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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

TURBULENT PROPERTIES IN IC ENGINE DERIVED FROM WALL HEAT FLUX MEASURED WITH A THREE POINT THIN FILM SENSOR

Get access (open in a dialog) DOI: 10.1615/IHTC16.tpm.023077
pages 8850-8857

Abstract

Novel heat flux sensor for detecting turbulent heat transfer characteristics of the IC engines has been developed in a national project named "SIP innovative combustion technology". A three point thin film RTD type heat flux sensor measures heat flux trends simultaneously at three adjacent points under a harsh environment in the engines. The measured heat flux trends are so clear that fluctuations from the turbulence can be observed. Derivation method of the turbulent properties, such as orthogonal two components of velocity along the inner wall, vorticity normal to the wall and turbulent scale affecting on the heat flux, were developed. The velocity and vorticity can be calculated from a geometry of the sensor arrangement and a cross-correlation analysis which derives a traveling time of the turbulent eddy between the sensors. The turbulent scale can be derived from the velocity and an auto-correlation analysis deriving a passing time of the turbulent eddies over the sensor. From a measured heat flux trends taken in a laboratory engine over 200 cycles, mean and fluctuation values of the turbulent properties were obtained. It is demonstrated that the turbulent characteristics in the engine combustion chamber can be detected through the heat flux measurement with the novel three point heat flux sensor.