VALIDATION OF A BLOWBY MODEL USING EXPERIMENTAL RESULTS IN MOTORING CONDITION

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ABDI AGHDAM E.; RAHIMI M.; KABIR NAJAFI M.M.

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Journal Paper

Paper Information

Journal: THE JOURNAL OF ENGINE RESEARCH Year:2008 | Volume:5 | Issue:12 Page(s): 9-14

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Title

VALIDATION OF A BLOWBY MODEL USING EXPERIMENTAL RESULTS IN MOTORING CONDITION

Author(s)

ABDI AGHDAM E. | RAHIMI M. | KABIR NAJAFI M.M. | Issue Writer Certificate

Keywords

BLOWBYQ3

THERMODYNAMIC MODELQ3

GAS FLOWQ3

MASS LOSS AND CYLINDER PRESSUREQ3

Abstract

BLOWBY and GAS FLOW through the cylinder-pis ton-ring crevices are phenomena affecting the engine performance and the amount of exhaust pollutants. Also these phenomena affect the cylinder pressure, cyinder temperature and the charge amount during a cycle. The study and validation of a sub-model for these phenomena in the absence of combustion deducts the effects arisen from the combustion event. In the present study, BLOWBY sub-model and GAS FLOW through crevices under motoring conditions have been investigated using a volume and orifice theory and the experimental results are measured from a research engine. BLOWBY geometric parameters, consisting of a few critical cross-sectional areas (orifice areas) and volumes (top land and inter-ring crevice volumes), were measured in ambient temperature and corrected for hot running conditions. The cylinder pressure during the cycle operation was measured by a piezoelectric pressure transducer and the low pressure parts of the cycle were measured using a piezoresistive pressure transducer for referencing purposes. The obtained results showed a very good agreement between experimentally measured pressure data and model output for three compression ratios of 7.6, 10.2, 12.4 and three engine speeds of 750, 1500 and 2000 rpm, so that the maximum deviation was almost 5%. The model prediction shows that the maximum mass loss increases by increasing the compression ratio and decreases by increasing engine speed. Also the peak mass loss position occurs within the range of 3 to 9°CA after Top Dead Center. Since then, a reverse flow from the top land crevice into the cylinder is predicted in the model.

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APA: Copy

ABDI AGHDAM, E., RAHIMI, M., & KABIR NAJAFI, M.M.. (2008). VALIDATION OF A BLOWBY MODEL USING EXPERIMENTAL RESULTS IN MOTORING CONDITION. THE JOURNAL OF ENGINE RESEARCH, 5(12), 9-14. SID. https://sid.ir/paper/135605/en

Vancouver: Copy

ABDI AGHDAM E., RAHIMI M., KABIR NAJAFI M.M.. VALIDATION OF A BLOWBY MODEL USING EXPERIMENTAL RESULTS IN MOTORING CONDITION. THE JOURNAL OF ENGINE RESEARCH[Internet]. 2008;5(12):9-14. Available from: https://sid.ir/paper/135605/en

IEEE: Copy

E. ABDI AGHDAM, M. RAHIMI, and M.M. KABIR NAJAFI, “VALIDATION OF A BLOWBY MODEL USING EXPERIMENTAL RESULTS IN MOTORING CONDITION,” THE JOURNAL OF ENGINE RESEARCH, vol. 5, no. 12, pp. 9–14, 2008, [Online]. Available: https://sid.ir/paper/135605/en

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