An experimental study of heat loss and spatially temperature distributions of the impinging plate
2022-01-0607
03/29/2022
- Event
- Content
- Spray impingement tends to occur in compact-size engines and it affects the fuel-air mixing, local heat transfer between fluid and solid, and possibly leads to fuel deposition on the hard surface. The deposits which are typically called “film” become one of the main sources of soot particles generated in the subsequent combustion. Wall temperature is one of the factors that affect fuel deposition. A higher wall temperature would enhance the film evaporation and reduces the risks of fuel deposition to partially avoid the soot particles formed from the film. Also, the wall temperature would affect the ignition characteristics such as ignition delay and ignition location. However, in realistic operating engines, the wall temperature is not consistent but changed by the heat conduction from charge gas and heat convection when the spray hits the wall and propagates near the surface. Due to the arrangement of injectors in the engines, an oblique injection is typically observed. This scenario makes the wall temperature getting non-uniformly distributed with respect to the impinging point. In order to obtain the non-uniform temperature distributions, a metal plate with embedded heat flux probes was used as an impinging surface and experimental spray tests were conducted in a constant volume combustion chamber. Different injection pressures, ambient densities, and initial wall temperatures are evaluated to study the wall temperature changes and the location of the heat flux probes were adjusted to monitor the wall temperatures from near impinging point to far from impinging point regions. A correlation of wall temperature with distance to the impinging point is obtained.
- Citation
- Zhao, Z., and Lee, S., "An experimental study of heat loss and spatially temperature distributions of the impinging plate," SAE Technical Paper 2022-01-0607, 2022, .