On heat transfer measurements in diesel engines using fast-response coaxial thermocouples

Journal Article · Sat Jul 01 00:00:00 EDT 1989 · Journal of Engineering for Gas Turbines and Power; (USA)

DOI:https://doi.org/10.1115/1.3240276· OSTI ID:7010485

Assanis, D N; Badillo, E ^[1]

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1. Dept. of Mechanical and Industrial Engineering, Univ. of Illinois at Urbana-Champaign, IL (US)

The authors discuss the development of finite element models of fast-response CO-AX thermocouples typically used for heat transfer measurements in diesel engines. Due to the small differences in thermal properties between the thermoelements and the iron engine components, CO-AX thermocouples are capable of measuring transient temperatures of iron components within an accuracy of 98 percent. However, these relatively small errors in temperature measurement result in as high as 25 percent errors in peak surface heat flux calculations. This implies that heat flux results depend not only on the temperature of the surface thermocouple junction, but are also sensitive to its time rate of change. Increasing the thin film thickness can significantly alter the heat flux deduced from surface junction temperatures.

• OSTI ID: 7010485
• Journal Information: Journal of Engineering for Gas Turbines and Power; (USA), Journal Name: Journal of Engineering for Gas Turbines and Power; (USA) Vol. 111:3; ISSN JETPE; ISSN 0742-4795
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CALCULATION METHODS
DIESEL ENGINES
ENERGY TRANSFER
ENGINES
FINITE ELEMENT METHOD
HEAT ENGINES
HEAT FLUX
HEAT TRANSFER
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MEASURING METHODS
NUMERICAL SOLUTION
THERMOCOUPLES