Experimental assessment for instantaneous temperature and heat flux measurements under Diesel motored engine conditions

Abstract

The main goal of this work is to validate an innovative experimental facility and to establish a methodology to evaluate the influence of some of the engine parameters on local engine heat transfer behaviour under motored steady-state conditions. Instantaneous temperature measurements have been performed in order to estimate heat fluxes on a modified Diesel single cylinder combustion chamber. This study was divided into two main parts. The in order to understand local behaviour of heat transfer in an internal combustion engine, and the influence of engine parameters on local instantaneous temperature and heat flux, have been analysed.

Optimisation-oriented modelling of the NOx emissions of a Diesel engine

“…The second term in the brackets approximates the temperature of the cylinder-charge fraction not participating in the combustion and thus forming the ''cushion'' between the burning regions and the cylinder walls. A more detailed analysis of the heat balance and the heat transfers in a cylinder can be found in [28,29]. The air mass entering the cylinder depends on the engine-out temperature since the residual-gas mass is mainly defined by the exhaust-gas density as described in Section 3.1.…”

Gradient heat flux measurement as monitoring tool for the diesel engine

“…The research was conducted on Indenor XL4D, four-cylinder, four-stroke, water cooled, divided chamber, medium-high speed diesel engine of automobile duty. The engine has total displacement volume of 1.357 cm 3 , a cylinder bore of 78 mm, a piston stroke of 71 mm, a compression ratio of 23, maximum power of 35 kW at 5000 revolutions per minute (rpm), maximum torque of 84.3 N•m at 2500 rpm. Figure 1 shows draw of the measurement system.…”

“…At present time heat flux is measured by heat flux sensors based on thermocouples and resistance thermometer. In some cases, pressure sensors are used to calculate gas temperature which in turn is needed to estimate heat flux [1][2][3][4][5]. However, current types of heat flux sensors cannot measure heat flux directly, also they have response time equal to time of working cycle but for accurate measuring response time should be several times less [6,7].…”

Flow effects due to valve and piston motion in an internal combustion engine exhaust port

“…These large, energy containing structures and their behavior influence the heat http transfer. Torregrosa et al [3] found experimentally that the transient heat transfer is primarily affected by the gas temperatures in the cylinder rather than the cylinder wall temperatures. Therefore, the assessment of the flow structures evolving in the exhaust port is important.…”