Conceptual study of an internal combustion engine with adjustable cubic capacity and compression ratio

• Grant number: 18/18859-1
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: November 01, 2018
• End date: February 29, 2020
• Field of knowledge: Engineering - Mechanical Engineering - Thermal Engineering
• Principal Investigator: Janito Vaqueiro Ferreira
• Grantee: Caio Henrique Rufino
• Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

This proposal consists of the extension of the project Fapesp Nr 2016/06043-1. The study proposed has the objective of evaluating the advantages of implementing a mechanism that allows an internal combustion engine to adjust its compression ratio and cubic capacity. The study focus on the implementation of such mechanism in spark-ignition engines fuelled with ethanol aiming the adjustment of compression ratio and cubic capacity in order to maximize efficiency. A conventional engine operates at low compression ratio when there is no knock onset, and with a restrained air flow due to throttle actuation at partial loads. By reducing cubic capacity and increasing compression ratio according to the operational condition of the engine, the cited losses can be avoided. Thus, the technology proposed promises to bring a significant gain of efficiency in partial loads conditions. To perform the analysis, it is necessary to develop simulations tools. The simulation model has to be capable of predicting engine performance and knock onset, which is a critical phenomenon influencing compression ratio control. Then, the developed tools have to be validated with experimental results obtained from a conventional engine. Afterwards, with the validated simulation tools implemented and validated, the operation of the proposed engine can be estimated. After the simulations being performed, a prototype will be tested in bench and the obtained results will be compared with the results found in the simulations, validating then and indicating the benefits gained with the implementation of the technology. In the previous project, the development and validation of the simulations tools have been already completed. The new proposal for extension of the project consists of the final part of the research, which comprehends the completion of the simulations predicting the operation and the execution of experimental tests for validation on the prototype. (AU)

Scientific publications

(7)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

RUFINO, CAIO HENRIQUE; TRUTA BESERRA DE LIMA, ALESSANDRO JOSE; MIN ALLAH, FAZAL UM; FERREIRA, JANITO VAQUEIRO; RIBEIRO GALLO, WALDYR LUIZ. Study on combustion irreversibility in turbocharged spark-ignition engines. INTERNATIONAL JOURNAL OF EXERGY, v. 35, n. 1, SI, p. 19-34, 2021. (18/20394-7, 13/50238-3, 18/18859-1)

RUFINO, CAIO H.; FERREIRA, V, JANITO. Study on the efficiency of a spark-ignition variable displacement and compression ratio engine. INTERNATIONAL JOURNAL OF ENGINE RESEARCH, v. 22, n. 8, AUG 2020. (18/18859-1)

DE LIMA, A. J. T. B.; RUFINO, C. H.; FERREIRA, V, J.; GALLO, W. L. R.. Study on Exergy Recovery in Hybrid Vehicles via Wastegate Losses. INTERNATIONAL JOURNAL OF THERMODYNAMICS, v. 23, n. 1, p. 43-51, 2020. (13/50238-3, 18/18859-1)

RUFINO, CAIO H.; GALLO, WALDYR L. R.; FERREIRA, V, JANITO. Diagnosis of hydrous ethanol combustion in a spark-ignition engine. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING, v. 235, n. 1, JUL 2020. (18/18859-1)

RUFINO, CAIO HENRIQUE; TRUTA BESERRA DE LIMA, ALESSANDRO JOSE; MIN ALLAH, FAZAL UM; FERREIRA, JANITO VAQUEIRO; RIBEIRO GALLO, WALDYR LUIZ. Study on combustion irreversibility in turbocharged spark-ignition engines. INTERNATIONAL JOURNAL OF EXERGY, v. 35, n. 1, p. 16-pg., 2021-01-01. (18/18859-1, 13/50238-3, 18/20394-7)

MIN ALLAH, FAZAL UM; RUFINO, CAIO HENRIQUE; ZABEU, CLAYTON BARCELOS; RIBEIRO GALLO, WALDYR LUIZ; DUMITRU, I; RACILA, L; COVACIU, D; ROSCA, A. Investigating the Cyclic Variability of a Multi-cylinder Turbocharged Direct-Injection Spark-Ignition Engine Fueled with E10. 30TH SIAR INTERNATIONAL CONGRESS OF AUTOMOTIVE AND TRANSPORT ENGINEERING: SCIENCE AND MANAGEMENT OF AUTOMOTIVE AND TRANSPORTATION ENGINEERING, v. N/A, p. 11-pg., 2020-01-01. (18/18859-1, 18/20394-7)

MIN ALLAH, FAZAL UM; RUFINO, CAIO HENRIQUE; RIBEIRO GALLO, WALDYR LUIZ; ZABEU, CLAYTON BARCELOS; ASME. INVESTIGATING THE EFFECTS OF ENGINE OPERATING CONDITIONS ON THE CYCLIC VARIABILITY OF A COMMERCIAL FLEX-FUEL ENGINE. PROCEEDINGS OF THE ASME INTERNAL COMBUSTION ENGINE FALL TECHNICAL CONFERENCE, 2019, v. N/A, p. 12-pg., 2020-01-01. (18/18859-1, 18/20394-7)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

RUFINO, Caio Henrique. Estudo conceitual de um motor com cilindrada e taxa de compressão ajustáveis. 2020. Doctoral Thesis - Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica Campinas, SP.