There are three objective functions used here to evaluate the combustor performance, namely, the total pressure recovery coefficient, the drag coefficient, and the combustion efficiency
The combustion efficiency
, which is the ratio of the transferred heat to the energy input, is calculated for each steady-state measurement point.
Changes have also been made to the combustion chamber and the piston, all of which target improved combustion efficiency
. "One of the main causes of emissions is incomplete combustion," Ditter said.
During a hot-fire test of the engine's thrust chamber done in March, the engine showed a combustion efficiency
of 98.5 percent.
Increasing combustion efficiency
from 20% to 30%, for example, reduces [CO.sub.2] emissions by one third for the same amount of electricity.
It features a multi-zone fluidized bed that improves combustion efficiency
and reduces emissions.
Researchers have long sought to understand this process well enough to determine how best to minimize pollutant formation and increase combustion efficiency
refers to how completely the burner of a furnace or boiler converts fuel to useful heat.
This is a concern for combustion efficiency
, as in order to manage exhaust oxygen, the trapped air-fuel-ratio must be enriched to provide a stoichiometric feed-gas to the three-way catalyst.
Integration of O2 trim control ensures the highest achievable combustion efficiency
is maintained throughout the modulation range.
A numerical investigation of the influence of the metal particle redistribution in accordance with a metal mass fraction on the combustion efficiency
was carried out in paper  by assuming that the mass fraction of metal particles z(X) varies linearly along the channel.