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Article
Effect of Exhaust Gas Recirculation (EGR) on the Performance Characteristics of a Direct Injection Multi Cylinders Diesel Engine

Author: Khalil Ibrahim Abaas
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 1 Pages: 32-39
Publisher: Tikrit University جامعة تكريت

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Abstract

Owing to the energy crisis and pollution problems of today investigations have concentrated on decreasing fuel consumption and on lowering the concentration of toxic components in combustion products by using exhaust gas after treatments methods like PM filters and EGR for NOx reduction. In this study, the combustion characteristics of diesel fuel were compared with that produced from adding EGR at several percentages to air manifold. The tests were performed in a four-cylinder direct injection (DI) diesel engine at constant engine speed (1500 rpm) and variable loads (from no load to 86 kN/m2), the tests were repeated with constant load (77 kN/m2) and variable engine speeds (from 1250 to 3000 rpm).The experimental results showed that adding EGR to diesel engine provided significant reductions in brake power (bp), brake thermal efficiency and exhaust gas temperatures, while high increments in brake specific fuel consumption (bsfc). High EGR percentage (as 30% in this article) caused an 11.7% reduction in brake thermal efficiency, 26.38% reduction in exhaust gas temperatures and 12.28% in volumetric efficiency at full load conditions.


Article
Comparison of Performance Characteristics of LPG and Gasoline - Fuelled Single Cylinder SI Engine

Author: Saad Abdul Qadir Abdul Azeez
Journal: Tikrit Journal of Engineering Sciences مجلة تكريت للعلوم الهندسية ISSN: 1813162X 23127589 Year: 2016 Volume: 23 Issue: 1 Pages: 96-104
Publisher: Tikrit University جامعة تكريت

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Abstract

The investigations have been concentrated on decreasing fuel consumption by using alternative fuels and on lowering the concentration of toxic components in combustion products. LPG as an alternative to gasoline has emerged as a solution to the deteriorating urban air quality problem, especially in an oil country like Iraq. LPG has already been used as cooking fuel in Iraq. In the present paper practical tests of various operating parameters and concerns have been prepared for better understanding of operating conditions and constrains for a LPG fueled internal combustion engine.The results show that HUCR for gasoline was 8:1, and for LPG was 10:1. bsfc reduced by using LPG at its HUCR, while at CR=8:1 it became higher than that for gasoline. Volumetric efficiency reduced by using LPG due to its gaseous nature, but it was improved when the engine was run at HUCR. Brake thermal efficiency depends on bsfc and bp, so LPG preceded gasoline at medium speeds and torques. Exhaust gas temperatures reduced by using LPG, the minimum values were when the engine operated at CR= 8:1. The maximum values were for gasoline share.


Article
PRACTICAL INVESTIGATION OF PERFORMANCE OF SINGLE CYLINDER COMPRESSION IGNITION ENGINE FUELED WITH DUEL FUEL
دراسة عملية لأداء محرك اشتعال بالانضغاط احادي الاسطوانة يعمل بوقود ثنائي

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Abstract

This paper studies the performance of a single cylinder compression ignition engine Ricardo E6, fueled with different blends of ethanol added to diesel.The brake specific fuel consumption for dual fuel, in general, is higher than that for the diesel engine for low and medium loads; however, it becomes less than the diesel engine for high loads. The increase in the proportion of the ethanol in the mixture improves the specific fuel consumption at any specific load. The brake thermal efficiency for diesel engine is higher than that for dual fuel engine for low and medium loads, while it becomes lower for high loads. In general, the addition of ethanol in the mixture improves the efficiency. Retarding the injection timing of diesel fuel caused the specific fuel consumption to increase steadily to about 40% when the timing is too late. The thermal efficiency of dual fuel is lower, in general, than that of the diesel engine when retarding the injection timing.

تضمن هذا البحث دراسة أداء محرك اشتعال بالانضغاط أحادى الاسطوانة نوع Ricardo E6، يعمل بوقود ثنائي بإضافة الأيثانول إلى وقود الديزل بنسب حجمية مختلفة، ومقارنة عمل الوقود الثنائي مع عمل محرك الديزل التقليدي في ظروف تشغيلية مختلفة. إن استهلاك الوقود النوعي المكبحي للوقود الثنائي عموما أعلى من استهلاك وقود الديزل للأحمال المتوسطة والخفيفة، ولكنه يصبح أقل من وقود الديزل عند الأحمال العالية، وزيادة نسبة الأيثانول بالخليط الثنائي تحسن من الاستهلاك عند حمل معين. تكون الكفاءة الحرارية المكبحية للمحرك عند عمله بوقود الديزل أفضل منها لحالة عمله بالوقود الثنائي للأحمال المتوسطة والخفيفة، ولكن يتفوق محرك الوقود الثنائي على محرك الديزل عند العمل بأحمال عالية، إذ تتحسن كفاءته بشكل ملحوظ، وتحسن زيادة نسبة الأيثانول بالخليط من الكفاءة بشكل عام. يزداد الاستهلاك الوقود النوعي المكبحي مع تأخير توقيت حقن الديزل عن التوقيت الأمثل للحقن تدريجيا، ليصل لحدود 40% أعلى من الاستهلاك عند التوقيت الأمثل، وتكون الكفاءة الحرارية للوقود الثنائي أقل عموما من محرك الديزل عند تأخير توقيت الحقن.

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