Abstract
The usage of gradient heat flux measurement for monitoring of heat flux on combustion chamber surface and optimization of diesel work process is proposed. Heterogeneous gradient heat flux sensors can be used at various regimes for an appreciable length of time. Fuel injection timing is set by the position of the maximum point on the angular heat flux diagram however, the value itself of the heat flux may not be considered. The development of such an approach can be productive for remote monitoring of work processes in the cylinders of high-power marine engines.
Highlights
The understanding of the heat exchange in the combustion chamber is key in improving engine efficiency
In this work instantaneous heat flux was measured for two different regimes: motored and fire operation
It can be seen that the maximum of heat flux is near “hot” top dead center (TDC) [2] and occurs earlier than maximum of wall temperature [12,13,14,15,16,17]
Summary
The understanding of the heat exchange in the combustion chamber is key in improving engine efficiency. The rapid changes in gas temperature, pressure and velocity field contribute to its complexity resulting in a highly transient and spatial nature of the heat flux. Heat transfer measurements inside the combustion chamber pose a challenge in instrumentation due to the harsh environment. At present time heat flux is measured by heat flux sensors based on thermocouples and resistance thermometer. Pressure sensors are used to calculate gas temperature which in turn is needed to estimate heat flux [1-. Current types of heat flux sensors cannot measure heat flux directly, they have response time equal to time of working cycle but for accurate measuring response time should be several times less [6, 7]
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