled with ethanol emethanolegasoline blends. The test results obtained with the use of low content rates of ethanol emethanol blends (3e10 vol.%) in gasoline were compared to ethanolegasoline blends, methanol egasoline blends and pure gasoline test results. Combustion and emission characteristics of ethanol, methanol and gasoline and their blends were evaluated. Results showed that when the vehicle was fueled with ethanolemethanolegasoline blends, the concentrations of CO and UHC (unburnt hydrocarbons) emissions were significantly decreased, compared to the neat gasoline. Methanolegasoline blends presented the lowest emissions of CO and UHC among all test fuels. Ethanolegasoline blends showed a moderate emission level between the neat gasoline and ethanolemethanolegasoline blends, e.g., ethanolegasoline blends presented lower CO and UHC emissions than those of the neat gasoline but higher emissions than those of the ethanolemethanolegasoline blends. In addition, the CO and UHC decreased and CO 2 increased when ethanol and/or methanol contents increased in the fuel blends. Furthermore, the effects of blended fuels on engine performance were investigated and results showed that methanolegasoline blends presents the highest volumetric efficiency and torque; ethanolegasoline blends provides the highest brake power, while ethanolemethanolegasoline blends showed a moderate level of volumetric efficiency, torque and brake power between both methanolegasoline and ethanol egasoline blends; gasoline, on the other hand, showed the lowest volumetric efficiency, torque and brake power among all test fuels.
Journal of Multidisciplinary Engineering Science and Technology (JMEST), 2019
were performed in a port injected spark ignition (SI) race car engine with pentroof geometry. The study was performed for a premixed case with one-step global reaction mechanisms for gasoline, gasoline-methanol and gasoline-methanol-water blends of 1.8%, 3.6% and 5.4% at stoichiometric conditions. The purpose of the study was to analyze the combustion and thermal efficiency as well as the indicated power and emissions with and without methanol/water enrichment. The model was tested using a numerical simulation code that solves compressible, turbulent, threedimensional transient equations. These equations apply to reacting multicomponent gas mixtures with flow dynamics of an evaporating liquid spray. The simulations performed provided a comparative analysis between the gasoline, the gasoline-methanol and the gasoline-methanolwater global mechanisms. The engine geometry used in this study was ø101.6 mm bore and 88.4 mm stroke, running at 6500 rpm. Earlier joint computational experimental studies performed by the researchers have shown that injection of a secondary fuel in small quantities in conjunction with the base fuel could lead to marked combustion process improvements and thermal efficiency. The secondary fuel had only a small contribution to the total engine heat release, but, it improved engine efficiency by increasing flame speed and ensuring a more complete combustion process for the base fuel. Secondary fuel enrichment in a small amount to the air-fuel charge results in efficient engine operation with lean air-fuel mixture. Results showed aggressive burning of gasoline while using methanol and methanol-water blends. Addition of methanol encouraged complete burn of the fuel. Increase in indicated power, and thermal efficiency were observed with an increase in methanol percentage. The trend was visible during all methanol enrichments. With the increase in the methanol concentration, the average temperature and maximum temperature inside the cylinder slightly decreases. This is significant because as the percentage of methanol increases in the fuel, the result is higher efficiencies, complete combustion, and slightly lower temperatures inside the cylinder with fewer emissions.
International journal of applied engineering research, 2017
The effect of methanol-gasoline blends on the engine performance and combustion characteristics have been investigated experimentally. In this work a 4-storke cylinder digital twin spark ignition engine is used. The tests were performed at different loads for blends such as M10, M15, M20, M25, M30, as well as for pure gasoline also at 32BTDC for one spark plug and 28BTDC for the other one. The results shows improvement in physical properties by adding methanol since methanol is volatile than gasoline. The experimental results revealed that the fuel consumption and brake thermal efficiency is increased by increasing methanol content in blends. The emission results shows decrease in CO, UBHC, NOx.
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2024
Finding substitute fuels has been more popular in recent years as a response to escalating pollution levels and fuel shortages. The goal of this research is to find the ideal gasoline to ethanol ratio that will maximize engine performance and reduce emissions in spark ignition engines. In order to analyse the performance of different blending ratios, the research looks at metrics such carbon monoxide (CO) emissions, brake power (BP), brake specific fuel consumption (BSFC), and brake thermal efficiency (BTE).
Engineering Science and Technology, an International Journal
The aim of this study, which is the first of its kind, is to compare experimentally the effects of different ternary blended fuels, e.g., ethanol-methanol-gasoline (EM), n-butanol-iso-butanol-gasoline (niB) and iso-butanol-ethanol-gasoline (iBE), on engine performance, combustion and pollutant emission characteristics to demonstrate the best potential one from these ternary fuel blends as alternative to fossil fuel. The experiments were performed at similar operating conditions and low content rates of fuel blends (3-10 vol% in gasoline) with varying engine speeds between 2600 and 3400 r/min at half throttle opening position of spark ignition engine. The results showed that the engine performance (volumetric efficiency, torque and brake power) increased, while pollutant emissions (carbon monoxide (CO) and unburnt hydrocarbons (UHC)) decreased at using EM fuel blends, compared to other blended fuels. It was also found that the highest emissions and the lowest performance among the blended fuels are introduced by niB, while iBE presented a moderate level of performance and emissions between niB and EM. On the other hand, the performance of niB and iBE is lower than the base fuel (neat gasoline) but EM showed a higher performance than the base fuel. The emissions of EM, niB and iBE are all lower than the base fuel.