Hybrid Taguchi–Fuzzy‐based performance‐exhaust emission trade‐off study of variable compression ratio diesel engine fueled with undi‐diesel blends

Abstract

The present investigation highlights the effect of variable compression ratio (VCR) on the performance and exhaust emission characteristics of a single cylinder, direct injection diesel engine fueled with undi‐diesel blends. 10%, 20%, 30%, 40%, and 50% undi fuel have been added to diesel in volumetric proportions and tested by varying compression ratio (CR) from 16:1 to 20:1. Undi addition to diesel fuel significantly improves the brake thermal efficiency (BTE) and brake specific energy consumption (BSEC) of the engine. In addition, higher CR facilitates to improve unburned hydrocarbon (UHC), carbon monoxide (CO) and smoke opacity of the diesel engine with the penalties of higher oxides of nitrogen (NOX) emissions. In perspective of the engine experimental outputs, a Taguchi assisted Fuzzy based trade off study has been conducted to screen and locate the optimal diesel engine operating conditions, namely, CR, undi share, and load. The optimum process parameter has been found to be A2B6C2 with a multi performance characteristics index (MPCI) value of 0.683 indicating the optimum operating conditions of 17:1 CR, 50% (by volume) undi share at 50% load.

Impact of compression ratio on combustion, performance and exhaust emissions of diesel engine fueled with Undi methyl ester-diesel and Undi ethyl ester-diesel blends

“…UEE diesel blends have an average of 1.44% higher BTE than UME Diesel blends when CR is increased from 16:1 to 20:1. The higher viscosity and lower volatility of methyl ester could be the reason for the lower BTE of UME diesel blends than UEE diesel blends which influenced the formation of fine droplets and deteriorated the combustion efficiency [ 13 , 22 ]. The lower calorific value and oxygen content may also be the reason for the lower BTE of UME diesel blends.…”

“…The total uncertainty U of a quantity Q was projected, contingent on the independent variables x 1 , x 2 …, x n having individual errors ∆ x 1 , ∆ x 2 ,…, ∆ x n is given by Eq. ( 1 ) [ 13 , 14 ]) is applied to study and measure the uncertainties of outputs of the VCR CI engine operation under UME and UEE blends. Table 4 – 6 detail the uncertainties of the VCR CI engine performances, computing ranges and precisions of the NPM-MGA-1 exhaust emission analyzer and smoke meter, and total sampling uncertainty (TSU) and standard deviation (SD) of the exhaust emission parameters, respectively.…”

“…Uncertainties are a common and vital measurement in any experimental investigation to verify the accuracy of the experiment that takes place because of the chosen instrument, calibration, environmental condition, observations, scrutiny, and testing plan [ 8 , 13 – 15 ]. The uncertainty of the existing engine performance parameters was analyzed using root-mean-square method.…”

“…As a result of this, few provinces of the world have already banned the use of diesel fueled vehicles, especially in extremely polluted cities like Delhi, India [ 7 – 10 ]. In addition to this, all countries are trying to disentangle the environment-related problems by implementing stringent emission legislations in all transport, power, and industrial sectors [ 11 – 13 ]. In order to meet with the scarcity of fuels in future, a driving force is required to enhance in fuel quality, self-reliance of energy demands with comparatively lesser noxious implication on the environment and augmentation of ruler economy.…”

Effect of pilot fuel injection timing on the performance, combustion, and exhaust emissions of biodiesel–ethanol–diethyl ether blend fueled CRDI engine under hydrogen dual fuel strategies

“…In the modern time, diesel-powered engines play a primal role in the industrial and transportation sectors because of its higher thermal efficiencies. 1 However, diesel-powered engines also play an imperative role in producing higher quantities of toxic emissions like carbon monoxide (CO) and unburned hydrocarbon (UHC). 1,2 Owing to the economic recession caused by COVID-19 outbreak and disruption in stockpile regions, the global fuel price may remain in a volatile state for the next few years.…”