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In this study, the effects of diethyl ether (DEE)-diesel fuel blends on the performance of a diesel engine investigated experimentally at various operating conditions. In the experiments, the blends prepared with the addition of 2.5, 5, 7.5, and 10 vol. % of DEE with a specified amount of diesel fuel and neat diesel fuel were used. The experiments were performed for various engine speeds and compression ratios at wide open throttle conditions by using a single cylinder direct injection (DI) diesel experimental engine. The results of the study show that DEE addition to diesel fuel causes to decrease in engine performance parameters, i.e., brake mean effective pressure, brake torque and brake power. The decrement in performance parameters increased with increasing blending ratio. The decrement of brake mean effective pressure was obtained as about 5.1% with DEE10 blend at the operating conditions of r =20 and N=1200 rpm. However, brake thermal efficiency increases and brake specific fuel consumption decreases up to 7.5% DEE blending ratio. The increment of brake thermal efficiency was obtained as about 10.9% with DEE7.5 blend at the operating conditions of r =20 and N=1200 rpm. The same fuel blend gives about 8.7% reduction in brake specific fuel consumption. Additionally, exhaust gas temperature decreases and air excess coefficient increases with increasing DEE blending ratio. Moreover, the results obtained by DEE7.5 blend at various compression ratios shows that the increment in compression ratio beyond a certain level affects negatively the engine performance. [ABSTRACT FROM AUTHOR]

In this study, the effects of diethyl ether (DEE)-diesel fuel blends on the performance of a diesel engine investigated experimentally. The blends were prepared with the addition of 2.5, 5, 7.5, and 10 vol. % of DEE with a specified amount of diesel fuel. In the experiments, a single cylinder direct injection (DI) diesel experimental engine was used and compression ratio was fixed at 20. The experiments were performed with neat diesel fuel and DEE-diesel fuel blends at various engine speeds and wide open throttle conditions. The results of the study show that DEE addition to diesel fuel causes to decrease in engine performance parameters, i.e., brake mean effective pressure, brake torque and brake power. The decrement in performance parameters increased with increasing blending ratio. The maximum decrement in brake mean effective pressure was obtained with DEE10 blend as about 5.1%. However, brake thermal efficiency increases and brake specific fuel consumption decreases up to 7.5% DEE blending ratio. The maximum increment in brake thermal efficiency was obtained with DEE7.5 blend as about 10.9%. The same fuel blend gives about 8.7% reduction in brake specific fuel consumption. Additionally, exhaust gas temperature decreases and air excess coefficient increases with increasing DEE blending ratio. [ABSTRACT FROM AUTHOR]