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Radwan, M.S.
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Knock and Pre-Ignition in Spark-Ignition Engine Fuelled by Different Blends of Jojoba Bio-Gasoline with Kerosene

Helwan University-M.S. Radwan, Youssef A. Attai, Y.I. Hassan
Published 2019-05-17 by SAE International in United States
In the present article, the knock tendency and pre-ignition resistance (PIR) were determined experimentally for different blends of kerosene and jojoba bio-gasoline. The effects of varying equivalence ratios, rotational speed, inlet air temperature and pressure, and ignition timing on knock tendency and PIR were investigated. The influence of compression ratio on PIR was also studied. Jojoba bio-gasoline was synthesized using transesterification method through performing a chemical reaction between well-stirred jojoba raw oil and alcohol. Experiments were carried out on a Ricardo E6/MS variable compression ratio spark-ignition (SI) engine fuelled by jojoba bio-gasoline/kerosene blends of volumetric percentages of 0%, 5%, 10%, 15%, and 20% jojoba bio-gasoline. The onset of pre-ignition and knock were detected by observing the pressure oscillations using a piezoelectric pressure transducer, a synchronizing magnetic sensor, and a degree-marking probe. The results showed that increasing the percentage of bio-gasoline in the blends with kerosene leads to a significant increase in PIR and a remarkable decrease in the knock tendency. This will lead to the design of a more efficient engine by increasing its compression…
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The Effect of Cowling on the Local Cooling Effectiveness of Engine Air-Cooled Cylinders

University of Helwan-M.S. Radwan, M.A. Shahin
Published 1992-02-01 by SAE International in United States
In this work, the effect of providing air-cooled cylinders with cowlings on the local cooling effectiveness was investigated. Cast-iron specimens representing air-cooled cylinders were manufactured with rectangular and trapezoidal fins. Fifteen cowlings were manufactured to provide for various cowling parameters namely: cowling diameter to fin diameter ratio, cowling tail length to fin diameter ratio, cowling tail width to fin diameter ratio and cowling tail angle. A specially designed test rig was manufactured for this purpose. It mainly consists of an air blower, air heating box, orifice plate flowmeter and a test-section. The test variables included the air flow velocity, air temperature and heat flux. Local heat-transfer data were gathered using micro-thermo-couples embedded in the front, side and rear of the specimens representing air-cooled cylinder. Particular attention was given to the rear part of the finned cylinder (opposite to the direction of air flow). That part was always the hottest part and thus can promote cylinder scuffing and large thermal stresses due to the large circumferential temperature variation. In this respect, the optimum cowling parameters were…
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On the Ignition Performance of Some Coal Derived Diesel Engine Fuels

University of Helwan-M.S. Radwan, A.Y. Abdallah, K.E.H. Mahrous
Published 1991-10-01 by SAE International in United States
In this work, the thermal ignition delay of some coal-derived liquid fuels and their blends with Phillips D-2 diesel fuel was measured. For this purpose, a shock-tube test set up was designed and manufactured. It was fully instrumented for delay measurement with piezo-electric pressure transducers, charge amplifiers, storage oscilloscope and electronic plotter. The test variables included the type of fuel, equivalence rlatio, ignition pressure and ignition temperature. It was found that coal-derived fuels exhibit a longer ignition delay than light diesel fuel, primarily because of its higher aromatic content. Rich and lean mixtures produce long delay whilst the minimum delay occurred at the stoichiometric mixture. Higher ignition pressures and temperatures reduced the delay. The fuels that were considered suitable for high speed engines were singled out; also those suitable for medium and slow speed engines were put forward. A correlation was developed to predict the data which read: Arrhenius plots were made to evalaute the activation energy of each test fuel.
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